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Article

Using 3D Spatial Visualisation to Interpret the Coverage of Anti-Aircraft Batteries on a World War II Battlefield

by
Dirk H.R. Spennemann
1,*,† and
Craig Poynter
2,*,†
1
Institute for Land, Water and Society, Charles Sturt University, P.O. Box 789, Albury, NSW 2640, Australia
2
Spatial Analysis Network, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Heritage 2019, 2(3), 2457-2479; https://doi.org/10.3390/heritage2030151
Submission received: 30 May 2019 / Revised: 9 August 2019 / Accepted: 20 August 2019 / Published: 26 August 2019
(This article belongs to the Section Architectural Heritage)
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Abstract

:
Heritage Building Information Modeling (HBIM) focuses on the documentation and visualization of heritage properties which are confined in their permanent terrestrial space. This paper extended the concept of Heritage Building Information Modeling to the airspace above the sites. It presented a methodology for the 3D spatial visualisation of the aerial space controlled by anti-aircraft (AA) guns, taking into account the masking effects of the underlying terrain and the technological capabilities of the guns (rate of fire, projectile weight, etc.). The tool permits a nuanced analysis of the interplay between attacking aircraft and the siting of anti-aircraft guns and thus, allows for the analysis of the cultural landscape of World War II-era battle fields, which has to take into account the influence of aerial warfare. The applicability was illustrated by the case example of the Japanese WWII base on Kiska (Aleutian Islands).

1. Introduction

Technological advances in digital recording techniques combined with sophisticated visualization techniques allow for complex Heritage Building Information Modeling (HBIM). HBIM focusses on the digital documentation and visualization of heritage properties, allowing practitioners to document extant structures [1] to visualize interior architectural elements [2] and identify structural commonalities between different buildings [3], to visualize past known states of an extant structure [4,5], to visualize no longer extant structures and sites [6], to run structural simulations [7], to plan for conservation actions [8,9], including recovery from natural disasters [10,11,12], and to facilitate virtual tours of sites [13]. Consequently, HBIM has proven to be a powerful tool for cultural heritage managers.
Common to all approaches is that the site under consideration is confined in and constrained by its permanent terrestrial space. This paper extended the concept of Heritage Building Information Modeling to the airspace above the documented sites. The aim of this paper was to present a methodology for the 3D spatial visualization of the aerial space controlled by anti-aircraft (AA) guns. This is aerial space, in effect an ephemeral site, which is created when the guns are fired, but is otherwise non-existent.
This visualization was required in a hind-casting analysis of decisions made by a battlefield commander during World War II. The existing models, representing the AA fire as simple domes, were too inaccurate, as they did not take into account the masking effects of the underlying terrain, nor did they consider the technological capabilities of the guns (rate of fire, projectile weight, etc.). The matter is further complicated by the deep structuring of AA defenses with guns of different calibers.
Rather than building a task-specific application for just this project, the approach taken here was to draw on a widely available commercial program, Esri ArcGIS 10.0, and to develop a methodology that allowed the modelling of a range of spatial patterns of gun positioning. As the performance data of, in this case, Japanese AA weapons are standardized, this methodology now permits the examination other battle fields in a similar fashion.

2. The Problem

A recent assessment of the cultural landscape of the World War II battlefield of Kiska (Aleutian Islands, Alaska) examined the extent to which the extant heritage items and sites represented the various phases of the Battle for Kiska and made recommendations on how the cultural landscape should be managed [14]. Prior fieldwork on Kiska had shown the presence of a wealth of World War II material culture and landscape features, all in an excellent state of preservation [15,16].
In the historic preservation setting, the analysis of a historic battlefield requires hindcasting a battle commander’s view of the battlefield in the hopes of being able to reconcile the physical remains encountered on the actual battlefield with the historic accounts of the battle. Geographical features which represent obstacles or allow for fields of fire and concealment of approach or withdrawal, etc., must be examined in the light of the military doctrine of the day, as well as in the light of the then-available technology. In an ideal world, this approach would allow (a) a better interpretation of the battlefield to an audience; and (b) the identification of aspects of the battlefield that may not have seen the level of management attention they deserve.
These approaches have been successfully implemented in Geographical Information Systems (GIS) to analyze historic battlefields and manifestation in the cultural landscape they created and in which they are embedded [17,18,19,20].
However, all battles analyzed to date were terrestrial battles only. All the battles of the War of Independence, the Civil War, and the Indian Wars were land warfare, pure and simple, on occasion augmented by naval action bombarding shore installations.
The battle for Kiska is a situation in which an opposing force held an island, but where no actual person-to-person ground combat occurred. As all enemy contact occurred through aerial warfare, some adjustments to the methodology were required. Thus, 3D spatial modeling was drawn on to provide solutions.

3. Background of Kiska and Its WWII History

Kiska is an approximately 30-mile long and 7-mile wide volcanic island of the Rat Island group of the Aleutian Chain, located approximately 1450 miles west of Anchorage (Figure 1). Uninhabited since the 1830s, the island was occasionally visited on a seasonal basis for fur hunting (foxes, sea otters). By 1941, the U.S. Navy operated a small weather station at Kiska Harbor.
As part of the overall Battle of Midway operation, Japanese forces occupied Kiska on 6 June 1942 and nearby Attu the following day. While the main objective to establish a base on Midway failed, the Aleutian component was a success [21]. In the subsequent months, the Japanese developed Kiska into a base from which to mount seaplane and submarine operations in the Northern Pacific. The base, which, at the height of development saw over 5000 Navy and Army troops stationed there, was well defended by an array of coastal defense and anti-aircraft (AA) guns. The U.S. attempted, in vain, to dislodge the Japanese by long-range aerial bombardment [22], which was hampered by bad visibility of the target and adverse flying conditions. With the U.S. forces successfully recapturing Attu on 30 May 1943, the Kiska garrison became unsustainable, as the island was isolated and could only be supplied by submarines. As an American and Canadian force of more than 34,000 men prepared to invade Kiska, a Japanese evacuation fleet managed to slip through the fog, board the 5100 troops in less than one hour and escape without being detected [14].
When the U.S./Canadian assault occurred three weeks later, they found the island deserted. To deny the Japanese the future use of the island, the U.S. established their own garrison there, which operated in increasingly scaled-down size until the end of the Pacific War [14].
Kiska forms a unique cultural landscape because with the exception of a few prehistoric indigenous Aleut sites, the island represents a battlefield pure and simple. When the Japanese evacuated the island, they had to leave all their major equipment behind. All of this, as well as personnel shelters and revetments for barracks, is still in situ, except where the U.S. and Canadian garrison forces had competing land use (and cleared the debris) or where U.S. intelligence removed some equipment for testing. In addition to the Japanese component, the battle field encompasses evidence of the U.S. bombing, wrecks of U.S. aircraft shot down, as well as evidence of the U.S. base development, including an airfield (which had been started by the Japanese), piers, collapsed Quonset huts, and the like [14,15,16,23].

3.1. The Role of Anti-Aircraft Fire

The World War II history of Kiska can be broken up into six phases: (i) Preparing for War; (ii) Attack Phase; (iii) Occupation Period; (iv) Retaking Phase; (v) Garrisoning; and (vi) Abandonment [14]. Kiska was not a single decisive battle, but a prolonged 14-months engagement of trying, by means of air attacks, to dislodge the Japanese after they had gained their foothold. As the 1944 U.S. Intelligence Assessment noted, “[t]he fourteen-month battle for Kiska was largely an engagement between the Eleventh Air Force and Japanese AA fire” [24]. For the analysis of the AA, we only need to be concerned with phases II (Attack) and III (Occupation).
U.S. bombing commenced on 10 June 1942, as soon as the presence of the Japanese on Kiska had been discovered. The first bombing runs were carried out from Cold Bay via Umnak, necessitating long distance flights which were hard on the crews and the aircraft. Over time, U.S. forces built a range of airfields ever closer to Kiska. U.S. bombing runs on Kiska had to be carried out by B-17 and B-24 heavy bombers, dropping their loads from medium to high altitude. While fighter escorts to suppress Japanese AA fire were possible once the base on Adak was operational, this was not very effective, as fighters operated near the end of their range. This changed in February 1942, with the opening of an airfield on nearby Amchitka. Not only could fighters routinely accompany the bombers, but the U.S. could also use medium bomber for medium- and low-altitude attacks. In the final phase of the battle, ironically after the Japanese had already abandoned Kiska, the U.S. used dive-bombers for high precision bombing of specific targets (mainly gun installations).
From the Japanese defenders’ perspective, the changing U.S. attack strategies required an adaptation of their responses. These were primarily the development and positioning of the AA and the deployment of the fighter aircraft. While the sea-plane base had been developed for Kawanishi H6K (‘Mavis’), Aichi D13A1 (‘Jake’) and Mitsubishi F2M1 (‘Pete’) long- and medium-range reconnaissance planes, the Japanese responded to the developing threat by U.S. bombers with the deployment of Nakajima A6M2-N (‘Rufe’) floatplane fighters, a brand-new floatplane adaptation of the ‘Zero’ fighter, which had just become available in small numbers [14,25].

3.2. Problems in Interpreting Anti-Aircraft Fire

When examining the interactions between attacking aircraft and opposing anti-aircraft fire, we can work from the known entity, the location of the AA gun batteries. It seems more sensible to provide data on the practical rate of fire rather than the theoretical maximum. This takes into account the number of barrels as well. Furthermore, the effective ceiling where hits could be expected, is given, rather than the maximum ceiling. On Kiska, these were mapped during World War II on the bomb target maps, and have since been verified in the field during surveys carried out in 2007 and 2009 [14,15].
The principal Japanese AA gun types are summarized in Table 1. The key weapons in the early part of the battle were 25-mm twin-barreled medium AA, 75-mm Type 88 heavy AA (Figure 2), and 120-mm dual-purpose guns. The latter also served as surface weapons against naval targets. Once fighters came into play, smaller calibers, notably the 13.2-mm Type 93, were used. These, however, were also subject to direct strafing fire by attacking aircrafts and their effectiveness seems to have been low.
The Japanese sited their AA weapons in order to protect their key assets at Kiska Harbor, initially the sea-plane base at the north-western beach and soon after, the submarine base on the south-western shore. A range of AA weapons was emplaced, each with different capabilities (Table 1), to provide an in-depth defense. As is evident from the above, this system of AA was not static, but responsive to changes in U.S. tactics. To adequately analyze this defense system, GIS was drawn on to visualize the capabilities of the guns in a three-dimensional space.

4. GIS in Cultural Resources Management

Geographic Information Systems have seen a wide range of applications in the field of Cultural Resources Management, in particular archaeology [31], distribution mapping [32], predictive modeling of site presence [33] and threats to sites posed by a range of hazards [34,35], as well as in general cultural asset and information management [36,37,38]. It has been used to interpret layering in cultural landscapes [39,40], including battlefield landscapes [20,41,42,43,44] and has been successfully used in the analysis of battlefields and the hindcasting of commanders’ decisions [45,46,47,48]. Most of the CRM approaches taken were predictive modeling of site location or bringing together a plethora of historic and spatial data that could be queried on a geo-spatial scale [49,50].
The past decade has seen 3D visualization become a common approach in heritage research, in particular with regard to the reconstruction of historic buildings from plans or archaeological observations [51] and the resulting ‘walk-throughs’ and virtual surrounds [52], as well as reconstruction built environments, such as medieval villages [53].
Drawing on virtual reality games engines, research on 3D modelling of a historic terrestrial battlefield has been carried out by Darlington [54]. Other current avenues of research are looking into the recreation and simulation of battles [49].
The specific problem posed by the case of Kiska is not one of predictive modeling or geo-spatial querying, nor the mere reconstruction of former buildings, but one that would create and superimpose, on a terrain model, a 3D environment of AA fire that could then be rotated and investigated from the various viewpoints to emulate the attacker and the defender alike.

5. Visualisation and Modelling

With the release of Esri ArcGIS 10.0, a new suite of 3D spatial tools became available, primarily the ‘skyline’ and ‘skyline barrier’ toolsets. These tools have so far not been applied to a cultural resource management situation. For the specific case under discussions, these tools provided an opportunity to analyze and visualize the extents to which AA gun emplacements could target an attacking aircraft. An instructional method for performing analysis of threats posed by AA guns was provided by Esri to outline the functions of the 3D tools [55], but the models representing AA guns are too simplistic and do not reflect the technical specifications of individual AA guns. The methodology discussed here is a novel approach.

5.1. Datasets

Due to the location of the survey site, limited spatial datasets exist. In order to conduct our analysis, an extensive search of on-line spatial databases was undertaken to identify available spatial datasets. As a basis to conduct our analysis, two spatial datasets were required: a Kiska Island elevation model and the point locations of AA gun emplacements surveyed on Kiska Island. All other spatial datasets involved in the analysis were derivative products of these initial datasets.
The ASTER Global DEM version 1 was sourced for the elevation model for Kiska Island. The ASTER Global Digital Elevation Model (ASTER GDEM) is a joint product developed made available to the public by the Ministry of Economy, Trade, and Industry (METI) of Japan and the United States National Aeronautics and Space Administration (NASA). It was generated from data collected from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), a satellite-based Earth-observing optical instrument. It has an along-track stereoscopic capability using its near infrared spectral band and nadir-viewing and backward-viewing telescopes to acquire stereo image data with a base-to-height ratio of 0.6. The spatial resolution is 15 m in the horizontal plane. One nadir-looking ASTER VNIR scene consists of 4100 samples by 4200 lines, corresponding to about a 60-km-by-60-km ground area [56].
The ASTER GDEM covers land surfaces between 83° N and 83° S and is composed of 22,600 1°-by-1° tiles. Tiles that contained at least 0.01% land area were included. The ASTER GDEM is in GeoTIFF format with geographic lat/long coordinates and a 1 arc-second (30 m) grid of elevation postings. It is referenced to the WGS84/EGM96 geoid. Pre-production estimated accuracies for this global product were 20 m at 95% confidence for vertical data and 30 m at 95 % confidence for horizontal data.
Locations of gun emplacements were identified on World War II era bomb-target maps prepared by the U.S. Air Force [57] which were geo-referenced using Google Earth imagery (Figure 3). These locations are not positionally accurate (to within approximately 10 m), but provided the approximate center of each established gun emplacement as it existed.

5.2. AA Technical Data

The technical specifications of the surveyed gun types were utilized to form the basis of 3D models of the range and elevation of AA guns utilized in the defense of Kiska Island. The required technical data for the altitude and radius of the AA fire at different elevations (‘fire dome’) were drawn from intelligence sources. The 25 mm, 75 mm and 120 mm detailed fire domes had been compiled by U.S. sources based on data contained in Japanese documents as well as tests carried out by U.S. forces with captured equipment [27] (Table 2). No such data existed for the 13.2 mm AA, but an approximate dome could be constructed drawing on dispersed intelligence commentary. To permit the construction of required spatial features within the GIS, the data were converted from feet and yards to meters.

5.3. Concepts

In the instructional methodology proposed by Esri of using the ‘skyline’ and ‘skyline barrier’ tools, features representing AA gun trajectories within Esri’s ArcScene were created using 3D spherical symbology elements. These representations were then converted using a series of tools to make ‘multi-patch’ features (e.g., 3D models) for further analysis. The hemispheres created were a simple representation of trajectories but did not reflect the real-world technical specifications required to understand the placement of AA guns in a combat situation.
Utilizing initial range and altitude specifications of AA guns used in the defense of Kiska Island by the Japanese, a representation of gun trajectories was created in the form of domes, based on the range and altitude of the AA guns. The technical specifications of individual AA guns, specifically the angles of depression and elevation, had to be considered, as the Japanese AA guns had a maximum elevation of 85° and thus could not fire directly overhead. In consequence, domes with depressed centers had to be created. These features, although basic, provide an indication of the extent of the defensive coverage provided by AA gun emplacements on Kiska Island.
Initial wire-frame models of the Japanese AA were produced in 2010, which showed fire domes placed on the centroids of the gun batteries. While these allowed examination and visualization of the AA in general terms (Figure 4) and were drawn on in the landscape study [14], they did not take into account the actual number of gun barrels emplaced, nor the rate of fire. To examine this in this in more depth, revised AA fire domes were generated.

5.4. Current Approach

The revised AA fire domes were generated using an adapted methodology as proposed by Esri, incorporating the depressed gun elevations and the subsequent multi-patch features. To this were added attributes for weight of ammunition (Kg), sustained rate of fire (SROF), number of guns in emplacement (NoG), and combined flak from emplacement calculated (Kg × SROF × NoG), which enabled an estimate of flak concentration in a 3D space.
The overall estimate of flak concentration comprised four discrete workflows with all workflows having a range of iterations based on the required variations to input settings, thereby generating a series of discrete outputs. These outputs then formed the input for the next workflow, with the last set output combined to achieve the final representation (Figure 5).
There are two main phases in the process: the creation of fire domes for each of the gun locations (Phase 1) and the integration of the fire domes of selected gun positions to generate an estimate of flak concentration in a 3D space (Phase 2). This approach allows the user to modify the research query by selecting a different group of gun positions (based on historic information or other reasoning) and merely rerunning the steps required for phase 2. The fire dome models of phase 1 can be generated for an actual gun emplacement known from either historic sources or observed during actual field survey, or for a hypothetical location, the effect of which to the overall flak coverage is to be investigated.
Phase 1: The initial step was to generate a model of the airspace for each gun emplacement that could be targeted by the gun (Figure 6 and Figure 7). These outputs form the primary data set for further analysis. The actual elevation, as derived from the ASTER GDEM, was used for all terrestrial emplacements. For the assessment of ship-borne AA, the approximate location of the ship was determined using historical imagery with the elevation of the gun set at 5 m above sea-level. In the next step, sampled fire dome features were calculated for the gun emplacements selected for analysis (Figure 8 and Figure 9). These now form the foundations for all future analyses of the effects of the flak.
Phase 2: Following the selection of the AA positions to be used in the flak analysis, the combined flak representation was calculated for an individual elevation for a grid point (Figure 10 and Figure 11), which were then integrated to provide the targeted flak area at a sampled elevation (Figure 12). When these were combined, an estimate of the total flak concentration in a 3D space could be generated (Figure 5).

6. Results

The operational commander on the ground had years of technical military training and could readily visualize the situation as it presented itself to him in 1942; the modern-day researcher, however, is not intuitively cognizant of the capabilities and limitations of the Japanese AA systems in a given setting—a problem that influences the ability to hind-cast the Japanese operational commander’s decisions.
The resulting three-dimensional models clearly show that the AA coverage during the initial occupation phase was insufficient to properly protect the Japanese base and associated shipping in the Harbor (Figure 13). While the AA in the main valley provided a protective dome over part of the harbor, including its approaches, it could be readily circumnavigated. Large sections of the base area were not under a protective umbrella and thus vulnerable to attack. Moreover, the total number of guns, and thus, the intensity of AA fire that could be projected, was limited. Some of the U.S. approach routes were additionally shielded from AA fire due to hills. This situation was exploited by a U.S. aircraft, which attacked shipping to prevent more supplies from being landed.
At the same time, the presence of Japanese warships in the harbor during the initial occupation phase provided additional platforms for AA. While this proved successful in shooting down a U.S. aircraft [14], it also put the same ships at risk, as they were priority targets for the U.S. attackers [14]. Japanese doctrine favored that such vessels provide convoy protection and not floating AA platforms. Thus, their presence at Kiska was always time limited. In mid-June, the arrival of some of the transports from the Midway Convoy brought additional AA weapons which could be effectively deployed to provide a defensive umbrella (Figure 14). Thus, the entire harbor area was covered.
The AA umbrella could be expanded and deepened with the arrival of the IJA troops from Attu in mid-September 1942, who brought additional 75-mm AA batteries (Figure 15), adding to the intensity over the harbor, but also adding depth to the south and west.
The static images of the AA domes as represented in Figure 14, Figure 15, Figure 16 and Figure 17, show sample images of, what are, of course, rotational models that can be queried from all angles, as well as vertical view points, thus emulating the altitude the U.S. pilots might have flown. Moreover, subsets of these images could be developed that show only individual calibers (Figure 16 and Figure 17)—a suitable tool to investigate the contribution each gun type made to the whole.
The 3D spatial visualization developed for Kiska represents ideal conditions, however, as it does not consider the effect of cloud cover, which was a major limiting factor encountered by U.S. aircrews, with the Aleutian Chain experiencing broken to overcast conditions for more than 90% of the time [60]. Moreover, while the 3D spatial visualization allowed for a dispassionate forensic analysis of the pros and cons of siting AA positions at a given terrain location, and thus their relative chances of success in warding off an impending attack, such visualization cannot factor in human psychology in the heat of battle and whether AA guns actually fired at the reputed sustained rate of fire.

7. Implications

The 3D spatial visualization of the Japanese AA, as described in this paper, provided a tool that could be successfully queried to examine both the development of the Japanese AA and the contributions made by the individual AA gun types and batteries, and thus, significantly contributed the understanding of the historic conditions [61,62]. The ability to not only rotate the landscape model trough all degrees of the compass, but also change the elevation of observation allows for detailed analysis. Of particular advantage was the ability to both simulate known flight /attack routes and query to what degree they would have been exposed to AA fire.
In an ‘ideal’ world, the system would allow, in real time, for each gun to be individually turned ‘on’ or ‘off’ and would also permit the resistance of a gun by simply dragging it to another location and instantly examining the effect this has on the overall defensive umbrella. The computational reality, however, is that each image has to be re-calculated and re-rendered, a process that relies on the resolution of data sampling. The images presented within this paper typically required 12–14 h processing, as they were sampled at 50 m horizontal and 100 m vertical spacing covering and area of 808 km2 to an altitude of 9200 m.
The implications for heritage management are three-fold: the ability to three-dimensionally render the overlap of firing cones of anti-aircraft guns allows us to visualise a Japanese commander’s mind map of the defensive umbrella provided by such guns. It also allows us to hindcast command decisions regarding the siting of these guns, in particular whether they were in keeping with, or were deviating from Japanese military doctrine. Finally, such three-dimensional rendering allows us to assess the relative contribution each gun would have made to the overall defensive effort. Combined with chronological data on the arrival of additional anti-aircraft guns (originally destined for Midway), this knowledge allows us to understand the development of the Japanese defences over time, as well as any modifications as reaction to the U. S. bombing strategy.

Author Contributions

Conceptualization, D.H.R.S. methodology, D.H.R.S.; C.P. investigation, D.H.R.S. software, C.P. visualization, C.P. formal analysis, D.H.R.S. writing—original draft preparation, D.H.R.S.; CP. writing—review and editing, D.H.R.S.

Funding

The fieldwork on Kiska (D.H.R.S.) was funded through a battlefield grant by the US National Park Service and logistically supported by the Alaska Maritime National Wildlife Refuge.

Acknowledgments

The authors are indebted to Andrew Hall and Rachel Whitsed (both CSU) for comments on an earlier draft of this paper. The ongoing support by Janet Clemens (US NPS) is gratefully acknowledged.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Location of Kiska.
Figure 1. Location of Kiska.
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Figure 2. Example of a 75-mm Type 88 anti-aircraft (AA) gun at North Head, Kiska Harbor.
Figure 2. Example of a 75-mm Type 88 anti-aircraft (AA) gun at North Head, Kiska Harbor.
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Figure 3. Section of the U.S. Army bomb target map 28 July 1943 of North Head, Kiska, showing the location of a 120-mm DP Battery (target n° 202) [58].
Figure 3. Section of the U.S. Army bomb target map 28 July 1943 of North Head, Kiska, showing the location of a 120-mm DP Battery (target n° 202) [58].
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Figure 4. Initial wire frame model of the Japanese AA developed in 2010 (published in Spennemann 2011). The 25-mm Type 96 medium anti-aircraft guns at Mercy Point (red) and the 75-mm AA to the west of the Main Camp area, showing the stratified structure the AA.
Figure 4. Initial wire frame model of the Japanese AA developed in 2010 (published in Spennemann 2011). The 25-mm Type 96 medium anti-aircraft guns at Mercy Point (red) and the 75-mm AA to the west of the Main Camp area, showing the stratified structure the AA.
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Figure 5. Workflow to generate a 3D visualization of integrated flak coverage on terrain. Overview and iterations.
Figure 5. Workflow to generate a 3D visualization of integrated flak coverage on terrain. Overview and iterations.
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Figure 6. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 1 (top): Generating the model of airspace targeted by a gun emplacement. Notes: [1] calibre, ammunition weight (Kg), sustained rate of fire (SROF), number of guns in emplacement (NoG), and combined flak per gun emplacement (CombDmg = Kg × SROF × NoG)—[2] Units entered need to be doubled to produce representative feature.
Figure 6. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 1 (top): Generating the model of airspace targeted by a gun emplacement. Notes: [1] calibre, ammunition weight (Kg), sustained rate of fire (SROF), number of guns in emplacement (NoG), and combined flak per gun emplacement (CombDmg = Kg × SROF × NoG)—[2] Units entered need to be doubled to produce representative feature.
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Figure 7. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 1 (bottom): Generating the model of airspace targeted by a gun emplacement. Notes: [1] This outputs the depressed area directly above gun emplacements in which firing cannot take place [2]. Adjustment allows the inverted cone and output of step 6 to not intersect.
Figure 7. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 1 (bottom): Generating the model of airspace targeted by a gun emplacement. Notes: [1] This outputs the depressed area directly above gun emplacements in which firing cannot take place [2]. Adjustment allows the inverted cone and output of step 6 to not intersect.
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Figure 8. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 2 (top): Generating sampled fire dome features for a gun emplacement.
Figure 8. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 2 (top): Generating sampled fire dome features for a gun emplacement.
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Figure 9. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 2 (bottom): Generating sampled fire dome features for a gun emplacement.
Figure 9. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 2 (bottom): Generating sampled fire dome features for a gun emplacement.
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Figure 10. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 3 (top): Generating the combined flak representation at an individual elevation for a grid point. Note: [1] Selection performed by alphabetical letter iteration, due to the large quantity of sampling points generated by specified sampling regime. Trying to sample entire sample space at one time may lead to computational resources diminishing, disabling the analysis process.
Figure 10. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 3 (top): Generating the combined flak representation at an individual elevation for a grid point. Note: [1] Selection performed by alphabetical letter iteration, due to the large quantity of sampling points generated by specified sampling regime. Trying to sample entire sample space at one time may lead to computational resources diminishing, disabling the analysis process.
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Figure 11. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 3 (bottom): Generating the combined flak representation at an individual elevation for a grid point.
Figure 11. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 3 (bottom): Generating the combined flak representation at an individual elevation for a grid point.
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Figure 12. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 4: Generating the targeted flak area at a sampled elevation.
Figure 12. Workflow to generate a 3D visualization of integrated flak coverage. Work Flow 4: Generating the targeted flak area at a sampled elevation.
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Figure 13. Extent of Japanese AA cover over Kiska soon after occupation, showing the extent to which at least 1/2 ton of shell per minute could be brought to bear. Note the central inverted cone caused by the fact that the AA had a maximum elevation of 85° (view from Southeast).
Figure 13. Extent of Japanese AA cover over Kiska soon after occupation, showing the extent to which at least 1/2 ton of shell per minute could be brought to bear. Note the central inverted cone caused by the fact that the AA had a maximum elevation of 85° (view from Southeast).
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Figure 14. Extent of Japanese AA cover over Kiska after the arrival of the Midway materiel, showing the extent to which at least 1 ton of shell per minute could be brought to bear. Note the central inverted cone caused by the fact that the AA had a maximum elevation of 85° (view from Southeast).
Figure 14. Extent of Japanese AA cover over Kiska after the arrival of the Midway materiel, showing the extent to which at least 1 ton of shell per minute could be brought to bear. Note the central inverted cone caused by the fact that the AA had a maximum elevation of 85° (view from Southeast).
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Figure 15. Extent of Japanese AA cover over Kiska at height of development. Total medium and heavy AA (25 mm, 75 mm and 120 mm), showing the extent to which at least 1 ton of shell per minute could be brought to bear. Note that deep structuring the AA removed the central inverted cone (view from Southeast).
Figure 15. Extent of Japanese AA cover over Kiska at height of development. Total medium and heavy AA (25 mm, 75 mm and 120 mm), showing the extent to which at least 1 ton of shell per minute could be brought to bear. Note that deep structuring the AA removed the central inverted cone (view from Southeast).
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Figure 16. Contribution to Japanese AA cover over Kiska by individual calibers. Total 25-mm AA showing the maximum contribution of shell (119 kg/minute) that could be brought to bear (view from northeast).
Figure 16. Contribution to Japanese AA cover over Kiska by individual calibers. Total 25-mm AA showing the maximum contribution of shell (119 kg/minute) that could be brought to bear (view from northeast).
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Figure 17. Contribution to Japanese AA cover over Kiska by individual calibres. Total 75-mm AA, showing the extent to which at least 1 ton of shell/minute could be brought to bear (view from northeast).
Figure 17. Contribution to Japanese AA cover over Kiska by individual calibres. Total 75-mm AA, showing the extent to which at least 1 ton of shell/minute could be brought to bear (view from northeast).
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Table
Table 1. Technical overview of the capabilities of the AA on Kiska.
Table 1. Technical overview of the capabilities of the AA on Kiska.
CaliberModelMountMobile?n° Depression/ElevationEffective Rate of Fire (Rounds/Min)Effective Ceiling (ft)Maximum Ceiling (ft)Weight of Round (kg)
13.2 mm Type 93single yes4−5°/85°~25010,00014,7000.05
13.2 mm Type 93twinyes14−5°/85°~50010,00014,7000.05
20 mm Type 98single yes15−5°/85°~120500011,5000.14
25 mm Type 96twinno10−10°/85°~220980018,0000.27
75 mmType 88single yes220°/85°17–2016,40035,8006.53
120 mm10th yearsingle no4−5°/85°6–822,90033,00020.73
Data sources [26,27,28,29]. Quantity of guns encountered on Kiska after enumeration in Payne [30].
Table
Table 2. Range of fire at elevation of the principal AA on Kiska (altitude in feet, radius in yards).
Table 2. Range of fire at elevation of the principal AA on Kiska (altitude in feet, radius in yards).
25 mm75 mm120 mm
AltitudeRadiusAltitudeRadiusAltitudeRadius
03650012,100016,600
20003600500011,710500015,800
4000340010,00011,10010,00014,700
6000305015,00010,09015,00013,400
8000250020,000858020,00011,850
10,000150025,000607025,0009850
30,0007300
Data for 25 mm, 75 mm and 120 mm after [27]; Fire dome for 13.2 mm after [29]. This source provides a maximum range of 6300 yards (18,900 ft) and a maximum ceiling of 14,700 ft. Japanese documents state that the 13.2 mm guns should not be used against targets above 3000 m (10,000 ft) unless the situation was deemed ‘very profitable.’ [59].

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Spennemann, D.H.R.; Poynter, C. Using 3D Spatial Visualisation to Interpret the Coverage of Anti-Aircraft Batteries on a World War II Battlefield. Heritage 2019, 2, 2457-2479. https://doi.org/10.3390/heritage2030151

AMA Style

Spennemann DHR, Poynter C. Using 3D Spatial Visualisation to Interpret the Coverage of Anti-Aircraft Batteries on a World War II Battlefield. Heritage. 2019; 2(3):2457-2479. https://doi.org/10.3390/heritage2030151

Chicago/Turabian Style

Spennemann, Dirk H.R., and Craig Poynter. 2019. "Using 3D Spatial Visualisation to Interpret the Coverage of Anti-Aircraft Batteries on a World War II Battlefield" Heritage 2, no. 3: 2457-2479. https://doi.org/10.3390/heritage2030151

APA Style

Spennemann, D. H. R., & Poynter, C. (2019). Using 3D Spatial Visualisation to Interpret the Coverage of Anti-Aircraft Batteries on a World War II Battlefield. Heritage, 2(3), 2457-2479. https://doi.org/10.3390/heritage2030151

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