High and Medium Resolution Satellite Imagery to Evaluate Late Holocene Human–Environment Interactions in Arid Lands: A Case Study from the Central Sahara
Abstract
:1. Introduction
The Central Sahara: Archaeology, Environment, and Remote Sensing
2. Materials and Methods
2.1. Study Area
2.2. Imagery Data
2.2.1. SRTM and ASTER DEM
2.2.2. Worldview 1–3
2.3. Delineation of Surface and Near-Surface Drainage Networks
2.4. Land Cover
2.4.1. Defining Land Cover Classes and Reference Data Collection
2.4.2. Random Forest (RF) Classifier
2.4.3. Accuracy Assessment
2.5. Anthropogenic Signatures in the Landscape
2.6. Statistical Analysis
3. Results
3.1. Hydrological Network
3.2. Land Cover Classification for the Extraction of Vegetation
3.2.1. Random Forest Parameters Setting
3.2.2. Vegetation and Other LULC Classification
3.2.3. Accuracy Assessment
3.3. Anthropogenic Features
3.4. Point Process Models
4. Discussion
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Abbreviations
RS | Remote Sensing |
GIS | Geographic Information Systems |
LULC | Land Use Land Cover |
NDVI | Normalized Difference Vegetation Index |
MLC | Maximum Likelihood Classifiers |
RF | Random Forest |
DEM | Digital Elevation Model |
CART | Classification and Regression Trees |
References
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WorldView-3 | WorldView-2 | WorldView-1 | |
---|---|---|---|
Date acquired | 25 October 2014 | 15 July 2013 | 9 May 2014 |
Panchromatic spatial resolution | 31 cm | 46 cm | 50 cm |
Swath Width at Nadir | 13.2 km | 16.4 km | 17.6 km |
Average Revisit Time | 1 day | 1.1 days | 1.7 days |
Spectral Bands | Pan + 8MS + 8 SWIR + CAVIS | Pan + 8MS | Pan |
Accuracy | 3.5 m CE90 | 3.5 m CE90 | 4 m CE90 |
Land Cover Class | Code | Training Dataset | Validation Dataset | Total |
---|---|---|---|---|
Woody vegetation (mainly Acacia trees) | WV | 104 | 45 | 149 |
Shrub | SH | 104 | 44 | 148 |
Crops | CR | 70 | 30 | 100 |
Water body | WB | 69 | 30 | 99 |
Sand dune | SD | 104 | 45 | 149 |
Rock | RK | 104 | 45 | 149 |
Shadow | SW | 102 | 44 | 146 |
Streams Count | Total Stream Length (km) | |
---|---|---|
ASTER (1000 cells stream network) | 2139 | 2804.330 |
SRTM (1000 cells stream network) | 1990 | 2742.050 |
HydroSHEDS (SRTM derived digital hydrological network) | 106 | 670.108 |
WV | CR | RK | SD | SH | SW | WB | Total | UA | |
---|---|---|---|---|---|---|---|---|---|
WV | 35 | 3 | 0 | 0 | 8 | 0 | 0 | 46 | 76.08 |
CR | 4 | 23 | 0 | 0 | 1 | 0 | 0 | 28 | 82.14 |
RK | 1 | 0 | 40 | 1 | 0 | 0 | 0 | 42 | 95.24 |
SD | 0 | 0 | 3 | 40 | 9 | 0 | 0 | 52 | 76.92 |
SH | 3 | 4 | 1 | 3 | 26 | 0 | 0 | 37 | 70.27 |
SW | 1 | 0 | 0 | 0 | 0 | 38 | 3 | 42 | 90.48 |
WB | 0 | 0 | 0 | 0 | 0 | 5 | 26 | 31 | 83.87 |
Total | 44 | 30 | 44 | 44 | 44 | 43 | 29 | 278 | |
PA | 79.55 | 76.67 | 90.91 | 90.91 | 59.09 | 88.37 | 89.66 | ||
OA | 82.01% | ||||||||
Kappa | 0.789 |
Approx. Chronology | N | |
---|---|---|
Complex Graves | Late/Final Pastoral (c. 3000–1000BC) | |
Antenna | 9 | |
Crater | 13 | |
Crater on platform | 2 | |
Crescent | 7 | |
Flat tumulus | 9 | |
Keyhole | 44 | |
Platform | 212 | |
Stone ring | 2 | |
Tumulus | 43 | |
Tumulus on platform | 190 | |
Tumulus with enclosure | 1 | |
Total complex graves | 532 | |
Simple Graves | Mostly historical (1000BC-AD700 ) | 5261 |
Ksur/Compounds | Historical to Islamic | 6 |
Enclosures | Late/Final Pastoral | 55 |
Stone Alignments | ? | 7 |
Contemporary Settlements | 534 | |
Uncertain | 633 |
AIC | Δ AIC | w | Pseudo-R2 | |
---|---|---|---|---|
Drainage × Vegetation × DEM | 75,583.03 | 0 | 1 | 0.2473 |
Drainage + Vegetation + DEM | 76,039.08 | 456.05 | <0.0001 | 0.2303 |
DEM | 77,814.92 | 2231.89 | <0.0001 | 0.1652 |
Drainage | 81,963.86 | 6380.83 | <0.0001 | 0.0135 |
Vegetation | 82,280.59 | 6697.56 | <0.0001 | 0.0019 |
Intercept only | 82,329.67 | 6746.64 | <0.0001 | NA |
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Biagetti, S.; Merlo, S.; Adam, E.; Lobo, A.; Conesa, F.C.; Knight, J.; Bekrani, H.; Crema, E.R.; Alcaina-Mateos, J.; Madella, M. High and Medium Resolution Satellite Imagery to Evaluate Late Holocene Human–Environment Interactions in Arid Lands: A Case Study from the Central Sahara. Remote Sens. 2017, 9, 351. https://doi.org/10.3390/rs9040351
Biagetti S, Merlo S, Adam E, Lobo A, Conesa FC, Knight J, Bekrani H, Crema ER, Alcaina-Mateos J, Madella M. High and Medium Resolution Satellite Imagery to Evaluate Late Holocene Human–Environment Interactions in Arid Lands: A Case Study from the Central Sahara. Remote Sensing. 2017; 9(4):351. https://doi.org/10.3390/rs9040351
Chicago/Turabian StyleBiagetti, Stefano, Stefania Merlo, Elhadi Adam, Augustin Lobo, Francesc C. Conesa, Jasper Knight, Hayette Bekrani, Enrico R. Crema, Jonas Alcaina-Mateos, and Marco Madella. 2017. "High and Medium Resolution Satellite Imagery to Evaluate Late Holocene Human–Environment Interactions in Arid Lands: A Case Study from the Central Sahara" Remote Sensing 9, no. 4: 351. https://doi.org/10.3390/rs9040351