Remote Sensing & GIS Applications in Urban Science

Urban rooftop photovoltaic systems represent a substantial yet still underutilized renewable energy resource, particularly in high-density residential environments. Accurate large-scale assessment of rooftop solar potential, however, remains challenging due to the complex geometry of urban morphology and the limited availability of high-resolution geospatial data. This study presents a large-scale methodological framework for estimating the theoretical photovoltaic potential of urban rooftop spaces using Unmanned Aerial System (UAS)-based digital photogrammetry and GIS-based spatial analysis. The approach integrates centimeter-resolution Digital Surface Models (DSMs) and orthophotos derived from fixed-wing UAS surveys with detailed rooftop vectorization and solar radiation modeling implemented in a GIS environment. The methodology accounts for rooftop geometry, surface orientation, slope, shading effects, and rooftop-mounted obstacles. The methodology consists of data collection of high-resolution RGB imagery suitable for detailed three-dimensional reconstruction. The images are captured with a UAS equipped with a S.O.D.A. 3D photogrammetric camera, creating a dense, georeferenced three-dimensional point cloud based on UAS imagery. Based on the point cloud, a high-resolution Digital Surface Model (DSM) was produced. Rooftop boundaries and rooftop-mounted structures were digitized on the basis of an orthophoto created from UAS imagery. The analysis workflow consists of solar modeling using ArcGIS Pro, including calculating the solar radiation. The next methodological step is to filter low radiation rooftops, steep slopes, and northern-oriented rooftops. Finally, we calculate the potential electricity production. The framework was applied to high-density residential districts in Sofia, Bulgaria, dominated by prefabricated panel buildings with predominantly flat rooftops. Drone applications in such studies are typically restricted to modeling individual roofs, which severely limits their scalability for district-wide evaluations. To overcome this, the study employs a specialized fixed-wing UAS uniquely certified for legal operations over densely populated urban environments. This platform rapidly maps large territories, ensuring consistent lighting and shading conditions that significantly enhance the accuracy of subsequent rooftop digitization. Furthermore, the resulting centimeter-level precision enables the exact vectorization of micro-rooftop obstacles. Capturing these intricate details is a critical innovation that effectively prevents the overestimation of solar energy potential commonly observed in conventional large-scale models. Solar radiation was modeled at the pixel level for a full annual cycle and filtered using photovoltaic suitability criteria, including minimum annual radiation thresholds, slope, and aspect constraints. Theoretical electricity production was subsequently estimated using zonal statistics and system performance parameters representative of contemporary photovoltaic installations. The results indicate a total theoretical annual electricity potential of approximately 76.7 GWh for the analyzed rooftop spaces, with an average production of about 34 MWh per rooftop and pronounced spatial variability driven by rooftop geometry and exposure conditions. The findings demonstrate the significant renewable energy potential embedded in existing urban rooftop infrastructure and highlight the applicability of UAS-based photogrammetry for high-resolution, large-area solar potential assessments. The proposed framework provides actionable information for urban energy planning, municipal solar cadaster development, and the strategic integration of photovoltaic systems into dense urban environments, particularly in regions lacking open-access high-resolution geospatial datasets. Full article

Urban Heat Island (UHIs) are becoming increasingly extensive in tropical megacities, highlighting the need for efficient Blue-Green Infrastructure (BGI) to control surface temperatures and enhance urban climate resilience in Kuala Lumpur. Therefore, this study estimates BGI in Kuala Lumpur’s five parks using Landsat for monthly temperatures from 2014 to July 2025 and geospatial indices and ECOSTRESS-based temperatures from June to July 2025 for the urban park cooling intensity (UPCI). Bukit Jalil Recreational Park (BJRP) and Permaisuri Lake Garden (PLG) demonstrated the strongest synergy between vegetation and moisture, with the median land surface temperature (LST) (31.1 °C to 31.4 °C), the highest vegetation index (>0.26), moisture index (~0.27), and significant negative correlations with LST (r ≈ −0.6). Due to built-up and nighttime light, Kuala Lumpur City Centre Park (KLCCCP) recorded an LST exceeding 36 °C, low vegetation (0.18), and average moisture levels (0.17). Parks with water features, like Botanical Garden and Taman Tasik Titiwangsa (TTT), had LSTs 4 °C to 6 °C lower than adjacent built-up. According to UPCI, KLCCP recorded the highest cooling at 300 to 400 m (−0.92 °C), while BJRP experienced warming, with the UPCI increasing to +0.57 °C. Patch density analysis indicated that less fragmented, moisture-rich vegetation provides better cooling. These analyses suggest global transferable climate warming for tropical megacities and discuss how integrated BGI may propose practical, data-driven urban planning and climate-responsive redesign methods to decrease UHI and enhance climate resilience. Full article