Solar site selection using GIS and remote sensing.

Solar site screening inputs

A solar site needs more than open land. The first pass should combine energy potential, constructability, access, grid context, land-use constraints and environmental risk.

• Candidate parcels, boundaries, land banks or search areas
• Solar irradiance, cloud frequency and seasonal sunlight context
• DEM-based slope, aspect, elevation and terrain roughness
• Land use land cover, vegetation, water bodies and settlement proximity
• Floodplains, drainage channels, ponding-prone zones and surface-water history
• Road access, construction logistics, substations and transmission-line proximity
• Protected areas, forests, wetlands, environmental sensitivity and exclusion zones

Solar suitability methods

Solar site selection GIS works best when hard exclusions are separated from weighted preferences. A site can be sunny but still weak because of slope, flooding, land conflict, access, permitting risk or grid distance.

• Irradiance screening: compare long-term solar resource, GHI, ERA5 SSRD, cloud patterns and seasonal reliability.
• Slope and aspect analysis: identify flatter areas, steep slopes, pole-facing orientation issues and grading constraints from DEM data.
• Land cover classification: distinguish barren land, cropland, forest, settlement, water, scrub and built-up areas using satellite imagery.
• Boolean exclusion masks: remove protected areas, water, urban land, steep slopes, unsuitable aspect and other non-buildable locations before ranking.
• Vegetation and clearing review: use NDVI and time-series imagery to estimate vegetation density and seasonal clearing implications.
• Flood and drainage screening: map drainage paths, flow accumulation, flood-prone areas, surface water and waterlogging indicators.
• Access and logistics analysis: evaluate distance to roads, tracks, settlements, construction access and route constraints.
• Grid proximity analysis: map distance to substations, transmission lines and corridors where reliable data is available.
• Environmental constraint overlay: screen protected areas, wetlands, water bodies, forest, habitat-sensitive zones and land-use conflicts.
• AHP-MCDM solar scoring: combine exclusions, weighted criteria, consistency checks and confidence notes into ranked solar site suitability classes.
• Suitability index mapping: classify candidate polygons by technical, environmental, economic and grid-integration suitability.

Solar deliverables

Outputs are designed for pre-feasibility review and field planning. Remote sensing can narrow the search, but final approval still needs ownership, grid capacity, environmental permission, geotechnical review and ground validation.

• Solar site suitability map with ranked candidate areas
• Exclusion map for steep slopes, water, settlements, protected land and high-risk zones
• Flood, drainage and surface-water risk overlays
• Road access and grid proximity maps
• Parcel-level scoring table with criteria, weights and confidence notes
• GIS layers in GeoJSON, shapefile or project formats
• Field validation checklist for the shortlisted sites

When solar GIS screening helps

This workflow is useful when developers, investors, EPC teams or land teams need to compare many sites before deeper technical due diligence.

• Solar farm site shortlisting across a district or land bank
• Pre-feasibility screening before land acquisition or lease review
• Portfolio review of many proposed solar sites
• Flood and drainage risk screening for solar plant layouts
• Transmission, substation and access corridor prioritisation
• Environmental and land-use conflict screening before field survey