Indigenous Satellite Geotagging & Physical Change Engine
VOJAS combines India's indigenous ISRO NavIC sovereign positioning system with ISRO Bhuvan Geoportal and Copernicus Sentinel-2 L2A optical bands for tamper-resistant infrastructure verification.
ISRO NavIC Geotagging
Utilizes India's 7-satellite regional constellation (3 GEO + 4 GSO) on L5 and S bands for sovereign, tamper-resistant coordinate verification and geo-fencing.
Multispectral Band Analysis
Computes NDVI (Vegetation Index), NDBI (Built-up Index), and BSI (Bare Soil Index) at 10m resolution to detect physical earthwork and structural progress.
Temporal Timeline Passes
Compares pre-sanction baseline passes against weekly post-sanction satellite passes over verified NavIC coordinates to monitor physical execution.
100% Honest
If cloud cover exceeds thresholds or coordinates are unmapped, VOJAS explicitly reports INSUFFICIENT_IMAGE_QUALITY instead of guessing.
Indigenous NavIC Protocols & Anti-Fabrication Principles
ISRO NavIC Anti-Spoofing Sovereign Geotagging
NavIC (IRNSS) delivers sovereign positioning accuracy within the Indian territory and up to 1,500 km beyond. Asset geotags recorded via NavIC are resilient against civilian GPS spoofing, ensuring field inspection coordinates match actual worksites.
AI Interpretation vs. Ground Truth
Satellite change scores are evidence signals generated for human review. They serve as audit indicators, not legal proof of fraud or completion.
Resolution Limits & ISRO Bhuvan Integration
Optical satellite bands operate at 10m spatial resolution. Small indoor renovations or interior equipment purchases cannot be detected by optical satellite imagery and are classified accordingly.
Zero Synthesized Pixels
When satellite tiles are missing or obscured by dense monsoon cloud cover, VOJAS never outputs synthetic pixels or invented spectral indices.
Inspect Geocoded Projects
Browse projects with verified coordinates and inspect their NavIC and satellite observations.