Continuous records of the Earth’s surface
Quadrature Earth reconstructs time series from remote sensing data and fuses observations across sensors. Radar, optical, and thermal imagery each see the surface differently and at different times; combined, they give a consistent, gap-free view of how a place changes.
Satellite archives are irregular: revisits vary, clouds obscure scenes, and sensors change over time. We rebuild regular, comparable sequences from these records so change can be measured month to month.
Radar measures structure and moisture through cloud and darkness. Optical and thermal sensors measure reflectance and temperature. We align and combine them into single, coherent products.
Basemaps
Monthly SAR basemaps of the places clouds usually hide.
Regional Sentinel-1 SAR composites at 30 m resolution, regenerated every month.
Why radar
Optical satellites need clear skies and daylight. In the tropics, in monsoon season, and through the polar winter, that can mean months without a usable image. C-band radar sees the surface regardless.
Each monthly composite is processed the same way: orbit correction, radiometric calibration, terrain flattening, and multi-temporal speckle reduction. One month is directly comparable to the next.
At a glance
- Source
- Sentinel-1 C-band SAR
- Resolution
- 30 m
- Cadence
- Monthly and weekly
- Coverage
- Regional, on request
Research
Alongside the basemap, Quadrature Earth carries out applied research in multi-sensor Earth observation. Enquiries welcome.