Background
The global NASA/Indian Space Research Organisation Synthetic Aperture Radar (NISAR) soil moisture product will provide a well- calibrated and validated soil moisture product with 200-meter resolution globally (approximately 500-m for the Sahara due to challenges of measuring soil moisture in dry sand). There will be a minimum of two products every 12 days from both ascending and descending orbits, with more frequent observations at higher latitudes as the orbits begin to converge closer to the poles.