What is EOS-01?
It is an earth observation satellite.
EOS-01 is nothing but another Radar Imaging Satellite (RISAT) that will work together with RISAT-2B and RISAT-2BR1 launched last year.
Henceforth all the earth observation satellites would be called EOS-series.
What are earth-observation satellites used for?
Land and forest mapping and monitoring, mapping of resources like water or minerals or fishes, weather and climate observations, soil assessment, geospatial contour mapping are all done through earth-observation satellites.
Advantages of radar imaging over optical instruments:
Radar imaging is unaffected by weather, cloud or fog, or the lack of sunlight. It can produce high-quality images in all conditions and at all times.