What is the difference between SRTM 1SEC Grid data and SRTM1 SEC HGT data and SRTM 3 SEC data?
SRTM data come in multiple versions and different processing by different groups, see:
USGS SRTM Quick Guide [PDF].
What is the difference between SRTM 1SEC Grid data and SRTM1 SEC HGT data and SRTM 3 SEC data?
SRTM data come in multiple versions and different processing by different groups, see:
USGS SRTM Quick Guide [PDF].