I'm using Landsat L1G for our project and need L1G to be geometric corrected for later use. One thing I know for sure that L1G need to be employed a Digital Elevation Model (DEM) for topographic accuracy. I follow a guide to use ArcMap (from ArcGIS) to correct the uncorrected Landsat image. But the process required DEM and DOQ (Digital orthophoto quadrangle) image to run. DEM is available but DOQ is not available outside US.
As I read, ArcMap using DOQ to establish the GCPs for uncorrected image. Since the DOQ is not available, I wondering if only using DEM to correct the L1G image is good enough? In other hands, can anyone know that the Landsat L1G is corrected with GCPs?
We decided to use data from L1T source instead. But I face another problem can't find any information about satellite observation zenith angle/azimuth of Landsat image. We need it to make sure two different image has the same condition for further calculation. Any one have idea where I can find that information?