Changes in DEM creation, undulation correction and in orbit download

[anurag-kulshrestha]

• Changes in create_dem.py:
– Applied patch on in the _srtm_listing() function to change
the source for DEMs
– Uploaded the missing WW15MGH.DAC file and
provided https://github.com/anurag-kulshrestha/
geoinformatics/raw/master/WW15MGH.DAClink
– Patched to correctly geo-register the downloaded EGM file
• Changes in download_sentinel_data_orbits.py
– Changed the link for orbit download to https://scihub.
copernicus.eu/gnss
– Streamlined the download process by updating the web-
crawler.