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dem_import
Added by Kang Liang almost 3 years ago
Hi,
I am using dem_import to import dem in geotiff format to gamma format.
The dem contains volcano and ocean.
I find that the non-values in dem are not well recognized.
Attached are the visualization from disdem_par. You can find some data of the ocean areas are recognized as nonvalue and some are 0.
The original dem file is 3DEP dem 3dep_n53w170.tif downloaded from https://apps.nationalmap.gov/downloader/#/
I am using the GAMMA_SOFTWARE-20211208.
Thanks a lot!
Kang Liang
Replies (3)
dem_import and working with DEM data with the GAMMA software - Added by Charles Werner almost 3 years ago
Hello,
Attached is a short readme Alaska_DEM.txt on processing the data for an DEM
download from the same USGS server. The issues you are seeing should be dealt
with using these steps.
Our experience is that the Copernicus DEM is excellent for terrain geocoding of
radar. It is more up to date and has
fewer errors than the USGS DEM. Here is how to download these data:
- Copernicus DEM 30m and 90m data are freely available for everyone, while the
10m version is available for - Copernicus member countries. #
- The process starts with mandatory registration (29-Jun-2020):
- - follow the instructions described in
https://ssoidp.copernicus.eu/idp/umsso20/login?faq - - the account should be ready the next day
- - sign in: https://cdsportal.copernicus.eu/web/spdm/home
- - you should have an automatic subscription to the Copernicus DEM (otherwise
get it) - - use the Panda interface
(https://panda.copernicus.eu/web/cds-catalogue/panda) to select
# and download DEM tiles (COP-DEM_GLO-90-DGED/2019_1) - - for bulk download, connect using an FTP client as described here:
https://spacedata.copernicus.eu/documents/20126/0/Data+Discovery+and+Download+Guidelines+(8).pdf- - the DEM in GeoTIFF format is in the DEM directory, the AUXFILES directory
contains additional information
Examples are shown in the Gamma demo for working with DEMs.
http://userdata.gamma-rs.ch/Gamma_Software_demo/Gamma_demo_DEM.tar.gz
You can send a request for the password to download the examples if you have a
valid license to
Best regards,
Charles
| Alaska_DEM.txt (1.38 KB) Alaska_DEM.txt |
dem_import and working with DEM data with the GAMMA software - Added by Charles Werner almost 3 years ago
Hello,
Attached is a short readme Alaska_DEM.txt on processing the data for an DEM
download from the same USGS server. The issues you are seeing should be dealt
with using these steps.
Our experience is that the Copernicus DEM is excellent for terrain geocoding of
radar. It is more up to date and has
fewer errors than the USGS DEM. Here is how to download these data:
- Copernicus DEM 30m and 90m data are freely available for everyone, while the
10m version is available for - Copernicus member countries. #
- The process starts with mandatory registration (29-Jun-2020):
- - follow the instructions described in
https://ssoidp.copernicus.eu/idp/umsso20/login?faq - - the account should be ready the next day
- - sign in: https://cdsportal.copernicus.eu/web/spdm/home
- - you should have an automatic subscription to the Copernicus DEM (otherwise
get it) - - use the Panda interface
(https://panda.copernicus.eu/web/cds-catalogue/panda) to select
# and download DEM tiles (COP-DEM_GLO-90-DGED/2019_1) - - for bulk download, connect using an FTP client as described here:
https://spacedata.copernicus.eu/documents/20126/0/Data+Discovery+and+Download+Guidelines+(8).pdf- - the DEM in GeoTIFF format is in the DEM directory, the AUXFILES directory
contains additional information
Examples are shown in the Gamma demo for working with DEMs.
http://userdata.gamma-rs.ch/Gamma_Software_demo/Gamma_demo_DEM.tar.gz
You can send a request for the password to download the examples if you have a
valid license to
Best regards,
Charles
| Alaska_DEM.txt (1.38 KB) Alaska_DEM.txt |