Troubleshoot Data Import Problems
Potential Probems
- Need GDAL?
- Program crashes or hang on loading the dataset
- Map has incorrect location
- Data set does not plot on the map
Metadata, looking especially for the datum and projection.
- There may be a metadata file in the data download (probably in a
different directory if a single file download contains subdirectories.
- There may be metadata on the web site where you downloaded.
- For Geotiffs, use the MICRODEM option to look at the file.
This has a different format than GDAL, and has some information that
GDAL ignores, such as the vertical datum.
The file must display for this to work.
- For GEOTIFFS, JP2, PDF, ADF, you can use GDAL. Other than some
Geotiffs, all of these files must go through GDAL.
- The Resample menu has some options
to correct or assign the datum and projection, and you can also use the
GDAL command line.
Rasters
Open quick vector map , and if the data set
opens, File, Match other
maps, Outline coverage area. This will show where the program thinks
the data is and shows problems with the hemisphere, UTM zone, or the correct
units for SPCS data in feet.
- If the data set had to go through GDAL, run the command in a CMD window
and look for error messages. The command will be in the
debug log, which you must access before you
reopen the program.
- If the file was a batch command, you must run the batch file
from the CMD window.
- If the command was a single line, you must cut it and paste it into
the CMD window and then hit enter.
- If the program is not in the UTM projection or a geographic project, run
it through GDAL WARP.
Vectors
Open quick vector map , and if the data set
opens.
- MICRODEM only uses files in Geographic coordinates on the WGS84 datum,
and should warn you if you need to reproject. You should try GDAL/OGR
first, and then MICRODEM's option.
You may have to determine the projection from the metadata.
Last revision 7/22/2020