Exporting GeoTIFF with NODATA Values
dcollins
Global Mapper User
Hi Mike,
I've been using Global Mapper v10.02 to export elevation data in the GeoTIFF format (both 16-bit and 32-bit), and I'm encountering a problem encoding NODATA values: I cannot find any TIFF tags in the exported GeoTIFF which identify the NODATA value.
Does Global Mapper support NODATA values in exported GeoTIFF files? If so, how does it identify those values?
Thanks,
Dave
I've been using Global Mapper v10.02 to export elevation data in the GeoTIFF format (both 16-bit and 32-bit), and I'm encountering a problem encoding NODATA values: I cannot find any TIFF tags in the exported GeoTIFF which identify the NODATA value.
Does Global Mapper support NODATA values in exported GeoTIFF files? If so, how does it identify those values?
Thanks,
Dave
Comments
-
Dave,
Global Mapper writes out -32767 for all void values in elevation GeoTIFF exports. You can also use the min and max value tags to determine the range of valid elevations, and treat anything outside this range as invalid (Global Mapper does this).
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
Mike,
Thanks very much for clarifying. You've told me exactly what I need to know.
Thanks,
Dave -
Im not seeing any option in the Geotiff export option to set a valid min or max elevation?
I am trying to read srtm .hgt files and to remove the cells with elevations of 0. Is this the best way to proceed?
TIA -
TIA,
That option is on the Adjust Elevations tab of the Options dialog for the layer available from the Control Center. Just adjust the min/max range there, then do the export.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
HI, I just found this discussion...
I have to export a real NaN to the GeoTiff instead the -32767 Value. Is this possible?
Thanks,
Aicke
Categories
- 12.7K All Categories
- 5.6K Features Discussion
- 342 Downloading Imagery
- 1.3K Elevation Data
- 380 Georeferencing Imagery Discussion
- 628 GM Script Language
- 53 User Scripts
- 113 GPS Features
- 414 Projection Questions
- 819 Raster Data
- 1.3K Vector Data
- 6.6K Support
- 177 Announcement and News
- 908 Bug Report
- 558 SDK
- 1.2K Suggestion Box
- 3.7K Technical Support
- 562 Other Discussion
- 129 GIS Data Sources
- 27 Global Mapper Showcase
- 233 How I use Global Mapper
- 107 Global Mapper Forum Website