Bug report #20931
Merging rasters replaces nodata cells with 0
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Rasters | ||
| Affected QGIS version: | 3.4.1 | Regression?: | No |
| Operating System: | Windows 7 | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | no timely feedback |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 28750 |
Description
Similar to Bug report #15749, but in QGIS 3.4.2:
When using ther "merge" tool from the "raster" tab (Raster -> Misc -> Merge), all the cells with "nodata" are converted to 0.
History
#1
Updated by Giovanni Manghi over 5 years ago
- Regression? changed from Yes to No
- Status changed from Open to Feedback
if any this would be a gdal bug, not a qgis one. Anyway you must ensure that the rasters you are merging have a well defined no data value (in opposition to "not defined" as shown by qgis) otherwise the output will not be the one is expected.
#2
Updated by Mathieu Paradis over 5 years ago
Giovanni Manghi wrote:
if any this would be a gdal bug, not a qgis one. Anyway you must ensure that the rasters you are merging have a well defined no data value (in opposition to "not defined" as shown by qgis) otherwise the output will not be the one is expected.
Yes I agree it would be a GDAL matter. I posted it as a qgis problem since the GDAL module was integrated is the basic tool set you can find in the upper menu bar.
Regarding the no data value, I'm getting 3,40282346639e+038 when I look into the properties of the rasters, both with QGIS and ArcGIS. I honestly couldn't tell if this would be classified as "well defined" for I lack a bit of knowledge on the matter.
#3
Updated by Giovanni Manghi over 5 years ago
Regarding the no data value, I'm getting 3,40282346639e+038 when I look into the properties of the rasters, both with QGIS and ArcGIS. I honestly couldn't tell if this would be classified as "well defined" for I lack a bit of knowledge on the matter.
post your data (or sample of).
#4
Updated by Giovanni Manghi about 5 years ago
- Resolution set to no timely feedback
- Status changed from Feedback to Closed