Bug report #4347
raster and vector rendering mismatched by 1 pixel at some zoom levels
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: | - | ||
| Category: | Rasters | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | invalid |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 14284 |
Description
I'm not 100% sure if this counts as a bug:
Depending on the zoom level, a raster image and a vector with the same extent (created using gdaltindex) are not quite rendered in the same location. Usually they are out by 1 pixel, as in the attached screenshot, although the other day I saw 2 pixels.
When I first saw this I decided it was an issue with the raster rendering, not the vector rendering, but I can't remember why. Maybe because sometimes gaps are visible between adjacent raster layers or something.
Radim mentioned on the mailing list the other day that on-the-fly raster reprojection uses rounding if the difference is less than one pixel, so I thought it might be a problem with that, but it still shows up when not using OTF reprojection.
History
#1
Updated by Giovanni Manghi almost 13 years ago
- Target version set to Version 1.7.4
#2
Updated by Paolo Cavallini over 12 years ago
- Crashes QGIS or corrupts data set to No
- Affected QGIS version set to master
- Target version changed from Version 1.7.4 to Version 1.8.0
#3
Updated by Paolo Cavallini about 12 years ago
- Target version changed from Version 1.8.0 to Version 2.0.0
#4
Updated by Giovanni Manghi about 12 years ago
- Resolution set to invalid
- Status changed from Open to Closed
It does not seems a qgis issue as also on other gis sw it looks the same.
#5
Updated by Alister Hood about 12 years ago
Which other gis?
I think there is a "bug" in it/them as well.