Bug report #1196
projection parameter +no_uoff is not applied to layer SRS; affects Michigan GeoRef
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: |  nobody - | ||
| Category: | Projection Support | ||
| Affected QGIS version: | Regression?: | No | |
| Operating System: | All | Easy fix?: | No |
| Pull Request or Patch supplied: | Resolution: | invalid | |
| Crashes QGIS or corrupts data: | Copied to github as #: | 11256 |
Description
background: the PROJ.4 definitions for Michigan GeoRef (EPSG:3078, 3079) don't work properly unless +no_uoff is included in the definition. There is PROJ.4 mailing list traffic about this.
A Custom Projection can be created for Michigan GeoRef by copying the 3078 parameters and adding +no_uoff. This can be saved ok and the parameters test ok.
When this custom projection is applied to a layer the +no_uoff parameter disappears from the SRS string on the General tab of layer properties and the layer is not projected properly.
History
#1
Updated by Maciej Sieczka - over 15 years ago
- Resolution set to invalid
- Status changed from Open to Closed
Current stable GDAL interprets EPSG:3078 in the following way:
$ epsg_tr.py 3078 -proj4 # NAD83 / Michigan Oblique Mercator <3078> +proj=omerc +lat_0=45.30916666666666 +lonc=-86 +alpha=337.25556 +k=0.9996 +x_0=2546731.496 +y_0=-4354009.816 +ellps=GRS80 +datum=NAD83 +units=m +no_defs <>
As you see there is no no_uoff parameter above. Since QGIS CRS is created according to GDAL's interpretation of EPSG codes (epsg_tr.py output) this is not a QGIS issue but a GDAL one.
Please report it to GDAL devs. Once it is fixed in GDAL (i.e. epsg_tr.py produces a correct proj4 representation of EPSG codes in question) add a notice to this ticket and QGIS CRS database will be updated.
#2 Updated by Anonymous over 14 years ago
Milestone Version 1.0.0 deleted