Bug report #1373
Derived area values from identify tool differ from calculated PostGIS area
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: |  nobody - | ||
| Category: | Vectors | ||
| Affected QGIS version: | Regression?: | No | |
| Operating System: | RedHat | Easy fix?: | No |
| Pull Request or Patch supplied: | Resolution: | duplicate | |
| Crashes QGIS or corrupts data: | Copied to github as #: | 11433 |
Description
When I identify a polygon with the identify tool, the derived area differs from the calculated area with postgis area(the_geom) function. The difference is small but existing:
QGIS: 15.516 km2
PostGIS: 15.525 km2
History
#1
Updated by Steven Mizuno about 16 years ago
Replying to hdus:
When I identify a polygon with the identify tool, the derived area differs from the calculated area with postgis area(the_geom) function. The difference is small but existing:
QGIS: 15.516 km2
PostGIS: 15.525 km2
If you are using On-the-fly transformation, the difference is because QGIS uses calculation on an ellipsoid rather than plane calculations as PostGIS uses for area().
Without OTF, QGIS uses plane calculations also, but there may still be a very small difference.
This is essentially the same problem as I put in #1219.
#2
Updated by Horst Düster about 16 years ago
- Resolution set to duplicate
- Status changed from Open to Closed
Already reported with #1219
#3 Updated by Anonymous about 15 years ago
Milestone Version 1.0.0 deleted