Bug report #11919
Calculation of areas in feet off by a factor of 10 in Illinois east projection
| Status: | Closed | ||
|---|---|---|---|
| Priority: | High | ||
| Assignee: | - | ||
| Category: | Vectors | ||
| Affected QGIS version: | 2.6.1 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | duplicate |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 20128 |
Description
When digitizing in EPSG:3435 ( Illinois East (ftUS)) and calculating areas from the $area value in the field calculator, the areas given are 1/10th of the true value. When digitizing the same area with the projection set to EPSG:26971 (Illinois East (meters)) the $area measurement is the correct value. Not sure if it's an epsg problem or internal meters to feet conversion problem.
I am uploading sample polygons in each projection for the same area covering a square field a bit over 16 ha ( 40 acres).
Platform is ubuntu 14.04 using qgis 2.6.1 from the ubuntugis unstable ppa
History
#1
Updated by Doug Newcomb almost 10 years ago
WMS service for background imagery to see field digitized http://gis.apfo.usda.gov/arcgis/services/NAIP/Illinois_2014_1m_NC/ImageServer/WMSServer
#2
Updated by Doug Newcomb almost 10 years ago
Using area calculation measurement tool in toolbar gives correct area in meters.
#3
Updated by Giovanni Manghi almost 10 years ago
- Operating System deleted (
Ubuntu Linux 64 bit) - Category changed from Attribute table to Vectors
- Status changed from Open to Feedback
- OS version deleted (
14.04)
it seems to me that this issue is duplicate of #10966, please leave feedback.
#4
Updated by Giovanni Manghi over 9 years ago
- Resolution set to duplicate
- Status changed from Feedback to Closed