There are small differences between length measurements done by qgis and postgis or geod.
For example, I have a line with 2 vertices. I use Identify Features tool or Measure Line tool, results are the same.
When I query postgis with st_length or use geod, results slightly differ. Postgis and geod results are consistent.
Reference systems in both cases are the same. QGIS version is 1.7.4.
What the difference comes from?
Tell me more
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closed as not a real question by underdark♦ Nov 13 '12 at 19:24
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
