On 16 February 2016 at 09:34, Blumentrath, Stefan <[email protected]> wrote: > Hi Nyall, > > Thanks for your work on this issue(s) and esp. the unit tests.
Thanks Stefan - it's much appreciated! > > I did a swift test with a 100km vector grid using master version 5d989ab > (which probably does not contain all your changes?). Yes, that version is missing some of the changes (specifically the area related changes). > Area measurements are consistent across field calculator and identify tool. > However, the field calculator (using an 8 digits numeric field) shows some > minor and probably neglectable imprecisions (e.g. compared to GRASS). GRASS > reports exacly 10000000000.00000000 m2, while the field calculator gives > something like 10000000000 +/- 0.0005 (OTF off). That sounds reasonable to me. > > With OTF on measurements differ significantly compared to GRASS and OTF off, > due to ellipsoidal metric used with OTF on I guess. Personally, I find this > difference confusing, but I trust the difference in behavior btw. OTF on and > off is a deliberate choice of the more accurate area measure?! > > Choosing no measurement ellipsoid in the project settings gives the same > behavior as OTF off. It *is* a little confusing here, but I'm reluctant to change this behaviour so close to a release. For 2.16 I'll break the link between OTF and ellipsoid, so that regardless of the OTF status you can set a specific ellipsoid or force planar calculations. Nyall > > Kind regards, > Stefan > > > > > > -----Original Message----- > From: Qgis-user [mailto:[email protected]] On Behalf Of Nyall > Dawson > Sent: 15. februar 2016 21:49 > To: qgis-developer <[email protected]>; qgis-user > <[email protected]> > Subject: [Qgis-user] Please test length/area measurement in master > > Hi all, > > Just putting out a call for extensive testing of length and area measurements > in the current master version. Over the past week I've done a bunch of work > trying to simplify the situation regarding length/area calculation and unit > handling, with the intention of closing http://hub.qgis.org/issues/13209 and > the other outstanding area calculation issues (plus locking all this down > with unit tests!). > > I'd really appreciate thorough testing being done by users to ensure that > this bug is now indeed fixed prior to the 2.14 release. > > Things to check: > > - measured length/area is consistent across the identify tool results, field > calculator, and measure tool. (note that there's still an open bug regarding > virtual fields - there's a PR open to fix this but it's not merged yet). > Testing with different combinations of geographic/non geographic CRS, OTF > projection on/off and various ellipsoid/planimetric calculations would be > perfect. > - test the new project properties settings for project distance/area units > and coordinate formats > - test the reworked options for QGIS angle units and measurement of angles > using the measure tool > > Thanks in advance! > > Nyall > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-developer mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer
