> > > > 2. I would like to see a check box or selection widget of some sort that > > chooses between using Geodesic math or the current method of calculating > the > > distances which I am still unsure on how it is doing its calculations. > > If you expand down the info box you'll get a detailed description of > exactly how QGIS is calculating the distances. Is there something > missing there? >
In some sense the measure tool is rather confusing. You can't just use it without really reading up on how to use it and even then I am not 100% sure I am getting the results I want, but as I look more into it I also realize I have had a narrow view on how users might use it. When you click the configuration button it takes you to the Map Tools Options. What I didn't initially realize is that there are also project properties that you also need to set as well. There is not a button on the measure tool dialog that takes you to that dialog to change those settings. Can this be simplified some how? By default it appears that "None / Planimetric" is selected as the ellipsoid. I think that for many people trying to use QGIS they are not going to know how to get the settings set correctly to get accurate measurements. I personally prefer to have the defaults set so that all measurements make use of the Vincinty algorithm - projecting the coordinates to latitude and longitudes and then doing that calculation. This would give relative accurate measurements, but for the user that has a local projection then they might want to select something else. By the way there appears to be a problem with selecting Project Properties->General Ellipsoid settings for QGIS 3. Every time I go into these settings the Ellipsoid is set to "None / Plainimetric" and it is not enabled. I have to click on the CRS tab and then go back for it to be enabled. > > > Right now it could use the Vincinty algorithms in QGIS to calculate the > > distances, but eventually I would like to see the geographiclib > algorithms > > used. > > I'd start with the bearing changes (since they are self contained, and > the methods for calculating bearing are already present in the QGIS > api). Then using geographiclib could be discussed as a separate set of > changes, to be decided on its own merit. If you mix these two changes > it's likely to get bogged down as one or other part of the changes are > debated. Ok.
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