Hi there! Yesterday, I gave an introductory workshop at University on how to download OSM-data off its website and work on it in QGIS. The students are in master's degree now and learned ArcGIS in their study runs only. So we have to make QGIS tasty to them.
I've explained the students, how to switch to a metric projection (EPSG:25832) instead of the geographical one (EPSG:4326). Then we've filtered out shops Then the students should filter out all the shops in their hometown and calculate the airlining distance to their flat. I've used hub lines for this. The dialog informs about distance in meters. It's a lie. The resulting distance is in decimal degrees. So 600 meters ere about 0.1 [whatever]. Of course, it's easy to calculate the real distance using "$length" in field calculator, but why?! QGIS functions should detect that coordinates are in geographic projections and should inform that the result isn't metric OR switch to a processing system, which gives metric results. There are many libraries, which can calculate VERY accurate and quick on ellipsoids. With less than 0.01 mm of errors. Most of us might be aware that's normal behavior in QGIS, but most of new users will not be aware that meters in GUI aren't meters and dataset. Best regards, Tobias _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
