Hi,
I developped a plugin for the city of Lausanne on QGIS 2.18, and used
qwt5 to implement an elevation graph, which works quite well.
Now that a want to migrate my plugin to QGIS3, and knowing that qwt5 is
linked to PyQt4, I'm not able to find which module to use in my Python
code, or even
Working with a project in EPSG 3857 (Pseudo Mercator, Google Maps or USGS
Topo) when using the measuring tool for distance the Cartographic distance
and Ellipsoidal distance differ greatly. I assume that cartographic
distance is a simple calculation using plane coordinates which have been
projected
Pseudo Mercator (or Web Mercator) is a projection that is not
suitable for
distance (or area) measurements. So the discrepancies
are expected.
For a short explanation, see for instance
https://gis.stackexchange.com/a/14532 or wikipedia.
Håvard
On 07.06.2020 20:13, Stewart Holt wrote:
> Working
