Creating points along line at ellipsoidal distance

Question

I need to create points along a polyline in QGIS 3 at every 1000m of ellipsoidal distance and have tried several tools, as suggested in other answers:

• Points along geometry
• QChainage plugin
• Convert lines to points (SAGA)

All of these can create points along a straight, two-node line, but do so at planimetric distances, so when I measure with my measuring tool (in planimetric mode) I get 1000.000 m:

However, if I switch on the WGS84 ellipsoid distance measurement, I get a deviation:

I'm working in WGS84/UTM32N. I already know the ellipsoidal length of my line and the last measurement point at the end of the line should have the same ellipsoidal value.

Is there any way to do this in QGIS 3? Am I missing some basic coordinate system logic? I am working in a UTM CRS, which is planimetric, I guess?

Answer 1

I would believe that you need to project the line to a azimuthal equidistant system, centered on the line origin.

Proj4: +proj=aeqd +lat_0=LINE_ORIGIN_LAT_HERE +lon_0=LINE_ORIGIN_LON_HERE +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs  

Densify there and then verify measuring the ellipsoid distance. It should work..