Moritz Lennert

As the link to the Irmischer and Clark article points to a closed-access version, here's a link to a pre-publish, proof version: https://escholarship.org/content/qt9m37m9hw/qt9m37m9hw.pdf?t=p430ey. The main elements are these formulas: ...

IIUC, in order to implement the proposed alternative algorithm, 'all' that needs to be done is to replace the '_fcost_dtm + (DIAG_fac * a)_' part of the cost calculations in...

Thinking about this a bit more, maybe the best option would be to first implement this in a separate (add-on) module r.walk.gaussian. r.walk already has a long list of parameters...

On 17/01/22 19:27, Māris Nartišs wrote: > Thinking about this a bit more, maybe the best option would be to > first implement this in a separate (add-on) module r.walk.gaussian....

I've tested and can confirm that in current trunk, results between GRASS GIS and the GeographicLib implementation in R (geosphere) are identical (to the sq m): ``` v.in.ogr ellipsoidal_area.geojson out=ell_test...

> If mlennert also used PROJ 7.2.1, there must be some numerical instability in the GeographicLib as included in PROJ, otherwise differences between mlennert and metzm might be due to...

> > But PROJ geodesic.h states that "for the WGS84 ellipsoid, the errors are less than 15 nanometers". Thus I expect accurate and consistent (!) results for our example which...

> > > I'm on Debian testing. Is there any env variable I need to set or something ? Is there a way to test that I'm really using the...

This also might be a good entry point for new developers: [https://grasswiki.osgeo.org/wiki/GRASS_GIS_APIs](https://grasswiki.osgeo.org/wiki/GRASS_GIS_APIs).

I also like the landing page the way it is now. Development should really focus on programming, so as a baseline it should provide a series of (commented) links to...