Hello Vincent, in case it could be related to my recent issue with r.param.scale:
https://lists.osgeo.org/pipermail/grass-user/2020-October/081788.html In my case there was most probably something wrong with my OpenMP configuration. HTH, Vincent. Le mercredi 09 décembre 2020 à 13:59 +0100, Vincent Godard a écrit : > Dear Grass users, > > I've been using r.param.scale to compute various type of curvatures > over > a 1 m LiDAR DEM (FCELL) (from opentopography.org) : > > r.param.scale --o -c input=dem output=curvature size=15 method=profc > r.info -r curvature > > I usually get reasonable results like (checked with independent > calculations) : > > min=-0.203124601340989 > max=0.0685868278408049 > > But when running this command repeatedly, I randomly (usually every > 3rd > or 4th time) get very different results like : > > min=-127112309.998249 > max=131128979.492382 > > I am running GRASS 7.8.4 on Ubuntu 20.04. The problem is also > present > when running r.param.scale from QGIS or rgrass7 (in a R session). > > I have replicated the problem with another high resolution DEM of > different source (still FCELL), and also with a 30 m SRTM DEM > (CELL), > but in this case the occurrence of these odd results is less > frequent > and they are not contrasting as much with the expected outcome > ("only" > by a 1 or 2 order of magnitude). The problem is present with or > without > the -c option, and seems only to affect the computation of > curvatures > (profc,planc,longc,crosc,minic,maxic). > > Has anyone encountered something like that, or have any idea about > what > might be going on? > > Thanks in advance, > > Vincent > _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
