Re: scale error for each pixel
Ken Mankoff <[email protected]>
| Newsgroups | gmane.comp.gis.grass.user |
|---|---|
| Message-ID | <[email protected]> |
Dear Helmut and GRASS List, On 2017-11-02 at 07:17, Helmut Kudrnovsky <[email protected]> wrote: > Ken Mankoff wrote >> Does GRASS (or GDAL?, proj4?) have a function (or addon) to provide the >> scale error for a given cell? >> >> My understanding is that for a given projection, the "lat_ts" term of >> the proj4 string describing the projection is where 1 m in GRASS is >> actually 1 m. Elsewhere, errors grow. I'd like to track these. > > AFAIR there is now an area function in r.mapcalc in GRASS trunk to > calculate the pixel area. Is the scale error only in longitude and never in latitude? Or can it be in both? Is there a way to find the error for a length error rather than an area error? Specifically, for a vector line with an arbitrary heading? Thanks, -k. _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user