[GRASS-user] scale error for each pixel

[Ken Mankoff]

Dear Helmut,

On 2017-11-02 at 07:17, Helmut Kudrnovsky <hellik at web.de> wrote:
> Ken Mankoff wrote
>> Does GRASS (or GDAL?, proj4?) have a function (or addon) to provide the
>> scale error  for a given cell?
>
> AFAIR there is now an area function in r.mapcalc in GRASS trunk to calculate
> the pixel area.

There is. I've just built GRASS 7.5. But the area() function just returns nsres*ewres for each cell, it does not consider projection errors.

I'll look into the lower-level proj code for this.

Thanks,

  -k.