[GRASS-user] Estimating import time for large data file

[Rich Shepard]

On Sun, 31 May 2020, Markus Neteler wrote:

> ogr2ogr
>   -simplify <tolerance>
>    Distance tolerance for simplification. Note: the algorithm used
> preserves topology per feature, in particular for polygon geometries, but
> not for a whole layer.

Markus,

Thanks for confirming this approach.

> ... keep in mind that AFAIK this may damage the topology (i.e. gaps
> and slivers may arise between polygons).
> So, select the <tolerance> with care...

Given that I have no experience selecting tolerances for simplfy please
suggest what I should read to make an informed first guess.

Regards,

Rich