11, 2022 12:43 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Postgis Raster determine exact hull
Hi,
Try to reclassify the raster first so that all "non NA" values are equal (e.g.
1), then do ST_DumpAsPolygons.
Regards,
Marcin
pon., 10 sty 2022 o 21:27 Richa
Hi,
Try to reclassify the raster first so that all "non NA" values are equal
(e.g. 1), then do ST_DumpAsPolygons.
Regards,
Marcin
pon., 10 sty 2022 o 21:27 Richard Huesken
napisał(a):
> hi,
>
> I'm using postgis 3.1 and I'm looking for the best way to obtain the exact
> hull of a raster (excludi
hi,
I'm using postgis 3.1 and I'm looking for the best way to obtain the exact
hull of a raster (excluding the nodata points). The st_minconvexhull uses
the MBR of the raster coverage, and is therefore quite fast. The result is
however not as accurate as I require.
I constructed some sql that use
