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Results tagged with postgresql
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user 117932
PostgreSQL is an open source object-relational database system.
5
votes
1
answer
323
views
Obtain the footprint of a large raster in PostGIS
I need to get the footprint (not the extent) 10GB raster in PostGIS similar to this question (but it's a very old question without any proper answer). So far the best approach I have come up with is
W …
- 489
4
votes
2
answers
619
views
Why is my ST_Union output disproportionately large?
I have two multi-polygon geometry tables (see the figures below) in my PostGIS database and I would like to create a union of these two tables. They are ~12mb and ~1mb in size. However, the union of t …
- 489
3
votes
1
answer
295
views
ST_Reclass strange behaviour in PostGIS
I am applying st_reclass to my PostGIS raster table (band 4 ) to
replace all sel_value where 0 < sel_value < 100 to 1
replace all zeros with no data value which in my case is 255
My code is below
SE …
- 489
1
vote
2
answers
811
views
Why doesn't ST_Intersects work with multiple rows of geom
I am new to PostGIS. I am trying to find the conditional intersection between two multi-polygons PostGIS tables (tab1 and tab2) when tab2 meets certain criteria (defined by row values of one of the co …
- 489