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Results tagged with raster
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user 64224
Raster is a data format consisting of regular grids of values, usually stored in an image-like format.
1
vote
1
answer
211
views
Calculate data from a set of raster files
I need to make some calculations with data from raster files saved in my postgis database. I need, build a map, using the average from a set of these raster files, for example. … Besides, I'm worried with the performance, because if I have a lot of raster files, maybe can be better solve these calculations with R, by example, or not? …
- 121
1
vote
1
answer
285
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Clipping raster objects in PostGIS
I'm trying to cutting a raster object (from a PostGIS table) using a shapefile with reference, extracting raster data from a polygon area. My objective to work with the clipping raster into R. … metadata"
In original table (before cutting) I can work normally with my raster. …
- 121
5
votes
1
answer
934
views
Slow retrieve PostGIS raster value through ST_Value
I have a PostGIS DB containing a set of daily raster data from 1981 up to 2021. The inserted raster tile size is 83x90. … Execution time: 60353.772 ms
Looks like the raster structure maintains a kind of cache for each query, where, as farther away is the coordinate from the latest fetched point, the query takes so long …
- 121