All Questions
Tagged with vectorization postgis
6
questions
1
vote
1
answer
119
views
Fastest way to clip millions of small polygons and storing results as JSON [closed]
I have a dataset with couple million farm polygons (around 2.5 million and only expected to grow in the future), and I need to calculate the NDVI for these farm polygons, with some basic stats (...
- 3,346
7
votes
3
answers
361
views
Simplification by constrained anti-aliasing in PostGIS
I vectorized a raster data set, therefore, I'm facing a "steps" effect, or aliasing, due to the fact that the vectorization strictly follows the raster cells. So, the geometry is quite large ...
- 10.5k
0
votes
1
answer
200
views
Load GeoTIFF band value into PostGIS
I am trying to upload a geoTIFF file into my PostGIS database. Using raster2psql, it works.
raster2pgsql -I -C -M *.tif -F -t auto mytablename > mytable.sql
psql -d mydatabase -f mytable.sql
...
- 323
3
votes
0
answers
435
views
Kernel Density with vector output and/or possible automation?
I'm currently working on a project that will have me calculate the kernel density of a number of shapefiles with varying parameters. My current workflow goes like this:
Import shapefiles in QGIS 2.10....
- 41
4
votes
1
answer
5k
views
Convert a raster to GeoJSON polygons in PostGIS
I'm trying to convert a raster to a polygon and export it from PostGIS as GeoJSON. Specifically I want each pixel to be a polygon with associated the raster value.
PostGIS seems to have a few ...
- 393
7
votes
3
answers
3k
views
Raster to vector conversion
I have a bunch of raster maps from a general plan of a city.
Examples:
Areas reserved for federal, regional and municipal buildings
Special land use zones
Zoning
Risks of occurrence of emergencies
...
- 1,047