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Jan
31
revised How to improve PostGIS raster query
querry format
Jan
30
comment intersecting two shapefiles from Python or command line
It seems you didn't enter the correct link for the GeoPandas website. Can you update please?
Jan
27
comment Converting Python GDALDataset to C++ GDALDataset
I would advice to refactor your python code before creating an extension. Can you give more details why the GDALRasterBand call back is slow?
Jan
24
awarded  Popular Question
Jan
22
comment Looking for more realistic 3D terrain renderer than ESRI Arcscene
btw im voting for reopen
Jan
22
comment Looking for more realistic 3D terrain renderer than ESRI Arcscene
You are looking for Terragen planetside.co.uk . Simple enough but also very in-depth as you go along. It;s been around for many year. Used to work with it 5 years ago. It does amazing work; also has been used to many many films.
Jan
16
reviewed Approve Arcobjects vb.net forms in Arcmap 10.0
Jan
16
comment Converting GeoTIFF into non-compressed format for WhiteBox?
@Ifyoudonotknow-justGIS 'COMPRESS=NONE' is the default, for the gtiff driver, so it's safe to omit.
Dec
22
comment Improve performance on a st_dwithin query (in PostGIS)
and for better viewing : explain.depesz.com/s/nHS
Dec
22
comment Improve performance on a st_dwithin query (in PostGIS)
I have a feeling that the roads table is not vacuumed and/or a spatial index is not build on it
Dec
22
comment display of raster in QGIS - cells are not rotated
Can you post the ds.GetGeoTransform tuple?
Dec
22
comment using a linear solver to get a “centre of gravity” of a set of points
The above applies if all the points have equal weight. I start to suspect that you want to put a distance weight The point would be biased to be closer to where your 'customers' are more clustered. Other than that as far as I know, geometrically there is only one center of gravity.
Dec
22
comment using a linear solver to get a “centre of gravity” of a set of points
I guess so. The aim is to serve the customers. If you choose 10 initial points (from your customers), you can derive the ideal solution to serve them. Of course the coordinates of the ideal would fall in the 'air' so the next best 'depot' to serve them would be the closest depot to the ideal. If I understood correctly
Dec
22
comment Find Minimum Bounding Box for a set of coordinates
in that case; you're looking the for the BBox. its a parallelogram with opposite corners at xmin,ymin and xmax,ymax.
Dec
22
comment Find Minimum Bounding Box for a set of coordinates
I was working on that atm. Also cgal libraryhas a solution for it in its API
Dec
21
answered using a linear solver to get a “centre of gravity” of a set of points
Dec
21
answered Is there a minimum number of required samples/ data points for IDW Interpolation in ArcGIS for Desktop?
Dec
21
comment using a linear solver to get a “centre of gravity” of a set of points
I think you are looking for the Circumcenter, of the convex hull formed of your points. The convex hull probably would be an irregular polygon, so the problem tranforms as the Smallest-circle problem. The center of that circle would be your ideal position, offering the shortest distance what would serve your points. Certainly is not the minimum average distance.
Dec
18
comment Georeference raster in non horizontal plane
whats the question again?
Dec
18
comment Create a line from an array and measure its length with PostGIS (ST_MakeLine, ST_Length)
The query expects a datatype of geometry or geography. You need to cast that value as such. Did you try postgis.net/docs/ST_GeomFromWKB.html ?