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Fishnet overlaid on shapefile centroids with Python
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I have an interesting problem and I'm not sure how to approach it.
I am a newcomer to the GIS world so I'm not 100% confident with the terminology, but I am trying to overlay a grid (fishnet/raster?) over top of a set centroids that I have calculated from the polygons in a given shapefile.
Such that each space in the grid contains exactly one centroid.
I'm not sure if there are any standard methods or theories to accomplish this so I'm just looking for a pointer in the right direction.
Additionally, the code I have been developing is in Python so I would like to stick to that environment.
python raster vector-grid centroids
edited 2 mins ago
Vince
14.7k32749
asked 7 hours ago
jdv12jdv12
11
add a comment |
I have an interesting problem and I'm not sure how to approach it.
I am a newcomer to the GIS world so I'm not 100% confident with the terminology, but I am trying to overlay a grid (fishnet/raster?) over top of a set centroids that I have calculated from the polygons in a given shapefile.
Such that each space in the grid contains exactly one centroid.
I'm not sure if there are any standard methods or theories to accomplish this so I'm just looking for a pointer in the right direction.
Additionally, the code I have been developing is in Python so I would like to stick to that environment.
python raster vector-grid centroids
edited 2 mins ago
Vince
14.7k32749
asked 7 hours ago
jdv12jdv12
11
Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago
add a comment |
I have an interesting problem and I'm not sure how to approach it.
I am a newcomer to the GIS world so I'm not 100% confident with the terminology, but I am trying to overlay a grid (fishnet/raster?) over top of a set centroids that I have calculated from the polygons in a given shapefile.
Such that each space in the grid contains exactly one centroid.
I'm not sure if there are any standard methods or theories to accomplish this so I'm just looking for a pointer in the right direction.
Additionally, the code I have been developing is in Python so I would like to stick to that environment.
python raster vector-grid centroids
edited 2 mins ago
Vince
14.7k32749
asked 7 hours ago
jdv12jdv12
11
I have an interesting problem and I'm not sure how to approach it.
I am a newcomer to the GIS world so I'm not 100% confident with the terminology, but I am trying to overlay a grid (fishnet/raster?) over top of a set centroids that I have calculated from the polygons in a given shapefile.
Such that each space in the grid contains exactly one centroid.
I'm not sure if there are any standard methods or theories to accomplish this so I'm just looking for a pointer in the right direction.
Additionally, the code I have been developing is in Python so I would like to stick to that environment.
python raster vector-grid centroids
python raster vector-grid centroids
edited 2 mins ago
Vince
14.7k32749
asked 7 hours ago
jdv12jdv12
11
edited 2 mins ago
Vince
14.7k32749
asked 7 hours ago
jdv12jdv12
11
edited 2 mins ago
Vince
14.7k32749
edited 2 mins ago
Vince
14.7k32749
edited 2 mins ago
Vince
14.7k32749
14.7k32749
asked 7 hours ago
jdv12jdv12
11
asked 7 hours ago
jdv12jdv12
11
asked 7 hours ago
jdv12jdv12
11
11
Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago
add a comment |
Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago
Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago
add a comment |
1 Answer
1
active
oldest
votes
If you use a cell size whose diagonal is smaller than the minimum distance among all pairs of points, no more than one point per cell should happen automatically.
You can find the minimum distance by using (the equivalent of ESRI's) Near tool. Then just do the algebra to get the dimensions of the fishnet grid cells or raster cellsize:
cell_side_length = mindist/sqrt(2)
answered 6 hours ago
J KellyJ Kelly
914518
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
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votes
active
oldest
votes
If you use a cell size whose diagonal is smaller than the minimum distance among all pairs of points, no more than one point per cell should happen automatically.
You can find the minimum distance by using (the equivalent of ESRI's) Near tool. Then just do the algebra to get the dimensions of the fishnet grid cells or raster cellsize:
cell_side_length = mindist/sqrt(2)
answered 6 hours ago
J KellyJ Kelly
914518
add a comment |
If you use a cell size whose diagonal is smaller than the minimum distance among all pairs of points, no more than one point per cell should happen automatically.
You can find the minimum distance by using (the equivalent of ESRI's) Near tool. Then just do the algebra to get the dimensions of the fishnet grid cells or raster cellsize:
cell_side_length = mindist/sqrt(2)
answered 6 hours ago
J KellyJ Kelly
914518
add a comment |
If you use a cell size whose diagonal is smaller than the minimum distance among all pairs of points, no more than one point per cell should happen automatically.
You can find the minimum distance by using (the equivalent of ESRI's) Near tool. Then just do the algebra to get the dimensions of the fishnet grid cells or raster cellsize:
cell_side_length = mindist/sqrt(2)
answered 6 hours ago
J KellyJ Kelly
914518
If you use a cell size whose diagonal is smaller than the minimum distance among all pairs of points, no more than one point per cell should happen automatically.
You can find the minimum distance by using (the equivalent of ESRI's) Near tool. Then just do the algebra to get the dimensions of the fishnet grid cells or raster cellsize:
cell_side_length = mindist/sqrt(2)
answered 6 hours ago
J KellyJ Kelly
914518
edited 5 hours ago
answered 6 hours ago
J KellyJ Kelly
914518
answered 6 hours ago
J KellyJ Kelly
914518
answered 6 hours ago
J KellyJ Kelly
914518
914518
add a comment |
add a comment |
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Do you have the grid already? QGIS has 'gui' tools for this...
– DPSSpatial
6 hours ago
Usually the polygon is overlaid with the fishnet (vector) or grid (raster). If you just have a centroid, the fishnet can be virtual, with the resulting polygons generated on the fly. The complicating factor is the definition of centroid which varies by meaning.
– Vince
5 hours ago