All Questions
Tagged with vectorization python
13
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
4
votes
1
answer
634
views
Vectorizing all pixels as separate polygons using rasterio
I use rasterio.features.shapes and use the geometry of pixels in raster data to create polygons for each pixel. Pixels with the same value merge these pixels if they are adjacent.
What I want is for ...
- 73
2
votes
1
answer
2k
views
Extracting raster outline to a vector geometry
I have a raster data set with an irregular outline (every value outside is NaN) in Python (loaded from rasterio v.1.3a3 ):
I'd like to extract its outline to a vector shape, such as a Shapely ...
- 10.5k
8
votes
1
answer
614
views
Creating a seamless vector dataset from raster with gdal, R or Python
I'm trying to create a seamless vector dataset from an integer raster. "Seamless" as in: not gaps between features and no overlapping features.
The tools gdal_polygonize, pkpolygonize, terra:...
- 1,003
0
votes
2
answers
601
views
How to polygonize NDVI raster using GDAL?
I have raster with NDVI values. I would like to polygonize the raster to get vector where each polygon is a pixel.
I have tried gdal.Polygonize as described in the documentation and that runs without ...
- 2,169
1
vote
0
answers
430
views
Draw polygon (vectorize) raster based on same colored pixels -- getting bad polygons
So, I have a TIF georeferenced map and a rather messy shape that I need to digitize. It is green but has a lot of holes in it that are light green color. So, I want to capture all green pixels and ...
1
vote
0
answers
52
views
Conceptual question on comparing rasterized data with vectorized (polygons) data
I've got this doubt on how to best proceed with the following situation: I would like to compare two datasets, one (model_data) is a raster (NetCDF format), with lat, lon and time as coordinates, ...
- 123
3
votes
1
answer
4k
views
Converting raster to line vector layer
I would like to convert all values having the value 1 in a binary raster to a line vector layer. The following image shows the binary raster (1=white and 0=black):
The optimal output would look like ...
- 1,576
0
votes
1
answer
4k
views
How to polygonise a binary raster with python?
I already asked this in StackOverflow, but maybe it's better here. I have a ndvi raster that I binarized (I put my threshold at 0.35) with a script python and I wanted to polygonize this raster, in ...
- 39
6
votes
1
answer
2k
views
Extracting the pixelwise proportion of classes of a finer raster in a coarser one
I have two rasters, one has a 1 km resolution. The other has a spatial resolution of 30 m. This latter pixelwise is a classification. I want to overlay the 1 km raster on the classification raster and ...
- 1,087
11
votes
3
answers
16k
views
How to convert float raster to vector with python GDAL
I have float raster and now I want to convert it to vector. How is it possible with the Python GDAL library?
I have tried with gdal_polygonize.py of GDAL utilities on the command line and it worked ...
- 399
6
votes
2
answers
6k
views
Converting points to lines with Python GDAL
I have a dictionary with points. The points are derived from a raster (see image below). The points are not sorted and are not in order. The dictionary looks for example like this:
pointDict = {0: (...
- 8,024
9
votes
2
answers
2k
views
Scriptable alternative to ArcScan (particularly vectorising lines within tolerances)?
Sadly the answer to Can you access ArcScan from a python script? suggests that it is not possible to script ArcScan from within a python script.
Therefore, does anyone know of any alternatives to ...
- 4,006