All Questions
Tagged with vectorization polygon
7
questions
0
votes
2
answers
75
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Converting vectorization (raster to vector) with small steps in values in QGIS
I have a raster file that contains water depths in m. The water depths are the only attribute and should be transferred to the vector layer.
The raster files have a cell accuracy of 1m x 1m. I would ...
- 19
3
votes
1
answer
1k
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Finding external boundary of bunch of vectors (using R libraries)
I have vectorized raster as in the image. This is actually 1419 polygons in SpatialPolygons class object.
I'm looking for a method which would allow me to extract the one most external polygon (...
- 477
2
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0
answers
317
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Converting historic map data (raster) into polygon format? [closed]
How do I convert historical buildings from map data (raster) into a polygon format?
The historic maps that I am referencing are the Sanborn Fire Insurance Maps. Here is the link to an example in case ...
- 29
1
vote
0
answers
117
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When digitizing, polygons are inverted
I need to use QGIS to digitize my images. My images are scanning electron microscope (SEM) images of rocks. I am interested in analyzing the pore space in the images. Here is the steps I follow:
I ...
- 11
3
votes
3
answers
6k
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How to make mapable geo data from a solid jpg/png
I have a bunch of hardiness zones, as you can see here: http://mangoly.herokuapp.com/workroom/googlemaps/zones/
They are solid colored PNG images. I know the geo coordinates of the bottom left hand ...
- 81
7
votes
1
answer
927
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Generalize large polygon-file
I have a large polygone file with landuse information (6 classes). Its vectorised from a raster classification so the polygons are all angular. Any of my tries to generalize with v.generalize (sneaks, ...
- 8,338
15
votes
2
answers
7k
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How to smooth large vector polygons from Raster
I have a landuse classification raster file (6 classes) of a large area. But I need it in vector polygons so I vectorised it. No problem so far, but the result is - of course - that every pixel is ...
- 8,338