Questions tagged [vectorization]
The conversion of raster data (an array of cell values) to vector data (a series of points, lines, and polygons).
57
questions with no upvoted or accepted answers
6
votes
2
answers
271
views
Removing additional lines from vectorized stream network
I have a large raster stream network (excerpt below) in QGIS that has been thinned using r.thin (light blue squares) and then vectorised using r.to.vect (pink lines). However, because some of the ...
- 5,279
6
votes
0
answers
211
views
Telling gdal_polygonize.py how to interpret colors / what does the `DN` field mean
I have lots of raster files I am converting to polys with gdal_polygonize.py. All these images have a consistent palette which I'd like to map to an attribute in the resulting polygons.
On most ...
- 161
4
votes
0
answers
1k
views
Seeking QGIS plugin with functions like ArcScan?
Is there a QGIS plugin which does raster scanning, like ArcScan.
Typical QGIS Vectorization returns very bad outputs that have thousands of 'islands'.
I require a clean and efficient vectorization ...
- 51
3
votes
0
answers
996
views
Automatically creating polygon/lines vector from WMTS Raster Building Footprint using QGIS?
I have a WMTS layer "EMAP15" http://wmts.nlsc.gov.tw/wmts providing footprints as raster layer.
I am trying to create 3D LOD1 buildings in Sketchup, but I have to trace each building as vector lines ...
- 41
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
2
votes
0
answers
118
views
Contour Polygon Alternatives on QGIS
I am trying various ways to make polygons from raster data using 1 m DEMs. I am using QGIS 3.16 Hannover I have tried vectorizing my data, which does work OK, but I would like smoother boundary lines ...
- 545
2
votes
0
answers
156
views
Is my raster too large to realistically vectorize in ArcGIS Pro?
I'm new to ArcGIS Pro so go easy on me. I have a raster file(.img) of the continental US broken up into 30x30m grid resulting in about 10 billion individual pixels. I need to index each of these ...
- 21
2
votes
0
answers
884
views
ArcScan equivalent in QGIS
Is there any thing in QGIS which can perform operations like ArcScan? I put WMS polygon layer as a base map. I save it as PNG and when I add it as a raster layer, I can vectorize it with ArcScan. I ...
- 39
2
votes
0
answers
462
views
QGIS is flipping my rasters when I vectorize them
I am using QGIS to vectorize some raster layers. I was able to do this fine a week ago, but now every time I use the vectorize tool, the resulting vectors are flipped upside down. Any suggestions?
- 99
2
votes
0
answers
68
views
Generate multiple polygons based on JPEG image?
I have a number of image files depicting polygons (the original shapefiles are lost). Is there a way to automatically create new polygons in GIS, based on the form of the shapes visible in the image?
...
- 21
2
votes
0
answers
179
views
Doing automatic vectorization in ArcMap?
I'm using ArcMap 10.6; ArcScan. I am trying to run an automatic vectorization on my .tif file. I've cleaned up my raster, and am doing Start Editing - Vectorization - Show Preview (looks good) - ...
2
votes
0
answers
118
views
Completing dashed line shapefile feature that was created with ArcScan?
Using ArcScan to vectorize a raster floodplain boundary map, I have selected the area, run ArcScan in the area, to output a Shapefile of the line. ArcScan worked to create the line, and it is a dashed ...
- 21
2
votes
0
answers
337
views
Error while converting raster into vector in QGIS
I am using QGIS 2.18.23 and trying to convert a raster file (.tif) into a vector file (.shp). But I am getting an unusual error:
2018-08-28T12:41:38 1 Traceback (most recent call last):
...
2
votes
0
answers
521
views
Can QGIS create Vector Polygons from Raster Data?
I normally use Esri, am new to QGIS, and don't know a lot of terminology and definitions.
I am working with georeferenced geologic maps. Each formation is coded with a different color or color ...
- 29
2
votes
0
answers
253
views
Delineating coastline with panchromatic imagery
I have a panchromatic satellite image with a large coastline area and my goal is to delineate this coastline with a maximum accuracy and minimum amount of manual work. What is the best option to ...
- 3,583