Questions tagged [vectorization]

The conversion of raster data (an array of cell values) to vector data (a series of points, lines, and polygons).

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27
votes
5answers
28k views

How to convert image of map into vector format?

What is the best way of converting a gif of a map into a vector format, such as a shapefile? The only relevant parts that I am interested in are the outline of the island so I realize some manual ...
5
votes
2answers
4k 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 ...
12
votes
2answers
5k views

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 ...
9
votes
2answers
4k views

Spatial statistics tools : clustering analysis on raster data

I've an apparently simple problem, but i can't find a clear methodology to use. I'm tasked to delimit "urban areas" by vector convex polygons, using the Gridded Population of the World dataset from ...
10
votes
5answers
4k views

How to generalize and vectorize a LandUseClassification raster file?

I want to vectorize that rasterfile with its 6 landuse classes. The classification is very noisy and have to be generalized before. The result should be a polygone vector file. I use SAGA, (GRASS) ...
7
votes
2answers
2k views

Converting raster to vector by generating center lines?

I have a binary raster containing boundary pixels with the value 1 (white) and no-boundary pixels with the value 0 (black): I would like to vectorize the raster by keeping one center line trough the ...
9
votes
2answers
1k 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 ...
3
votes
4answers
3k views

Converting Esri ASCII raster to Shapefile for CartoDB?

I have an ArcGIS grid ascii file (Ramankutty Cropland at 5 minute resolution) that begins as follows: ncols 4320 nrows 2160 xllcorner -180 yllcorner -90 cellsize 0....
3
votes
2answers
1k views

Convert raster to a CSV values and lat long based on raster value in QGIS

I am looking to convert a raster into a csv file (or tab delimited) based on values in the raster (Value > 0). The csv would have three values, latitude of center of cell, longitude of center of cell,...
3
votes
1answer
2k views

Convert 3-band raster imagery to distinct vector zones in ArcGIS

So much like the title says I would like to convert a 3-band infrared image TIF file of vegetation into distinct vector feature zones using ArcGIS. I'm guessing the only way to do this is with ...
2
votes
2answers
470 views

Extracting coastline as vector from landsat 8 imagery?

I am trying to detect some sea level rise/fall for a specific region, from Landsat imagery. I went through the recommended methods of identifying water/land (MNDWI, AWEI, Bandratio 5/2, etc.). Now ...
4
votes
1answer
2k views

Convert image in KMZ to polygon

I have a KMZ file that contains several image overlays (RF coverage plots). I would like to convert the image overlays to polygons to decrease loading time in Google Maps. Currently I'm tracing a ...
4
votes
1answer
2k views

Convert a raster to GeoJSON polygons in PostGIS

I'm trying to convert a raster to a polygon and export it from PostGIS as GeoJSON. Specifically I want each pixel to be a polygon with associated the raster value. PostGIS seems to have a few ...
3
votes
2answers
1k views

Creating point shapefile from GeoTIFF using GDAL/OGR?

I have a 0.05 deg global maps (~8000 files) in GeoTiff format. It's a kind of a mask containig "1" and "0". I need to create a point shapefile for each raster with points located over "1" values of ...
2
votes
2answers
538 views

Vectorizing from raster image with discontinuities or breaks in polygons?

I am new to this site, so I have explained much as i don't know proper terminology. I am using ArcGIS Desktop 9.3, in which I am trying to create vector polygon shapefile. But the raster image i have ...
1
vote
1answer
77 views

Converting Raster to Vector, Google Earth Engine,

By running the code, one obtains: FeatureCollection (Error) Image.reduceToVectors: First band ('x') of image must be integral. I don´t understand this error. My goal is to convert the pixel values ...
1
vote
2answers
237 views

Error “generate features” with ArcScan vectorization

Windows 10, ArcGIS 10.4.1/ArcScene 10.4.1.5686 I have a geotiff that I pulled in from a pdf. I'm in an edit session of ArcScan and when I Show Preview, the output looks great. However, whenever I try ...
0
votes
1answer
341 views

Error coercing raster to SpatialPixelsDataFrame in R

I obtain the below error when I try to coerce my raster to a vector. Initially my rasters are of different extents and I use the projectRaster tool to obtain the same extent for both the rasters. ...