Questions tagged [vectorization]

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

34 questions with no upvoted or accepted answers
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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 ...
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66 views

Extracting GeoTIFF colours and adding to equal geometry shapefile

I have the following map in .png-format that I would like to replicate, but I cannot obtain the original data. The map shows the current water supply vulnerability for local municipalities in South ...
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778 views

Watershed Segmentation SAGA-GIS

I'm trying to segment a topographic map to vectorize it. I'm using the watershed algorithm of SAGA-GIS. It's working fine with polygons, but with roads or contour lines is not working properly. Here ...
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65 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) - ...
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27 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 ...
2
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78 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): ...
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0answers
150 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 ...
2
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0answers
111 views

Using Orthophotos - not multispectral - to generate Object-oriented image classification vectors?

I'm using QGIS version 2.14.3-Essen on a Macbook pro. I'm sort of new to this and feeling my way through this. I have high-resolution Orthophotos officially sourced from local country in Sub-saharan ...
2
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0answers
97 views

R raster rasterToPolygon Error

I'm trying to convert a RasterBrick to polygon, across four different resolutions. It works for the coarsest three resolutions, but for the finest resolution, I get an error that I can't find much ...
2
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0answers
238 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....
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19 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? ...
1
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2answers
27 views

Load GeoTIFF band value into PostGIS

I am trying to upload a geoTIFF file into my PostGIS database. Using raster2psql, it works. raster2pgsql -I -C -M *.tif -F -t auto mytablename > mytable.sql psql -d mydatabase -f mytable.sql ...
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17 views

Refine Raster Layer / remove Color bleeding

I have a Raster layer of Population density in a low resolution. These raster layer has color bleeding between the different population areas. Is there a way, to remove them in QGIS like color ...
1
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1answer
126 views

Converting large raster to vector?

I have a shapefile which contains 10.000 polygons and I want to know how many of them falls on a specific land use. Unfortunately, the land use map that I have to use is a raster map and not a vector ...
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244 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 ...
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0answers
411 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 ...
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258 views

QGIS: Raster to vector too large

I am working with a DTM of 5x5m for a large area (already clipped it). I calculated the slopes and want to maintain only the slopes above 2 degrees. I already used the raster calculator to set all ...
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137 views

Grass GIS table creation error during r.to.vect

When I execute r.to.vect the following error appears: r.to.vect input=sreviLC815109_-120_-120 output=temp feature=area --o --q DBMI-DBF driver error: ERROR: Unable to create table: create table temp ...
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58 views

Grass GIS r.to.vect: Prevent neighboring cells with equal values from being unified

I've got different satellite image bands as GRASS rasters, which I want to convert to vector dataset. As I want to compare the IDs of the cell polygons later on, the neighboring cells with ...
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96 views

Convert manual colored maps to vector

Is there a way to colorimetrically and automatically vectorize georeferenced rasters that came from manually colored, scanned maps? Currently we Print the topography maps 20k scale --> hand-coloring ...
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0answers
746 views

How to OCR topographic maps

I have old topographic maps that I have scanned and converted into PDF in Acrobat XI 11. I need this PDF to be text-searchable (not mere image). To do this I tried text recognition in Acrobat but it ...
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95 views

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 ...
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25 views

How to get pixel per meter in MATLAB

I have a vector shapefile which is in unit of 'Meter' presenting boundary of overall Germany. I am converting it into raster format based on each pixel representing 300 Meters respectively. After ...
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42 views

Digitizing contour lines from a picture in QGIS

I have a map with isobaths (water depth), like in this picture, and I would like to digitize them. Is there any tool or procedure in QGIS that can recognize the lines in the picture and create a ...
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17 views

Using dangleTolerance in arcpy.RasterToPolyline_conversion?

When convering raster to polylines, I understood that I can specificy the minimum line length with dangle tolerance, but this does not seem to be working. Is this not possible, or am I misusing the ...
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26 views

Polygon to Raster conversion: Raster shifted ~10m horizontally. How to fix?

I converted a number of polygons into a raster. The cell size is correct but the raster has shifted ~10m horizontally. Is there an issue with my method or is there a tool I can use to fix this?
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66 views

How to delete little geometries without hole in python script

I'm writing a python standalone script from a old PyQGIS script. Input data is a raster of which I would like to delete little areas. In the PyQGIS script, I vectorized it and used GRASS v.clean to ...
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28 views

v.surf.idw raster file conversion into a vector with same colours style

Is it possible to convert from raster to vector the raster file resulting from grass interpolation algorithm "v.surf.idw" coloured with the quantile method and maintain such colours in the vector file ...
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34 views

Pulling Data off PNG map scan using ArcGIS Desktop?

I have scanned a map with several trade routes on it and georeferenced it on top of a hydrology (river system) map of the U.S. The scanned map is a PNG file. How can I pull off the trade routes? ...
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0answers
852 views

How to convert a raster to a 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 (value 1=white and 0=black): The optimal output would ...
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33 views

Why point layer result (showed as pixel centers) in this PyQGIS code rotated?

I have a point vector layer that have a field data. I want to disaggregate this field data to a raster layer by distance. It means when we away from a point, value in each pixel have smaller value and ...
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117 views

Shapefile filling

I converted a raster into a shapefile. When I set no filling I see the contours of the different forms within the shapefile. When I set a filling, the whole file is filled, not only the shapes inside. ...
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29 views

Creating new symbology to be used for ArcMap?

I have a copy of scanned paper that has all the allotment may symbology that I am going to need them to add them to ArcMap 10.3.1. I have done creating new symbols that I worked on from my Ski Area ...
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10 views

Convert raster to line without using GRASS or SAGA

I am trying to find a way to convert a raster file to a polyline that does not use GRASS. The reason being is that my organization wants to avoid using the GPL license, under which GRASS is licensed. ...