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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Optimizing identification of tree stand boundaries

I am working on a workflow to identify tree stand boundaries. My desired result is the blue lines - I know it will never be like that, but I need it to be as good as possible. My best result is the ...
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86 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 ...
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866 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 ...
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1answer
38 views

Remove 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 ...
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41 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 ...
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153 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?
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32 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? ...
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130 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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48 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 ...
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253 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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472 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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638 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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183 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 ...
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119 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 ...
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197 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 ...
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329 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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12 views

Distance between two vector lines in each east-west raster row (in QGIS)

I have 2m-resolution raster LiDAR data of a marsh edge from two moments in time and I am trying to calculate how much the marsh has "retreated" between the datasets. I used the LiDAR data to ...
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26 views

Vectorizing a raster zone map without the lines turning into squares QGIS

Raster zone lines turn into squares after vectorizing my raster because of pixels between color zones QGIS
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167 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 ...
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1answer
72 views

Automatic Vectorisation in ArcGIS

Is there any method or tool/model for ArcGIS to draw automatic line based upon raster data values. E.g i have a DEM and i want to automatically generate a line feature passing through all those pixels ...
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30 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 ...
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408 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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1answer
1k 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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2k 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 ...
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591 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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159 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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63 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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97 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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920 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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98 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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33 views

Google Earth Engine Reducing Landsat Global Inland Waters Raster to Vector

I'm trying to create a vector outline of the water areas of the Landsat Global Inland Water raster in Earth Engine. I get the error "Line 3: water.addBands is not a function" from the ...
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31 views

Auto vectorization of raster in QGIS 3.14

Is it possible to do an auto digitize of a raster (downloaded and WMS)? I would like to create vector polygons out of it.
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81 views

Thresholding distance raster and vectorizing in Google Earth Engine

I am struggling to convert a raster to a vector using Google Earth Engine. I have produced an image using the ee.Image.distance() function where each pixel represents that pixel's distance in meters ...
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59 views

How can I vectorize contour lines from a DTM in QGIS?

I'm using QGIS 3.16. I am trying to do the following: Starting with a DTM model (geoTIFF format) I am computing the contour lines (100m) with QGIS. So far, so good. In order to import the results into ...
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22 views

Raster Values into Gridded Polygons with Same Cell Size using ArcMap

I have data in the form of a raster with 1 km x 1 km cells. I need to transfer it into a vector polygon grid layer (USNG) which also has 1 km x km cells, but has divergence around UTM zones and does ...
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20 views

FireCCI51 on Google Earth Engine: burnt area as shapefiles

How can I export my results as shapefiles (polygons) from the burnt area results (raster)? I intend to export these shapefiles to ArcGIS for further anlysis on a specific national scale. Link to ...
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31 views

Creating shapefile of a raster image in QGIS 3.6

I use QGIS 3.6 on Windows and I have been trying to convert raster images into shapefiles. I managed to do that for Digital Terrain Models only, using the conversion --> vectorize tool in the qgis ...
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27 views

Is there a plugin for batch conversion of raster data to vector on QGIS?

I know there is Polygonize but it's just not practical for me because it fails for batch process and there a lot of files that I want to convert in one go. I'm dealing with temperature data stored in ...
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50 views

Raster to Lines fails (R)

I have the following set of images where a set of 8-neighbor contiguous pixels are outlined in each image, representing a line. The images are distinct, but the lines generally run from left to right. ...
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89 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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245 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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39 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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48 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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35 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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151 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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30 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 ...