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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34 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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1answer
565 views

Create polygons based on raster values

I have 4 raster layers contained in a raster stack within program R. The layers represent occurrence surfaces for two species in two seasons (i.e. species one summer and winter and species 2 in summer ...
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893 views

How to polygonise a binary raster with python?

I already asked this in StackOverflow, but maybe it's better here. I have a ndvi raster that I binarized (I put my threshold at 0.35) with a script python and I wanted to polygonize this raster, in ...
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476 views

Estimating resolution of vector data?

I got an old vector dataset with polygons covering a continent. The data was first published on paper at scale 1:5 000 000 and was later digitalized. I don't have the original data and no information ...
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1answer
46 views

Attributes of polygons in a shapefile based on largest area intersection with polygons from a different shapefile [duplicate]

I have a shapefile of landcover. It was developed from a raster dataset (the Crop Data Layer). I also have a grid of 50x50m cells (polygons in a shapefile) I have overlain on the landcover shapefile....
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1answer
691 views

Raster to polygon fails in ModelBuilder iteration

I need to vectorize some rasters to polygons and to do so, I use the "Raster to Polygon" tool in ArcGIS. As there are many rasters, I use a iteration in ModelBuilder. The output workspace is a ...
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134 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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1answer
35 views

Production a shapefile ID : Big record but small volume

How can I generate a shapefile with ArcGIS by converting raster to vector? My specifications file number when and numerous records but small size and low volume of bytes. My method was save image ...
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1answer
591 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. ...
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2answers
953 views

Converting raster layer to vector using ArcGIS Desktop?

I have a raster layer (processed from landsat thermal band). But this data does not contain attribute table. I want to convert this into a vector layer of polygon features; holding an attribute table ...
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116 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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130 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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1answer
117 views

How to delineate/vectorize polygons out of a spline surface?

Often I generate hotspot surfaces at the point level, I'll quickly run through my workflow: by taking the points, making a copy running the integrate tool at a 1-mile XY tolerance I am calculating ...
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2answers
607 views

Batch convert ESRI Ascii Grid files to MapInfo TAB

I’m looking for a ‘quick’ (in terms of my time, not computer time) solution to converting a whole bunch of ESRI Ascii Grid files into MapInfo TAB files consisting of a grid of points with XYZ fields. ...
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1answer
1k views

Converting colored .Tiff images to Shapefiles using ArcScan?

I have a digital map of water pipelines (water lines in various colors, parcel data in black). I want to convert the .tiff image's water pipelines (not parcels) to a shapefile. I have the .tiff geo ...
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390 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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1answer
87 views

From raster to vector format? [closed]

I have files from two sources, one has come from http://www.worldclim.org, contains climate variables such as precipitation and temperature on a world scale, in raster format. The other has the ...
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2answers
8k views

How to convert a raster image to vector shapefile in qgis? [closed]

Please show the detailed conversion process.
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2answers
75 views

Creating lines from polygon layers boundaries?

I need to find boundaries between two polygon layers and express them as lines. There are plenty of polygons in each layer, so I'd like to avoid doing it "by hand". Example: Red line shows how ...
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2answers
629 views

Raster to CSV with x y cell center coordinates, the original raster cell value, and values from another raster avoiding shapefile

I am looking for FOSS (maybe GDAL/OGR) solutions to a problem. I need to go from raster (200 million records) to CSV. It is easy enough to do via point but the point file breaks the allowable 2GB “...
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2answers
2k 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,...
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1answer
1k views

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

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,...
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2answers
609 views

Get Raster Centroid using Arcpy

Purpose:To take an input raster image and clip its shape to a parcel block. In later stages this model will be applied to a loop. Logic: The Model receives an input raster image and calculates a ...
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107 views

Automated georeferencing based on topological point pattern matching in ArcGIS [closed]

I have a lot of building plans (PDF/PNG format) which I would like to automatically georeference. I have the base map "OS Mastermap Mono", which is use for a lot of the building plans. If I use ...
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299 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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162 views

Arcpy code only works when run in two chunks, not as one piece [closed]

I have a weird thing happening with my script. When I copy/paste it into the python cmd line within ArcMap, I get error messages. However, if I run the first part, then copy in the very last line by ...
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2answers
523 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 ...
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1answer
6k views

How to clip raster and split by individual polygons in QGIS

I have two layers. The first one is a vector layer with 6 polygons. The other one is a raster layer. I need to extract specific surface information for my polygons (average slope value). The ...
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1answer
138 views

Creating random points in vectorized raster in ArcGIS for Desktop?

Im conducting an accraucy assessment of an NLCD map. First, I wanted to create a few points in each land cover category in Arc, convert it to kml format, then pull it into Google Earth to make sure ...
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1answer
3k 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 ...
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2answers
2k 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 ...
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762 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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155 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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61 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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1answer
968 views

Under what situation do we use Rasterisation or Vectorisation?

As mention in the title, Rasterisation is the conversion of vector maps to raster grid. While Vectorisation is the conversion of raster grids to vector maps but under what situation would we use these?...
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1answer
767 views

Extracting the pixelwise proportion of classes of a finer raster in a coarser one

I have two rasters, one has a 1 km resolution. The other has a spatial resolution of 30 m. This latter pixelwise is a classification. I want to overlay the 1 km raster on the classification raster and ...
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3answers
316 views

Grass GIS: ArcGIS' “Raster to polygon” equivalent

I've got a small clipped extent of a LANDSAT image and I need to have the single pixels as polygons in order to tell the overlap proportions of overlaying polygons. In ArcGIS I used "Raster to polygon"...
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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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1answer
445 views

Jpg Photo to point layer

How do I open a Geotag (.jpg) Photo in ArcGIS 9.3 (or photo to point)? In 10 and above versions it shows an ArcPhoto option in Data Management tools, but not in Arcgis 9.3.
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852 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 ...
2
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1answer
5k views

Converting DEM to Floating Point Raster (FLT) using QGIS?

I am looking to convert a .DEM exported from AutoCad to a floating point raster file type (.FLT) utilizing QGIS to implement in HEC-RAS Mapper. This is accomplished easily in Arc using the Raster>...
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2answers
564 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 ...
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0answers
279 views

Calculating vector area in QGIS? [closed]

I have calculated a viewshed (ZVI) in OpenWind and opened the raster in QGIS I have then converted the raster to a vector When I open the attribute table there are 4682 rows (features) and there is ...
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6answers
861 views

In what real-world examples do users still digitize features from a map?

Is digitizing of map features completely dead? For example, when and why do you still digitize features from a map? It can be heads digitizing up from a scanned paper map (or image, or whatever) or ...
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3answers
6k 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 ...
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1answer
462 views

Incorrect vectorization from a raster in ArcGis (ArcScan)

I am trying to make a vectorization to get lines from a raster image using arcscan. I saw some users making it but using easier images with more visible lines but is not working with my image. could ...
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1answer
1k views

Free implementation of Polynomial Approximation with Exponential Kernel (PAEK) algorithm

I need a Free (i.e. Open Source) implementation of the Polynomial Approximation with Exponential Kernel (PAEK) algorithm, preferably in C, C++, Python, Julia or R. The algorithm is one of the ...
2
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1answer
169 views

Preserving polygon boundaries when vectorizing raster according to polygon vector? [closed]

I have a raster which I clip by some polygons and then convert to polygon. I would like to obtain the same number of polygons in both my vector files. The problem is that some areas in the vector ...
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1answer
3k views

Automatically vectorizing data from WMS using ArcGIS Desktop (ArcScan)?

I am facing a problem, when I have a historic map in WMS layer and I need to get buildings from this map (approx. 2000) to vector layer fo further analysis. Is there any workflow how to ...