Questions tagged [vectorization]

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

Filter by
Sorted by
Tagged with
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. ...
0
votes
2answers
534 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 ...
2
votes
0answers
110 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
votes
0answers
92 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 ...
0
votes
1answer
90 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 ...
1
vote
2answers
483 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. ...
1
vote
1answer
653 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 ...
1
vote
0answers
251 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 ...
1
vote
1answer
73 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 ...
-1
votes
2answers
7k views

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

Please show the detailed conversion process.
0
votes
2answers
74 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 ...
1
vote
2answers
440 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 “...
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,...
0
votes
1answer
736 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,...
3
votes
2answers
472 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 ...
2
votes
0answers
93 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 ...
2
votes
0answers
233 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....
4
votes
0answers
148 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 ...
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 ...
7
votes
1answer
5k 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 ...
2
votes
1answer
130 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 ...
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 ...
3
votes
0answers
602 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 ...
1
vote
0answers
135 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 ...
1
vote
0answers
57 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 ...
2
votes
1answer
821 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?...
6
votes
1answer
662 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 ...
2
votes
3answers
237 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"...
1
vote
0answers
95 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 ...
2
votes
1answer
400 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.
1
vote
0answers
730 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
votes
1answer
4k 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>...
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
0answers
267 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 ...
1
vote
6answers
786 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 ...
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 ...
1
vote
1answer
438 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 ...
7
votes
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
votes
1answer
153 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 ...
1
vote
1answer
2k 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 ...
2
votes
1answer
392 views

Smooth vectorized outlines in QGIS

I have taken a raster image and coverted it to a vector file. It is an Ordnance Survey map which shows field boundaries etc. As the vector file has been created from the pixelated raster file the ...
-1
votes
1answer
571 views

Automatic capture (Raster to Vector) using ArcGIS Desktop? [closed]

I would like to know the automatic process for Scanned hand drawn line Raster to vector conversion.
3
votes
0answers
770 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 ...
7
votes
2answers
3k views

Convert points to lines with Python GDAL

I have a dictionary with points. The points are derived from a raster (see image below). The points are not sorted and are not in order. The dictionary looks for example like this: pointDict = {0: (...
1
vote
0answers
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 ...
3
votes
3answers
5k views

How to make mapable geo data from a solid jpg/png

I have a bunch of hardiness zones, as you can see here: http://mangoly.herokuapp.com/workroom/googlemaps/zones/ They are solid colored PNG images. I know the geo coordinates of the bottom left hand ...
2
votes
1answer
7k views

Converting jpg file to shapefile? [duplicate]

I am developing a GIS application like this: By now my steps are: I have got a jpg file, 5040 x 8179 dimension. In this map, the roads, rivers, towns etc. are marked. I am using .Net to develop and ...
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....
7
votes
3answers
2k views

Raster to vector conversion

I have a bunch of raster maps from a general plan of a city. Examples: Areas reserved for federal, regional and municipal buildings Special land use zones Zoning Risks of occurrence of emergencies ...