Raster is a data format consisting of regular grids of values, usually stored in an image-like format.

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How to extract percentage of land cover from a raster according to multiple shapefiles?

I have a raster map that represents land cover of a region, and different shapefiles (total 120) in the same region. I want to know the percentage of every land cover for each shapefile. For example, ...
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48 views

Tiff Raster File slow to Load in Win 7 64 Bit QGIS 2.6.1

I have been unable to load a Geo Referenced Tiff file in 2.6.1, I have found it it will load but takes minutes, It will load quickly in 2.4 It is a Lidar file so it is large, about 14 gb in size, I ...
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How can I equalize raster?

I've got 2 rasters , its seems that 1 has the data equalized (all values from 1-65535 are there) and the 2nd don't . Is there a process I can run in order to equalize the data in the 2nd raster ? ...
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48 views

Conversion of Polygon vector files to Raster GRID 8 bit unsigned integer

I am trying to convert a polygon shapefile layer into Raster GRID with 8 bits and which is unsigned integer. I managed to convert the shapefile in ArcGIS with the Arc Toolbox Conversion tools, but the ...
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27 views

How can one modify map service legend (specifically raster layer)?

I've got the raster layer in my map service, which in fact is created automatically by asynchronous GP service as its output result ("View results with a map service" option). The raster is symbolized ...
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QGIS Raster moving when Majority filter

I'm running QGIS 2.01 Dufour on Linux Mint. Data & project are WGS84. I'm trying to smooth a grid & following other posts here I've used the Majority filter. This is looking helpful, but the ...
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40 views

raster and vector misalignment

my vector and raster datasets align perfectly fine in Arcmap but not in QGIS, any suggestion on solving this dilemma is very much appreciated.
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Web Server/Technology to work with Raster-Imagery Data

I am in the process of designing a web application which will allow the end users to load raster imagery data (size range from 300 MB to 500 MB) as a back ground map and a corresponding OLD JPEG image ...
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61 views

Creating a Raster of Road Distance to Point

I am using QGIS 2.6. This question is in two related parts: I'm trying to create a raster of travel time from one point to another point travelling via the road system. Each raster pixel will roughly ...
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85 views

How to convert a 3-band image to a color-mapped one-band 8-bit image with ArcGIS or FME?

I have a 3 band image which needs to be converted to a 1 band image with colour-map so that I can assign different colours to the values. How can I first create a 1 band image out of RGB images with ...
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142 views

Permission denied when clipping raster

Trying to use raster extraction clipper to prepare a selected area of the map for generating contours - keep getting the error message: ERROR 1: TIFFOpen:everest_gmted30.tif: Permission denied ...
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“Points To Raster Tool”- Output pixel values differ from original point values

I am trying to convert an evenly spaced set of points to a raster using the "Points To Raster" tool in 10.1. Problem: Generally, the raster makes sense, but in some areas the cell values differ quite ...
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Creating New Field in Raster Attribute Table with Corresponding Values from another Raster

I have a raster layer that represents surface temperature for the State of Arizona. I also created a raster using the interpolation function to represent air temperature for the State of Arizona. I'm ...
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50 views

How to batch classify a multi-temporal raster image stack?

I am using dense time stacks of remotely sensed imagery to analyse vegetation change in the Arctic from 1984-2010 for one scene. I will be needing to classify each image, likely using the Maximum ...
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26 views

Best Management - Building, Site and Development Plans

We have thousands of scanned plans sets for various buildings, sites and developments that have been acquired over the years. The plan sheets are saved as tiff files and the entire plan set is saved ...
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different data range of raster file in mapserver and qgis

a NetCDF file with only one band with a data range from [0,1.1]. IDV & QGIS identifies it correctly, however gdalinfo finds the data range [1,26505]. Or could it be possible that gdalinfo is right ...
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28 views

Smooth and boundary clean raster (GRACE) Data

I have some GRACE data that I would like to smooth out and generalize/aggregate the boundaries to look like the maps shown at this website. I've tried playing with filters, converting to integers ...
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44 views

set extent for jpeg programmatically

I feel like this should be easy, but how can I set coordinates for a jpeg image using Python? I have a python add-in that draws a polygon and then uses its geometry to post a query request to a REST ...
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Extract values to point - values not being extracted

I have a single band raster. When I use the information select tool I can see pixel values. I also have a shape file made up of points sitting over the raster. I want to extract the pixel values from ...
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28 views

Image pyramid have wrong colors in Geoserver (but the tif-files looks fine)

Just want to start off with saying that I'm fairly new to geoserver and the fix to this may be very simple. So have managed to create an image pyramid out of a ~7 GB ECW file. The files are fine ...
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37 views

How to get transparent nodata values in GeoExplorer?

I have a single-band raster image with NoData values set to 0. Is it possible to get them transparent in GeoExplorer?
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74 views

Using gdal ReadAsArray or Arcpy.RasterToNumPyArray on python 2.6 32bit without it crashing

I am trying to run ReadAsArray on an entire raster and on a single band, python will crash without an error message when trying to do either. Is there a way I can create a 3d array without having to ...
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68 views

using r.volume model GRASS plugin in QGIS

I am calculating volume of bathymetric data in the form of a clipped raster in GRASS with a Custom Lambert projection centered around 70degrees North, using the module r.volume in GRASS. Side note: ...
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58 views

List of vector to one raster in PostGIS

Hi PostGIS developers! I need to rasterize a part of OSM map by coordinates. I found rather good algorithm, but can’t finish it. I have problems in STEP 3. I described all algorithm here – may be ...
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64 views

Making grayscale map from multiple band satellite image in ArcGIS for Desktop?

I have satellite multiple band map, I needs to make grayscale map,what should i do? what is the steps? which band and format of input are to be used in this? How to make attribute table of this? In ...
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67 views

Error on 'Extract raster values to CSV' in batch process in QGIS

The Extract values (csv) contained a bug in the script. The below link shows how to correct the bug. Error on 'Extract raster values (CSV)' - Error executing algorithm 1 'Dataset' ...
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50 views

What kind of methods are most commonly used to interpolate a relief?

I have got a topographic plan with height measurements which I converted to point shape file with height value in attributes. I was wondering, what kind of methods are most commonly used to ...
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39 views

Changing extent on a raster in QGIS

I rasterized a shape. The resulting raster (lets call it raster 1) has a different extent. I made a virtual raster with the original polygon and I tried to multiply the virtual raster with raster 1 ...
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42 views

ArcGIS Viewshed's show no visibility to south east

I'm using ArcGIS 10.2.2. I've been running some viewsheds using DTM files from EDINA Digimap and data that I've imported using .csv files. These files only contain the X Y details and a code for each ...
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Urban Heat Island USING ENVI

I have downloaded MODIS images for a specified area.. Its my first time that I am working on UHI (Urban Heat Island).. I need to know the methods to work on it.. I am using ENVI for this.
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39 views

TIMESAT input image requirement?

I tried to work on TIMESAT but always facing a problem. Here is the method I have used. Seems correct, but I get a warning at the end. I have created a NDVI file from ENVI 4.8 >> Transform >> NDVI ...
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43 views

Postgis Raster Unions Color Issues

Can someone explain to me what I am doing wrong here as I think I do not properly understand postgis raster bands. I have a set of geometries that I want to merge with a raster and created a raster ...
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GDAL WMS in QGIS 2.4

I'm trying to add in QGIS a layer shown here : propluvia When I watch in my console I see this request corresponding to the layer I need. The server is not able to respond to a getCapabilities ...
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Mapnik PGRaster Plugin creating 8x8 tiles with visible boundaries

I have used the latest addition to Mapnik PGRaster plugin (https://github.com/mapnik/mapnik/tree/2.3.x) by Strk(https://github.com/strk/mapnik/tree/2.3.x-pgraster) and merged recently. I am able to ...
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43 views

Multiply Rasters with Scalar Numbers as Input in QGIS Modeler

I built a little model in the QGIS modelbuilder which uses the raster calculator with the command gt(a,threshold) I need to run the model with varying thresholds from 2 to 30 so it would be ...
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55 views

Easy way to extract raster cells OUTSIDE a vector (Mask) layer in QGIS?

I have a raster file but am only interested in the cells outside a certain polygon. This polygon is very iregular and scattered across the raster. Is there any easy way to extract only the cells ...
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81 views

PostGIS Raster functions not working

Hopefully I have a simple question that I'm not phrasing correctly in google. I'm trying to learn about storing and producing rasters in PostGIS. There are tons of examples and documentation online ...
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121 views

Correlation between point feature (disease) and elevation

I have a problem! How can I calculate the correlation between point feature and Dem raster? Hypothesis: disease prevalence in high altitude is more than low altitude. I must do this in ArcGIS 10 and ...
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39 views

Problem with adding mosaic layer via arcpy

I have a mosaic layer that I want to add to my map in ArcMap. When I add this layer manually (i.e the "Add Data" button), a raster image, a boundary, and a footprint are added to my table of contents. ...
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Raster Calculator

I have a slope dataset. How do I calculate the real surface area for this slope dataset using the raster calculator. This is the example I was given: orthogonal area of a raster cell in square ...
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Polygonize Missing Polygons

Polygonize is not capturing all of the pixels in an image that has been converted to 0s & 1s. The pics below show -original geotif -geotif recalculated to 0s & 1s -polygonize output As the ...
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38 views

Conservation International Hotspot Data

I am creating a Heat Map and need Conservation Internationals's Biodiversity Hotspot Data in GIS form. I have tried to find the data online, but have since been unable. Where would I be able to find ...
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64 views

R{raster} getValues(): error accessing values of large raster

I am getting the following, while extracting all values with: rs<-getValues(rster) Error in getRasterData(con, offset = offs, region.dim = reg, band = object at data@band): long vectors not ...
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Weekly raster data for temperature and precipitation in US

I am looking for weekly raster data for US for temperature and precipitation. All the major datasets PRISM, WorldClim etc. are either on a monthly scale or daily scale. I was wondering if anyone has ...
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36 views

How can I preserve image quality when combining aerials of different resolutions?

I have two different rasters that were flown at different times during the same month. One has a resolution of 4-inches, the other has a resolution of 6-inches. Using ArcGIS tools, how can I combine ...
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107 views

Is there a Raster2pgsql GUI?

Has anyone ever attempted to create a raster2pgsql gui (like the shp2pgsql gui). As I am sometimes lazy to use command line, this could be a very nice to have.
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MapServer: UV_ANGLE not calculated correctly?

I'm following this example given on the MapServer website. But the angle of the raster is incorrect: The data is my grib files is correct, and should not yield these perfect opposite directions. ...
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PostGIS raster connection is not closed by MapServer

I'm using PostGIS raster in MapServer like this: TYPE RASTER DATA "PG:port=6432 dbname='mydb' user='postgres' password='1234' schema='public' table='truemarble' mode='2'" PROCESSING ...
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Import raster to postgis and add a foreign key constraint

I use raster2pgsql to import raster files into a table with this command line: C:\Program Files\PostgreSQL\9.3\bin>raster2pgsql -s 4326 -M -F -a c:\temp\mun.tif public.basqui_raster | psql -U ...
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Finding the best way to prepare raster image for a function in R

I'd like to ask what is the best way to prepare big raster images in R to run a function on whole images. I have 30 tiff images with the size of ncol=12648, nrow=4144. I read them in R separately. ...