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

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Getting raster values on grid nodes

I have my raster layers of Digital Elevation Model, aspect, slope and curvature for a certain region. In this region I want to apply a grid with a certain spacing in its nodes, and then get the ...
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44 views

How to write every raster from a list of rasters?

I have created a list of rasters - "norm" and run a several loops. Now I would like to write every created raster from "norm" (containing 1 layer) into one raster, having its specific name. # I can ...
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61 views

How to calculate areas in raster files

I got three files. The first is a shape file for country boundaries and the second and third are two raster files with the global land covers for 2005 and 2009. I'm thus encharged to calculate the ...
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1answer
33 views

How to change the raster format using QGIS translate?

I tried to change a raster format from .tiff to .asc using Qgis's 'translate'. As a result, I get 3 files: a PRJ, XML and a file without extension just a plain file... What could it be happening? I ...
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TIFFDirectory.getAsMetadata() is not including GeoTIFFTagSet. Any solution to this problem? — JAI

The source code appears to simply copy the TagSet List object to the IFD and then the TIFFMetadata. I don't understand where it is losing the tagset as it is in the list before the call. Anyone ...
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32 views

How do I summarize and then normalize the output of a kernel density surface?

I just finished generating a kernel density surface in ArcGIS 10.2. I would like to summarize the raster cell values as a histogram, and then potentially normalize the data. How do I: generate a ...
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1answer
120 views

r - increase speed of crop, mask, & extract raster by many polygons

I'm extracting the area and percent cover of different land use types from a raster based on several thousand polygon boundaries. I've found that the extract function works much faster if I iterate ...
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1answer
19 views

Raster Files Sizes from Point Data Extremely Different

Using ArcGIS 10.1. I created rasters from several groups of point rasters using the Point to Raster tool. All of the points groups are similar size and extents. The first group of points had a file ...
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3answers
39 views

PostGIS raster maximum number of bands?

Is there a limit on the maximum number of bands you can store in a postgis raster? I cannot find documentation on this. As far as I can remember, a geotiff allows up to the max short integer (so ...
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27 views

Efficiently working with converting vrt rasters to greyscale in QGIS?

I have large raster tile sets working well in QGIS (Ordnance Survey UK data). Sometimes I want to grey/fade these to make my data clearer to see. Attempting to access properties on QGIS for the VRT ...
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28 views

Using the accCost() function in R: questions regarding the transition layer

I am trying to use the accCost() function from the gdistance package in R. I load my cost raster using the raster()function from the raster package. According to the documentation, I need first to ...
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111 views

How to import multiple stacked raster images in R?

I have (I suppose) wery easy and silly question but I can´t really find my answer... I would like to import all multiple mosaic rasters (each mosaic is composed by 7 layers) from indicated folder into ...
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20 views

How to run GAM with raster package?

When I am using the raster package to predict a surface probability map of species distribution using the following functions in R, the following error occurrs: CA132122200=raster("F:/CBG ...
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3answers
46 views

Raster symbolization in open source web gis

We would like to build a simple web map application that displays raster data (e.g. a digital surface model) and symbolizes values (e.g. height) using a color ramp. Is it possible to have the user ...
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17 views

QGIS Export section from raster to AutoCAD

QGIS Windows 7 I have a raster which displays the flood depth over my site. What i would like to do export to AutoCAD an outline (maybe as a polygon or line) of the sections of the raster which are ...
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85 views

Is there an open standard for raster information?

For geographic vector data (Features) there is an OGC standard that defines geometries and their different annotations such as WKT and WKB. For raster image data however, I was not able to find ...
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1answer
106 views

Changing color of raster images based on their data values - gdal

Let's say I have 1 band raster images with Gray Color Interpretation and I want to change their color based on their data values. Data values -1, will be Blue, -0.5 will be Light Blue, 0 will be ...
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54 views

Calculate Euclidean distance to raster WITHIN multiple polygons

I am using ArcGIS 10.1 on a Windows x64 system. I am working in a study area where I have 360 000 locations of about 50 territorial animals. I have a shapefile containing 125 sometimes overlapping ...
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1answer
37 views

Export Geotif with transparent Background

i using Arcmap and i have a raster file, i need export this using a Geotiff file for use in Geoserver like a layer. My problem is, when i export the file always exist a color gray or white in the ...
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1answer
62 views

What am I not getting about JPEG 2000 coordinate systems?

I hate to ask this here because I suspect it is a very basic question, but after several days of scouring the web, I need some help with understanding JPEG 2000 imagery and coordinate systems. What ...
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1answer
73 views

Whats the best way to convert this tab data to a raster?

I have some grid data that is stored in a xls file. The rows are lattitude and the columns are longitude values in decimal degrees (see image). What would be a quick and efficient way to convert ...
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1answer
30 views

Error summing 2 different rasters?

I was trying to sum two different rasters and the final outcome is an error (image attached below)? The main goal is to sum the values of each pixel in those rasters (both raster files have the same ...
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1answer
38 views

Create raster with distance to feature

I'm new to GIS (and QGIS in particular). I'm trying to create a raster layer that contains the distance to shoreline for a certain region. I have both vector layers of the shoreline (line) and the ...
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1answer
62 views

Problems using r.reclass in QGIS: invalid reclass rule error?

I need to reclass some rasters, but i am having a couple of problems, i can´t generate a new raster with the reclassification using the r.reclass of GRASS. For the question here i´m using as example ...
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1answer
22 views

Calculate raster mode with r.mode - problem with decimals

I am working with a raster file that represents the percentage of vinyards by commune (e.g., municipality) in a region in France. The statistics were calculated for each commune based on surveys from ...
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170 views

Methodology for Hansen classification of Global Forest Watch?

I have just discovered amazing Hansen´s classification about forest loss and re-growth, available at http://www.globalforestwatch.org/, published in Science, 2013 as: Hansen, M. C., Potapov, P. V, ...
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1answer
45 views

Find local maxima with variable window search using ArcGIS Desktop?

I would like to find local maxima in different zones of raster file. I got five zones (zone 1, 2,3,4,5) and would like to find local maxima with different window search for each zone in arcgis ...
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61 views

Exclude Raster Cells with Value of Zero in ArcGIS 10.2 Raster Calculator Expression

I need to perform a simple calculation in ArcGIS 10.1 Raster Calculator. I am using a raster layer that contains many cells that have a value of zero. I need to exclude these cells in the expression ...
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3answers
85 views

Can I find out the exact areas which each category covers?

I have accessed a land use map and clipped the appropriate area I need to analyse. Is there a way I can find the exact areas which each category covers?
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1answer
50 views

ENVI 5: High resolution export of multiband imagery

I have to export some multiband Landsat imagery (Landsat channel combination 543) in high resolution in ENVI 5 for a Figure which I later will edit in Adobe Photoshop and Illustrator, best would be ...
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35 views

Clip .hdf (MODIS) rasters by shapefile

I am trying to do a temporal analysis on vegetation quality so I downloaded a MODIS .hds raster from earthexplorer. When I opened the file into ArcMap 10.2.2, it came as a group of 11 rasters. I stuck ...
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1answer
39 views

For loops + boxplot for raster

I have several Rasterstacks (b1_mask, b2_mask,...) of several layers representing only a determined pixel-intensity range. (So point "A" in some layers is "NA" - in others a "value" of that certain ...
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45 views

Extent from Centroids, Projection, and Resolution?

I have a file that defines a raster, although all the metadata was lost. I know the lat/long coordinates of the grid centroids, and that the grid is in a Mercator projection with a 1/12deg equatorial ...
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50 views

Arcpy script for summing pixel values in loop can't handle large number of rasters

I want to sum the pixel values of large numbers of rasters of different extents (ArcMap v10.2). 16GB RAM. I have the following code (with help from this site) which solves the different extent ...
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43 views

How to change values in a raster file at particular positions?

I have a collection of coordinates which comes from a QGSGeometry object. The shape is a polygon. example: qgsGeometry [[(75.2172,17.6566), (75.8499,17.9613), (75.5218,17.2113), (75.2172,17.4574), ...
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1answer
44 views

How to get a total amount of cells per classification type in a raster in ArcGIS 10.1?

I did an supervised classification for for this watershed. The attribute table doesn't have the count for total number of cell for each classification. I've created a field titled 'Count' with type ...
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1answer
49 views

Use field calculator to reclassify values from three different fields to populate a new field AND determine overlap with different raster

I want to reclassify values of 3 different fields AND determine if one of those fields is located inside a different polygon to populate the values of my new field. Everything is raster. I created a ...
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1answer
34 views

How to sum up values of neighbouring rasters? [duplicate]

I have a raster (25X25 meter) and I will make a new raster where each cell get the value of the sum of all the raster cells in a radius of 500m. I use QGIS. What is the best option to do this?
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QGIS Mac OSX version cannot batch write output files after rasterization

Happy new year everyone, I have been trying to batch rasterize a series of .shp files using QGIS for Mac OS X, and keep coming up against a strange problem. I am using the QGIS 2.6.1 user interface, ...
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27 views

Subset two rasters with different extent and origin (and resolution) only where there are data in both in R

in R, I have two rasters with different extents and origins (and possibly even resolution). How to efficiently take the subset of each of them only where there are data in both of them? Here is a ...
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0answers
45 views

ArcMap - Export raster symbology to a raster function template programmatically

I would like to programmatically export symbology for a raster dataset as a raster function template xml file, as can be done by clicking the export button in the symbology tab of the layer properties ...
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2answers
109 views

How to subtract rasters using the gdal_calculate command

I just want to know how to subtract two raster using gdal_calculate command? Or what is the proper way of subtracting using this? Any idea would be greatly appreciated. Note: gdal_calc is different ...
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1answer
49 views

Minimum and maximum values when raster statistics are lacking

How does ArcMap determine minimum and maximum raster values (e.g. for rendering colour ramps) when a raster file lacks an auxiliary file (e.g. aux.xml) describing statistics? This question is related ...
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59 views

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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1answer
17 views

Rastercalc.py and Rastercalcengine.py

Is there any examples on how to use the rastercalc.py or rastercalcengine.py? And what are the purpose of these python module? Are these modules the same with gdal utilities which can be run in ...
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1answer
37 views

Reference raster data outside of GeoServer data directory

is there a possibility to point GeoServer to raster data stored neither in a database nor in the data directory of GeoServer? My problem is that IT keeps me from direct access to the GeoServer ...
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47 views

how to use raster layer (map image) as base layer in geoserver+openlayers and vector layers on top of that?

I am using Openlayers + Geoserver for rendering data on India Map. I am able to do it. However, the India map generated from Opensource shape files doesnt look good. So, I want to use Better India ...
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1answer
60 views

QGIS “ERROR 6: No translation for Lambert_Conformal_Conic to PROJ.4 format is known.”

I am trying to clip a county DEM file using the PLSS Section shape files as mask layers... that is, I want it clipped to sections so that I can load my DEM into QGIS one section at a time, without ...
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1answer
53 views

Raster statistics - incorrect and apparently arbitrary minimum value

I have projected a raster with gdal as part of an R workflow: gdalwarp -s_srs EPSG:4283 -t_srs EPSG:3577 -r bilinear -multi -tr 1000 1000 -dstnodata -9999 in.tif out.tif When I add out.tif to ...
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1answer
48 views

Problem serving clean transparency with mbtiles in GeoServer

I'm running across an issue with the display of some historic line maps that I'm trying to serve as a WMS with GeoServer. I have created a mosaic of georeferenced line drawings in ArcMap, and I want ...