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

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Attribute table not changing when using Mosaic on rasters

I'm looking to "merge" 2 rasters together. One is the original base land cover raster with 6 classifications/land use classes. The other is a raster from converted polygons that are essentially "...
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28 views

Can't set transparency to a RBG raster on QGIS

I need to display an RGB raster on QGIS, with Multiband Color render type. After I set the Contrast Enhancement option to No enhancement, this is how the image is displayed. No issues so far, since ...
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I clip a raster with a vector mask in qgis, the result is correct but its a little bit of, why is this?

On one side the result is "bleeding" over the vector on the other side its more than one raster pixel from the vector on the inside. How to correct this? http://i.imgur.com/d0v6mqt.png http://i....
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27 views

Best way to store, elaborate and query raster data [closed]

I have created multiple raster images with GRASS-GIS (~150Gb), that I'll need to multiply for a certain coefficient, and query the results that need to by saved just temporally. The portions of the ...
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10 views

Adding .tif files with various bit depths to a raster mosaic

So I have a few georeferenced .tif files that I need to add to a raster mosaic, however the problem is that some of these are 8 bit unsigned TIFFs while others are 1 bit unsigned. After adding all ...
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46 views

G_Malloc error for Grass module(r.stream.extract) in R

I am having a big issue of this G_malloc Error while using a module of Grass (6.4.4) (r.stream.extract) in R. Initially I thought my computers configuration was low, So I switched to 8gb Ram 64-bit ...
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1answer
49 views

How to interpolate only cells in a raster that are adjacent to existing cells with a value

I have raster data of a continuous field. I need to calculate zonal statistics on that data for some polygons (e.g polygons A and B in the image). It is essential that I have as complete as complete ...
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55 views

Calculating flow distance of pixel from outlet using R?

I have created these raster files for a river basin: DEM Flow Direction Flow Accumulation Also, I have another raster with values of rainfall. All the 4 rasters have same spatial extent, ...
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1answer
76 views

can geoserver select one of many rasters from a postgis table

I have a postgis table with many different rasters in it. Is it possible for geoserver to grab only one of the rasters from the table based on something like a where clause?
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1answer
153 views

QGIS - Problem in visualizing raster - Raster disappears when pan or zoom

I'm having the following problem in QGIS 2.12.0. When I load a raster, this disappear when I pan or zoom in or out the image. If I try to do some actions three four times, it appears again. It seems ...
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1answer
105 views

Slope analysis of DEM in QGIS?

I have very strange problem with the raster analysis. I have a DEM as a Geo tiff and I do a slope analysis in QGIS. I've done this many times and everything was ok but this time I received reversed ...
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43 views

ArcGIS Online - Legend for raster/image (in web map, web map app, via Image service or other)

Is there a way to have an AGO map, or mapping application, with rasters than be symbolised in the legend? We currently use Image Services which load fine but cannot be listed in the legend - so the ...
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1answer
39 views

Making meter and Arcmin based raster compatible for analysis

I am trying to work with temperature and precipitation data from worldclim (Bioclim) and the Corine Land Cover data. however, the rasters are in two different grid sizes and formats, 2.5 Arc Min and ...
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32 views

Theory notions on exporting bufr data in geotiff format

I'm trying to export some bufr data from polar satellites/sensors like DMSP, ASCAT, ATMS etc in geotiff image. When my program rasterizes satellite data (brigthness temperature for example) by ...
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1answer
35 views

Per Cell Calculation

I have a population density raster data, but I'm trying to calculate the density per pixel? how do i go about this? working with ArcGIS
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103 views

Raster layer not visible after changing color rendering in Qgis

I created a new raster and it appears in the layer list, its visible on the screen and the values seems to be correct. When I change the "band rendering" from "Singleband gray" to Singleband ...
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1answer
74 views

Reclassify raster pixels underlying certain polygons using Python

I've got a shapefile with many polygons, each of which exactly overlays a contiguous region of raster cells; an example in yellow: For some of these, I want to use the polygon as a sort of analysis ...
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39 views

QGIS Time manager

I am trying to use the Time Manager plugin in QGIS to create a time series of some raster data. I get the following error message: AttributeError: 'QgsRasterLayer' object has no attribute '...
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32 views

Adding value in raster file from attribute table in QGIS?

I have a raster (in tif format) with one band (an ID number). I also have an attribute table with several fields(columns) for each ID number of the raster file. For instance, raster.tif: 1 band (ID) ...
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106 views

Unable to load raster from PostGIS into QGIS

I'm trying to load raster from a postGIS connection into QGIS, but I'm getting the following error: PG: dbname=EnvModel host=127.0.0.1 user=postgres port=5432 mode=2 schema=public column=rast table=...
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1answer
81 views

Applying a new colour scheme on GdalRasterLayer using SharpMap

I'm currently developing a surface water modelling system in C# (.NET) and am using the SharpMap control as my mapping component. It's all going well, but there's one thing I'm struggling with. I ...
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41 views

Create a Geotiff with different colors

I have a geotiff raster image. I have estracted the WritableRaster, the envelope, and the gridsampleDimension I need to create a new geotiff using Geotools. GridCoverageFactory gcf = new ...
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41 views

GeoServer: Use oracle as raster store without spatial extension

Is it possible to store raster data (e.g. GeoTIFFs) in an oracle table and access it from geoserver without using the oracle spatial extension/GeoRaster? I would store the images as blobs, but I don't ...
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1answer
134 views

Automatically detect the polygons(Buildings) In QGIS

Am trying to instal BREC plugin in QGIS 2.4 and 1.8 for the purpose of automatically detect the polygons(Buildings) from raster(TIF) file but i can't find that plugin, its not available in plugin ...
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45 views

What is the file format

I have been sent a text-file (see below) with '.txt' extension. I would like to process it in ArcGIS or any other GIS-tool. Unfortunately I do not know how to automatically load the file as ArcGIS ...
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27 views

Map Algebra with Zero-inflated regression weights

I have a non-normal count variable y and 6 rasters x1 to x6, each mapped onto a (n x n) grid. I have applied a zero-inflated negative binomial regression using the pscl package of R. I now need to ...
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61 views

What is the usefulness of the angle and direction of the sun parameters in hillshade? [closed]

These parameters refer to the angle as of elevation and direction of the sun hypothetically to the hillshade but why does that must have any importance?
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81 views

How to create 10 day averages of a multiyear daily raster time series?

I have a set of daily modis LST rasters (.tif) over a roughly 13 year period (2002-2015). I would like to group them by 10 day periods, i.e. bin 1 = julian day(jd) 0-9, bin 2 = jd 10-19, etc so that ...
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1answer
21 views

rendering issue when viewing polygons in mollweide projection

Arc10.3, windows I am using and etopo bathymetry raster with various polygon, line, and point layers over it. One of my polygons encompasses the north pole. This polygon automatically created a ...
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36 views

ArcMap calculate statistics every time I open jp2

I have jp2 raster files, every time i open one of these files ArcMap caluclate the statistics and histogram. Can I stop this I am using ArcGIS Desktop 10.3.1
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79 views

Extract By Mask Moving Pixels

I am creating some statistics based on certain values. The issue I am having is that the extracted values are not the same as the values in the original raster. This creates incorrect output, and I ...
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Exporting Raster inside a Feature Class [duplicate]

Using ArcMap 10.0 Trying to export a photo that has been taken with a device which is stored inside of a Feature class table. I have tried to export the data using "Right Click>Data>Export Data" This ...
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44 views

ArcGIS Javascript Legend widget does not show full color ramp

Has anyone used the legend widget with raster map services? I have created a GP service that returns raster maps, but the legend is incomplete. The ArcGIS layer properties are shown here, and below ...
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61 views

raster2pgsql stops at line 53 at RETURN

I am importing some very large rasters (in the tif format) into Postgres SQL (9.3) using raster2pgsql on the command line. Most of the rasters imported fine, some had to be converted to the img format ...
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1answer
58 views

Can't import multiple features or rasters into file geodatabase

I am trying to use the import multiple features into geodatabase option in ArcCatalog (ArcGIS 10.1). Or, similarly, I try to use the import raster option, which screen layout is similar to the ...
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2answers
148 views

Unstack band layers from raster

I have stacked layer (from ERDAS) of Landsat 1-5 and 7, bands. I want each of the bands in a separate layer. How can I do that?
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33 views

Automatically applying a local ortho projection using the center of the raster layer extent

I would like to take a raster image read the layer extents, extract the center point and then apply a custom local ortho projection with the origin set to the extracted center point. Can anyone ...
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32 views

QGIS raster: Which band is which?

I have an image from a Canon SD110 NIR camera, which I can import in RAW (CR2) into QGIS. However, I am finding it difficult to know which band represents which 'colour' output. According to the ...
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2answers
59 views

i.landsat.toar not working and returning error [duplicate]

First time using grass. I need to convert DN to reflectance. Imagery -> Sat. images tools-> i.landsat.toar. But when I add raster name. I get error. Im using landsat 8 images WARNING: WARNING: ESUN ...
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38 views

Subtracting rasters from each other in batch using ArcGIS for Desktop?

I am trying to calculate the maximum change for each cell in a large amount of rasters. These rasters are number X002,X003 till X150 and I am trying to calculate the change between 2 consecutive ...
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37 views

Select query St_asBinary(rast) returns out of memory for query result

I have very large rasters (7000x3500 cells) in postgis (2.1.3) postgres (9.3.4) that I want to pull down via psycogp2 and create numpy arrays and ultimately a geotiff. Initially I found I had to use ...
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3answers
57 views

Cut part of raster with another raster (mask)

I have a raster which I want to cut. A second raster smaller, should be exactly the part where I want to cut the first layer (so I cut the same size as raster 2). The idea is that raster 2 become the ...
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37 views

More control on raster colour maps? [closed]

I'm playing with various raster layers (DEM, geophysical data such as gravity or gamma-ray, etc). QGIS does a fine job at reading and displaying them, but I'm looking for more control on symbology, ...
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1answer
58 views

gdal_warp some geotiffs change SRS

Hello I#m quite new to GDAL. I have some Geotiffs that I want reproject. I tried that with one file and it works great, but because the TIFF has to be slightly rotated for the conversion I have some ...
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15 views

QGIS change zones in a raster to grayscale by polygon overlay

I've got a raster ortophoto and a polygon layer: I need to alter the raster layer as follows: Everything that is inside the polygon (overlaying) should stay as it is right now (in color). The ...
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1answer
17 views

Redefined Topo and Shape file still wont overlay

I am trying to overlay a topographic map that is a raster and a road shape file. The road shape file was originally not defined. I defined the projection to NAD_1983_2011_Contiguous_USA_Albers and I ...
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58 views

How to combine bands from different rasters using the global mapper raster calculator?

I am wondering how to specify what raster you are getting the band from in the global mapper raster calculator? When you open it with a more then one raster open you can check the boxes to define ...
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17 views

How to center the QGIS map on the maximum value of a raster?

I have a very large QGis raster layer showing the differences between two nearly identical rasters. Because of this, it is very difficult to find where in this layer the few pixels that are different ...
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87 views

Performance Scanning Big Rasters in GeoTIFF Format? [closed]

I am scanning large rasters in GeoTIFF format. The size is around 30GB and there is only one band. I'm using geotools to do that. I did some experiments on scanning the whole raster to find the best ...
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40 views

Layer failed to load?

I have this piece of codes running via pyqgis and trying to get raster layer from "elevp.csv". However, when executing this scripts it error kept returning "Layer failed to load". Anyone know how to ...