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

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How to visualize a C-band SAR sensor measurement

Files: \measurement\s1a-iw2-slc-vv-20141205t171642-20141205t171705-003587-0043c5-002.tiff Size is 24435, 13472 Coordinate System is `' Metadata: AREA_OR_POINT=Area TIFFTAG_DATETIME=2014:12:05 ...
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44 views

What is the replacement for 'setColorShadingAlgorithm' in QGIS 2.6?

I have been struggling with setting the colorshadingalgorithm for a raster layer in QGIS with no success for the past few days. The QGIS cookbook seems to be pretty outdated. Anyways, the code that I ...
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2answers
55 views

Using ArcGIS field calculator?

This field calculate returns an error, whats wrong with it? def Reclass(A): elif ( A>= 0.208113 and A <= 0.261517): return "Low" elif (A > 0.261517 and A < 0.301951): return ...
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1answer
19 views

How to add terrain information to an existing project in QGis 2.6? [closed]

I have created contour lines and a hillshade layers and saved it as a vector and as a GeoTiff file respectively. However, when I try to add these layers to an existing project, nothing shows up. Where ...
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1answer
44 views

Arcpy describe raster colormap

Does anyone know a way to use arcpy.describe to see if there is a colormap on a raster? Can't find anything in the help.
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42 views

GeoServer Raster Data Sources: satellite data's contrast issue

I am trying to use my own satellite image as the basemap for a webapp, instead of OSM, Google etc imageries. In order to do that, I made a Raster Data Sources store inside my GeoServer, which is ...
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22 views

Downloading data after clipping

I have an issue with downloading data from GeoServer after clipping layers: 1. I can download vector layers as GeoJSON and GML, but cannot download as shape-zip: file becomes corrupted; 2. I cannot ...
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2answers
37 views

GDAL - Warping raster to new domain/resolution/projection causes data loss

I am attempting to warp a GTiff from a lat/lon projection to a higher (~2x) resolution Polar Stereographic grid. In the output GTiff any cells north of 64 deg lat become NaN instead of their actual ...
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1answer
23 views

Merging Raster Images in MapInfo?

I have a bunch of MapInfo Tables in raster format (.tab / .grd) that I would like to consolidate into one table. Is this possible within MapInfo?
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19 views

ClipRaster Class of DotSpatial is problematic

I want to clip a raster data with a polygon extent. Here is my Layers. Polygon layer is colored and raster is black and white. When I cliped using ...
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20 views

Can a raster be projected twice?

I have to georeference a raster (tiff) twice. That is due to the limitation of control points I have. The first georeferencing works perfectly. The problem comes when I georeference the raster for the ...
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1answer
26 views

set cells with specific values as NoData in afloating raster

I have a raster file which includes floating values. I need to set cells with specific values as Nodata. For Raster integer values, the setnull tool can be applied, is it any tool for floating point? ...
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3answers
49 views

Making empty parts of aerial imagery transparent

I have a raster file (ECW format) that covers a very large area, however the contents comprise a thin strip of aerial imagery (100m strip centered over the rail line). The bounding box for the image ...
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1answer
38 views

Is the pixel aspect ratio of a raster dataset always 1:1?

When we are talking about rasters, is the spatial resolution of the pixel defined in a raster dataset always fixed to a ratio of 1:1, eg, 1m x 1m ?
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35 views

How much does relatively up-to-date 1 meter resolution color satellite imagery cost?

I'm starting to realize that I'll probably have to pay for good satellite imagery, and the sites I've been to so far want me to call them to ask for price quotes. I'm wary of this and haven't done it ...
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3answers
28 views

Appending interpolated or nearest raster cell value to vector point on a cell with no data?

I have been searching for a solution to this problem, but was not satisfied by the answer given in Finding nearest raster cell value based on vector point? I have some points that land on cells ...
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2answers
47 views

Calculating average raster grid values perpendicular to a barrier and transferring values to adjacent cells

I was hoping I could get a little help for 2 questions dealing with raster datasets. I have access to ArcMap 10.2 and ArcView 3 to do this. Here is what I am trying to do: 1) I need to calculate an ...
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11 views

Calling each pixel using spatial modeler language of Erdas Imagine?

How to call each pixel from a 4 layered raster image using while loop of spatial modeler language in Erdas imagine 2011? I need to consider each pixel as a 4*1 matrix and want to calculate the ...
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2answers
63 views

rasterize produces a raster full of NA values

I am having trouble converting a polygon to a raster. The desired raster is created, however all its values are equal to NA. require(rgdal) require(raster) #download a shapefile with 2010 census ...
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1answer
37 views

SRTM DEM with 16 bit signed pixel type changes to 32 bit float when creating slope/aspect/curvature

I have mosaiced 8 SRTM DEM tiles in order to get one raster layer of elevation. When I use "Mosaic to New Raster" tool I set as a pixel type format "16 bit signed" because this is the format that SRTM ...
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1answer
31 views

QGIS 2.6.1: “no enhancement” option not working on DEMs

When I import DEM raster layers and try to change the contrast to "no enhancement" I get a blank white image in the map window. Changing "black to white" to "white to black", the map remains a blank ...
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19 views

How to combine two `GridCoverage2D` to make a new `GridCoverage2D`

I was wondering if there is any GeoTools code example which combines two GridCoverage2D to make a third new GridCoverage2D? I can find examples for reading pixels from GridCoverage2D or writing a ...
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1answer
21 views

QGIS Web Client Raster not visible

I have loaded rasters from PostGIS and Oracle Spatial 11g with below script.Both layers are visible in QGIS Dekstop.My OWS settings are correct but the Oracle raster layers are not visible in ...
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1answer
30 views

Overlay a shape into a gridded shape and determine the percentage of each cell that are overlapped

I would like to know how I can overlay a shapefile (A) into another gridded shapefile (B) and extract the information about which shapefile (A) polygons falls in each cells (B). And, more ...
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33 views

How to define NoData values in the ArcPy Clip raster tool?

I'm clipping some rasters with the ArcPy Clip tool (from the raster toolset) and a polygon feature and I'm having some problems with nodata values. The script I'm using is based on the code from ...
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1answer
49 views

Wedge neighborhood on Focal Statistics calculation

I am using Focal Statistics in Spatial Analyst of ArcMap10.2, and use the wedge type of neighborhood for a radius of 10 km around each processing pixel. I want to calculate the maximum elevation for ...
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1answer
52 views

How to calculate zonal statistics from multi-band raster with no attribute table

I have a raster image (.tif) that is multi bands (35 band), floating point data type that does not have attribute table, and a grid shapefile of 107 polygon created by the fishnet function in ArcGIS. ...
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1answer
18 views

Is the PostGIS Raster primary key required to be named rid?

In all examples from the PostGIS Raster reference the primary key in tables with a raster column is named rid. I wonder if that naming is expected by any functionality of PostGIS itself or any client ...
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2answers
70 views

Export georeferenced image from AutoCAD to GIS?

I have an AutoCAD .dwg file that was assembled from scanned maps and is georeferenced. I would like to export it to use as a raster in ArcGIS. What file format should I use, that can be opened in ...
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1answer
62 views

DEM creation with C++ application

I am implementing a C++ application that must produce DEMs from LIDAR data. I am following the next workflow: Write .las files from lidar data. Use PCL algorithms to transform/filter the point ...
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1answer
25 views

Image classification from “Imagery” basemap ArcGIS 10.2

I'm trying to reclassify the coast of France and Spain into rocky or sandy categories. So far, I've been drawing polygons around the different patches, but want to try using image classification to ...
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1answer
31 views

Continuous raster legend in QGIS map composer

Is it possible to make continuous raster legend in QGIS? Something like in ArcGIS???
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1answer
48 views

How to get all band values with Identify tool of ArcGIS for Desktop?

This question is similar to Is it possible to always see all band values with Identify Features?, but is for ArcGIS. I have a multiband raster image, with more than three bands, and I would like to ...
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1answer
39 views

Adding PostGIS raster to QGIS via database manager

When I attempt to add a PostGIS raster to QGIS I get a GDAL error saying I need to set PGHOST. I have set PGHOST with export PGHOST=localhost but still get the error. How can I resolve this ...
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1answer
41 views

How to get values to create world file format?

i have researched regarding making world file format and tried to create one using c++ in windows, can somebody confirm if where i am getting the values from are correct? the literature regarding ...
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22 views

OSGEO/GDAL and Rotated Pole Grids

I have a netCDF containing a raster in a rotated pole grid. I have a script for converting the desired information to GeoTiff, however it requires projection information in the form of WKT string. ...
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16 views

Geospatially match cells of different rasters - possible?

I have 2 rasters that were originally vector polygons. Raster2 was created from a selection of raster1. After converting both to raster, their cells don't match up (i.e. attribute info for each cell ...
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1answer
17 views

Edit an old georeference raster projection in QGIS

I have created a map from a picture. And now I have some more detailed pictures and georeferenced them. Is there any way to quickly access them later on. I mean everything is fine with ...
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16 views

QGIS multiply(add) two raster but divide(deduct) another raster

I am making a parking analysis in one town. I need to obatin the zones where the parking of car is harder because there is less places to park and higher demand of cars.I have three rasters. First ...
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1answer
25 views

Load Oracle Spatial Raster using PyQGIS

Able to connect to Oracle Spatial 11g and print tables with SDO_GEORASTER attribute both in QGIS python console and standalone application.I get below error when loading rasters from oracle Table. ...
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1answer
29 views

Reading Raster Data with ArcGIS tools in C#

I have a raster data layer as IRasterLayer and I am using C# SDK of ArcGIS. Here is the IRasterLayer. I want to access all the cells I want to edit cell values. After all i need how can i read the ...
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23 views

Saving fields after a raster join with python arcgis

I am working on a raster processing script in which i join a categorical raster with a table that includes some extra data on each category. After much hassle, I have the join working, but I can't ...
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1answer
51 views

Calculation of focal statistics at the edges of the region

When I use focal statistics setting the neighborhood of each processing cell to be a circle with 800m radius (map units, not number of cells), how are the statistics calculated in the edges of my ...
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1answer
43 views

Load PostGIS or Oracle Spatial Raster Layer using PyQGIS

How do we load Rasters stored in PostgreSQL-PostGIS or Oracle Spatial 11g into QGIS using PyQGIS? I am able to load vector layers from Oracle 11g with below code. What changes are necessary to add ...
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1answer
15 views

Specify the NoData pixel from 255 to a lower value pixel value

I have a series of raster files (tif) that extracted using a particular shapefile. However, the output files became much larger (from 2 MB to 200MB). The NoData is now equivalent to pixel value of 255 ...
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1answer
22 views

gdal_grid - fails to find layer and field

I'm using gdal_grid for the first time and get this issue: gdal_grid -zfield field_3 -l layer0 OLEX-LAT-190952014.vrt OLEX-LAT-190952014.tiff ERROR 1: Failed to find layer 'layer0' on datasource ...
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1answer
28 views

Problem loading tif into raster dataset in ArcSDE 10.2

I have over 1000 raster datasets I need to mosaic into ArcSDE 10.2. I can't use a mosaic dataset because the county I am working for wants to keep the files on an external HD, so the pointers won't ...
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1answer
56 views

How to read *.adf files into R?

I want to load .adf files into R. The data is from this page: http://www.fao.org/geonetwork/srv/en/metadata.show?id=14057 I tried the following code that I found after some research in the internet. ...
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1answer
41 views

QGIS print composer export excludes one layer

I am trying to export a map from QGIS print composer but the resulting files (I've tried all image, .svg, and .pdf formats) do not appear as the map did in the composer. It is as if one of the raster ...
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14 views

View Oracle GeoRaster in ArcMap

I have imported SRTM DEM into Oracle 11g using FME.The block size is set to 128X128.I am able to view the data in QGIS,Tatuk and play with it using GDAl command line.Unable to view the same in ArcMap. ...