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

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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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40 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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56 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
54 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
131 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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31 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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31 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
57 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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29 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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34 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
55 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
57 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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1answer
52 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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86 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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37 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 ...
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28 views

How to create a raster “grading” several different layers (polygons)

So I have a bunch of different shapefiles loaded into qgis: i.e.: - shape of poor soil quality - shape of cheap land areas - shape of poor weather areas now I would like to create a map which ...
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1answer
69 views

Add Color To GTiff output raster band

I am using GDAL in Python to create a tiff raster of data that is originally from a shapefile. I have an auxillary data channel, which I would like to use to color the pixels of the tif. I have made ...
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96 views

Kernel Density Estimation Crimestat

I calculated a series of Kernel Density Estimations in CrimeStat (because more parameters can be set than in the built-in tool in ArcGIS) and then imported the results into ArcMap. I wanted to combine ...
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59 views

Raster distance for statistical analysis

I am trying to some kind of hedonic analysis. I need to calculate driving forces for new urban areas. In order to do this, i have a raster with new urban area's and one with existing urban areas ...
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62 views

R raster stack 4 dimensions

I am trying to create a raster stack / brick from a list of ncdf files with the dimensions 160x160x24x1). r = stack(files) This gives me a raster stack but without the 4th dimensions which is ...
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56 views

Why does gdalwarp's cubicspline method expand into nodata areas?

The image below shows part of a peninsula on the Australian island of Tasmania. The black pixels are 9" climate data with GDA94 (EPSG:4283) SRS, projected by QGIS on the fly to Australian Albers ...
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1answer
128 views

How to merge vector buildings height layer with raster DEM to get solar maps in r.sun in Grass GIS?

Welcome, this is my first post. I have vector layer with buildings heights and vector/raster DEM file. I need to create solar maps with sun radiance values on the roof (and on surface, ofc). I am ...
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1answer
38 views

use zonal statistics for only some part of input shapefile

I have a district shape file (districts have different size) and a raster file of precipitation (18 km grid square resolution). I want to calculate precipitation for each district which I did using ...
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101 views

How add two coverages with different bounding-box and different resolution using geotools

I'm developing a Java application with some spatial analysis operations. One of the operations is to add two coverages. But how can I add two coverages with different bounding-box and different ...
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203 views

How to Convert from Point to Continuous Raster in ArcGIS 10.1?

I have a vector point dataset that I would like to convert to raster. The point-to-raster conversion tool creates a raster grid with spaces between each grid cell. I want to create a 'continuous' ...
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74 views

gdallocationinfo used in javascript with node-gdal?

I've been scratching my head for a white trying to figure it out if it's possible to get pixel information from my rasters using gdallocationinfo in javascript. I found node-gdal, but after reading ...
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1answer
93 views

Viewshed plugin in QGIS doesnt work

I loaded DEM and Point data and as a result i just got black raster (still black after calculation). If I click intervisibility I cant see it like if line data is not there. I tried changing meters, ...
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Rasters with duplicated data

I am working with a number of raster files that suddenly appear to have duplicated records. For example, I have a raster that classifies my study area into aquatic (value = 1) and terrestrial (value = ...
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52 views

Lat/Long grid array 360x720 for ArcMap raster layer?

I have two files (global temperature and precipitation), both in a 360x720 grid array (latxlong) in a csv file. I'm trying to add this to ArcMap 10.1 so I can use it in raster format. I've added the ...
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34 views

How to generate map tiles including world files in QGIS?

Is there any way to export bitmap tiles including world files from a QGIS project? I've tried QTiles but it seems not to support world files.
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1answer
105 views

Set NoData values to -999 in ArcGIS 10.3

I know how to set a value to NoData using SetNull, but how about the opposite? If I had cloud pixels in a Landsat scene that are currently set to NoData and I want to set them to -999 (an extreme ...
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Zonal statistics shifted

I am working with QGIS (newbie). I have a raster map with 0.5degrees resolution. I created a 0.5degrees width grid layer and I compute zonal statistics from the raster. My problem is that it seems to ...
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53 views

How to combine two different raster by replace its raster value at their overlap space? [duplicate]

I have two different raster data : First data : Second data How to combine those raster data? so the output data will be like this : Where the overlap space between First data and second data ...
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Is QGIS aspect analysis description mistaken?

I've been checking the Aspect analysis tool and several sources indicate that aspect is measured from 0 to 360, starting North and going counter-clockwise. Nevertheless, I've been testing it on ...
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121 views

Custom data source for GeoServer raster image

I'm working on a project where a custom binary data file contains latitude, longitude, and temperature data. I'm interested in creating a DataStoreFactory plugin to enable GeoServer to load this ...
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62 views

export several rasters from grass

I'd like to export 127 raster files from grass to .tif in one operation. I already stumbled over this post How to batch export using r.out.gdal command in GRASS but it doesn't work (I don't even know ...
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93 views

Subset moving window when using focal on raster in R

I have a classified Landsat image, and I'd like to pass a filter over it converting certain cells to 0. For some categories, I'd like to set cells to 0 unless an entire 7x7 window contains only that ...
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1answer
174 views

Save raster to file when using stack() in R

I'm working on a function for raster package. In the end of the function I have to use stack() to create a RasterStack. When I do this the data source is in memory. I want to have the data source on ...
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52 views

Raster Area within a Polygon

using ArcGIS, I have a layer of overlapping polygons and a raster grid underneath. The raster is not a continuous grid - the cells are spread out. I simply need to calculate the total area of the ...
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109 views

How to create contours from an IDW raster

I'm new to QGIS and am trying to create vector contours from this IDW raster. I followed Ujaval Gandhi's "Interpolating Point Data" tutorial step by step but am not getting the same results for step ...
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172 views

Performing Theil-Sen regression on raster data by R software

I have seven NDVI raster layers (in ERDAS img format) of an area. Each NDVI layer is the peak growing time of that year. I want to do trend analysis of NDVI values change over the years pixel by ...
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Assigning Raster Cell data to Point data

I have 23 sets of raster data for different types of habitat (which I have performed Block Statistics on in Arc10.2, in order to create a 1km grid). I also have 5 different Sets of point data showing ...
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71 views

How to align hundreds of rasters quickly

I'm hoping to accurately align hundreds of aerial images that are slightly off-kilter. The images cover the same area on different dates (several acres). They contain identifiable features around ...
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296 views

How to obtain an euclidean distance raster from a vector file in QGIS?

I'm trying to obtain a raster of Euclidean Distances from a vector layer I have of a river in Spain. I did it very easily with ArcMap using Euclidean Distance, but I don't know how to do it in QGIS. ...
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67 views

Where can I download a raster dataset with the latitude and longitude of each pixel in geographic projection?

I want to do raster calculations in QGIS based on the latitude and longitude of each pixel. The calculations will compute the area of the pixel, but also do other calculations for various projections ...