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 values from raster at points with many different rasters and points

I have a folder containing 100 DEM rasters. I have a point file containing thousands of points. I need to collect raster values at all of these points. Only some of the rasters intersect with the ...
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3answers
672 views

Plotting Netcdf data. How to get right projection?

Maybe it's very easy for someone to fix, but I'a a new one in R, so I really need help. I/m trying to plot data containing lat, lon and variable (nmf2). The grid isn't a regular one, so there are some ...
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120 views

Explaining ArcGIS Raster to Polygon output?

I want create a new shapefile with selected fields found in a raster which depicts landcover. I first attempted to run Raster To Polygon. However, some class names no longer appear, as shown here: ...
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53 views

Adding polygon attribute to a gdb raster

I am working with the gSSURGO soil database which has many tables with data and one raster file. I managed to join the tables to the raster, so now I click on my map and can see all raster attributes. ...
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65 views

Get Raster Values from a Polygon Overlay in ArcGIS

I have the same problem as Curlew in Get Raster Values from a Polygon Overlay in Opensource GIS Solutions and thecrashlandingdodo in Step-by-step: How do I extract Raster values from Polygon overlay ...
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888 views

Converting DEM to Floating Point Raster (FLT) using QGIS?

I am looking to convert a .DEM exported from AutoCad to a floating point raster file type (.FLT) utilizing QGIS to implement in HEC-RAS Mapper. This is accomplished easily in Arc using the ...
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35 views

Pixel based transparency or “Lighten” on geoserver

This is similar but different from this question. I'd like to statically assign a transparency of one raster based on another raster. For example, say I had a raster of aspect in a spectral gradient ...
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1answer
115 views

How to make maps out of imagery?

I am working for a client and we chose to use OpenGeoSuite as our system. Our client will be flying a plane over farm land capturing images that we need to put in our system. From my understanding ...
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135 views

Add QGIS raster layer to Google Maps API

Is it possible to add a hosted QGIS Raster layer into a Google Map? Thanks.
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63 views

Problem with QGIS raster interpolation from a point shapefile after duplicating the shapefile

Let me explain a problem I had with QGIS to see if somebody else has experience it. I created a raster from a point shapefile through the Raster-> Interpolation menu with no problems. After that, I ...
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2answers
115 views

Extract from raster by tightest rectangle mask without Nodata

I'm using ArcMap 10.2.2 and I have a raster that has Nodata around the edges. How can I extract the tightest rectangle from this raster that does not include Nodata? The screenshot may help ...
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100 views

chi-squared for two rasters in R

I am kind of new with statistics. I have two raster with categorical values and I want to get chi-square. How can I do this using R? Rasters have the same region and same resolution. Is chi-square ...
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153 views

Automate Exporting of Rasters Using Renderer in ArcGIS

It is possible to export rasters in ArcMap by right clicking the layer-> Data-> Export: You can then click 'Use Renderer' check box to ensure the image you export uses the current ...
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0answers
58 views

Euclidean Distance with Weighted Values

I am currently dealing with a dataset which consists of about 2700 points stochastically placed in a study area of about 650,000 sqKm. I am trying to create a distance raster for these points, which I ...
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0answers
248 views

Problem to visualize raster data from PostGIS in QGIS

I have two multiband raster files and i'm trying to load these data into PostGIS using raster2pgsql. Here is the syntax that i used: raster2pgsql -c -s 4326 -I -t 100x100 *.tif ...
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28 views

Merging rasters in Openlayers

I'm using Openlayers 2.13 and GeoServer 2.5.2 and I want to merge rasters. After short searching on Internet, I haven't proper, not even close, solution for this. How can i handle this? Thanks in ...
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1answer
273 views

Using Polyline to Raster tool in ArcGIS

Pretty basic question; In this Polyline to Raster tool, there is a field called "Value Field" I am not sure what to put for this field. My polylines are ZM, so there is Z information for the line, I ...
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1answer
75 views

Clipping a Raster into 5x5(25) equal tiles through the use of arcpy?

I am curious to find our if there is a way to create a python code that enables you to clip a raster into equal parts example: 5x5(25) tiles with the use of arcpy? From what I can think of you would ...
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1answer
78 views

QGIS raster from interpolation not scaled correctly

I am using the interpolation plugin in QGIS to interpolate values within a boundary. I start with two layers; 1) my points and 2) a polygon for the area of interest. Then I go to ...
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1answer
35 views

ClipRaster with three inputs

1) How can I clip raster with checked "Use Input Features for Clipping Geometry? I don't want to specify X, Y Min/Max for the Output Extent. I want to run a simple Clip Raster script that includes 3 ...
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34 views

Is it possible to create a web application that can clip raster images using vector layer shapefile?

I need to create a web application that can navigate through the world or even single country and let the user draw or upload polygon shapefile to clip raster data according to that drawn or uploaded ...
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1answer
226 views

True color combination using Resourcesat-1?

I am working with an image from India. According to the metadata, I am working with an image acquired by the AWiFS sensor from Resourcesat-1: ...
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2answers
92 views

Computing View Distance in One Direction from Point on Elevation Raster in PostGIS?

I'm a software developer just getting into GIS, so please forgive me if I don't use proper lingo, or if I use proper lingo incorrectly! I have a raster of elevation data. For a given point in the ...
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165 views

Does interpolation create a vector or raster?

I have been reading about interpolation and am trying to understand whether interpolation results in a vector or raster. Say I have a layer of points and I am interested in creating a raster that fits ...
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1answer
155 views

Is it possible to add a raster file as layer from an URL?

I have several geoTIFFs stored on a server that I can access through http. I would like to add them as raster layers analogous to adding a local raster file through the "Add Raster Layer" button, but ...
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1answer
29 views

Combining several raster files generated from polylines

Maybe I'm just missing the point somewhere... I'm working on a path distance analysis, specifiying the cost layer. For this I have built a model, where I have roads and trails, both polylines, that I ...
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1answer
173 views

The truth value of a raster is ambiguous. Invalid use of raster with Boolean operator or function.

I'm having trouble with an if/else statement in my for loop. I have a raster Vmax with a constant value, another raster V which has a value of 0 in the beginning and will change during execution of ...
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2answers
127 views

Convert from shapefile or raster formats to LAS (preferably free)

I am looking for a solution to convert either from ESRI shapefile format to LAS or from a common raster format to LAS. I have access to following software: ArcGIS 10.2 for Desktop (arcinfo with ...
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2answers
101 views

Merging raster data in QGIS using wildcards

I have a problem merging raster data sets in QGIS, and I have searched various forums, but have not found a solution yet. An "ordinary" merge, for example merging the raster files ...
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1answer
194 views

QGIS georeferencer: Thin Plate Spline (TPS) residual

1) Is anyone able to explain in simple manner what does mean error exactly mean? I use metric values, so suppose 3.64109 is expression of meters and "e" is mathematical constant: ...
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2answers
182 views

Dealing with NoData Values in Arcgis

I have a set of rasters which I want to calculate mean of them,these rasters has some NoDate values,I have two approaches first using this code in raster calculator I interpolate them ...
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2answers
423 views

Combine overlapping rasters and include cells with no data

I'd like to combine about a dozen rasters into one raster that contains the "summed" cell values where overlaps occur. In doing so, I need to be able to retain cells that either have no data, or that ...
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1answer
98 views

Coordinate system ID ArcGIS

I have satellite image files with metadata generated from ArcGIS: Raster Download Information Coordinate system ID WGS84: 4326 Top edge WGS84: 35.0003681085064 Degree Bottom edge WGS84: ...
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164 views

Removing salt and pepper effect

In a land cover raster (categorical map) that is a product of classified satellite image, what is the best way to remove "salt and pepper" effect from the image after classification. I am not ...
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1answer
322 views

Conditional statement, apply different equation based on raster value R

I am trying to find the best way to apply a set of equations to a raster conditional on values in a separate raster. For example, suppose r1 has the values of interest and raster 2 (r2) is a raster ...
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1answer
196 views

Convert a lat, long, value table into a raster

I would like to to convert a table with latitude, long, and a value into a raster. My file looks like this: X Y Z 32.85138942 -6.643054718 0 32.85138942 -7.059721474 1004 32.85138942 ...
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1answer
62 views

Loading Raster using QGIS API in Windows

I am trying to develop a C++ application using QGIS. I have to load a tif file and show it. First I wrote an app similar to samples on the internet. It works on Linux, but it does not work on ...
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1answer
219 views

QGIS 2.8 Convert a vector to a raster layer

When I change a vector layer to raster using raster button->converse->Vector rasterization in QGIS2.8. I get only a black picture. Why is that so and how can I convert a vector layer to a raster ...
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1answer
29 views

How to turn a vectorgraph into raster correctly?

In QGIS2.8 version, I added several points in a point vectorgraph. When using the grid - > Conversion - > rasterized vector , The results turn out into a black figure. How to turn a vectorgraph into ...
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1answer
250 views

Qgis raster calculator not giving output

I want to calculate some result using QgisRasterCalculator and using the code mentioned below.Problem is i am not getting any output raster also if i use this formula in raster calculator it gives ...
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2answers
60 views

How to compute climatology of 3 days moving averages for rasters pixel by pixel?

I have one year of datasets that I want to compute the climatology of 3-day moving averages and then I subtract this climatology from the original values for each pixel. example: # Set up the ...
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80 views

Overlay polygons on raster in different projections

I'm overlaying polygons on a raster to get the average value inside the polygon (using SAGA->Shapes-Grid->Add grid values to shapes in the QGIS Processing Toolbox), using a geographic and a ...
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56 views

Project Raster Data Loss - 2 Billion People

I am using the SEDAC/CIESIN raster data for population counts. This data is in WGS1984, and I want to project this data to a Fuller projection. After running through "Project Raster" in ArcMap 10.1, ...
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1answer
49 views

Raster Calculator or Local-Combine tool? (in ArcPy)

i have 3 classified rasters and i wanted to use the following query from r. calculator: (rclslope>=45) & (rclmosaic>=2000) & (rclfocal>15) to arc.py how can i write it? Is it ...
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1answer
141 views

QGIS how to save loaded min/max values for raster layers?

I am working with many layers. Each time I open my saved project, I must reload the min/max (properties/style) values. Is there a way to turn off the default 2% cut?
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313 views

Reprojecting a raster image using gdalwarp

I am trying to reproject an ECW Orthophoto from 25830 to 23030 srid. I tried the following but I am getting an error: C:\Program Files (x86)\FWTools2.4.7>gdalwarp -s_srs 25830 -t_srs 23030 ...
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1answer
305 views

Creating an R factor raster in RUSLE Soil Loss equation with multiple input rasters

I am attempting to obtain the rainfall erosivity "R" factor for the RUSLE Soil Loss equation using rainfall PRISM 30 year history data. I have both monthly and annual data that comes into ArcMap as ...
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188 views

OpenLayers/Geoserver - can I create a tiled, zoomable raster layer?

Still a relative newbie with Geoserver and OpenLayers. Developing an application with Geoserver in the back, OpenLayers (3.0) in the front. I have a requirement to display imagery on top of a base ...
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20 views

Reprojecting a ECW raster with fwtools [duplicate]

I have a ECW Orthophoto and i want to repoject it from 25830 to 23030 srid. I haven´t found a free software to do this but i heard of a command line utility called FWTools that could do the job. I ...
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1answer
565 views

QGIS SAGA Raster Calculator [closed]

I am using SAGA --> Grid Calculus --> Raster Calculator on QGIS version 2.6. The formula I am using is: ifelse(gt(a,0), (a), b) where a is my layer with values in a greater extent than that of b. ...