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

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450 views

Combine overlapping rasters in gdal_calc.py, taking the maximum value from each pixel?

I want to combine 3 overlapping rasters to create 1 raster. Each have the same dimensions, resolution and CRS. I want to populate the new raster with the maximum value from each of the layers. However,...
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9 views

random sample of raster cells based on multiple classes in R

I have a raster dataset that is classified into vegetation classes. I would like to randomly sample from the dataset based on the vegetation classes, but not sure how to do it. Here is some example ...
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1answer
31 views

GDAL Raster plugin doesn't work

I am connected to Oracle, using QGIS and can see the vector data table. I am trying to use the GDAL Raster plugin to view raster data, in QGIS. When I click on the Oracle GeoRaster plugin, get a ...
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26 views

ModelBuilder Iterator: change name output - SOLVED

I have several DEMs where I want to calculate their slope degrees. I used iterate rasters with slope tool and I put %Name%_slope as Output Name. The problem is the Name: it creates a file name too ...
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ArcMap 10.1 - Tabulate Area tool “doubling up” for Overlapping Buffer Zones

This question is related to a previous question I asked: Raster Version of Spatial Join (one to many) I used the Tabulate Area tool to crosstabulate values between an overlapping "buffrast" raster (...
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26 views

How to add legend to rasterlayer in Qgis2Web plugin while exporting maps?

Is it possible to add a legend for Rasterlayer directly from the Qgis2Web Plugin or do I need to add the code manually? I added an image of an example (DEM raster) and a Vector Layer. It doesnt ...
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22 views

QGIS “error: Grid file could not be opened” when filling sinks

When trying to run "Fill sinks" for SRTM30 data, there is a error and the log shows there was an "error:Grid file could not be opened". For the parameters: DEM: SRTM30 data; Sink route: [Not selected]...
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2answers
42 views

Splitting, disaggregating, breaking up a merged raster file

I am using ArcMap 10.4.1 but I am also more than familiar with QGIS. I have a raster file (single band) from a merged grid on population statistics for Europe (please see image attached). The red ...
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400 views

Use a WMS raster in ArcGIS 10 and combine it with vector layer

I have connected to a WMS server which provides raster images, more specifically, LIDAR surface elevation maps. I also have a vector layer which contains the outline of buildings. I would like to ...
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2answers
232 views

How I can sum 360 raster files in a folder with the Arcgis raster calculator?

In a folder I have 360 precipitation raster files and I want to sum them all to the raster calculator
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14 views

GRASS 7.3 r.fill.dir Does Not Create Output Raster

I am running GRASS 7.3 on Mac OS X El Capitan (2.9GHz, 8GB RAM). I have had to disable SIP in order to run it, but it works. I am hoping to perform some hydrological analyses on a few DEMs. My DEMs ...
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13 views

QGIS Atlas turning on/off raster layers

I'm attempting to create a series of maps in qgis atlas with the same coverage and background data but different raster outputs (flood mapping outputs for a range of scenarios). I've created a .shp ...
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16 views

How to use gdal_calc.py for multi-band images?

My problem is that I have multi-band images (8 bands) in GEOTIFF format and I tried to use gdal_calc.py to calculate a conditional expression between those bands. However, I could not make it because ...
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3answers
58 views

Create continuous raster from point values in 10.1?

I have a point dataset of nearly 400 points containing percentage values the point is representing Is there a way to create a smooth continuous raster surface across the whole of the UK of the point ...
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2answers
889 views

Histogram Matching using Python to improve mosaicking process of multiple overlapping rasters?

I am trying to do histogram matching using Python to improve the mosaicking process of multiple overlapping rasters. I am basing my code on that found at: http://www.idlcoyote.com/ip_tips/histomatch....
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1answer
4k views

GDAL RasterizeLayer does not Burn All Polygons to Raster?

I am trying to burn a shapefile to a raster using GDAL's RasterizeLayer. I pre-create an area of interest raster from a different shapefile, given a specific pixel size. This AOI then serves as a base ...
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14 views

Aligning Raster to polyline - Geological Fault

I have two rasters representing geological layer boundaries that are seperated by a polyline representing a fault. There is a significant offset between those two rasters. Now, at the fault, of course,...
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179 views

Converting raster presented in KML to polygon using ArcGIS Desktop?

I have spent quite a lot of time Googling which brought me many places including this site, but I haven't found the resolution. I have a KML that presents a PNG. Radio Mobile generated the files and ...
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1answer
58 views

Clipping of a Raster changes Range of Cell Values

I'm facing a strange problem. I created a mosaic of two landsat scenes which contains values from ~ -5 to ~11 (Biomass estimation). As my study area is much smaller then the mosaiced Landsat8 scenes, ...
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2answers
50 views

Clip raster with shapefile and set a value outside the mask

I want to clip a raster using a shape file with the command: gdalwarp -cutline INPUT.shp INPUT.tif OUTPUT.tif from this answer. However I want to set the pixels outside the mask to a particular ...
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1answer
198 views

3d arcgis raster .tiff image to CFD software

I am trying to export 3d raster image prepared in ArcGIS to cfd package such as Fluent. I was wondering if anyone has experience to convert raster image to autocad 3d format, stl, vrml or any other ...
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Research project on “carpooling recommendations” [on hold]

I am working on a research project on "carpooling recommendations". I want to simulate an environment where taxicabs with attributes (ID, current location of taxi ,number of passengers in taxi) will ...
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4 sequential Landsat image cant be merged into one single file, in QGIS. how to solve this issue?

i am trying to create land-use, land cover classification by QGIS. i have Landsat images downloaded from earth explorer. these are *.tiff files. but my region is not covered by single pic. thats why, ...
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20 views

Can I use georeferenced jpeg raster as map layer in GeoJSON.io?

Can I use georeferenced .jpeg raster as map layer in GeoJSON.io? I thought that I could, but it doesn't work. I converted .tif raster visualization of LiDAR data to georeferenced jpeg. After this, I ...
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2answers
30 views

How to efficiently extract time series from a very large multi-band GeoTiff in R?

First some context: I want to run a time-series analysis function that is only available in R for a continental sized multi-band time-series raster, which is stored in disk in GeoTiff format, that was ...
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63 views

Drawing concentric circles that correspond to free space loss formula?

I want to be able to draw a circle with 50km radius and then fill the circle with values corresponding to the free space loss formula below: FSPL(db)=20 log10(d)+20log10(f)+32.44 for example: a ...
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121 views

Error to add store through cURL REST API too geoserver

I have problem with adding raster layer to geoserver automatically. I need, that geoserver add layer without person job, only script action and i saw that it may be done with cURL REST API but, i can'...
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6 views

Raster cleanup eraser fail in ArcGIS for Desktop?

I am running ArcGIS 10.3 ArcScan and trying to clean up a raster prior to vectorisation. The raster was a three band raster converted to greyscale using the 'Greyscale function', classified into 2 ...
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2answers
57 views

Convert/display grayscale image as RGB

i want to display raster images using a color palette in a leaflet map. The images are tiled (gdal2tiles) from a single .tif to multiple .png files with values from 0 to 100. I add the image using ...
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23 views

In R's raster::terrain function, which way is north?

The terrain function in R's raster package calculates slope and aspect from an elevation raster: see http://www.inside-r.org/packages/cran/raster/docs/terrain. With the unit="degrees" option, the ...
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288 views

Exporting .tif from referenced mosaic dataset does not use functions in raster dataset

Very frustrating little issue in ArcGIS 10.1 -- I have a referenced mosaic dataset of terrain data that has a series of functions inserted (slope and several iterations of a statistics function to ...
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ArcGIS Online - Need to upload lots of raster files/georeferenced maps. How?

The end goal is to build a web application where people can explore the historical maps I've georeferenced - among other things. ArcGIS online is the ideal venue for everything else I want, but for ...
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25 views

Calculate exact percentile for each rastercell and create new raster with percentile values [closed]

I need to calculate the exact percentile value of each raster cell in a raster layer, in order to create a new raster layer with this exact (decimal) percentiles. (In excel this function would be "...
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1answer
295 views

What exact format do I need to have for the inputs to make Path Distance work?

I am trying to run the Path Distance tool in ArcGis 10.1. Ideally I would like to utilize Tobler's hiking formula anisotropic approach to slope and a land cover cost surface to calculate the least ...
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10 views

Raster to CSV with x y cell center coordinates, the original raster cell value, and values from another raster avoiding shapefile

I am looking for FOSS (maybe GDAL/OGR) solutions to a problem. I need to go from raster (200 million records) to CSV. It is easy enough to do via point but the point file breaks the allowable 2GB “...
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12 views

Single value of raster displays as transparent?

I have a GeoTiff raster that I'm trying to style, but a single value (1 of 8) refuses to take on any color. It always displays as transparent. Any idea of why this is / how to resolve it? Working in ...
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4answers
117 views

How to efficiently access files with GDAL from an S3 bucket using VSIS3?

So, GDAL has recently added a new feature that allows random reading of S3 bucket files. I am looking to crop GDAL images from multiple tiles of an image without having to download the whole file. I'...
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1answer
85 views

Cannot find information about my.table table in raster_columns [closed]

I am running PostgreSQL 9.4 and PostGIS 2.1 and have loaded a small piece USGS SRTM data for North America successfully into my database. I am attempting to export a small piece of of the rasters I ...
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1answer
65 views

How to create azimuth raster layer by pyqgis?

I want to create an azimuth raster layer base of single point shapefile, for this I write below code that create a memory point layer that each point in memory layer is center of each pixel and have a ...
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2answers
654 views

problem to open a netCDF and create a raster file

I want to open a netCDF file and create a raster with ArcMap 10.2. The file contains the mean monthly temperature for Switzerland. I found it in meteoswiss web site. I tried to open it with the ...
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1answer
81 views

Extracting Data from Raster based on Aspect Raster file

I have 2 rasters, ones shows aspect and another shows date of snow thaw. I want to extract the date of snow melt based on values from the aspect raster. For example I want all the snow thaw dates from ...
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1answer
965 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
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1answer
28 views

How to resize a raster SUMMING the values of pixels in QGIS?

I would like to be able to resize a raster such that the values of the resized pixels are based on the SUMS of the original raster pixels, rather than the averages. The output should be generated thus:...
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2answers
212 views

Suitable Raster processing methods to extract field boundaries from images

I'm trying to extract field boundaries and features from a lot of aerial images of agricultural land - and avoid digitizing these features manually. I've managed to get a crude raster file of the ...
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14 views

dismo::randomPoints generating fewer points than requested in R

I'm using the randomPoints function in the dismo package to generate sets of point locations within two polygons. I've converted the polygons to rasters, where the cells within the polygon = 1, and ...
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1answer
28 views

Self-hosted web app to view raster & vector layers and annotate

I'm trying to find a self-hosted web app that allows you to view a number of raster and vector layers on a draggable web map, and then to 'annotate' the map by adding points to the map with associated ...
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14 views

Rescale raster files in QGIS

I want to construct a surface of predictions in QGIS, using several probabilities I otained previously in R, by constructing GLMM. But I rescaled my variables before constructing GLMM, so I also need ...
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305 views

Calculate tree cover over certain area from raster data

Last year Hansen et al. published Global Forest Change map as set of raster data available in TIFF format. Basically those are 30-meters resolution satellite images with pixel values ranging from 0 (...
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1k views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
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1answer
219 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...