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

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QGIS set default style for layers based on name

I know that it is possible to apply default fill/line/point and colour ramp styles for layers within a project, However... I have a model which spits out raster layers with defined names (e.g. ...
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Interpreting output from PCA tool of ArcGIS for Desktop?

I am looking for some assistance on interpreting the output from a PCA run in Arcmap. My data is comprised of 6 raster bands representing biophysical elements in the marine environment (SST, ...
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Resample raster to lower resolution

I am trying to resample a forest cover raster with high resolution (25 meters) and categorical data (1 to 13) to a new RasterLayer with a lower resolution (~ 1 km). My idea is to combine the forest ...
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Merging DEM file generted many negative value in QGIS

With four DEM files downloaded by Python Elevation package, I merged them in QGIS 2.8.3. I use raster-> Miscellanaous -> Input direction, no more attribute was added. The four dem data has ...
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How to calculate raster area or number of cells for multiple classes in a raster?

I have a raster with many classes and I want to know the area or the number of cells for each class. I found quite a few posts on this topic (see links below). None of the suggestions matched my ...
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25 views

ArcGIS how to geolocate/georeference raster data arrays?

How does one geolocate (or georeference) a raster of swath grided data with separate lat/lon arrays and multiple data bands using ArcMap 10.3? A sample data file (*.h5) can be downloaded from here ...
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Convert a SHP file set to a categorised ASC raster with Qgis?

I have a shapefile with regolith (soil) data that I would like to use as a categorised raster (say 007_1ASC) in Maxent. The regolith data is in the following files: 007_1.cpg 007_1.dbf 007_1.prj ...
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Geoserver Dynamic Raster Masking Based on Request Parameter

Is it possible for Geoserver to dynamically mask out values above or below a certain threshold in a WMS or WCS Geo-tiff request? For instance I make a request with some threshold parameter like 49 ...
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GRASS/QGIS- “buffer” created with DEM analysis- how to avoid it?

I have, to start, a DEM raster and a shapefile, with random created points, within a given polygon. The DEM raster was clipped with that same polygon. With the DEM raster, I used GRASS to perform ...
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KML with raster in QGIS

I have a kml file which displays correctly in Google Earth but only as a bounding box in QGIS . What can I do to see the associated raster image?
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How can I prevent gdal_translate from rounding coordinates when clipping?

I want to clip a raster (a VRT of several Ascii files) to a set of coordinates. Ideally I'd like to use gdal_translate to do this, but I only get an accurate result when using gdalwarp. gdal_translate ...
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Rasterize points in a map : result is not leasible. How to make the raster (points) bigger?

I have a vector layer (points) that I rasterized based on one attribute of the vector layer. I chose the GRASS GIS 7 command : v.to.rast.attribute. The raster layer appears in the map, but is not very ...
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Displaying raster images using Leaflet?

The purpose is to create a small web application using an open source product, preffered Leaflet (but I will Switch the product if it works within another Framework than leaflet), simply showing a ...
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31 views

Error executing algorithm Clip raster by mask layer 'NoneType' object has no attribute 'GetGeoTransform'

Processing modeler: GDAL "clip raster by mask layer" tool I have a raster layer that I wish to be clipped by a polygon layer (buffer zone). I intend to repeat to process many times in a more ...
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28 views

How to remove the Na values from a stack of rasters?

In R I have a stack (nsw.stack) which contains 6 variables. I have clipped the extent. However, When I look at the summary it appears that there is a lot of NA values (see below). I think this is ...
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25 views

QGIS Lost precision when converting raster to vector

I am after running ordinary kriging, converting raster to vector I lose decimal value and only get whole number. I have added first the raster then the vector image.
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Updating a raster using a shapefile [closed]

I have a huge raster file and want to increment all the values within a relatively small shapefile by 1 in Python. Speed is of critical importance, as I have to do this many times. I have been ...
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40 views

Multiple HDF5 files in single GDAL virtual raster

Does anyone know how to generate a single GDAL virtual raster linking multiple HDF5 files to each other? Each file represents different swaths of the globe with different lat/lon coordinates and data ...
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34 views

How to reassign Raster values to new values in QGIS?

For example, if the Raster has integer values ranging from -1 to 3 and the value that I am only interested in is 3, I then want to assign values -1 to 2 to 0 and then have the 3 value set to the value ...
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39 views

Statistical properties of raster image

I want to calculate mean and standard deviation of a raster image. In QGIS zonal statistics, we can calculate it within a polygon or a vector. But I want to calculate for whole image. In Python I'm ...
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clipped raster but attribute table not updated?

I have a nightlights raster file of India, and I clipped it using the block shapefile for India. After the clipping, the clipped raster files have the attribute of the original raster file. I want the ...
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2answers
44 views

How to make mosaic automatically from quadrocopter photos?

I have many aerial photos (not georeferenced) from a quadrocopter and I want to make a mosaic from them, but it takes so much time. Could you help me with this problem or give me advice on programs ...
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Interative raster with PostGIS

I'm searching some solution to show raster layers from PostGIS on a Web Page. I need a solution to build a interactive map showing the values of my raster data when the user to click on pixel of the ...
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raster::intersect not producing expected results

I am having trouble with R's raster::intersect method. I give intersect a SpatialPolygonsDataFrame and SpatialPoints as documented in the raster reference manual (p. 111). The result acts like it ...
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22 views

Unsupported Source

If I try to save a raster files from a WMS once saved tells me that the source is not supported, "Data Source not supported: /Users/beatriceluise/Desktop/wms/Senza titolo.tif is a raster data source ...
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33 views

Spatial correlograms for binary raster?

I have binary raster data (deforestation hotspot or not) that I would like to plot spatial correlograms for in R, to look at spatial autocorrelation over different spatial lags. I came across this ...
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40 views

PostGIS raster to UTFGrid

I am trying to create a UTFgrid JSON with a Raster in PostGIS. The goal is to provide weather data for web maps. I found some libraries: https://github.com/Ecotrust/create-utfgrids https://github....
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34 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
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21 views

How to “clean up” undesired values in a slope raster

I have a reclassified slope raster with 3 values in band 1. My problem is that I want to polygonize this layer, but the surface is so irregular with a lot of plots in terraces and because of this it ...
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65 views

Problem aligning historic map of Poland [closed]

I have downloaded a historic map of Poland. I am having a problem aligning it to a modern map. I have tried various methods and coordinate system using over 50 points, but nothing works. It gets close,...
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31 views

Combining Data from raster and polygon

I am teaching myself GIS at the moment, and there are still some matters I haven't quite got the hang of. I'm using ArcGIS 10.1, and have three datasets: LAYER 1: A population dataset at a high ...
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ArcGIS, Combine tool. Crashes once reaching 40% progress

I'm trying to combine 7 rasters containing soil related data. Rasters are 4.5G, give or take. All the rasters contain integer values. Once the combine tool reaches 40% progress, it stalls and arcmap ...
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Arcmap - raster positioning on the map

I work in Arcmap 10.3.1. I have raster dataset - spatial reference 3413 My problem is that I can not send this data on a map. Sequence: Add raster dataset Add basemap How do I display the ...
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How to integrate set of neighboring pixels in raster dataset?

I generated peaks of tree crowns as an individual pixels from DSM dataset, but there are some trees that have more than 1 peaks. I would like to integrate them based on the threshold value, for ...
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Swapped axes in R raster brick plot from netcdf

I am using the R raster package to import a tiny sample netcdf file, available here: https://www.dropbox.com/s/fht4g52p948vxva/persiann.ncml.nc?dl=0. The main data website is: https://www.ncdc.noaa....
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Remove raster pixel in R

This is the 32 year trend NDVI (raster data) I would like to remove the green grids data by using R (the green pixel value is larger than 0.03) and this one is R code that i use but i cannot ...
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R: how to export my Kriging result to raster? [duplicate]

I want to export results of my Kriging calculation to raster or some other format. My aim is to take this converted file and intersect it with another SpatialPointDataFrame (location of the point ...
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How to query raster in PostGIS within GeoJSON mask only

I have a raster in PostGIS which I need to query pixel values from, but only within a specific area. So I have a GeoJSON polygon within which I want to extract min/max/avg values of the raster from. ...
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R Freezes when Plotting Spatial Data Frames

I have run into a problem where anytime I try and plot a Spatial DataFrame in R, the console freezes, regardless of the size of the file. I imagined this must be due to an issue with the path to one ...
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27 views

How to get all pixel values of raster within a GeoJSON FeatureCollection in PostGIS

I need to extract all pixel values in a raster within a GeoJSON mask, using ST_Intersects. Attempt (throws invalid GeoJson representation): select row_to_json(t) from (select * from table_name where ...
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23 views

Error in rasterToPolygon trying to get several coverage layers

I have a very strange problem: I am trying to get a raster with coverage from 0 to 1 in each cell for types of vegetation, I started with a raster of vegetation type, but I needed a raster with 12 ...
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27 views

Zonal Statistic Tool

In ArcGIS, I have a grid 5x5km (I have it both in vector and raster formats) I want to calculate, based on this grid, the zonal statistic (MEAN) of a raster 30x30m pixel size. The raster overlaps ...
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Raster Precision QGIS

I am using r.patch extension in QGIS to join a number of LiDAR tiles, some of which overlap hence i am carrying out this task before utilising in a hydraulic model. R.Patch works fine, however the ...
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43 views

Generate ESRI grid with xllcenter/yllcenter in header

I'm trying to generate ARC/INFO ASCII GRID (*.asc) from point feature class using Create TIN - TIN to raster - Raster to ASCII functions. I'm looking for a way to have the output raster file header ...
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Selecting cells with values from DEM those are above specific value corresponding to each polygon?

i have a shapefile with 2000 polygons and a DEM. i want to calculate zonal mean for each polygon considering values from DEM which are above a particular value for each polygon. i want to it with ...
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Reclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGIS [duplicate]

I am trying to reclassify raster (DEM) in QGIS. I know how it is done in ArcGIS (Spatial Analyst, reclassify option), but I would like to know how it is done in QGIS?. The point of my exercise is to ...
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Convert a raster with one band into a raster with RVB bands on QGIS?

So yesterday i downloaded a raster tile on a WMS server and exported it with Grass. I get a raster with 3 bands, i treat with the Semi automatic classification Plugin in QGIS and it works perfectly. ...
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Polygon to Raster: Cells with multiple values

I'm trying to use R to rasterize a number of shapefiles and I'm having trouble dealing with cells on the edge of shapes, in other words the if a cell is partially covered by an NA value and partially ...
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Can raster maps be stored in a SQL Server spatial database?

Can raster maps be stored in a SQL Server spatial database? And if so, how? ... I'm aware of VARBINARY and FILESTREAM for images, but can only see GEOMETRIC and GEOGRAPHY for vector data
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problem with raster calculator syntax [closed]

I am trying to build a raster representing the output from a logistic regression model. i keep getting syntax errors. heres the script: -2.41-(15.97 * "Topographic_Predictors\wadem10m_annsolrad") - (...