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Raster is a data format consisting of regular grids of values, usually stored in an image-like format.
10,148 questions
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How gdalwarp calculates pixel values when reprojecting
I would like to understand deeply how resampling and reprojection works in gdalwarp. To do that, I created an example GeoTIFF in EPSG:25831, reprojected it to EPSG:3857 while using the cutline option, ...
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Multicollinearity test for both categorical vector data and continuous raster data
I’m conducting a multicollinearity test on my dataset, which includes both categorical vector data and continuous raster data. The results show that two variables (Rainfall and TRI) have very high ...
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Creating/adding NLCD raster attribute tables in QGIS
I recently uploaded a raster from the NLCD (US National Land Cover Database) to QGIS. I'm trying to create buffer zones around different waterways to analyze riparian land cover. However the NLCD ...
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Simplify geometry originated from viewshed raster image
I am doing a viewshed analysis on a DEM .tiff file. I would like to convert the viewshed raster into vector geometry in the format of .geojson, which i have achieved, although, the result is not good. ...
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Morans I for binary raster data
i am fairly new to Moran's I and am currently trying to find out if it's even applicable to my data.
I have a collection of binary rasters showing the spread of Bark Beetles between 2018 and 2024. All ...
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True pixel size of the GLOBathy raster dataset
I've been working with Google Earth Engine's GLOBathy raster dataset.
I would like to know the cell size of the GLOBathy raster dataset.
I've downloaded several lakes of interest (AOI) to calculate ...
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Downscaling annual mean temperature from ERA5 data in Earth Engine
I'm trying to calculate mean annual air temperature at 100 m resolution by downscaling ERA5-Land data based on REMA mosaic, but something is wrong with the geometry settings.
// Set the time range
var ...
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Raster does not have same number of rows and columns that needs for prediction
I want to prepare an LULC prediction map of 2030. For this I have LULC of 2010 and 2015 along with the DEM, slope, and distance from roads and rivers as driver variables. Now LULC maps are of 24 m ...
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Reading and returning data from Excel into QGIS Raster Calculator
In QGIS, I have a raster with DNI values. I also have an Excel sheet that shows the Efficiency corresponding to each DNI value. I am running a procedure in raster calculator where I multiply DNI by ...
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How to sharpen/increase Landsat 4/5 images on QGIS
I frequently work with Landsat 4/5 imagery from 1994 and/or 1995 to evaluate land cover changes up to the present day, especially changes in natural forest cover.
Nowadays, I can easily use CBERS-4 ...
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Creating random raster with many bands and NoData values in QGIS
The task
For testing purpose (see here a scenario), I want to create a raster with many bands, containing random values. Some of the bands should contain NoData values for some of the pixels.
What I ...
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How to generate raster layers interactively through Streamlit
I am trying to create an interactive map through Streamlit running on Python based around a building footprint shapefile layer, where I can use these building footprint shapes to generate buffer ...
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Size difference between raster and vector with GEE analysis
I'm using Google Earth Engine (GEE) to calculate burn severity from Sentinel-2 data. I also have polygons of burnt areas obtained from the EFFIS database. I use the polygon ?n the GEE analysis to ...
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Remove NoData from SRTM exported from GEE
I use the following code to export an elevation raster with Google Earth Engine:
var countries = ee.FeatureCollection("FAO/GAUL/2015/level0");
var oman = countries.filter(ee.Filter.eq('...
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Creating local raster from web service using QGIS
I have an XYZ Tiles layer (AWS Terrain Tiles) that I want to extract an area from.
Since using Raster => Extraction => Clip on such layers does not work, I assume I either have to obtain a local ...
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