Clik here to view.
Modeler with raster calculator using QGIS
I'm trying to use the modeler in QGIS to calculate the NDVI on a raster image. The model is the one below:In the "NDVI Calculator" algorithm I have set the parameters like this.The model is working and...
View ArticleRaster Calculator in processing scripts crashes using PyQGIS
I am currently writing a processing script for QGIS that goes as follows:Takes in a digital elevation model (DEM) tiff file, a shapefile mask of the study area, and a slope cutoff value in percentClip...
View ArticleRaster calculator for wind turbine output
Information about the amount of wind energy is available from the global wind atlas (Downloaded from https://globalwindatlas.info/ ) and is available to you as the raster layer...
View ArticleDetrending DEM (QGIS)
I’m trying to detrend a DEM in QGIS. The best guidance that I could find on the internet was this question : Removing elevation trend over sloped surfaces?I couldn’t understand that so I would like to...
View ArticleClik here to view.
ArcGIS Raster Calculator Error 000539
I am getting the error-000539: Error running expression: rcexec(). I've seen that other people have this same issue but I am not sure how to fix mine. I just want to average the values of 10 rasters,...
View ArticleClik here to view.
Unable to view Raster Layers for calculation using QGIS
I am trying to put together a raster in QGIS 3.36 (and maybe convert to vector at some point) showing areas above 100 feet in NYC for calculating housing data. I have reviewed the SE...
View ArticleRaster Calculator returning NoData when using exponents on sinus
I'm trying to use the raster calculator to calculate:Power("sinSLOPE.tif",1.30)sinSLOPE contains values from -1 to 1 and no NoData points. The Calculator however returns a raster with values from 0 to...
View ArticleSpecify field of raster in Raster Calculator expression of ArcMap
In Raster Calculator I need to apply the next expression:Con("raster1%","field3")==Integer, Lookup("%raster2%","field3"),Lookup("raster1%","field3"))or more...
View ArticleHow to assign weights to classes of a raster image
I am relatively new to GIS and I'm working on a practical for the assessment of areas sensitive to desertification using MEDALUS Method. To obtain the Sensitive areas, I am to compute the geometric...
View ArticleClik here to view.
PyQGIS - Raster multiplication creates too large a file
When multiplying two rasters together using code in PyQGIS, the resultant raster is much larger than expected.Each input raster takes up ~ 11KB as .tif files, but when I multiply two together it...
View ArticleClik here to view.
Combining two different rasters with different extent and different precision...
I am trying to combine two rasters into one, so that I can better work on it as one topography layer. I need both, because the first (1) one has complete information on my focus area, while the second...
View ArticleUsing values in raster to extend a raster/polygon to contour/LiDAR value
I'm using ArcMap.I have a raster of flood levels (LiDAR + a water depth).I want to add 50mm onto the flood level raster which I can do with raster calculator.But then what I want to do is 'extend' the...
View ArticleTypeError: unsupported operand type(s) for -: 'str' and 'int'
I have 732 temperature rasters (366 min and 366 max temp) that I want to manipulate depending on if the max temperature was greater than a specified and constant crop category temperature. import...
View ArticleClik here to view.
Dealing with no-data values in raster calculator of QGIS
I am trying to patch two rasters with raster calculator but I am not finding the way to work with no-data values.Lager@1 has some information I need as first option, this has as no-data -9999 (reading...
View ArticleFinding average depth of filled sink using ArcGIS Pro
How to find out the depth of a filled cells (filled using "Fill" tool for a DEM)?I have a DEM (50m resolution) for which I used "Fill" tool of the hydrology tool of ArcGIS Pro to fill up all the sinks;...
View ArticleClik here to view.
Calculate percentile value of raster
I want to set null all raster values that fall below the 75th percentile value. E.g. If you classify the raster by quantile method into 4 classes I want to be left with the top 25% percentile. For the...
View ArticleSetting all pixels with value
I am using QGIS.I have a DEM raster with pixel values between about 3000 and -0.0003.I need to set all pixel with a value of 0 and smaler (<=0) to "nodata" (for later raster calculations and to...
View ArticleClik here to view.
Calculating urban areas that need pharmacies using QGIS?
I'm very new in QGIS.The task is to calculate the urban areas that has lack of pharmacies.I have buildings points with apartments count and existing pharmacies points. Then I made two raster...
View ArticleUsing Raster calculator to extract all cells that have one of number of values
I'm using QGIS 3. I have a raster layer for Koppen Geiger climate which has one band with values ranging from 1, 30. I want to make a new raster with only cells which have a value of the climates I am...
View ArticleClik here to view.
QGIS graphical modeler and raster calculator
I'm making a graphical modeler that creates me a kind of DSM, like that:I create a DEM for my extent (I have the DEM for my whole country).I have the Lidar for the height of the forest and I extract it...
View Article