Which output data type to choose in QGIS SAGA Raster Calculator in Batch Mode?
I have 5 years of MODIS13Q1 NDVI .tiff images for time series analysis. I want to multiply all the images with the scale factor of 0.0001 before using them. In order to process all at once I try to use...
View ArticleClik here to view.
QGIS raster generation with defined grid [closed]
Is there a way in QGIS to define a grid and generate separate tiff files for every grid cell? Like in this matter:Open XYZ Tiles -> OpenStreetMap.Use a tool to define a grid over the interesting...
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.
Problems in calculate mean band values inside polygon
My goal is: to calculate the minimum, maximum and average values ​​of a raster band within a polygon feature, without using any library, only using PyQGIS: polygon_geom = polygon.geometry() extent =...
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 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 ArticleConverting floating point raster to vector
I'm trying to convert a raster layer to vector but I'm really struggling.First it says that I have floating points rather than integers so I have I have seen you can use raster calculator to multiply...
View ArticleAssign a value to a cell based on the elevation difference with its...
QGIS newbie here. I have a DTM raster layer and a river raster layer that shows location of rivers. I would like to first check if cell X is a river. If yes, check if any of its 8 neighbouring cells is...
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 ArticleClik here to view.
Identifying and quantifying gullies and hags from aerial imagery in QGIS
We are involved in an extensive peatland restoration project in the Shetland Islands. We provide high resolution and accurate digital surface models and orthomosaics for initial analysis and on-going...
View ArticleClik here to view.
Terracing and data format issues when converting DEM from float32 to UInt16
I have spent quite a bit of time trying to figure this issue out; I was hoping someone on here could give some advice on what to do. I am having issues with terracing on my 3D model in Blender and I...
View ArticleClik here to view.
Can't normalize [closed]
I'm trying to normalize a raster, and when I click run it says error in the formula, without spicifing, what could it be?
View ArticleUsing maximum and minimum operators in QGIS Raster Calculator
I would like to normalize a raster, using the raster calculator in QGIS 3.x, but I don't know how to use the maximum and minimum operators. I have tried the following sequence, but it does not...
View ArticleSetting raster outliers to nodata in QGIS
For further analysis, I want to exclude raster outliers (mostly single pixel values).Therefore, how can I set global raster outliers (e.g., mean +- 2*sd) to nodata value in QGIS?
View ArticleClik here to view.
Raster calculator window without specified layers from graphical model
Several years ago I've created a graphical model (still works), where used a raster calculator algoritm. It was easy to add layers into the expression since all the layers from the model were specified...
View ArticleCalculate the mean of files generated from gdal.Translate
I created several velocity maps from .nc files through gdal.Translate. Each .nc file is organized in several bands, I am only interested in 1: velocities. gdal.Translate allows me to select only the...
View ArticleClik here to view.
ENVI band math incorrect values
I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math.The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge...
View ArticleCan I use Map Algebra expressions to build all Mathematical Morphology...
We want to apply classic mathematical morphology operations in Raster objects. A typical Raster-GIS implements Map Algebra, like PostGIS's ST_MapAlgebra_expr."Focal operations" of the Map Algebra...
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 ArticleHow to use Map Algebra expressions to build Erosin and Dilation operations?
PostGIS's ST_MapAlgebra_expr (focal operations) seems a good canditate to implement Erosion and Dilation operations, that are like the vectorial counterpart ST_Buffer (positive and negative).It is not...
View Article