Questions tagged [calculate-values]

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QGIS 3.10: Evaluate default values (data source preference) not staying checked on?

Anyone having trouble with "evaluate default values" in QGIS 3.10.1 preferences, under "Data Sources"? When I click the check box and then "OK", I go back to preferences it's unchecked! And default ...
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37 views

Calculate ID based on ID from another field

I have a layer with single lines and I have added a unique ID for each line. I have extracted the vertices of these lines to a new point layer and now I want to add a new ID for every point but based ...
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19 views

Help with “Calculate Values” Python expression (ModelBuilder)

I have a model and need to compute a new value from two other values upstream, and then feed the new value to the Kernel Density tool. Here is the formula I am trying to reproduce in the "Calculate ...
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406 views

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 ...
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529 views

Standard Method to calculate Average Moving Speed from Times & Coords?

...I wasn't sure if this question was best suited to GIS, SO or Math, so after reading GIS Topics I decided to ask here, but I'll relocate if necessary... :-) I'm working on automating various ...
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176 views

Calculating percentage of area from polygons inside one polygon in ArcMap?

I need to calculate percentage of different areas contained in one Cadastral parcel. Every parcel (polygon) is overlapped with one or more polygons. I need to find percentage of every overlapping ...
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249 views

Calculating normal vector distance between two surfaces using ArcGIS Desktop?

I have two surfaces mapped out from seismic data, imported as x,y,z datasets in ArcMap and then converted to rasters using the point to raster tool. These surfaces are rugose (seafloor and an ...
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37 views

Seeking arcpy.SetParameterAsText equivalent in ModelBuilder?

I know it sounds weird, but I would need a tool made with ModelBuilder that output two parameters: a layer a message (a string) The constraint derives from the need to share it as a Geoprocessing ...
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147 views

Zonal Statistics As Table with Very Small Polygon

I was given one single band NDVI raster and a shapefile with multiple very small polygons. The raster has a resolution of 3m. On the other hand, the small polygons on the shapefile are square shaped ...
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61 views

How to edit attribute with my result from the count

I need this to loop through all the OBJECTID for the Fitting layer. Then it get the count for every line feature touching it. Now I'm at the point where I need the attribute table to be edited with ...