Questions tagged [inverse-distance-weighted]

Inverse Distance Weighting (IDW) is a method of interpolation.

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WEKA for IDW evaluation IN QGIS

intento evaluar una interpolación IDW realizada en QGIS y desconozco la manera de validar o evaluar su ajuste (y con cuales herramientas). Pero he descubierto WEKA como una alternativa para la ...
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AERSURFACE - How to calculate the inverse distance weighted geometric mean of surface caracteristics

I need to calculate the inverse distance weighted geometric mean of the cell values of different sectors within the 1-km radius from a weather station, using QGIS. I'll try to make it clearly below ...
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QGis GDAL Grid Inverse Distance to a power - Grid Size

When I run this function from QGis on a point shapefile, there is no option to determine the grid pixel size / resolution or dimensions. Am I missing something here?
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For-loop to call fields for IDW-Interpolation

probably a question easy to answer, but I do not figure it out at the moment. I'm using station-data and do a IDW-interpolation to get average climate values in layer. The station's data is arranged ...
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IDW interpolation using QGIS?

I want to obtain the quantity of precipitation for each municipality in Brazil on a given year. For that, I'm trying to use IDW interpolation on QGIS to interpolate the precipitation data from weather ...
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229 views

IDW/Kriging running slow in R

I have a dataset with 2157335 entries, and I am performing IDW/Kriging to interpolate. But the code is running very slow. I am not sure this is because of a large dataset or there is something wrong ...
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Cross-validation error threshold in ArcGIS

I'm learning the Geostatistical Wizard toolset in ArcMap 10.4.1 and I am performing the cross-validation step in an IDW interpolation. I have done some research regarding the process of cross-...
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181 views

Understand ramp color interpolation using QGIS 2.12

I try to understand the color ramp in TIN and IDW interpolation. I work with height points layer. The low value in 8 and the highest value is 584. With the interpolation plugin i create TIN raster ...
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How to create contours from an IDW raster

I'm new to QGIS and am trying to create vector contours from this IDW raster. I followed Ujaval Gandhi's "Interpolating Point Data" tutorial step by step but am not getting the same results for step ...
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Strange interpolation with natual-neighbor method

I have base shapefile and try to use different interpolation methods to get image like this: This layer is constructed using point to raster conversion. Generally, interpolation methods as idw and ...
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Looking for a tool like (IDW) for raster

I am looking for a tool that gives the same outputs like the IDW, but for rasters instead of points. I have a Corine land cover raster layer in ArcMap 10.2 with different friction values, displaying ...
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241 views

Using ArcGIS Getis Ord Gi* and IDW tools with “hotspots” where unmeasured areas are “coldspots”?

I have two datasets that I would like to analyze together. The first dataset has bird nest locations in neighborhoods (nest). The second dataset has bird feeder locations in neighborhoods (food). At ...
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R-ArcGIS Bridge - Interpolation with gstat library

I have a problem with the idw or krige function from the gstat library in R. I'm trying to use the gstat library and the R-ArcGIS bridge to load a shapefile from ArcGIS into R, interpolate the data ...
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Calculating IDW over Geostatistical Wizard in ArcGIS Pro

In the course of a task, the IDW must calculate for a data set. The dataset consists of a total of 60 points. Unfortunately, I can't get any further with one of the settings. It says, the min and max ...
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QGIS: IDW interpolation doesn't work?

Beginner user of QGIS: I used the tool called IDW Interpolation from QGIS. In the picture below you can see how I did it, with vector points imported from a CSV file. However the OUTPUT is completely ...
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Performing IDW interpolation with an output weighted by a different variable

I'm relatively new to spatial analysis. I'm trying to create an IDW map for SPI. However, I'm "correcting" the SPI so it gives a different value based on elevation. For example: Point A on the map ...
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Skip intermediate raster creation in interpolation model

I am interpolating values at specific coordinates. I am starting with point data and am using ModelBuilder so I can generate interpolated values for each day. The model (1) iterates through each row (...
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Using IDW in ArcPy script gives ERROR 000824

Using ArcMap 10.4 and Python 2. On ArcMap, I have the 3D Analyst and Spatial Analyst extensions checked out. I manually ran the IDW tool on a points feature class, and I was successfully able to ...
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Can non-elevation data be displayed in 3D? Such as EC measurements in soil over a surface?

I tried creating a tin in ArcScene with a raster I have from an IDW file of salinity at sample points in a field, but I can't get it to display as anything other than flat. My points range from ~1-40 ...
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32 views

Splitting polygon by sections obtained from IDW interpolation

I used IDW to show the rainfall pattern over a region ... the attached picture show the result ... my area split into three ranges that show 3 different colors... How can I split one original polygon ...
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IDW succeeded but not visible in table of contents

I used now several times ArcMap 10.7.1 and until now everything worked quite well. For my Masters Thesis I have to work with IDW to interpolate my datas. It worked all the time. Now, I run the IDW ...
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IDW of Points Converted from Rasters giving error message IDW [000000_12301899]

I've been attempting to create a DEM for a larger area from the available DEMs of a smaller area (portions of the larger area). I converted the DEMs to points and then merged then to one file so that ...
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1answer
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ArcGIS IDW interpolation elongated?

I am trying to do a very simple interpolation with soil nitrate data. I wanted to do IDW because points close to each other should be most similar. I used the IDW interpolation function in ArcMap (...
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1answer
329 views

Kriging method vs. IDW in soil moisture interpolation

I have XY coordinates and soil moisture values for a grid of 10m and I used add XY data to import my excel data to ArcMap 10.5. I applied both IDW and kriging methods for interpolation. The results ...
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320 views

IDW Interpolation in QGIS gives weird values

I'm trying to do an IDW interpolation with QGIS tool. But i'm really surprised by results. Interpolation values aren't similar as shape values. I used a power of 0.2 to get a smooth raster. Somebody ...