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Questions tagged [inverse-distance-weighted]

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

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Overlapping emmissions with Euclidean decay

I have a number of emission sources (roads) with varying emission values (noise). For the sake of simplicity, let's say the sources were 3 points. The emitting noise decreases by the inverse distance ...
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Join KML with CSV and conduct Interpolation

I have a KML file created in Google Earth that has points where we sampled 11 monitoring wells (my work uses Google Earth Pro and I'm trying to introduce QGIS). I have a CSV that has the contamination ...
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How to show point data as a colored map?

Im doing one, I would say, simple analysis, but Im rookie when it comes to GIS, so I need help. So, I have data of CPT (cone penetration test) which our firm conducted over the years and within that ...
Marko Boričević's user avatar
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How to export an IDW DTM as a GeoTIFF file in R

I have loaded both raster and lidR packages within RStudio and I am trying to export the IDW DTM files but have been receiving errors about 'format'. I have exported a TIN DTM already however with IDW ...
Niall Gavin's user avatar
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IDW processing not running as expected in standalone script

I'm trying to automate idw interpolations from my database using PyQGIS in a standalone script. I copied the python command from the GUI which is how I got the fields I am using for the algorithm. ...
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Run ArcGIS IDW tool in QGIS

I am attempting to duplicate/implement an ArcGIS workflow with QGIS as part of a larger project. I have figured out most of them so far, but what stumps me is the Inverse Distance Weighting. The left ...
Noxy's user avatar
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Point Interpolation in ArcGIS

I have a set of data points in a CSV format. I want to create a contour map using the data points so I used IDW Interpolation in ArcGIS. But, when I checked the maximum value of the output raster, it ...
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Standard deviation of interpolated data

I have a dataset with air-quality measurements in several points across one state, through several months. Thus, for each point I can calculate average, variance and so. My goal is to interpolate data ...
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Alter cell size of gdal_grid command

I'm using the below command in the GDAL commandline to grid a shapefile using IDW interpolation gdal_grid -a invdist:power=2.0:smoothing=1.0 -of GTiff C:/users/public/test.shp C:/users/public/test....
Guest_question_1087626532's user avatar
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Calculate distance to target pixels in Google Earth Engine

I am having a water body raster in the form "0" as water pixels values and rest of the area is "masked". I want to have my output in the form of an image such that each point in ...
soumik chakraborty's user avatar
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Automated digitization within a point layer in QField

I am attempting to create elevation contour lines for a piece of property with the help of a GNSS sensor hooked up to a tablet with QField installed. So far, it looks like the screenshot below. I used ...
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Inverse Density Weighting (IDW) not reaching to edge of mask in ArcMap

I am trying to use Inverse Density Weighting to illustrate percent cover of corals on reefs in Hawaii. There is a particular reef (see attached screenshots) where the polygon used for the mask is not ...
Trevor Johannsen's user avatar
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IDW interpolation with noise values in ModelBuilder in ArcMap [closed]

I'm using ModelBuilder to create a noise map using IDW. But in the attribute table I have two columns with different values: Lden is the average of the values ​​throughout the day and Ln is the night ...
Laura Ferreira Barbosa's user avatar
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How to aggregate total amount of precipitation from all cells within three seperate catchments?

Using ArcGIS Pro, I ran 4 different IDW interpolations (rasters) of rainfall measurements across 26 measurement stations (point features). I'm trying to now aggregate the total amount of precipitation ...
saltytooth's user avatar
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Calculating volume of IDW raster below Height of Plane, but it is failing

I am using ArcMap. I am trying to calculate the volume of water using IDW Tool. When I reach a point to calculate, the statistics below height of plane cannot run, giving me 0.00, What could be the ...
Manoah Muchanga's user avatar
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Using Raster Clip

I’m not super experienced in ArcMap, but I’m trying to clip an IDW to the outline of a grid of my study area in Mobile Bay (and the Mississippi Sound). Problem is that when I clip it, it looks weird. ...
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ArcGIS Error 000861: Input feature is not valid

I am trying to execute IDW of dataset (.csv format) in ArcGIS 10.8. But it is showing following error How do I solve this problem?
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IDW plot miscalculation

I want to perform IDW in R and plot it with ggplot. Here is my code so far: library(tidyverse) kerpensample_df <- read.csv("C:\\Users\\49151\\Desktop\\kerpentest0909x.csv", ...
simonericmoon's user avatar
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IDW error in ggplot in R

I want to perform IDW interpolation and plot it with help of ggplot. library(tidyverse) kerpensample_df <- read.csv("C:\\Users\\49151\\Desktop\\kerpentest0909x.csv", ...
simonericmoon's user avatar
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Difference between interpolated map using IDW in ArcGIS and turfjs

I did the interpolation from the same map using arcgis and the turf.js library, using the same parameters and points. Could anyone say why the difference? ArcGIS params ArcGIS Map Turf.js params ...
Felipe Fontes's user avatar
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2 answers
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Resolution Setup for Precipitation Interpolation in QGIS

I am trying to interpolate rainfall data using the GDAL's Grid (Inverse Distance to a power) in QGIS 3.16. Is there a way to specify the resolution of the result/change the size of pixel? The ...
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How to create Inverse Distance Weight of points and sum the result (not interpolate)?

I have a list of point locations and I would like to create an IDW result that does not interpolate, but sums instead. So, each point would have a bullseye pattern around it, but there would be ...
f.thorpe's user avatar
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Change symbology of interpolation layer using ArcPy

The code below creates many IDW rasters: for date in all_dates: # Create a feature layer of each unique date where = "{0}=date '{1}'".format(arcpy.AddFieldDelimiters(datasource=fc, ...
user181566's user avatar
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Using geopandas GeoDataFrame in gdal.Grid for spatial interpolation viz IDW, nearest neighbour etc

I want to interpolate the point data using IDW with GDAL osgeo.gdal.Grid. IDW_gdal = gdal.Grid(Output, input, zfield="rs", algorithm = "invdist", ...
Abhilash Singh Chauhan's user avatar
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1 answer
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Interpolation layer not moving by time slider using ArcMap

I have temporal point data and time slider works well for points , but while I use IDW interpolation the interpolation raster is fixed and does not change by time slider. Is there any way to move ...
user181566's user avatar
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Most appropriate weights for interpolating temperature for a point from raster data

I have raster data for minimum and maximum temperature from NOAA's CPC Global Daily Temperature data set found here https://psl.noaa.gov/data/gridded/data.cpc.globaltemp.html I also have survey data, ...
Cannon's user avatar
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Points interpolation on a polygon geometry

I would like to know how to interpolate point data on a polygon geometry. I have two PostGIS tables: the first one contains hourly rain values evaluated in the nodes of a regular grid (specified in a ...
Sara's user avatar
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Upper and lower bounds from gstat::krige() and gstat::idw()

Is it possible to obtain lower and upper bound values from a kriging estimation using gstat::krige() in the same way it can be obtained from a simple lm() model? The following lm() example comes from ...
hiperhiper's user avatar
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Proper way to deal with repeated observations in IDW interpolation

I am trying to apply IDW interpolation in a situation where I have multiple clusters of points, and all points in each cluster have identical coordinates. My understanding is that different IDW ...
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Weighted Distance with Focal Statistics / Raster Calculator

I have a raster image of a road network with pixel values corresponding to vehicule frequency. What I would like is to calculate a weighted distance raster with the frequency as weight within a ...
bountan's user avatar
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IDW interpolation in ModelBuilder by column in ArcMap

I want to interpolate using the IDW method in ArcMap. I have to interpolate the values of several months for several years. I have the data in a shapefile in which each column has the values for each ...
Sss's user avatar
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2 answers
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Including elevation information while temperature interpolation

I am working on ArcMap 10.5 for temperature interpolation. I am using IDW for interpolation. I need to compare the results with and without elevation data. However, I am unable to understand how to ...
Maria Sheikh's user avatar
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1 answer
174 views

Using gdal_grid tool - set a defined extent

I want to use the gdal_grid interpolation tool. Is it possible to set a defined extent?
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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 ...
FRITTENPIET's user avatar
2 votes
1 answer
556 views

Create an 'heatmap' based off of a numeric attribute in a point feature class [closed]

I have a shapefile with several points, each of which has a numeric attribute 'price'. I am trying to find areas that have the most potential revenue concentrated based off of the price in the feature ...
Matthew Fogarty's user avatar
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205 views

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 ...
Mateus Amorim's user avatar
3 votes
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478 views

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?
Vee1's user avatar
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IDW Interpolation in QGIS 3.10 - Power Coefficient not working

Trying to set the power coefficient for the IDW interpolation in QGIS 3.10 in pyqgis. Whatever number I set it has no effect on the interpolation output - always the same output. The default is 2 ...
GIS_py's user avatar
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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 ...
user159027's user avatar
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1 answer
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Interpolation for unevenly spaced data points

I am currently having some trouble finding a good interpolation technique for unevenly distributed spatial data points. Let's give a quick example : I have a 1000 points dataset. As several surveys ...
stilgars's user avatar
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198 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 ...
Babak H. S. Asadollah's user avatar
1 vote
0 answers
558 views

Geochemical maps with QGIS: Case of multiple analyses in a point [closed]

I am a newbie, using QGIS 3.4. My goal is to create geochemical maps of species distribution in water samples. I mine data from a database, regarding specific points, which are boreholes or springs. ...
kuroashi's user avatar
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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 ...
Pvt Kane's user avatar
1 vote
1 answer
330 views

Using IDW tool in ArcGIS Desktop

In ArcGIS Desktop 10.7 we have IDW tool, but when you want to work with it you should need two layers such as : Some points and a closed polyline (Boundary) as following: then using IDW: but I have ...
ali's user avatar
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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 ...
Alex's user avatar
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1 answer
448 views

Add legend with ArcPy over my interpolated map

I have created an interpolated map with arcpy.IDW_ga and I am exporting it to PDF with arcpy.mapping.ExportToPDF. How can I add a legend to the map with ArcPy? In the end, I want to apply the code to ...
IceBelt's user avatar
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3 votes
1 answer
331 views

Evaluating elevation change between multiple LiDAR datasets

I am hoping to get some insight from others who are familiar with comparing multiple LiDAR surveys to one another. I have two LiDAR surveys with similar extents that I would like compare for elevation ...
JamesS's user avatar
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1 vote
1 answer
408 views

Performing IDW for multiple Z field from attribute using ArcPy?

I have data with multiple columns as 1996_1, 1997_1, etc. I need to perform IDW for each column values and save it. I am a beginner with arcpy. Please help! The code is as follows: import arcpy, os ...
Parimita Saikia's user avatar
1 vote
1 answer
121 views

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 (...
MAD's user avatar
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2 votes
1 answer
893 views

Interpolating in QGIS 3.8.1

I have a problem with getting an Interpolation with the Interpolation Tool on QGIS 3.8.1-Zanzibar. I just performed an IDW interpolation via the QGIS toolbox, with values from a layer that are 18 ...
Jan's user avatar
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