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Questions tagged [interpolation]

The estimation of values at unsampled points based on known values of surrounding points.

http://support.esri.com/en/knowledgebase/GISDictionary/term/interpolation

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What is the best technique for interpolating soil depth from sample points

This is my first post here. I have some points from a soil depth survey and I need to interpolate the depth for a whole area. What is the most appropriate technique for this and is there anything I need to take into account when using the…
jpugh
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Are there any spatial interpolation methods that take into account inequality constraints?

For example if I'm interpolating a water table map from groundwater levels measured in wells and I have a location where a well has gone dry, I don't have a measurement of the depth to water, but I do know that the depth to water is greater than the…
bklag
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Difference spatial interpolation and trend surface analysis

What is the difference between spatial interpolation and trend surface analysis? For example, I read a scientific study that applied a neural network to estimate a surface solely based on the x and y coordinates, claiming that they do spatial…
Funkwecker
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How to calculate the grid point precipitation from the station data?

I have a problem to convert my hourly station precipitation data to the surrounding grid points. I need to convert 4 station hourly rainfall data to 18, 60, and 240 grid points for 0.0625,0.03125, and 0.015625 respectively. I know how to do it in…
Abraham
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Appropriate Interpolation accuracy and method for a particular project

I'm trying to find the best interpolation method for a project I'm working on. I've tried the basic settings with spline, IDW & kriging and they all appear ok at first glance, but when I look more closely they don't follow the points exactly like…
Mike
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Getting Python error for raster analysis interpolation using nearest neighbor in QGIS

I am trying to interpolate temperature values into a raster using QGIS 2.18.15 in Windows. I need the output file as a GeoTIFF (.tif) file. I have my input for temperature already in a shapefile, but whenever I try to execute the command, it shows a…
tonaminato
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Convert a pixel-aligned grid to node-aligned

Given a regular grid of squares with sample points at their centres (a pixel-aligned grid), what would be the best way to interpolate to the corners of the squares (a node-aligned grid). I'm aware of all of the generic convolution-kernel methods…
J.J. Green
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Elevation point raster interpolation

I have a series of elevation points from transect surveys completed on a river. I would like to interpolate this data to reveal the bathymetry of the river. The survey points are shown below: I have tried the default options on topo to raster…
PollyGone
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Creating elevation grid point from DEM

I have photogrammetry DEM with 3 meter resolution. I need grid point with 30 meter resolution with the 3 meter accuracy. Case-1, I created the the 30x30 meter grid points and extract the elevation from DEM. Case-2, I interpolate the 3x3 meter DEM…
Shahid
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Standard for determining accuracy of polygon interpolation technique?

I'm looking into polygon interpolation, and was curious if there are any standards for determining the accuracy of polygon interpolation techniques. I've been looking through papers and lecturers slides and have found a reference (page 6) to…
thad
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Interpolation of CSV Data

I have been doing an interpolation of rainfall data using QGIS and the interpolated data has a line which make the data uneven and the isohyets are being cut at the boundary line of 180 Degrees. I know that this is due to the dateline passing…
shawn
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Interpolation of data

I'm new with the program and I want to know if I can use it for my master thesis so I was trying it out and have the following question: Is it possible to interpolate data out of 5 weather stations (the data is handed in an excel spreadsheet…
user20159
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