Questions tagged [interpolation]

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

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Which resolution is appropriate for resampling a raster in a specific CRS in QGIS 3.6?

I'm trying to resample a raster file to obtain smooth interpolated levels in EPSG:3120 - Pulkovo 1942(58) / Poland zone I projection. (following the steps in this answer) 1. Using the raster ...
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1answer
85 views

QGIS Mask - Error Code

I am trying to interpolate points and then clip the interpolation with a Raster> Extraction> Clipper. I receive an error code after trying to mask over the region I am interested in. Would you ...
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1answer
43 views

Interpolation (TIN) from Python Console in QGIS

I am referring to the most voted answer by root676 in Calling interpolation plugin from Python console of QGIS. root676 ends his/her answer with: Keep in mind that the QGIS-API is currently ...
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1answer
279 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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BASEmesh plugin error while interpolation between quality and elevation mesh

I am creating a 2D hydronumeric model of a watershed. The quality meshing and elevation meshing are fine, but I am getting the following error during interpolation. Does anyone know what should I do? ...
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1answer
44 views

Copying set of points perpendicular along polyline using PyQGIS

I have two layers, 'river (line)' and 'points' for a set of points laying on a line which is perpendicular to the river (for example red points in the first image). Given an interval (5.0 m for ...
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2answers
4k views

Interpolating and infilling raster from 5km pixels to 100m pixels in ArcMap

I am trying to refine a raster dataset of annual rainfall from a 5km grid down to a 100m grid. Before I continue, I am aware that this could result in some uncertainty regarding the data. However, the ...
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1answer
37 views

Adding points every X distance along a LineString [closed]

I have a list of LineString coords: list = [(90, 170), (99.0, 159.0), (321.0, 159.0), (300, 146), (296, 23)] which looks like this. How to interpolate a point at every X distance along the line ...
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2answers
1k views

Setting lower limit to interpolation using ArcGIS Desktop

I have rainfall data that I want to interpolate using spline. I have done Spline Interpolation, only that the values produce negative predicted values which is basically wrong. There should be no ...
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1answer
231 views

Error in gstat.formula.predict(d$formula, newdata, na.action = na.action, : NROW(locs) != NROW(X): this should not occur

I'm trying to perform regression kriging using the code creating variogram m <- vgm(var(soil$Ba), "Sph", sqrt(areaSpatialGrid(slope))/4, nugget=0) v <- fit.variogram(variogram(Ba~RASTERVALU, ...
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Comparing Geostatistical Interpolation Results based on statistical parameters

Using Geostatistical Analyst's cross validation results would it be wise to compare the results I am getting RMSE values for different interpolation techniques (e.g IDW, Radial Basis Function, Kriging ...
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28 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. ...
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3answers
50 views

Rainfall interpolation using ArcMap

I have a layer that describe rainfall for 10 years. Now I want to interpolate the area in ArcGIS Desktop (ArcMap) 10.7. As you know I should define some point on my area to extract the rainfall from ...
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1answer
30 views

lidR - lasnormalize error handling

When normalizing a lasCatalog, the processing stops early with the following error: An error occurred when processing the chunk 22. Try to load this chunk with: chunk <- readRDS("/tmp/RtmpdcuTUO/...
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Interpolating surface as though bare earth DEM after using Extract by Mask in ArcMap

I have some stone wall features that I need to determine the height of in ArcGIS Desktop. I have extracted the features out of the DEM by using the extract by mask tool. Now I need a method for ...
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1answer
48 views

Adding elevation to shapefile in ArcGIS Desktop

I have a shapefile that's actually a polyline (but it's 200 miles!) on the other hand I have a SRTM layer with elevation data. How should I add the elevation data from SRTM layer to the shapefile? ...
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18 views

Elevation point raster interpolation [closed]

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 ...
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22 views

Is latitude valid as covariate for spatial interpolations?

I have information of minimum and maximum mean monthly temperatures Tmin and Tmax, respectively), from more than 300 weather gauges and now I require to create interpolated surfaces of temperatures ...
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27 views

When creating a Nearest Neighbour from xyz, the raster cells are not centered with the original point cloud (QGIS)

I have a gridded point cloud 0,25x025. I ran a Nearest Neighbour with the same resultion (cell 0,25). The points of the cloud and the raster are not centered as seen in the picutre. Am I doing ...
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1answer
43 views

Speed- and COG-aware trajectory interpolation/resampling using Python

I have a set of ship trajectory points that were irregularly sampled and I would like to resample them to a fixed frequency (e.g. every minute). Rather than just linearly interpolating between ...
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172 views

Getting Python error for raster analysis interpolation using nearest neighbor in QGIS [closed]

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 ...
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22 views

Digitized contours on map and interpolate contour line to create surface

I have digitized the contours on a map and I want to recreate the surface by interpolating (using IDW) using these contour line. When I generate contours (extract) to see how well they match with the ...
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1answer
227 views

R kriging raster returns NA for some prediction points?

I am trying to interpolate a raster layer of chlorophyll-a data using kriging (gstat::krige) in R, however the resulting interpolation is showing NA values in a peculiar straight line through the ...
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1answer
45 views

Creating elevation grid point from DEM [closed]

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 ...
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20 views

Creating surface layer from Points in ArcScene

I work in ArcScene where i have some buildings in 3D, on the facades of these buildings in have points of solar intensity. I would like to create a continuous surface of solar intensity for each ...
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2answers
81 views

Attaching point grid data to non-grid points [closed]

I have a dataset with loads of fields of environmental (explanatory) data, as a regular grid of points (black dots in image), and another dataset of sampled (response) values as non-gridded points (...
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1answer
37 views

Kriging error when writing ArcPy script (ERROR 000622 & ERROR 000628)

I am trying to write an ArcPy script that uses Kriging to interpolate various nutrients in the soil (i.e. nitrogen) using ArcGIS Pro 2.4.0. These nutrients were collected by sampling the soil, so it ...
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1answer
538 views

Performing Raster Interpolation using QGIS

I am trying to use the Rasterinterpolation plugin to pick up elevations from a Raster DEM for a series of vector points. Once loaded, the Plugin is accessible through Plugins Menu/ Raster ...
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1answer
32 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 ...
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53 views

Interpolate values in QGIS attribute table

I've got a point shapefile of river sonar data. It got only two fields: id and depth. I want to interpolate depth of selected 40 points (arranged by id) value from 1.49 to 1. Any idea how can I do it ...
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2answers
2k views

Converting / interpolating delimited text csv points grid to surface

I have 12 delimited text csv files with regular pseudo-gridded points for temperature and salinity which look like this when zoomed in (inc distances) and this when zoomed out. I'm trying to convert ...
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0answers
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Appropriate Interpolation accuracy and method for a particular project [closed]

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 ...
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2answers
85 views

Creating a clean TIN interpolation without “Bleeding” in QGIS

If you assume I know little to nothing about QGIS 3.10, but have been attempting with some success to create fictional world maps with it, and that I have very limited (OpenScript and Excel) ...
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1answer
28 views

It is possible to create a raster map using a vector dataset in GeoServer?

I need to create a map of pressure shades using a point data set having each point its value of pressure. So I need to give a color to each point based on its pressure value. But after that I need the ...
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0answers
61 views

Is there a way to create a DEM that follow the point cloud so you don't need to clip the DEM after?

I would like to create a DEM from an XYZ file (gridded 0,25x0,25) with 0,25 cell. I'm wondering if there is a way so that my interpolation follows my point cloud, instead of covering a rectangle like ...
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0answers
33 views

Are interpolation methods the same in all software, produce the same result ( with same settings) or does it differ from software to software? [closed]

I was wondering if interpolation algorithm has been changed? produce the same result in all software so it is not software based. This would be if the settings are exactly the same of course. Let's ...
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0answers
54 views

Error while performing kriging interpolation in QGIS 3.8.3

I am using QGIS 3.8.3 -Zanzibar in order to perform kriging interpolation. I get this error massage: "algorithm 'Ordinary kriging' starting… Input parameters: { 'BLOCK' : True, 'DBLOCK' : 100, 'FIELD'...
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1answer
41 views

Seeking algorithm that can re-locate vertices on linestring so that line does not intersect land polygons

I'm currently working with GPS data gathered from boats. The data has low temporal resolution (every 5 minutes) which causes the linestrings that display the boat's trajectory to be jagged. An example ...
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1answer
40 views

Rasterise 3D polyline using z-values to interpolate cell values

Using ArcMap 10.5.1. I have a ZM polyline composed of 3x vertices, with the vertex z-values representing water level at wells. I am looking for a tool to rasterize this polyline, using the z-values ...
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0answers
53 views

Interpolating Z values from XYZ point dataset to alternative XY coordinates in QGIS

I have a dataset with X1,Y1,Z1 values (x coordinate, y coordinate, elevation -> the red dots in the image below). I also have another dataset with alternative X2,Y2 coordinates (-> the blue dots in ...
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0answers
65 views

Way to speed up TIN interpolation (Delaunay triangulation) QGIS 3

Are there ways to improve processing time for TIN interpolation? I'm using TIN interpolation as a step in a larger process. The interpolation step is taking a very long time (10+ hours to a few ...
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1answer
65 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 (...
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1answer
106 views

Kriging interpolation with blocks as barriers for street level visualization in ArcMap?

I'm trying to do Kriging interpolation with blocks as barriers for street level visualisation, but I can't realise how I can do this. I already have the barriers polygons, data and all. But can I do ...
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0answers
25 views

Clipping interpolated raster with shape of original point data-set

I have a point dataset with XYZ values. I inserted this layer in QGIS 3.6 via layer > add layer > add delimited layer. Then, I interpolated these points to a raster via interpolation > TIN ...
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1answer
1k views

Interpolating contour lines from TIN-model vs Grid in ArcGIS Desktop

I am a complete beginner in GIS and taking a class right now, and we are doing some assignments in ArcGIS Desktop (ArcMap). In one of them we were given a shapefile with heightpoints. These had been ...
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2answers
3k views

Three-dimensional interpolation of temperature profiles using gstat in R?

I'm working on a problem in which I'd like to interpolate a set of oceanographic temperature profiles over a three-dimensional matrix of unsampled x, y, & z locations. The data to interpolate is ...
2
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1answer
912 views

Interpolating every X distance along line in shapely

If I have a shapely multiline object that contains many lines whose total length each is 50km (when traced from the origin), and I want to interpolate along the multiline every X meters (let's say ...
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0answers
76 views

Interpolating VRT to Geotiff using gdal.Grid in Python creates null image

I have a set of points with X, and Y coordinates and associated Z values POINT (-102.9071045 31.43453407 1871.930298) POINT (-102.8339386 31.45111084 1856.14209) POINT (-102.4687424 31.53144836 1869....
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3answers
6k views

TIN Interpolation plugin in QGIS 3.0

I just downloaded QGIS 3.0 on Mac OS X but I could not find TIN interpolation plugin in the Search & manage plugin. Is there something wrong with the Mac version of QGIS 3?
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37 views

Creating interpolation maps in QGIS 3 [duplicate]

I'm trying to create an interpolation map visualizing the global distribution of genetic markers - basically replicating the attached map. Can it be done in QGIS 3.8 (Zanzibar)? I installed QGIS 3 ...