Questions tagged [interpolation]

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

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1answer
68 views

TIN Output empty raster and corrupted Triangulation network

In Qgis: I've got a point shape (EPSG:3398) with some height info and want to create a TIN interpolated raster with the Qgis TIN-Interpolation tool. But after running there was a raster created, which ...
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30 views

QGIS Kriging is taking forever

We run electrical conductivity surveys which generate a high volume of data. For this project we have 250,000 data points. I'm coming from Geosoft's Oasis Montaj where we can create large maps in ~...
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13 views

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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8 views

Zones are not made for every color variation

I have some ndvi values by which I have made interpolation (used IDW) map. When I use contour tool from Spatial Analyst tool it only outlines(blue lines) some data. I have tried different contour ...
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16 views

Reclassify a raster to floating point values range

I have an interpolation map for my NDVI data values ranging from 0.16 to 0.83. Example 4 classes, (0.16-0.28,0.29-0.36,0.37-0.53,0.54-0.83). But when I do spline interpolation classification goes from ...
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34 views

Interpolate nodata in rasters using Python

I have a raster of the shape (1000,1000) and some areas having no data values. I would like to fill the data gaps by interpolating or tinning (does not matter) over the surrounding areas, however I ...
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27 views

QGIS TIN Interpolation won't run (reports “Wrong or missing parameter value: Input layer(s)”

I'm trying to run the QGIS Tin Interpolation command, but get the following error message when I try to run the command: "Wrong or missing parameter value: Input layer(s)." The vector input to the ...
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1answer
39 views

How to set the layer attribute for IDW interpolation tool within a QGIS Python script

I have a custom Python script in QGIS 3.10 that integrates some QGIS tools. One of them is the IDW interpolation tool. My issue is I don't know how to properly set the layer attribute to be used for ...
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1answer
53 views

Interpolating DEM using Kriging in R

I have several DEMs as geotiff files which I load into R using raster::raster. Now some of these DEMs contain patches of missing values, represented by NA. I would like to interpolate these missing ...
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22 views

Spatio-temporal kriging

I have a geospatial dataset of air quality and I want to interpolate the air quality value across time and space for unmeasured location and time instace. I found gstat package in R could do the ...
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1answer
36 views

Flattening lakes for hydro-flattened DEM using polygon vertices in QGIS

I have the vertices around lake polygons that I want to flatten for a hydro-flattened DEM. I know that ArcGIS has a trend tool that will create a sloped 'plane of best fit' for a series of points, ...
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1answer
27 views

Add symbology to raster - color ramp with manual breaks - in ArcGIS Pro

I would like to add symbology to my raster. It is a single band raster. I have a color scheme already imported in my ArcGIS Pro Project. I would like to have a color ramp but with breaks manually ...
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1answer
48 views

How to estimate time spent within a location using GPS/timestamp data in PostGIS?

I am new to PostGIS, and I am trying to estimate time spent in a location based off of interpolating time between GPS points (I am using PostgreSQL 12.2 and PostGIS 3.0). I have GPS points stored ...
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20 views

ArcGIS Pro - Interpolating causes longitudinal extent to increase (i.e. range(-180,180) instead of range(165,178))

I tried both IDW and (Ordinary)Kriging interpolations, setting both processing extent and mask (in the environment pane) for the study area, which works initially, as can be seen with the Raster layer ...
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15 views

Interpolation Failing with “triangle collapsed” When using the Interp Library from R

I am using R to try and extract the bathymetry profile along a line of bearing. The function that I have up till now was using the akima::interpp function. This was working swimmingly. I decided to ...
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25 views

QGIS KDE (Heatmap) TIF file --> Open in ArcGIS in order to use Kernel Interpolation With Barriers

So I've created KDE .tif files in QGIS, but there are currently no plugins available in QGIS, which takes into account barriers when creating KDE density rasters for species. I can bring the .tif ...
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37 views

Interpolation with barriers in Google Earth Engine [closed]

Does anyone have a code example or helpful information to conduct Empirical Bayesian kriging on Google Earth Engine or of an interpolation with barriers technique in Google Earth Engine?
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29 views

Create grid by interpolating two data sets?

I have two data sets A and B. Each data set have lat, lon and temperature but different lengths A=[200,3] B=[250,3]. I would like perform interpolate A and B and display the temperature(average ...
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1answer
50 views

How do I get accurate DTM from DSM to get tree height?

I have drone imagery which was generated in Agisoft. From the imagery a DEM was generated and exported. I would like to know how do I get the Digital Terrain Model from this DEM? as I currently have ...
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23 views

How to calculate interpolated timestamps of linearly referenced points in ArcGIS?

I have a point feature class with timestamp attribute belongs to bus-gps smartcard data-set. I've used linear referencing tool to snap these points to a bus-route. So there are milepoints in the ...
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23 views

How to smooth discrete raster data with GDAL in C++?

I am using GDAL in C++ for upsampling land-cover raster data. When upsampling, I would like to smooth out the edges, so that I do not get aliased stairs but nice diagonal lines. Essentially, the "...
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21 views

Why is my interpolated map seemingly in the wrong position relative to the points?

I am trying to interpolate a surface based on these points but the output map looks like it's offset. I can't figure out why. They both have the same CRS WGS84 4326.
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21 views

Non-square raster pixels created during TIN Interpolation?

I am trying to create a raster by using the TIN Interpolation tool in QGIS. I'm using a 3D polygon shapefile as input. I'm looking to create a raster of square pixels, although despite specifying a ...
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0answers
21 views

QGIS Grid rasters have no resolution setting

In earlier versions of QGIS you could create rasters like heat map and interpolation, and define the resolution of the raster. In 3.10 I see these dialogs are new, and raster size fields disappeared. ...
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27 views

QGIS TIN interpolation - error in pixel size of output

When using the "TIN Interpolation" tool in QGIS 3.10, the output raster file doesn't keep the pixel size I specify. For example if I specify a pixel size of 1.0m, the output file actually has a pixel ...
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1answer
42 views

interpolate raster into a continuous surface image--QGIS

I have a raster of non-continuous surface with valid values and nodata values, and I'm trying to interpolate it into a continuous surface image without nodata values using QGIS. Anyone could help? ...
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1answer
65 views

DEM interpolation, QGIS 3.10

A friend of mine gave me DEM resolutions of cells 5x5m, but there is something wrong with interpolation. When I try to make a cross-section of the terrain I get a pretty inaccurate cross-section, with ...
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1answer
27 views

Kriging for Soil Nutrient Analysis

I have collected soil analysis results on a gridded basis within fields. These grids were generated on a 35m based upon digitised polygons of the field extents. I have imported my soil analysis ...
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1answer
121 views

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 ...
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2answers
95 views

Visualizing signal strength by location

I have a dataset which contains location and signal strength data from a field survey for a radio project I'm working on. An example: lat, lon, signal 34.123, -89.123, 55 34.124, -89.124,...
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86 views

Interpolating xyz-points to raster in QGIS

I want to interpolate xyz-point data to a raster. x,y,z 3435339.20,5412714.28,-0.22 3435340.19,5412714.28,0.06 3435339.20,5412715.28,-0.20 I imported it as csv and saved it as shape. Then I ...
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1answer
102 views

Finding nearest points to an interpolated point along a Shapely linestring

I'm using Shapely to interpolate points every 500m along a linestring. For each interpolated point I'd like to find the nearest original points (immediately before and after) in the linestring. (I'd ...
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1answer
82 views

Seeking open source tool for 3D Interpolation

Empirical Bayesian Kriging 3D (EBK3D) looks to be the tool I need within ArcGIS. It requires a GeoStatistical Analyst license. Is there is a similar tool or library that is free and open source? I'...
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30 views

Interpolation of point data (postgis, geoserver) [duplicate]

I have a table in postgis with point data. A geoserver sql view layer is used to show a subset of these points (according to user selections). What I want is do is to interpolate these points (...
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1answer
59 views

Calculate average of the temperature value from 4 surrounded points in PostGIS [closed]

There are two-point tables. One includes temperature value and the other does not have this information. I would like to calculate the average of the temperature for the 2nd table based on the four ...
4
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1answer
72 views

Postgis/Postgresql - Interpolate equadistant points based on weighted attribution similar to QGIS Interpolation(Heatmap Kernal Density Estimation)

I have equadistant vector points, that are all 400m apart but only cover certain areas of a map that have a value of (1-5). In QGIS I can run the Kernel Density Estimation with my vector points to ...
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0answers
15 views

Rasterize will output 0 as NODATA (QGIS)

I have a data range which includes 0 ex +3 to -4. I would like the rasterize to include my 0 data (create a pixel) and just exclude the NODATA (where there is no points)
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31 views

Rasterize right method for true value of point grid?

Is rasterize an interpolation or does it just burn in the "true" value of the point? I have a grided data that is evenly spaced and dense. I would like to just have a raster with the "real" value of ...
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1answer
61 views

Reduce artifacts/errors in DEM

I have some roads and some points containing elevation data. Obviously the data does not cover the whole area, as it was created by a surveyor. Based on this data, I need to check, whether the ...
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0answers
53 views

Creating smaller sized grid and interpolating data from bigger grid

I am working with a vector grid that looks like this: I am not very experienced with QGIS and have been looking for a way to divide each mesh of the grid a certain amount of time to get a smaller ...
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0answers
37 views

Why is my Nearest neighbour outputting higher value in a equally spaced grid?

So I got a point layer which is equally spaced 0,5x0,5. When I run the nearest neighbour and accounting for the extent so that the raster cells are centered, I get this result. I got maybe five areas ...
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0answers
60 views

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

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
98 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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0answers
43 views

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
10k 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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1answer
58 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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19 views

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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0answers
56 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
53 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 ...
2
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1answer
63 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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