Questions tagged [interpolation]

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

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46 views

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", ...
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1answer
20 views

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", ...
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1answer
56 views

Plotting a heatmap of Kriging with coordinate in R

I performed Kriging in R. But I have trouble getting a plot of a colored heatmap showing the resulted interpolated area along with a lon/lat values at the side and on the button. Here is an example, ...
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1answer
36 views

How to set up a target grid for kriging in R?

I've read the exellent tutorial-blog post on Kriging in R by Dr. Wilke - found here:https://swilke-geoscience.net/post/2020-09-10-kriging_with_r/kriging/ Applying this step by step on my data csv-file,...
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27 views

Fast retreival of single-point bicubic interpolation from a raster? [closed]

I have a raster data set with a grid size of 100m. I want to get information from it for a single point within the grid, using bicubic interpolation to use a bit more of the information from the data ...
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1answer
35 views

Multilevel B-spline not working SAGA QGIS

I try performing a multilevel spline interpolation from the SAGA tool but I get an error message. I have loaded a CSV consisting of 1500 points with latitude and longitude and elevation values. I'd ...
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1answer
36 views

Producing raster that shows decay of weighted points

I have a points layer representing the locations of urban green spaces, each containing an associated cooling intensity value and decay coefficient in the attribute table. I want to show the decay of ...
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1answer
24 views

Wrong transform after interpolating points

Following this post, I'ms trugglig wwith interpolation and projection of set of points. I have used griddata in order to interpolate, and seems like interpolation hapenns, however, the results look ...
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1answer
60 views

Interpolating point attributes

I'm trying to fix broken sections in navigation data in QGIS. I have a model that cuts out broken sections of a point layer and inserts new points according to a line layer that I added earlier. The ...
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3answers
200 views

Using Python for interpolate data points with Scipy (open for other solutions as well)

I have dataframe which contains coordinates and measurements, something similar to this (this is fake): id lat long mes 0 -14.1309 -52.4561 0.1 1 -14.1312 -52.5327 ...
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1answer
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Unable to intersect polygons in R even though CRS matches?

I am trying to use areal interpolation to distribute the values from a source polygons layer into smaller, differently-shaped polygons from a target layer, and have been unable to do so. I have been ...
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1answer
30 views

Interpreting semivariogram from ArcGIS Pro

Am having an output for semivariogram from ArcGIS Pro as per below. However, the distance looks small. Is there a way to adjust the distance? Not only that, how best can I interpret the x and y values ...
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44 views

Simple kriging in raster

I want to use a Python script for interpolation in 1st image to have the result of 2nd one, this result is from simple kriging saga. I tried the code below but I have two main problems. Need a lot of ...
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1answer
40 views

Merging GPS data with data that does not have lat long information based on 'time' in spreadsheet before creating map

I have GPS data that represents the movement of an animal underwater (so it is really the GPS position of a boat that followed the animal). I also have a spreadsheet of recorded behaviors from the ...
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2answers
54 views

Performing area weighted interpolation in QGIS

I have encountered a problem that I thought would be much more simple than I see it actually is, and conventional clipping did not work. I have the following grid layer with different values of a ...
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19 views

Cannot increase interpolated raster extents for QGIS map

I have created a map of a lake, and I am interpolating some water quality values over the top by raster grid (inverse distance to nearest neighbour). I have successfully created the three water ...
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55 views

Interpolating 0-1 (presence / absence) point data in a vector using QGIS "3.20"

I would like to make a heatmap using presence absence data (imported as a CSV file) for koalas but I can't work out how to do it. Here is the raw data (presence ) map This is the kind of map I ...
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1answer
68 views

Interpolating weather data in QGIS

I am trying to find a proper way to interpolate weather data and use it for regions without the data. The black points are the weather stations that give me the weather data, the red points are the ...
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27 views

Interpolation QGIS produces a black box

I have a number of points on a map, each with a numeric attribute taking values from 1-9. The points with attribute equal 1 should have the highest density representation, and the points with ...
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27 views

Bilinearly interpolate WMS using leaflet

I have a raster hosted on GeoServer as a WMS that has 10 km resolution and is bilinearly interpolated to look smooth around the edges as such: I am using Leaflet to make a js map with this raster ...
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1answer
30 views

How to change "No data - -3.40282e+38" in a raster through interpolation using QGIS?

I'm working with QGIS 3.16.4-Hannover, elaborating a DEM 2x2m to produce a soil thickness map of an area of 50km2. After some elaboration (curvature, hydrology analysis, ...) now I have a raster with ...
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1answer
23 views

Why does no interpolated line appear when I use the 3D Analyst to generate a elevation profile in ArcMap?

I want to generate an elevation profile based on a DTM with ArcMap 3D Analyst but the program does not show the the interpolated line. I did the following steps: Opening 3D Analyst, adding a Digital ...
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63 views

Co-kriging in R

I am trying to do co-kriging for my rainfall with arsenic data. Arsenic is a target variable. I have used the code below to generate an interpolation grid, but I was not able to generate the co-kriged ...
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1answer
23 views

Making grid from a CSV file in R

I am trying to make a grid file in R for the sake of krigging but when I try to use the code below an error shown below occurs. My xy location data is in metric (UTM) and has 407x475 dimension with ...
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58 views

How to use a temperature raster (e.g., PRISM) to constrain temperature values in a thin plate spline regression and interpolation

I have point data with temperature, latitude, longitude, and elevation. I am interpolating across space to the extent of those points, and have been using elevation as a covariate in the fields::Tps. ...
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33 views

What is the difference between using interpolate() and predictSurface() on a thin plate spline regression?

I have a set of points (not evenly distributed across space), which have location (lat and long), temperature, and elevation. I want to interpolate/create a raster from those points that have ...
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28 views

QGIS, zonal statistics value is missing for a polygons

I am using India district shapefile 2011 to extract rain data. The rain data comes in point layer which I have converted to raster using "IDW interpolation" to get continuous rain data. To ...
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0answers
15 views

Are there any mass-preserving raster projection algorithms?

Raster maps (e.g. as a GeoTIFF) can be reprojected using tools like gdalwarp. While these tools do a decent job to project images, they are not truly mass-preserving, i.e. the total sum of the values (...
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2answers
46 views

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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2answers
67 views

Performing interpolation using QGIS

I measured chemical concentration for different types of soil, and I have a picture or map of the distribution of different soils for my studied area. I assume that the concentration will be similar ...
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13 views

QGIS interpolation map has small graphical glitch

I've made am interpolation map based on depth of a pound. I have 40 depth measurements + an additional 40 measurements around the pounds (0m) Below is the best image I can get while trying different ...
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36 views

IDW interpolation using python GDAL

I have created a raster image of IDW interpolation using python gdal.grid(). When I added the raster layer in openlayer a black and white shade is showing. How can I make it color based on the value ...
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35 views

Depth map interpolation using QGIS

I've produced an interpolation map using QGIS (a pond) I have 40 points with a vdepthalue, and an additional 33 that represent the edge of the pound (depth 0). My map is as follow: and my TIN ...
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1answer
40 views

Interpolating for regular timed data using ArcPy [closed]

I have 20 stations, in the table of which I have the coordinates and the value of the other 3 factors for 2020 with regular intervals of one day. Now I want to create a raster for each of these 3 ...
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1answer
122 views

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", ...
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1answer
61 views

TIN Interpolation Error in QGIS

I am having a problem with a contour file I got from a municipality. Two, actually. I was using 3.16 and it would just hang up at 99% and then fail. This happened with both files. I tried it again ...
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2answers
27 views

Trying to apply inlabru:::bru_fill_missing to a SpatialPointsDataFrame to fill in NAs

I'm struggling with a function from the inlabru R package, which could help me fill in the NAs in my data. According to the helpfile, I need: bru_fill_missing( data, where, values) data is a ...
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0answers
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r.reclass slope interpolation error on mac

Using this video to create a slope analysis for a land I am designing the following error message occurred after I tried to run the r.reclass add-on on a before interpolated file. These are the ...
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30 views

Labelling the GeoTIFF canvas symbology in QGIS3

I used the Interpolation (Nearest neighbor) feature. After watching this tutorial: https://www.youtube.com/watch?v=By-K5C7jDQc&ab_channel=HansvanderKwast I could set the color rendering for my ...
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1answer
49 views

Making polygons from interpolated points in QGIS

I need to know the extension of the area of a lagoon according to depth classes. I started from a point shapefile containing depth values and used the interpolation plugin and I obtained a raster file....
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0answers
29 views

Areal interpolation with mostly missing data in R

I am attempting to preform an areal interpolation using R with the sf package's st_interpolate_aw. Of note, my sampling scheme for my areal units is such that I have many missing values. When using ...
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0answers
37 views

How to choose pixel size while doing interpolation in QGIS?

How do you choose pixel size X and Y while doing TIN interpolation? What determines the size?
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2answers
56 views

Interpolate a new 3D surface between two other 3D surfaces

I have two 3D Raster surfaces which are flood height surfaces for two different flood heights. They each have XYZ coordinates. I now wish to generate a third surface BETWEEN these two surfaces at ...
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25 views

Creation of a polynomial function from old and new coordinate system pairs

I have data points in the old Roussilhe Stereographic coordinate system of Suriname (u,v), I have the same data points also in WGS84 UTM21N coordinates (x,y). I want to create a polynomial ...
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84 views

Interpolation of point data in R

I want to interpolate some daily point data. The ultimate goal is to receive something like a heat map/IDW map with some interpolation statistics like kriging/IDW. My data: Nr. : coordinates : ...
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0answers
44 views

Spatial interpolation of hourly temporal resolution temperature data using QGIS [closed]

I would like to spatially interpolate gridded (10X10km) hourly temperature data to a finer spatial grid (e.g. 5X5km). I am talking about 1 year of data (thus 8760 hourly temperatures) for each point ...
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1answer
90 views

Regression in QGIS

I have point rainfall and temperature values for a district and a few sample yield points for the same. How do I interpolate the yield points for the whole district wrt the rainfall and temperature? ...
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0answers
17 views

Interpolate line not working [duplicate]

I'm just doing a basic topograph and the interpolate line tool does not work. The DEM is selected and I even made a hillshade to see if that would solve the problem. After I finish the line and double ...
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0answers
26 views

ArcGIS Pro interpolation point data along a line (river depth)

I'm analyzing habitat suitability using river depth data. However, my data are pretty basic: point data of the water levels at measuring stations (so literally points, not cross sections). First, I'm ...
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1answer
27 views

Making "heatmap" based on point value not point density using ArcGIS Pro

I have a CSV file containing readings of dissolved oxygen at various points along an estuary. I would like to make a layer displaying these results, where the colour (e.g., dark blue for high O2 light ...

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