Questions tagged [interpolation]

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

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3 answers
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Replica of point layer data from attribute value in QGIS

I am working in QGIS 3.2 and am wondering how I can create an "exploded" version of a single layer of point data based on numerical attribute values within that layer. As a simple example, ...
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Interpolate on ocean data points without considering land points using Arcmap

I have some ocean data points, and I am trying to interpolate them to create a raster. After interpolating with IDW, the land area is also filled with data. How can I only interpolate the data on the ...
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1 vote
0 answers
56 views

Method of interpolation to create weighted heatmap rasters in R from point data

I want to create a geospatial heatmap that is weighted by a specific variable sourced from georeferenced points. An example dataset is 'us_states' from the 'spData' package. I want to take this data, ...
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2 votes
2 answers
92 views

Missing the raster interpolation plugin in QGIS 3

I can't find the Raster ‣ Interpolation plugin in QGIS 3, I tried to search for it through the plugin's installation applet following this tutorial and searched for 'interpolation', but it doesn't ...
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1 vote
1 answer
29 views

Interpolate XYZ data to give accurate raster output

I have XYZ Bathymetry Data which I would like to turn into a raster using the minimum value or shoal biased in QGIS. I've tried using the rasterize - vector to raster function, but I can't change how ...
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1 vote
0 answers
21 views

Anti-alias raster layer by upscaling/ resampling

Recently, I performed a VGA analysis using Depthmap X. I moved the date over using a Mapinfo file (vector) and rasterised the values to the associated pixelsize. The analysis was conducted at a 2m ...
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Using Point Data to Predict Similar Occurrences in the Future? [closed]

To provide a brief background: I have 5 years of conflict point data which is just a cluster of all years together. Additionally, I have point locations of power plants. The goal is to use the ...
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1 answer
11 views

Interpolated DEM RMSE

I'm trying to figure out the 'true' error associated with interpolated cells in a DEM, which itself is known to have a RMSE of 0.15m. DEM has RMSE of 0.15 Interpolation model shown by cross-...
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1 answer
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How can I use "spline" or Interpolation on a UK Map? [closed]

Basically, I have a number of data across a number of UK cities (London, Aberdeen, Birmingham, etc.). I want to plot them onto a map and then use something like a "contour map" to get ...
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ArcGIS kriging unable to estimate semivariogram when processing extent is set

I'm trying to use ArcGIS kriging tool to interpolate some points to form a raster. The point covers approximately a polygon study are but not exactly the extent of the area. I set the processing ...
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1 vote
0 answers
20 views

Rounding imprecision when performing area-weighted interpolation of population (discrete) data

I guess this is more a conceptual question. I'm performing area-weighted interpolation between two very granular geometries, and I have three variables: population_total, population_men and ...
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16 views

Appropriate kriging variogram model and parameter values in order not to loose information?

I have tried to apply kriging in order to interpolate the measurements to a regular grid. The function that generates the grid is the following: from pykrige.ok import OrdinaryKriging def ...
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0 votes
1 answer
36 views

Taking average of long term daily rainfall values if it contains lots of zero values

I wanted to interpolate my daily rainfall data into ArcGIS for visual representation. I have almost 10 years of daily rainfall data which contains lots of zeros. When I take the average daily for ...
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1 vote
1 answer
128 views

Geographically weighted area-to-area Regression CoKriging for raster downscaling in R?

this will be probable a series of questions, so in this one I will try to set the big picture. I want to perform geographically weighted area-to-area regression Cokriging (GWATARCoK) to downscale 1 ...
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1 vote
1 answer
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TIN-Interpolation doesn't fit coordinates

I am working on a project for the university and have to use TIN-Interpolation to analyse the raster. I have the issue that the raster doesn't fit to the points. I found a post that recommend to ...
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1 answer
39 views

Interpolate temperature values (with associated lat and lon values) at different depth intervals using Krig function in the 'fields' R package

I have temperature data points in different depth intervals with associated lat long values across the study area. I want to make a raster and then interpolate between cells of the raster where there ...
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0 votes
1 answer
34 views

Seeking"Fill nodata" tool in ArcMap

I have some NoData cells in my grid (landuse) which I want to fill depending on the neighbouring cells - more precisely the edges. In QGIS there is a tool from GDAL that does exactly that. Is there an ...
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2 votes
0 answers
68 views

Aggregate interpolated data at county level with R

The raw data is at the state level and I would like to go down to the county level. To do this, I first adjusted the data to county level and then interpolated it. The raw data on state level looks ...
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1 vote
1 answer
94 views

"ValueError: negative dimensions are not allowed" when using raster created from points in CSV

My problem is similar to "ValueError: negative dimensions are not allowed" when using raster created from NetCDF I am working on a raster that I generated from the interpolation of some ...
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0 answers
36 views

SAGA Interpolate (cubic spline) not working

I'm using QGIS ver 3.20.3 and keep getting the following error when using Interpolate (cubic spline) tool from Raster - Spline Interpolation. The following layers were not correctly generated. • C:/...
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0 votes
0 answers
58 views

QGIS Tin interplation not working

I'm brand new to QGIS and I'm trying to interpolate a set of X,Y,Z points but I'm not getting meaningful results. Below are the (Lon, Lat, Elev) points, their triangulation, and interpolation results (...
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-1 votes
2 answers
44 views

Creating polyline that represents Mean shoreline position from set of 4+ polyline positions for that year using ArcMap

I am looking at tracking shoreline positions across a few decades and in order to remove the noise of seasonal change I want to create a mean shoreline position that represents several shorelines ...
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0 answers
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Rasterizing line-data with a gradient from the middlemost point

My aim is too rasterize a line data in a way so the middlemost part data is 1 and the outermost pixels are 0 - everything between should be interpolated. The illustration below should showcase my goal:...
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0 answers
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Projection causes interpolation error?

I'm trying to do an interpolation with matplotlibs tri function, but the results show as empty for some reason. Specifically, I am trying to interpolate rainfall across an island given 41 weather ...
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  • 153
2 votes
0 answers
30 views

Perform zoning on irregular points by value (nutrient distribution)

I would like to perform a zoning (nutrient distribution) of a agricultural land. I got the bounding and inside them irregular probe points with different values (phosphorus content - P). Now I would ...
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1 vote
1 answer
51 views

Increasing resolution of raster, having the coordinates match a reference raster and interpolating missing values in QGIS

I have two rasters of different resolutions of the same country. One raster contains information of Global Horizontal Irradiance (GHI) and has dimensions of 3200 × 2400. The other raster contains ...
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0 answers
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Error and warning when converting SAGA grids to ESRI ASCII/binary grids?

I am converting an interpolated SAGA.sgrd format object to Esri ASCII/binary grids, but I am encountering an error when converting the object, the error is like: Error: input file [INTER_NN.sgrd] ...
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2 votes
0 answers
34 views

Filling missing values of aspect (flat areas without data) using QGIS

I calculated the aspects of point stations from a DEM and the flat areas are left without data (null). As the purpose of preparing aspect values is that I am going to do geostatistical analysis, ...
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3 votes
1 answer
51 views

How can I extract cell numbers/dimensions from cell size and extent?

I need to rasterize a SpatialPolygonsDataFrame object. I have a cell size of 100m for my analysis and the raster extent is extracted from the Polygon. But, the problem is that I cannot set a ncol and ...
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2 votes
2 answers
35 views

Self-intersecting problem in Canadian census tracts shapefile?

I need to pass some data stored at the census tract level in Toronto to dissemination areas. When I run the Areal Weighted Interpolation package (code below), I get an invalid topology error (see ...
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2 votes
1 answer
41 views

Interpolation Error: Saying it is completed but doesn't show up

I am using processing toolbox Saga Interpolate (Cubic Spline) tool. I then enter the details needed interpolating and click Run. I get a task complete sign but don't get the file. In the Interpolate ...
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2 votes
1 answer
180 views

How to create a raster heightmap from contour lines in a vector layer

I'm a beginner with GIS software and I'm trying to get a raster greyscale heightmap from contour lines (read from a GeoPackage) in QGIS. I'm using the Grid interpolation tools (menu Raster>Analysis&...
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0 votes
1 answer
69 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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0 votes
1 answer
27 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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1 vote
1 answer
252 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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0 votes
1 answer
61 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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2 votes
0 answers
53 views

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

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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3 votes
1 answer
152 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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1 vote
1 answer
87 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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2 votes
1 answer
36 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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4 votes
1 answer
69 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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6 votes
3 answers
1k 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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  • 1,797
0 votes
1 answer
85 views

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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0 votes
1 answer
38 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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1 vote
0 answers
238 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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3 votes
1 answer
60 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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3 votes
2 answers
107 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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1 vote
0 answers
31 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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0 answers
106 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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1 vote
1 answer
136 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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