Questions tagged [interpolation]

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

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2answers
22 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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11 views

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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25 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
44 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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15 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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30 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
42 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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21 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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80 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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30 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
60 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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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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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
22 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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28 views

Points interpolation on a polygon geometry

I would like to know how to interpolate point data on a polygon geometry. I have two PostGIS tables: the first one contains hourly rain values evaluated in the nodes of a regular grid (specified in a ...
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1answer
95 views

Creating ids of middle point of line

I have line layer as shown in image 1. I created middle point of line by using the below query in virtual layer. SELECT ST_StartPoint(ST_Line_Substring(geometry,0.5,1)) FROM "TR_ROAD copy" ...
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1answer
56 views

QGIS: Spatial extrapolation

I have few sample points with values on (agricultural) field and I want to interpolate and extrapolate values inside the field boundary. Ideally I would like to use Kriging (as it smooths local extrem ...
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29 views

Upper and lower bounds from gstat::krige() and gstat::idw()

Is it possible to obtain lower and upper bound values from a kriging estimation using gstat::krige() in the same way it can be obtained from a simple lm() model? The following lm() example comes from ...
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1answer
26 views

GRASS GIS v.surf.idw not working correctly

I have recently been struggling with an issue in GRASS. I am a new GRASS user and recently downloaded version 7.8.5 for my MacBook (macOS Catalina). I converted this sample dataset to a shapefile. I ...
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3answers
270 views

PostGIS: Interpolate/Cluster geographic points to average points

Setup: PostGIS 3.1, QGIS 3.16 I have a bunch of geographical data (geometries). They show more or less the same route, just measured several times. Due to the many measurements and the GPS precision, ...
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2answers
54 views

Finding regularly intervalled GPS positions between two known GPS points

I have been trawling for a solution for a while now, and either I cant find the correct solution or I'm not quite getting my search right. I have some GPS points from a ship track that are collected ...
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19 views

Interpolation of CSV Data [duplicate]

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 ...
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39 views

Error when executing TIN Interpolation with two sets in QGIS

I am trying to TIN two datasets using TIN Interpolation with XYZ points in QGIS. I keep getting this error: Traceback (most recent call last): File "/usr/share/qgis/python/plugins/processing/algs/...
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1answer
61 views

Interpolating LineString by adding new Point in middle between each two points [closed]

I want to add interpolated points in a LineString using shapely. The interpolated points should be in the middle of every two Points present in the LineString. The shapely interpolate function adds ...
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14 views

Convert Areal Interpolation raster into polygons weighted by population (ArcGIS Pro)

Using the Areal Interpolation function in ArcGIS Pro, I have an interpolated raster layer of disease counts. This was derived from a district-level dataset. I am now wanting to portion this raster ...
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1answer
60 views

How to create a grid to do kriging interpolation that correspond to areas in a map having actual observations?

I need to do kriging interpolation but wanted to have the interpolation in areas where I have actual data; not across the whole map. This is my example. Here is the base map (shp file in a .zip file): ...
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124 views

Doing TIN Interpolation in QGIS

I want to do TIN Interpolation on a layer but when I fill all the fields with the right data (vector layer, interpolation attribute, extent etc) the algorithm does not run and shows me this message: ...
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49 views

Calculating GPS coordinates given distance between points

I have 2 points where I know the GPS coordinates of one of the points. Additionally, I know their coordinates in some reference frame where I can calculate the distance between them in real world ...
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1answer
60 views

Why krige function return all NA's values for the prediction when trying to interpolate a variable?

I am trying to build a map with kriging interpolation for a variable. When running the krige function the return is all NA values and the kriged map plot only one value. I couldn't find out why and I ...
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2answers
115 views

Is Satellite Image Continuous Data?

I have a satellite image of one region. I perform interpolation on this image. However, I am not sure Satellite Image is continuous or discrete data.
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1answer
61 views

Interpolate only no value cells not connected to the egde of the raster

Is it possible to interpolate geotiff raster no value cells that are not connected to the geotiff border by other no value cells with QGIS or other freely available tools? The grey areas are gaps. I ...
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3answers
169 views

Do I necessarily need coordinates for spatial prediction?

Commonly, it is stated that spatial prediction is the same as spatial interpolation, i.e. the estimation of values based on the observations' location: y ~ lon + lat Others state, that spatial ...
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41 views

How would a Kriging model react to different z values at same point

Say I have a very large dataset of values collected at points over many years. For the sake of an example, we'll pretend it's the altitude at certain lat/longs. If some of those points appeared twice ...
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1answer
35 views

IDW interpolation in ModelBuilder by column in ArcMap

I want to interpolate using the IDW method in ArcMap. I have to interpolate the values of several months for several years. I have the data in a shapefile in which each column has the values for each ...
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1answer
42 views

Generating new data in curve (polyline) by interpolation of existing data in this curve

I am trying to add altitude data on the vertex of a polyline in QGIS. I have extracted points from the vector layer of the polyline to update the Z-value. I have altitude for some points, new points ...
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0answers
21 views

How to do a Correlation of various Raster Data and show the result in a Correlation Matrix

I am doing spatial correlation of soil Data sets. I did various Kiriging Interpolations with the krige function. The output was cut to a target raster to have the same raster size for all Kriging ...
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49 views

Interpolating Z at polyline vertices between known Zs

I have polyline strings with vertices of known elevation / z height and intermediate vertices with null/zero height. Known Zs are spread throughout the line. I'd like to be able to populate the z of ...
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0answers
32 views

Forcing boundary conditions in interpolated/kriged data?

I am using pykrige.ok import OrdinaryKriging to generate a spatially continuous field from sparse point data (see image below). The data (glacier ice thickness) are such that there is a hard boundary (...
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1answer
76 views

Seeking open source alternative to Spatial Analyst / 3D Analyst toolbox of ArcGIS Desktop

Is there a decent open source software alternative for the Spatial Analyst / 3D Analyst toolboxes of the ArcGIS environment? The main goal would be to demonstrate DEM interpolation and/or ...
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1answer
81 views

Error in “Extract values to point” in arcpy

I am working on spatial interpolation. To extract values for my required points, I am using "Extract values to points" tool from Spatial interpolation toolbox. The tool is working good in ...
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2answers
58 views

Including elevation information while temperature interpolation

I am working on ArcMap 10.5 for temperature interpolation. I am using IDW for interpolation. I need to compare the results with and without elevation data. However, I am unable to understand how to ...
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0answers
22 views

Kriging (or other interpolation) with integral constraints?

I would like to interpolate a continuous variable (from observed point locations) on a surface (gridded) but using an external constraint that the cumulative distribution function of the interpolated ...
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2answers
98 views

Regridding a rasterbrick in R using bilinear interpolation

I have a rasterbrick (of monthly precipitation data from 1901 to 2018) and it is currently in a at a resolution of 0.5, 0.5 x,y. here are the details of the data: class : RasterBrick dimensions :...
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2answers
84 views

Interpolating values in UTM grid [closed]

I've got a 10x10 km UTM grid (vector file), which I want to use for showing the distribution and abundance of a bird species. For each cell, I've got a value for the survey effort (number of days, ...
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0answers
34 views

Interpolating climate data over DEM in ArcMap

I tried to interpolate climate data using IDW by inserting DEM raster as a mask, but I got the Map of precipitation levels without taking into account elevation data. How can I get map of ...
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0answers
110 views

Having trouble with the Heatmap's (Kernel Density Estimation-KDE) interpretation in QGIS 3.10

i wanted to generate a density/concentration map of a parameter, in this case Carbon percentage in a water sample. The dataset in csv file looks like these : So, I imported the csv file then plotted ...
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1answer
149 views

QGIS: Interpolate height value on polyline from point-values for use as breakline in TIN-creation

We use point heights from a survey to generate a TIN. In order to improve the quality of the TIN, additional break lines should be defined. These break lines shall receive the height information from ...
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2answers
279 views

Spatial interpolation in PostGIS without outputting Raster

I have some data that is similar to rainfall, ie. a latitude, longitude, and a Z number. It is in a point layer that is a nice clean point grid. Many Z numbers are missing in this grid. I want to ...
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0answers
30 views

QGIS Linear Z interpolation on snapping

The interpolation of the Z value when snapping in the creation of a new feature is done well in QGIS 3.14, but when editing elements this does not happen. Is there any way to do it?
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1answer
39 views

How to interpolate sf LINESTRING to another pre-defined grid?

I have a set of sf lines, which on an irregular grid, in other words, they have random coordinates. Is there any way to interpolate LINESTRING coordinates to a regualr grid for example as defined ...

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