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Questions tagged [interpolation]

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

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Plot vectorised contour maps with Python and bokeh

I have a csv file with point data, i.e. lat/long coordinates and a third column named "size" which represents the average size of crop in a pair of lat/long coordinates. The csv file with ...
André Lourenço's user avatar
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How to make a heatmap to show the distribution of attribute values more accurately?

I want to be able to create a heatmap that shows the distribution of the attributed "carbon" value within a merged layer. I have a merged vector point layer that represents the combination ...
Greeny's user avatar
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Overlapping emmissions with Euclidean decay

I have a number of emission sources (roads) with varying emission values (noise). For the sake of simplicity, let's say the sources were 3 points. The emitting noise decreases by the inverse distance ...
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Setting Interpolation Methods for raster layer to bilinear not taking effect

My GeoServer version is 2.25.0. After publishing a single-band raster as a WMS, I configured the layer with a bilinear resampling method. However, when I view the service in the OpenLayer preview, ...
苏云明's user avatar
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Raster calculator substraction does provides wrong values TIN interpolated raster (QGIS)

new here. The objective is to calculate the volume of contours I made, I've tried with very simple geometries with no luck (half a sphere in this case). I contours I made were TIN interpolated with ...
LauraTechrem's user avatar
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Filling in NULL data in vector grid with values derived from Nearest neighbour cell values

I have created a grid with 5m x 5m cells which contains the summed values from a point file. Within the grid I have NULL values (selected in Yellow) where there was no points within the cell, yet the ...
A Auld's user avatar
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Create contour lines (interpolate from existing vector data)

I am a QGIS user. I have vector lines (shapefiles) with 0, 5, 10, etc. values and I want to create (interpolate) contour lines between these lines with values 1,2,3,4, 6,7,8,0, etc. How can I do this?
Darko Ćorković's user avatar
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Join KML with CSV and conduct Interpolation

I have a KML file created in Google Earth that has points where we sampled 11 monitoring wells (my work uses Google Earth Pro and I'm trying to introduce QGIS). I have a CSV that has the contamination ...
BiosphereEngineering's user avatar
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DEM update/interpolation algorithm from control points

Context: I have a reference DEM, and Icesat-2 points covering some parts of it. The DEM is from 2012 and the Icesat-2 points range from 2018 to 2023. Goal: I am looking for a way to 'update' the ...
vdc's user avatar
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Fill NA cells accross rasters

I have a raster stack (spatraster) with 129 layers. The layers are monthly images from Landsat-8. A lot of cells contain NA values due to clouds. My goal is to fill these NA pixels with some sort of ...
Nikos's user avatar
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3D interpolation visualization with ArcGIS Pro

I would like to use the result of a global polynomial interpolation as a base for visualizing a 3D model in the local scene view in ArcGIS Pro, but I always get back a flat layer in the local scene ...
and2103's user avatar
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ArcGIS JS API RasterShaderReliefRenderer does not color full range of DEM elevation values

I have a DEM of the state of florida as an ImageService, here. I want to render this DEM using nicer colors than black and white using the ArcGIS JS API. Following the example ImageryTileLayer - ...
Seth Lutske's user avatar
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Groundwater interpolation using kriging with external drift

I have a bunch of groundwater measurements that I would like to interpolate taking into account the ground elevation. For this, I was advised to use kriging with external drift. I have tried different ...
stray_dog's user avatar
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DCELL cell type is set automatically for raster after r.resamp.interp

After interpolation with r.resamp.interp with bilinear method DCELL cell type is set for raster. When I export it with r.out.gdal I get a precision loss error, as I export it as Float32 (PCRaster ...
Nikolay Yasinskiy's user avatar
2 votes
1 answer
100 views

Finding interpolated value from raster data in PostGIS

I have a series of values that were computed for each cell on a grid on a given territory. Those values has been stored in a raster field in PostGIS (there are no missing data). I want to run a query ...
Thibault J's user avatar
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gdal_fillnodata strange artifacts

I'm seeing an odd artifact when using gdal_fillnodata.py. I have a raster (purple is no data, white and black are two different numeric values). Using a mask exactly corresponding to the no data ...
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LineString length obtained from shapely differs from actual real distance [duplicate]

I want to obtain the points of a LineString that are at a distance of 25m from the first point and from the last one of said LineString. I was doing some tests to check whether or not Shapely could be ...
Jon's user avatar
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Create heatmap polygons shapefile from a points shapefile for a variable in attribute table in R

The objective is to create heatmap polygons from a points shapefile named "df_sf" for an attribute "V1" in the shapefile and then export these polygons as another shapefile in R. ...
vp_050's user avatar
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How to show point data as a colored map?

Im doing one, I would say, simple analysis, but Im rookie when it comes to GIS, so I need help. So, I have data of CPT (cone penetration test) which our firm conducted over the years and within that ...
Marko Boričević's user avatar
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Problem with SAGA batch processing

I have a series of point clouds in LAZ format that contain points identified as ground. I want to interpolate these points with the Multilevel B-Spline algorithm of Saga GIS and export the clouds to ...
Gerardo Jimenez's user avatar
1 vote
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TIN interpolation QGIS - Voronoi Polygons

I'm trying to interpolate 12 points in QGIS linear within a Voronoi Polygon using TIN-Interpolation created for the points. However,the extent of the raster layer only interpolates between the points ...
Gus's user avatar
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1 vote
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How to use Lagrange interpolation method for station lies between a grid?

I have rainfall data for a catchment from 1990-2020 in grid format. But my station of interests lies in the grid, how to apply the interpolation to that station. I'm not sure if I'm proceeding ...
Hydra's user avatar
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How to divide a geographic area into N latitude and longitude quadrants

I would like to get the NW1,NW2,...NWn and SE1,SE2,...,SEn lat and long coordinates of N quadrants starting from an area identified by 2 geographic points: NW and SE. I would like to write a Python ...
kiks73's user avatar
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Re-projecting an orthographic image to a equirectangular projection has some sort of problem. The poles are getting truncated. missing parameter?

Re-projecting an orthographic image to a equirectangular projection has some sort of problem. The poles are getting truncated. is there a parameter I am missing? Is there a difference between "...
Molly's user avatar
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Interpolating flood surface using Topo to Raster in ArcPy

I am trying to interpolate a statewide flood surface for NJ using Topo to Raster in ArcPy. I split the input points into 900 separate input point feature classes using 14-digit watershed boundaries. I ...
dejonra's user avatar
-1 votes
1 answer
193 views

Can't open IDW interpolation while I'm using QGIS 3.34

I can't open IDW and TIN interpolation. How can I solve the problem?
Kelvin的地理空間's user avatar
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39 views

Add missing values to raster data set [expand, not fill holes] in QGIS

I'm relatively new to QGIS and have run into the following problem. I am using a raster soil data set that was cut to the country border. However, since the cut was rough and my research area is set ...
lappelsien's user avatar
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44 views

Working on manual NTv2 bilinear interpolation

I asked this on the Math Exchange as Iterative Bilinear Interpolation on Quadrilateral, but I figured I'd also post it in here to see if I could get some insight from some GIS folks. I think it is a ...
Tkbacon's user avatar
1 vote
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63 views

Problem interpolating point shapefile QGIS

I've been having a lot of problems trying to interpolate some topographic point data from the coast of Japan. The data consist on regular separated points 10 meter apart. I've tried to interpolate ...
GeronimoP's user avatar
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Python: interpolate dataset to create a global map

I have a NetCDF dataset (this) with values for the world's oceans. The measurements are in the form of unevenly spaced points: Now I want to extract some values at specific locations. My problem is, ...
terauser's user avatar
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1 answer
143 views

Interpolate a GeoJSON file [closed]

I have a GeoJSON file which consists of rainfall data in a location. I want to interpolate those point data in GeoJSON and make a raster file, and display in Leaflet map. How can I do this?
Srijit Sharma's user avatar
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25 views

QNeat3 Polygons do not finish calculating interpolation

I have been using QGIS for a couple of years and used QNEAT3 for the first time around one year ago. I never had any problem with it but, after some months not using it, I tried to use it again to ...
Jose Cáceres's user avatar
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78 views

Creating Raster from CSV in QGIS - Huge filesize

I am attempting to create a magnetic map of Northern Ireland using this dataset (https://www.opendatani.gov.uk/@geological-survey-of-northern-ireland/gsni-tellus-regional-airborne-geophysical-survey-...
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vis.gam spatial interaction output as a raster grid instead of plot object

I am trying to create an object that can be put into tmap or another GIS platform from my model output. I created a model using the gamm4 package that has a spatial interaction term. See an example ...
megsruppUNBC's user avatar
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1 answer
52 views

Minimum datapoints for Kriging

Are the datapoints (34) for this Kriging operation sufficient? Research Gate recommends > 30. [both -> here and here], while another source [-> here] mentions 30 to 50. All mention Webster ...
arkriger's user avatar
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Unable to get the road network distance between two points in PostGIS

SELECT sf.id, sf2.gid, SUM(ST_Distance( sfroads.geom, ST_LineInterpolatePoint(sfroads.geom_latest1, ST_LineLocatePoint(sfroads.geom_latest1, sf....
mangotree's user avatar
3 votes
1 answer
96 views

Create conical gradient around a point using R

I have a point on a map that I am simulating bird movements from. I'd like to create a raster grid around this point with a conical gradient, similar to the picture below. The idea is that the birds ...
srha's user avatar
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Coordinate-based interpolation of values in time series format

I have three different streamflow gauge station points along a river. For each point, I have streamflow values as timeseries. Between these station points (Red triangles on the map) I have additional ...
Husamettin Taysi's user avatar
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Using data for interpolation in Geostatistical Wizard of ArcGIS Pro

i do have soil temperature data (5 cm depth) from 1991 and 2021 for Germany, and wanted to interpolate the data for each year as a class of 3 seasonal months (winter = 12, 1, 2; summer = 6, 7, 8). ...
vaber32's user avatar
1 vote
1 answer
61 views

Improving kriging results from transect data

I have estimates of fish density along transects from a lake and would like to extrapolate these estimates for the entire lake surface, using kriging methods. Based on information from here, here and ...
M.Teich's user avatar
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1 vote
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67 views

ArcPy IDW interpolation with LiDAR point cloud data

There are several questions such as 1, 2 etc on interpolation, but, when I implement the same procedure to calculate digital terrain model from point cloud I get an error: las_path = r"C:\Users\...
User2010's user avatar
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2 votes
1 answer
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Switch begin and endpoint in profile graph - ArcGIS Pro

I created a profile graph in ArcGIS Pro. The TIF file that I use to create the profile, via the function "Interpolate Shape", contains the elevation in Europe. The line that I created starts ...
Foeke Boersma's user avatar
1 vote
0 answers
94 views

Convert a pixel-aligned grid to node-aligned [closed]

Given a regular grid of squares with sample points at their centres (a pixel-aligned grid), what would be the best way to interpolate to the corners of the squares (a node-aligned grid). I'm aware of ...
J.J. Green's user avatar
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119 views

Find and select local maxima on a raster

I'm trying in ArcGIS to obtain local maxima from a raster (for example a DEM) calculated with a circular sliding window of constant radius. Is there a way to pick up and select the local maximum ...
Marco Fioraso's user avatar
0 votes
2 answers
166 views

Bilinear interpolation of a matrix to extract Z at different locations [R]

I have that geoid heights (quasi-geoid model hBG18) in a form that matrix : library(tidyverse) Geo <- read.table("https://www.isgeoid.polimi.it/Geoid/Europe/Belgium/public/hBG18.dat", ...
C. Guff's user avatar
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3 votes
0 answers
699 views

Resample() function in R's terra package and the r.resamp.interp module in GRASS GIS yield such different rasters

Comparing the results from the resample() function in R's terra package (version 1.7-29), and the r.resamp.interp GRASS GIS module (version 8.2), I find differences in how they apply bilinear ...
Eden's user avatar
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0 votes
1 answer
66 views

Spatial Interpolation of Point Layer with Count and Associated P-Value

Here's quick synopsis of the data I have. I have a dataset of just under 100 points with most points being coincident with several other points resulting in roughly 15 unique locations. Each point ...
TreeGIS's user avatar
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1 vote
1 answer
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How to make interpolation and contour for recording distances on images?

I have a question about interpolation and contours. In the images from the animal observation cameras, we would estimate the distance from the camera to the animal. In theory, we had the idea of ...
Tim Pirc's user avatar
1 vote
1 answer
63 views

Extracting points in a regular interval from TIN-Interpolation raster in QGIS

I had million of points with x, y and z. I could not filter them in QGIS in order to get them in an interval of every 0,9m. So what I did is TIN-Interpolation and I do have a raster now. How can I get ...
Ditila's user avatar
  • 13
2 votes
1 answer
32 views

Error with pycnophy R function from predicts library

I am attempting to use the pycnophy() function from the rspatial/predicts library. Upon prepping county level data with a "population" metric and running these data through the function, I ...
geoscience123's user avatar

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