Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [interpolation]

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

0
votes
1answer
38 views

Choosing interpolation method for grid data?

I have a grid data of evenly spaced points that gives the number of people with a facebook account within a certain radius (approximately equal to the mid-distance between to points). From that I'd ...
1
vote
0answers
18 views

Python function like SAGA Grid Gridding?

For a python script, I'm searching for a function that does the same as SAGA Grid gridding, an exponential interpolation on GeoPandas GeoDataFrame. Does anyone know one?
0
votes
1answer
19 views

Kriging method vs. IDW in soil moisture interpolation

I have XY coordinates and soil moisture values for a grid of 10m and I used add XY data to import my excel data to ArcMap 10.5. I applied both IDW and kriging methods for interpolation. The results ...
0
votes
1answer
35 views

How to use inverse distance to a power algorithm in R(not weighted)?

Can some one provide an example R code to replace the GRID (inverse distance to a power) interpolation algorithm in QGIS. I am looking for R code.
1
vote
0answers
31 views

Trying to interpolate depth measurements of a pond

We have taken depth measurements across a pond, and have a CSV file with each location's GPS coordinates and depth in meters. We are trying to create a map of this pond showing where the channel is ...
1
vote
0answers
31 views

Error interpolating in Qgis

I'm trying to interpolate with the algorithm "v.surf.idw" in Qgis version 2.18 Las Palmas. The data that i'm using are points whose coordinates were loaded by a CSV file, these the guade as a new ...
0
votes
0answers
23 views

Error in model.frame.default(formula , drop.unused.levels = TRUE) :invalid type (S4) for variable ''

I have to predict soil organic carbon (SOC) through regression kriging using elevation (DEM) and NDVI data as covariate both of 30m resolution/cell size. Data of SOC at X and Y locations is in txt ...
2
votes
1answer
30 views

Expanding IDW interpolation to borders of country in ArcGIS Pro? [duplicate]

I am new to ArcGIS. I have a data set with air pollution concentrations for 20 locations in the Netherlands. I would like to interpolate this data with IDW, so that I can estimate the approximate ...
0
votes
1answer
35 views

Not correct numeric value error using Multilevel B-Spline interpolation with SAGA and QGIS?

This is the generated log: Processing algorithm… Algorithm 'Multilevel b-spline interpolation (from raster)' starting… Input parameters: { 'DATATYPE' : 0, 'EPSILON' : 0.0001, 'GRID' : '/Users/...
0
votes
0answers
24 views

Format of data for doing the IDW interpolation in R

I have time-series of precipitation for a 30-year period for three climate stations that are situated out of the catchment of interest. I have to obtain the spatial distribution of precipitation, the ...
0
votes
0answers
20 views

Interpolating raster as means of resampling?

I am working on a set of temperature projections (NetCDF files) that are all based on different projection systems. They need to be reprojected on a single grid in order for any comparison to be ...
1
vote
1answer
42 views

QGIS Mask - Error Code

I am trying to interpolate points and then clip the interpolation with a Raster> Extraction> Clipper. I receive an error code after trying to mask over the region I am interested in. Would you ...
0
votes
0answers
78 views

Performing interpolation to create heatmap in Python?

I'm doing lots of interpolation to create heatmaps in QGIS recently and would like to move everything to Python to complete my workflow in one place. I've found some tutorials like this post and this ...
0
votes
0answers
19 views

Making error or confidence surface in ArcGIS Desktop?

I have a student working in my GIS lab who is computing an IDW interpolation surface for observations taken from a boat moving along a series of paths. The sampling paths were not uniform over the ...
0
votes
1answer
34 views

Exporting contour lines to x-y-z raster in ArcGIS Desktop?

I am using ArcGIS 10.5 and have a shapefile containing contour lines. I would like to get the height values at equidistant positions. In other words, I would like to interpolate and sample the contour ...
0
votes
1answer
46 views

Performing IDW interpolation in QGIS?

I am fairly new to to QGIS and I am trying to create a contoured map from point data. The points are regularly spaced at 3.5 metres apart and whenever I try and run the IDW interpolation in QGIS 3 it ...
0
votes
0answers
22 views

Interpolating weather data with constraints?

I have several weather stations that have precipitation and temperature. I need to interpolate to check the weather at specific points. I used Kriging (tried linear, Gaussian, and spherical). After ...
0
votes
1answer
57 views

Spatial distribution based on point data

I have a specified geometric boundry with three data sets that correspond to rainfall measurements at three stations of which two are outside of the geometry and one inside. I would like to find a ...
1
vote
0answers
31 views

Different variations of point-to-zone mapping

I have created a grid of 1Km2 over some census zones. Now, for each cell of the grid, I need to provide some characterization of it: population, socio-econ, etc. coming from the census zones. So, ...
0
votes
0answers
30 views

What is the procedure for getting IDW raster from group of points?

It is clear that the IDW uses inverse distance based average to get value of a particular point. However, the algorithm also provides interpolated value for an area by specifying x limits and y limits....
2
votes
1answer
37 views

How does bilinear resampling work when converting a 10 meter raster to 30 meter?

There is a 10 meter resolution land cover raster. An analyst wishes to resample 10 meter raster to 30 meter raster. The analyst selects the Bilinear Resampling technique in the Resample tool of the ...
0
votes
0answers
39 views

QGIS - how to extract interpolated elevation from a raster? [duplicate]

I maintain my own database of oil well information with thousands of curated points. I have lat, long, and subsea elevation. This information was used to create a raster and a set of contour lines. ...
0
votes
0answers
52 views

How to interpolate Landsat missing values after exlcuding cloud masks in google earth engine?

I want to generate the annual mean NDVI from Landsat in Google Earth Engine. However, after excluding bad observations caused by clouds and shadows, the mean composite of remaining Landsat data will ...
0
votes
1answer
33 views

Create raster surface from points with barrier

I have a point layer, that represents an elevation in that given point. This I need to create a raster/surface/DEM from, preferably by interpolating by Nearest Neighbour method or some way Liniar ...
1
vote
0answers
56 views

Interpolation in QGIS shows wrong output result [closed]

I have done interpolation (IDW and Nearest Neighbour) in QGIS. But interestingly the output shows the wrong result. The area where I have a huge number of points results in a lower Z value (it is ...
0
votes
0answers
64 views

GDAL interpolation ignores edges with nodata vals

I have a grib file with weather data in 0.25-degree resolution and I want to upsample its higher resolution. I used gdalwarp: gdalwarp -t_srs EPSG:3857 -of GTiff -wo SOURCE_EXTRA=1000 -wm 2000 --...
0
votes
0answers
50 views

Using rasterFromXYZ in R for QGIS under Krige-Baye

I am trying to run the script below in R for QGIS to produce a raster result. Everything runs fine but the image is not produced since the command rasterFromXYZ encounters a mismatch of elements in ...
4
votes
2answers
121 views

Interpolate smoothly nodata values in QGIS

I have a DEM raster where all the buildings have been extruded and now contain "nodata" values. I'd like fill the holes and get a nice and continuous surface (which would approximately correspond to ...
0
votes
0answers
17 views

Polygon interpolation neighbour average?

I am trying to estimate empty values based on a polygon layer we received from another study. Is there a way to calculate an average value for polygon A based on neighbours B,C, etc that border it? I ...
4
votes
0answers
105 views

GDAL grid Not recognizing csv as having geometry

NON-DUPLICATE EDIT: This question is not a duplicate because I have tried the solution presented as the answer to the "original" question and it did not work. See results below. I am attempting to ...
0
votes
0answers
41 views

How to interpolate ibutton transect temperature data ArcGIS

I have three transects on opposing slopes. Each transect has ibutton data loggers set to record temperature at hourly intervals. The loggers are spaced at 20m altitudinal intervals from 1550 - 1810m (...
0
votes
2answers
71 views

Line_interpolate_point: 2nd arg isnt within [0,1] in PostGIS

Im trying to interpolate a point on edge using ST_LineInterpolatePoint but it is giving an error saying that Line_interpolate_point: 2nd arg isnt within [0,1]' create table interpolate as ( select ...
1
vote
1answer
41 views

Plotting monthly SO2 map [closed]

I need to plot a map to show monthly SO2 emission point over a specific area. To do so, I have an Excel monthly dataset (derived from satellite data) contains a column for latitude, a column for ...
1
vote
2answers
36 views

Creating precipitation raster map in GRASS GIS?

I am trying to create a potential erosion map of my basin for which I require a rainfall distribution map. I have 3 stations' rainfall data for the year 2007- 2015. How do I create a rainfall map in ...
0
votes
0answers
36 views

Multilevel bspline interpolation

I'm trying to do ‘Multilevel bspline interpolation’ in QGIS using Python console, but I am getting errors such as “Algorithm not found ” and “wrong number of parameters.” Here is my code : ...
0
votes
1answer
35 views

Iterating Fields in shapefile and exporting after interpolation geoprocessing?

I have two shapefiles to be used for interpolating data. The first is a survey point with the following attributes: The second is a boundary file (Polygon) with the corresponding descriptions as an ...
2
votes
2answers
82 views

Usage of interpolation methods with DEMs: Linear vs. natural neighbors

Using the ArcGIS tool "TIN to Raster" (3D Analyst Tools --> Conversion --> From TIN) to work on my Digital Elevation Model I was wondering about the interpolation methods. I can choose either or: ...
0
votes
0answers
13 views

Tin Clip (EDIT TIN) not working. segmented. Tin Mostly vanishes from Polygon

This seems like an issue which should be easy to fix. Although I cant find out how to. I am creating a TIN of water surface height from polylines (which works) as you can see. Longer lines are to ...
0
votes
1answer
35 views

Interpolation of holes resulting from DTM groundfiltering of SfM pointcloud

I am wondering if there is an efficient interpolation method to close the holes in a dtm resulting from groundfiltering. At the moment I am directly interpolating the point cloud to a raster using ...
0
votes
0answers
28 views

Using Kriging Tool for estimation in ArcGIS Desktop?

I'm working on an Exploration Project where i have few information about underground geological layer (for example: Phosphate). The wells with brown color present the known data (That we'll use for ...
0
votes
1answer
78 views

Error in gstat.formula.predict(d$formula, newdata, na.action = na.action, : NROW(locs) != NROW(X): this should not occur

I'm trying to perform regression kriging using the code creating variogram m <- vgm(var(soil$Ba), "Sph", sqrt(areaSpatialGrid(slope))/4, nugget=0) v <- fit.variogram(variogram(Ba~RASTERVALU, ...
0
votes
1answer
225 views

Could not create destination layer

I am using QGIS 3.0.3 to make a heatmap using processing toolbox, kernel density estimation. The input I am using: I have generated centroids from polygons using Vector --> geometry --> centroids ...
1
vote
1answer
161 views

How to extract specific values with point coordinates from Kriging interpolations made in R?

By using R version 3.4.2 and the library "geoR", I made kriging interpolations for different variables (bellow I give an example of my process). I also made a matrix with the coordinates for 305 trees ...
1
vote
0answers
52 views

Can I control how GDAL interpolates the edges of an array?

I am currently using GDAL 2.1.0 in a Python script to reproject a geotiff with a given pixel size into an other geotiff with the same projection, but with a different pixel size. To do so, I use the ...
1
vote
0answers
41 views

Qgis Interpolation TIN from srtm

I'm new in qgis and I'm trying to realize a DEM from contour follow this tutorial https://www.youtube.com/watch?v=Lzd5m0j3zTI&t=81s My data came from seven SRTM frame downloaded with plugin in ...
1
vote
1answer
80 views

Interpolating within a boundary using QGIS

I am interpolating species density in a tidal flat however I would like to limit my interpolation to the sampled area in the tidal flat. I tried making a shapefile of the sampled tidal flat area (...
0
votes
0answers
35 views

Grass gis - 3D data set interpolate to 3D raster

I have a dataset of 70,000 points and I would like to interpolate the properties as a 3D raster. I have created 'slices' of properties each meter of elevation in the model domain; approx: 200 slices. ...
0
votes
1answer
33 views

Using modeled surfaces together to make predictions?

My question is about stacking multiple rasters of predicted surfaces, that have some of the same predictors. For example, if I make a predicted surface using all the terrain attributes as ...
4
votes
1answer
144 views

Preparing dataset to perform co-kriging in R gstat?

This is the first time I'm using co-kriging in gstat. My problem is that I'm not sure how to prepare the data frame to supply to co-kriging when the variable of interest and auxiliary variables are ...
0
votes
0answers
19 views

Basic Procedure, asign value to point data, Interpolation of point data

I have a set of coordinates (kml-files) and a set of values (infiltration rates) that i want to assign to these points in order to then create an Interpolation of these values over a given area. Now I ...