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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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2answers
52 views

How to densify point feature class in ArcGIS?

I have a 3D (x,y,z) single point feature class which points are equally spaced, like this: As the distance between each points are more than one meter, I was wondering if there's a possibility to ...
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0answers
63 views

Problems with SAGA on QGIS

I'm trying to perform an interpolation on SAGA in QGIS but every time I ran the tool (or any other SAGA tool for that matter) I got the following message: "The following layers were not correctly ...
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1answer
40 views

Seeking ArcGIS TREND tool equivalent in R?

Arc features the TREND function with linear interpolation up to 12th order. Is there an equivalent approach in R (preferably) or python? I'm trying to de-trend a raster surface using polynomial ...
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0answers
29 views

Exporting string and float variables to ASCII file using ArcPy?

I am trying to create a script using arcpy to automate a serie of task in ArcGIS. What I am trying to do is to interpolate rainfall data from a region and then, using hydrological basinshapefiles, ...
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1answer
33 views

Is the natural neighbor an exact interpolator in ArcGIS

Is the natural neighbor ( or even nearest neighbor) considered an exact interpolator? I believe splining or kriging could be considered exact... but what about the natural or nearest neighbor?
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2answers
53 views

How do I combine these two rasters?

I have a raster representing rivers/drainage basins within a terrain: I have a raster DEM of the terrain: In the basin raster, everything in black is 9999. White is nodata. The DEM is obviously a ...
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0answers
16 views

SpatialAnalysisTools (GPServer) > InterpolatePoints missing class values

I have been working on generate results using InterpolatePoints tools and consume it in our Web Application using these request parameters: { inputLayer: featureCollectionObj, field: "POP", ...
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1answer
79 views

How kriging variance is calculated in R gstat?

How does exactly the krige function (a wrapper to gstat and predict functions) from package gstat calculate kriging variance (minimized estimation variance) in Ordinary Kriging? I wanted to reproduce ...
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1answer
57 views

Removing black lines between merged tiles?

I merged several rasters, but there is a problem with lines between sheets. Raster is created from LiDAR datasets. Rasters were produced from different datasets via this application: https://iaps.zrc-...
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0answers
25 views

Interpolate and export the following points

I have two crossections of the same position. I am looking for a way to interpolate the blue points from the attached image. I need the xyz values of the interpolated points, how can I do this? I ...
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0answers
38 views

spatial zones interpolation

I work on QGIS platform and I have a question regarding presenting my spatial data. my data contain: vector layer of points that were taken in a field contain very dense data (see picture). I ...
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0answers
22 views

Find collinear points

I am trying to interpolate a grid data using spline tool using ArcGIS Pro. When I ran the tool the raster was generated but with lots of warnings saying Inspect your input data for potential ...
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1answer
61 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 ...
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0answers
20 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?
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1answer
57 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 ...
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1answer
47 views

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

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.
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0answers
40 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 ...
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0answers
37 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 ...
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0answers
224 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 ...
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1answer
49 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 ...
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1answer
46 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/...
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0answers
34 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 ...
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0answers
25 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 ...
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1answer
47 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 ...
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0answers
254 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 ...
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0answers
22 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 ...
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1answer
42 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 ...
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1answer
61 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 ...
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1answer
59 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 ...
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0answers
40 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, ...
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39 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....
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1answer
44 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 ...
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0answers
40 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. ...
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69 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 ...
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1answer
35 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 ...
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0answers
66 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 ...
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0answers
77 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 --...
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0answers
61 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 ...
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2answers
179 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 ...
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0answers
22 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 ...
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0answers
139 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 ...
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0answers
51 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 (...
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2answers
88 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 ...
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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 ...
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2answers
39 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 ...
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0answers
50 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 : ...
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1answer
39 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 ...
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2answers
125 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: ...
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0answers
24 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 ...
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1answer
38 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 ...