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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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7 views

Iterating through fields of shapefile for batch interpolation? [on hold]

Here's my difficulty. I know there's no way to iterate through the fields of a shapefile using the ModelBuilder in Arcmap. But, I know there must be a way to do it using arcpy. But, my skills with ...
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0answers
44 views

Interpolation of data points

I have a layer of points that represent bus stops. Each point has a value (quality of service, between 0 and 100). I need to create a grid (resolution 25m) by interpolating the points values. For ...
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0answers
28 views

Generating surface area from irregular sides using R?

I want to frame my question based on the image below. I have 4 columns of data in Excel format -- a1, a2, a3, and a4. The 4 columns are the 4 sides of the image as shown, with the data representing ...
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1answer
26 views

Select features and run multiple Interpolations for 2d raster from points in batch mode [closed]

I would like to run over a 100 interpolation in sequence in QGIS, based on different selected features (elevations), which I would like to select based on a table with ranges, and then I would like to ...
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1answer
21 views

Understanding spsample in R?

I have read the documentation for this but still unsure of what the function spsample does. The documentation is here: https://www.rdocumentation.org/packages/sp/versions/1.3-1/topics/spsample I ...
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28 views

Interpolate 3D raster with Anisotropy

I am building a 3D geological model for soil deposits. I have two approaches to build a 3D raster. My dataset is about 300k points of bh information with texture and permeability at every meter ...
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26 views

Unable to select interpolation attributes from my shapefile

My point shapefile has four fields, three of which are numerical: longitude, latitude, and homicides. However, the homicides field does not appear for me to select it as an interpolation attribute. (...
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33 views

Why is the ArcMap IDW tool interpolating values higher that it's closest data points

I have a dataset of equally spaced, by 3 arcseconds, points. Each point represents the radio signal strength from a near by transmitter. I wanted to convert the point data set into a raster for ...
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45 views

Automatic creation of polygons

How do you automatically create adjacent polygons in QGIS whose size depends on an attribute of another layer? I have a layer with community areas and the corresponding number of inhabitants and ...
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1answer
38 views

QGIS - 3D data set with stacked points at different elevations, is it possible to create data points at each elevation

I have a 3D dataset consisting of xyz and property. The data points are along vertical axis (boreholes), and at different XY locations (at other borehole location). The data points are not all at the ...
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37 views

How to do kriging/IDW interpolation in GeoServer?

I want to perform vector to raster transformation. I have tried barne surface transformation. But it is not giving desired result. I have also tried on demo data it works really fine but it wont work ...
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2answers
76 views

How to use GDALGridInverseDistanceToAPower in a python script

I'm trying to use GDAL in a python script to do an inverse distance interpolation. Within the C documentation API I found GDALGridInverseDistanceToAPower function but I don't know how/if I can call ...
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18 views

Using spline / IDW interpolation for bathymetric profile of lake bed in ArcGIS Desktop?

I have partial bathymetric / topographic coverage at 1m resolution of a lake bed and shore and am trying to find an appropriate method for 'filling in the gaps'. I have tried using the following in ...
3
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1answer
51 views

Interpolate a Smooth Contour From Points

I have points scattered around some origin point, each with a score. The score should be zero at the origin (similar to distance). I want to generate smooth contour lines from these points. The red ...
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0answers
47 views

Importing several LiDAR (.las) files in GRASS using v.in.lidar?

I'm building a DEM of a terrain in GRASS and have 48 LiDAR (.las) files. I know I can do this by using r.in.lidar (including the list of files as a .txt) and then r.fillnulls However, I want to ...
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19 views

How to mask a raster layer (interpolated surface) onto a polygon layer? [duplicate]

I have performed interpolation (IDW) for average monthly precipitation and temperature values for Europe. For my project, I'm focusing on the UK and Sweden so I'm wondering can I clip or mask the ...
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2answers
27 views

Specifying which point buffers fall within a particualar land type (polygon)

I have a point buffer layer which represents tick occurrence and a polygon layer which represents landcover types (derived from Corine land cover). I want to define which point buffers (1km) fall ...
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22 views

How to create a surface layer from gridded point data of air temperature and Precipitation?

I want to aggregate monthly averages of temperature and precipitation over a 10-year period into weighted seasonal averages (DJF) for use in interpolation. I have downloaded Shapefiles for each month (...
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1answer
53 views

Cant find contour lines raster extraction

I am trying to create contour plot concentration data to a map. I followded this link and have interpolated the data as follows: but, while forming contour lines, I am not finding the raster> ...
3
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1answer
88 views

Interpolating LiDAR intensity images in R?

I'd like to generate 0.5 m intensity images using lidR, but the resulting raster is full of pits. Here's a reproducible example: library(lidR) LASfile <- system.file("extdata", "MixedConifer.laz", ...
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2answers
57 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
83 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
45 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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1answer
38 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
38 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
59 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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24 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
176 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
78 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
30 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
24 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
91 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
26 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
118 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
55 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
45 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
42 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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1answer
82 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
52 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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1answer
56 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
23 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
68 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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2answers
98 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
64 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, ...
2
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1answer
60 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
98 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
39 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
82 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
74 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 ...