Questions tagged [interpolation]

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

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Alter cell size of gdal_grid command

I'm using the below command in the GDAL commandline to grid a shapefile using IDW interpolation gdal_grid -a invdist:power=2.0:smoothing=1.0 -of GTiff C:/users/public/test.shp C:/users/public/test....
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QGIS use a reference layer for IDW interpolation

I am using QGIS SAGA IDW Interpolation tool to interpolate my single-beam data which contains gaps. I was just wondering is it possible to use a reference layer to help with more 'accurate' ...
-1 votes
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Which interpolation method is best for calculating a peak elevation from a DEM?

I want to estimate accurate elevation of a peak from a digital elevation model. I know the location of higher pixel in the DEM. But the actual elevation is higher. I must use an interpolation ...
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PyKrige interpolation results very different to ArcGIS Pro

I had been using ArcGIS Pro's Kriging tool to apply Ordinary Kriging to my dataset. This produced the below results, which were exactly as I wanted (I have also included a screenshot of the parameters ...
5 votes
1 answer
138 views

Interpolation on grid using QGIS

I am completely new to QGIS. The problem I have is finding away to interpolate the data on the grid. I'm not sure if you can do it or not. Can you point me in the right direction? Data I have at the ...
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1 vote
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PyKrige constantly running into memory errors even with small dataset

I have an xyz file in which I'd like to apply the interpolation method of kriging to via python. In order to do this, I have come across the module PyKrige and duplicated this example perfectly on my ...
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1 answer
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Using PyKrige for ordinary kriging on an XYZ file

I've previously used ArcGIS for Ordinary Kriging, but I now need a Python alternative. I found the PyKrige module which i decided to give a try, but I am bit confused by it. So far, I have read my XYZ ...
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How to perform areal interpolation (spatial downscaling) with Tobler (Pysal package)?

I need to perform a spatial disaggregation of census data. I'm doing it using Pysal's Tobler subpackage, through its model based function, which is a Generalized Linear Model (GLM). I have a original ...
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How to interpolate a point between two points in Oracle

I have an Oracle database table which stores points of a track of moving objects. object_id geometry timestamp 1 ... 1970-01-01T00:01:00 1 ... 1970-01-01T00:02:00 1 ... 1970-01-01T00:03:00 2 ... ...
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2 votes
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GDAL GRID Linear Interpolation Creating a Non Continuous Raster

I am using the GDAL GRID algorithm to create a raster from points using the Linear method. The points I have are generated from the river cross-section lines, and all have the same z value per line. I ...
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Kriging Interpolation in ArcMap

I want to interpolate one field of the shapefile named 'Interpolation' by Kriging method. But want to change the processing environment to the extent of another file namely 'Polygon'. I tried '...
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2 votes
1 answer
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Save scipy interpolations as a raster (GeoTIFF) format using Python

I am using scipy.interpolate (Python 3.9) to interpolate some data. However, after using a nearest neighbor interpolator, I need to save it as a raster (GeoTIFF) image, preserving the resolution of 0....
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Natural Neighbour Tool not working - Error not specified in Log

I am attempting to use the Natural Neighbour tool to interpolate polar gridded points. I am using "SAGA Next Gen"'s tool since SAGA is apparently incompatible with QGIS versions after 3.16. ...
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1 answer
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Interpolating between discontinuous contour lines and simple dots

I am trying to find the depths corresponding to purple point locations (given in picture). Depth information is given in contour lines. The main purpose is applying linear interpolation but I don't ...
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Areal Interpolation polygon to polygon using ArcGIS Pro

I am using ArcGIS Pro 3.0.0. I have two multipolygons and I would like to interpolate the values of one polygon to the other. I found the Areal Interpolation tool which does exactly that. One of ...
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Linear interpolation for missing dates in Google Earth Engine

I have missing dates with no data which I want to create data for using linear interpolation. Most examples create a masked layer and replace the masked values but its my understanding that to ...
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Incorporating Add Data step in ModelBuilder for ArcGIS Pro to create multidimensional raster from NetCDF file

There are functions in ArcGIS Pro to read in NetCDF files and create a single value raster but in order to create a multi-dimensional raster one needs to use Add Data and select multidimensional ...
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Linear data imputation conversion to bilinear interpolation in Python?

I have a project where the task is to impute missing data values from a modis TIF file using Bilinear interpolation. I tried to use linear interpolation to impute the missing values, but trying to ...
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How do I Fix TIN Interpolation Missing Corners?

When I'm TIN interpolating an area. The corners are missing. I know how to fix it to a certain extent but when there is a lot of water I have an issue filling in the whole area. This is the ...
1 vote
1 answer
152 views

How to deal with Nan value when using rioxarray rio.reproject()?

I was trying to use rio.reproject_match() to match the resolution of two xarray datasets. However, when I used resample methods like Resampling.bilinear or Resampling.average, a large area would ...
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Cloud masking (S2cloudless) and temporal gap-fillin interpolation on GEE (using Python API)

I need a time series of Sentinel-2 images freed from clouds and with the masked pixels of each image replaced by interpolated values (linear over time). Thus, first, I applied the cloud mask as ...
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1 vote
1 answer
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Spatial raster data interpolation in Google Earth Engine (GEE)

I have calculated the monthly ET from the 8-day MODIS data: // Region of interest var roi = ee.Geometry.Rectangle([26, -24, 29, -27]); // Calculate monthly MODIS var monthly_sum_MODIS = ee.List....
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Cannot resample min-max ranges on QGIS neither defining its NoData points

I have downloaded the blue marbel next generation with the topography of the ocean. The issue is that I am using a third party library that is configured to read geotiff rasters. Well, I'm using said ...
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2 votes
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51 views

TIN Interpolation - QGIS

I have a doubt and I would like to know if someone has the answer for it. The TIN Interpolation tool let you add several attributes to be interpolated. While selecting several, the result is ONLY 1 ...
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Kriging output is blank

I have used kriging with default settings where I have five points with XY coordinates, ID and concentration. The concentration is ranging from 12 to 161900. The output I get from this is just a ...
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How to detect curves and straight paths using GPS coordinates?

I'm working on a project involving railway tracks and I'm trying to find an algorithm that could detect curves(left/right) or straight lines based on time-series GPS coordinates. The data contains ...
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Calculating missing points on line vector in QGIS

I have a linear vector of a river subdivided in 55 traits, all connected to each other. In 5points along the river i toke some measurements. What I want to do is to calculate the values in the 50 ...
3 votes
1 answer
703 views

Interpolating series of points between two locations using Python [closed]

Let's say we have two addresses that are provided. I grabbed two random ones from the web below: # Google headquarters: google_lat = 37.422131 google_lon = -122.084801 # Apple headquarters apple_lat =...
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Advance a Interpolation

Hello I would like to interpolate my data with Universal Kriging (UK). As you already know, with UK a drift is assigned to the data! I would like to make the data dependent on the altitude as the ...
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1 vote
1 answer
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Interpolate specific areas of raster layer

I want to interpolate height (Z) values in a raster layer. The problem is that there is a body of water with no data in the middle of it and the overall area is not square; so also no data around. Is ...
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TIN Interpolation method in QGIS

I am trying to interpolate 6 vector points in QGIS using TIN interpolation. However, I keep getting an error msg. For some unknown reason, it won't complete the interpolation. How can I fix this?
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Join shapefile to a raster created by interpolation (IDW)

I want to join this raster to a shapefile; I created this raster by IDW, it is rainfall information for my country and the shapefile it is for all the townships. I want to know the exactly rainfall ...
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Is ArcGIS Pro result for interpolation correct?

I did a Diffusion Interpolation with barriers (uses kernel). My real maximum value for Turbidity is 80, but in interpolation raster maximum value is only 34.82. Could it be considered correct for the ...
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2 answers
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Interpolating using ArcGIS Pro [closed]

I have 2 datasets. They have exactly the same columns and the data for the second dataset was collected the day after first dataset. When I perform Diffusion interpolation with barriers on the first ...
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6 votes
3 answers
155 views

Replica of point layer data from attribute value in QGIS

I am working in QGIS 3.2 and am wondering how I can create an "exploded" version of a single layer of point data based on numerical attribute values within that layer. As a simple example, ...
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1 vote
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Interpolate on ocean data points without considering land points using Arcmap

I have some ocean data points, and I am trying to interpolate them to create a raster. After interpolating with IDW, the land area is also filled with data. How can I only interpolate the data on the ...
1 vote
0 answers
207 views

Method of interpolation to create weighted heatmap rasters in R from point data

I want to create a geospatial heatmap that is weighted by a specific variable sourced from georeferenced points. An example dataset is 'us_states' from the 'spData' package. I want to take this data, ...
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2 votes
2 answers
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Missing the raster interpolation plugin in QGIS 3

I can't find the Raster ‣ Interpolation plugin in QGIS 3, I tried to search for it through the plugin's installation applet following this tutorial and searched for 'interpolation', but it doesn't ...
1 vote
1 answer
37 views

Interpolate XYZ data to give accurate raster output

I have XYZ Bathymetry Data which I would like to turn into a raster using the minimum value or shoal biased in QGIS. I've tried using the rasterize - vector to raster function, but I can't change how ...
1 vote
0 answers
35 views

Anti-alias raster layer by upscaling/ resampling

Recently, I performed a VGA analysis using Depthmap X. I moved the date over using a Mapinfo file (vector) and rasterised the values to the associated pixelsize. The analysis was conducted at a 2m ...
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1 vote
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Using Point Data to Predict Similar Occurrences in the Future? [closed]

To provide a brief background: I have 5 years of conflict point data which is just a cluster of all years together. Additionally, I have point locations of power plants. The goal is to use the ...
0 votes
1 answer
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Interpolated DEM RMSE

I'm trying to figure out the 'true' error associated with interpolated cells in a DEM, which itself is known to have a RMSE of 0.15m. DEM has RMSE of 0.15 Interpolation model shown by cross-...
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1 answer
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How can I use "spline" or Interpolation on a UK Map? [closed]

Basically, I have a number of data across a number of UK cities (London, Aberdeen, Birmingham, etc.). I want to plot them onto a map and then use something like a "contour map" to get ...
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ArcGIS kriging unable to estimate semivariogram when processing extent is set

I'm trying to use ArcGIS kriging tool to interpolate some points to form a raster. The point covers approximately a polygon study are but not exactly the extent of the area. I set the processing ...
1 vote
0 answers
23 views

Rounding imprecision when performing area-weighted interpolation of population (discrete) data

I guess this is more a conceptual question. I'm performing area-weighted interpolation between two very granular geometries, and I have three variables: population_total, population_men and ...
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Appropriate kriging variogram model and parameter values in order not to loose information?

I have tried to apply kriging in order to interpolate the measurements to a regular grid. The function that generates the grid is the following: from pykrige.ok import OrdinaryKriging def ...
0 votes
1 answer
51 views

Taking average of long term daily rainfall values if it contains lots of zero values

I wanted to interpolate my daily rainfall data into ArcGIS for visual representation. I have almost 10 years of daily rainfall data which contains lots of zeros. When I take the average daily for ...
1 vote
1 answer
191 views

Geographically weighted area-to-area Regression CoKriging for raster downscaling in R?

this will be probable a series of questions, so in this one I will try to set the big picture. I want to perform geographically weighted area-to-area regression Cokriging (GWATARCoK) to downscale 1 ...
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1 vote
1 answer
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TIN-Interpolation doesn't fit coordinates

I am working on a project for the university and have to use TIN-Interpolation to analyse the raster. I have the issue that the raster doesn't fit to the points. I found a post that recommend to ...
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1 answer
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Interpolate temperature values (with associated lat and lon values) at different depth intervals using Krig function in the 'fields' R package

I have temperature data points in different depth intervals with associated lat long values across the study area. I want to make a raster and then interpolate between cells of the raster where there ...

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