Questions tagged [kriging]

A group of geostatistical techniques to interpolate the value of a random field at an unobserved location from observations of its value at nearby locations.

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13 views

Kriging for Soil Nutrient Analysis

I have collected soil analysis results on a gridded basis within fields. These grids were generated on a 35m based upon digitised polygons of the field extents. I have imported my soil analysis ...
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Understanding Kriging Standard Error

I use R to kriging the temperature, I followed the link below http://r-spatial.github.io/gstat/reference/krige.html#examples But I don't know the unit of var1.var in this code spplot (x ["var1.var"], ...
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40 views

Removing raster values using a threshold in QGIS and interpolating

I have an imagery (plant cell density) comprising vine rows and grass inter-rows.I'm trying to permanently remove all the values of inter-row grass through setting up a threshold value. The vines ...
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51 views

Interpolation for unevenly spaced data points

I am currently having some trouble finding a good interpolation technique for unevenly distributed spatial data points. Let's give a quick example : I have a 1000 points dataset. As several surveys ...
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How to add additional GRASS modules to QGIS 3.2?

I like to use the v.kriging tool from GRASS (https://grass.osgeo.org/grass7/manuals/addons/v.kriging.html) in QGIS 3.2 but its not in the processing toolbox. Is this possible to import this tool and ...
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QGIS SAGA “Kriging” tools doesn't work

I try out different methods of point interpolation for a digital terrain model. For this purpose I tried to run the "ordinary kriging tool" from the SAGA Tools with QGIS 2.18 and QGIS 3.2. When I run ...
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52 views

Seeking open source tool for 3D Interpolation

Empirical Bayesian Kriging 3D (EBK3D) looks to be the tool I need within ArcGIS. It requires a GeoStatistical Analyst license. Is there is a similar tool or library that is free and open source? I'...
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24 views

Latin Hypercube Sampling (LHS) in R

I am new to R and would like to generate Latin Hypercube samples (LHS) for three variables within the following limts: 1.25 ≤ x1 ≤ 5 , 1.25 ≤ x2 ≤ 5 7 ≤ x1 ≤ 25 with total 3*10 = 30 samples. What ...
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29 views

Spatial autocorrelation and kriging

Background I must interpolate climatic information variables for a large area (most of southern South America) for which I count on information from a relatively large dataset (more than 400 ...
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Joining z-values (from point file) to map generated by Kriging in ArcGIS Pro

I am using ArcGIS Pro 2.4.0. I am making a fertilizer application map that changes the rates, based on the location of the field. The overall goal of the operation is to create a grid of squares, ...
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22 views

Defining one numeric variable by defining another string variable (via parameter selection)

I'm creating an ArcGIS tool that will allow users to figure out how much nitrogen that a field needs based on interpolated points (Kriging). I will have the following parameters: #numeric variables ...
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Kriging error when writing ArcPy script (ERROR 000622 & ERROR 000628)

I am trying to write an ArcPy script that uses Kriging to interpolate various nutrients in the soil (i.e. nitrogen) using ArcGIS Pro 2.4.0. These nutrients were collected by sampling the soil, so it ...
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79 views

Variogram fit won't converge

I am having some difficulty fitting a variogram to the data provided at the end of this post. For context, this is baseball data where the x and z coordinates are for the location of the pitch and the ...
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Error while performing kriging interpolation in QGIS 3.8.3

I am using QGIS 3.8.3 -Zanzibar in order to perform kriging interpolation. I get this error massage: "algorithm 'Ordinary kriging' starting… Input parameters: { 'BLOCK' : True, 'DBLOCK' : 100, 'FIELD'...
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Kriging in QGIS 3.4 Problem with Variogram Model

In QGIS 3.4.13 - Madeira there seems to be a bug in the Ordinary Kriging Modul (Processing Toolbox > SAGA). When I enter the modell "1600000*x+19202*x^2" QGIS will add a second "^" leading to wrong ...
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89 views

Building Semivariogram/Variogram in QGIS

I am trying to Interpolate Point Data in QGIS using the Ordinary Kriging Modul (SAGA) from the processing menu. Is it possible to build a Semivariogram in QGIS or call the SAGA Variogramm function ...
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53 views

Define Range when calling SAGA Kriging from QGIS

Is there a possibility to define the range-value or display the Variogram when you call the SAGA-Kriging-Module from QGIS? Maybe by using the python console?
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Performing meaningful kriging in R (averaging nearby points) [closed]

I have a set of data on the quantitative composition of the particle size distribution of the sedimentary layer. I have to build a map of the distribution of certain fractions across the entire study ...
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Raster distortion from parallel kriging in R

I am relatively new to parallel computing in R. I am using a high performance cluster to perform kriging for soil data points. I found this previous post which I used as a template: How to achieve ...
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Kriging along perpendicular transects [duplicate]

I collected data along two perpendicular transects (in a "+" shape) and would like to create a prediction surface map with kriging. What form of kriging (method, parameters, etc.) is appropriate to ...
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Unitary test for anisotropic ordinary kriging

I am reading the book from Isaaks and Srivastava "An Introduction to Applied Geostatistics" and I am coding a small library in Python to perform kriging. I know there are other tools but I wanted to ...
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Multi-Geodatabase Iteration and Kriging

I have a huge number of databases in a single folder that have point data with z-values. I need to go through and pull out the point features from each geodatabase and create DEMs for each. Through ...
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Using ArcGIS Desktop to calculate reduction in kriging prediction errors?

I am trying to "optimise" my groundwater monitoring network using the variance reduction method. For this approach, I have a kriging model and wish to explore the change in the average standard error ...
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69 views

Converting distance from km to degrees (WGS84)?

Is there an equation in which I can convert distance in kilometers into degrees? I am performing a Kriging analysis and when I am measuring the distance between the input points (for LAG and Major ...
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What are the formulas used in SAGA Ordinary Kriging?

can some one name the formulas avaible in the Ordinary Kriging Modul of SAGA: What ist the exponential, spherical, Gaussian-Model, etc.?
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250 views

R kriging raster returns NA for some prediction points?

I am trying to interpolate a raster layer of chlorophyll-a data using kriging (gstat::krige) in R, however the resulting interpolation is showing NA values in a peculiar straight line through the ...
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Cokriging cross validation variances too small?

I'm looking into kriging the Meuse dataset in R. I first performed ordinary kriging using copper, using krige.cv to calculate residuals. The distribution of prediction variances given by applying ...
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98 views

After I give kring command, this error comes up: data item in gstat object and newdata have different coordinate reference systems

> library(gstat) > library(readxl) > library(sp) > library(rgdal) #2013(FATALITIES) data <- read.csv("C:/Users/sbs/Desktop/Study/RA/Accident analysis/New folder/Iowa total crashes ...
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34 views

Estimation value of simple kriging are constant in geostatistical analyst (ArcGIS)

The objective of my study is to compare the accuracy of the model SK (simple kriging) and OK (ordinary kriging). When I use OK to apply on my data, there is a little bit variation on the prediction ...
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Cross validating part of spatial interpolation?

I am very new to ArcGIS Desktop . I am exploring some of the spatial interpolation techniques like IDW and Kriging. My query is on the cross validation part of the techniques. In the cross validation ...
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Using convex hull for interpolation of individual plots or lump plots together in ArcMap?

This question is inspired by Using kriging to extrapolate values outside of sampling polygon in ArcMap? I'm working on a project trying to understand the lasting effects of historic scientific ...
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Strange output of Kriging standard deviation

For my thesis I am interpolating some 4000 boreholepoints via Kriging to try and visualize a geological layer under the ground level. Since I know there is a strong trend in my data (SW-NE slope) I ...
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Making data table using linear kriging interpolation with variogram in R

I have a table of data with such structure: longitude_for_data = c(32,68,89,145,176, -14, -42) latitude_for_data = c(22,98,21,13 , 16,-134,-102) Z_for_data = c(30,40,60,70 , 20, 40, 100)...
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1answer
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Does the sampling design affect the variogram and mapping? [closed]

I am not sure if this is the right place to ask the question, but I don't know where to ask. So please excuse me if not so. I am considering two sampling strategies, the first is locating samples on ...
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278 views

QGIS 3.6 ordinary kriging produce one constant output

When I run kriging a+bx or any other model, I always get just one constant output. I have selected collect attribute. Prediction and quality layer has just one value. see output here:
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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
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Kriging with variable spatial precision?

I have a data-set comprised of hydraulic conductivity estimates measured at groundwater monitoring wells, as seen here: Exact GPS coordinates are available for some wells, while for others I only ...
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109 views

Error in Universal Kriging using gstat package in R [closed]

I am trying to perform universal kriging in R using the gstat package and running into the following error: krige(formula = CDD_LT_stC ~ Imperv1km + Elev_new, locations = sp.cal_data, newdata = sp....
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279 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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1answer
290 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
163 views

Which is the model semivariogram for binary data?

I have a binary data (1,0) to calculate spatial distribution of soil bacteria. I have to use indicator kriging (presence/absence) and fitting model of semivariogram. Then, which is the model ...
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1answer
58 views

Kriging for unevenly spaced points using R?

I started to read about Kriging and the implementation into R. In all the tutorials I found, a (regular) grid is used to do ordinary or universal kriging. My situation is as follows, I try to ...
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1answer
185 views

IDW/Kriging running slow in R

I have a dataset with 2157335 entries, and I am performing IDW/Kriging to interpolate. But the code is running very slow. I am not sure this is because of a large dataset or there is something wrong ...
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186 views

SAGA GIS Kriging in QGIS calculating wrong values

I have a point shapefile concerning rainfall for the whole country. The points represent the annual rainfall in mm and range from 675-3562. I have approximately 800 points. I am attempting to use ...
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213 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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Cokriging: zero distance cross-semivariance in undersampled cases [gstat error]

Trying to cokrige two variables that are not perfectly colocated (one has sparser measurements than the other), I faced an issue that I'll illustrate with the following MRE. With the meuse dataset, ...
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200 views

Calculating coefficient of variation from gstat output to create uncertainty map in R

I was asked by my supervisor to create uncertainty maps of kriging interpolation based on the coefficient of variation ((sd/mean)*100%). I used krige function from gstat package to perform the ...
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193 views

Interpolate Multiple Data With Kriging In ModelBuilder?

I am having problems building a model for running interpolation on multiple data using the Kriging method. I have followed these steps: Convert multiple data to geodatabase file Used iteration on ...
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Kriging example with sf object

I am new to geo spacial analysis. I would like to learn kriging from a simple example. Say, we have four points with some z value. library(sf) library(gstat) library(tidyverse) dt<-tibble::...
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269 views

Empirical variogram plot in QGIS

I am trying to do kriging on mortality rates using QGIS (I have version 3.0 but I downloaded the 2.18.20 to be able to follow the web documentation and most of the answers here). From what I have ...

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