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.
36 questions
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Performing Ordinary Kriging in SAGA via QGIS SEXTANTE Plug-in?
I'm trying to learn how to apply the kriging analysis in QGIS using the SEXTANTE plug-in and SAGA tools. It appears that I have my SEXTANTE and SAGA folders configured properly according to the user ...
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9
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Open source methods for kriging?
I have a point dataset which I'd like to Krige, ideally using an open-source software package. If possible, I'd also like to choose the semi-variogram model during the process to improve the ...
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Installing SDA4PP plugin for Kriging in QGIS
I am trying to do kriging in QGIS. I have loaded the SDA4PP plug in.
Almost all of the items in the SDA4PP dropdown menu are not highlighted and are unresponsive when clicked on - including the ...
- 123
8
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1
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Plotting map resulted from kriging in R
I want to plot a map weighted by prices. I got a data frame of latitudes, longitudes and prices:
> str(data)
'data.frame': 1253 obs. of 3 variables:
$ lon : num 11.2 11.1 11 11 11.3 ...
$ ...
4
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2
answers
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How to achieve parallel Kriging in R to speed up the process?
I have tried the gstat package in R to perform bathymetry predictions based on Kriging interpolation methods. However, the process is very time consuming due the large amount of sampling data I'm ...
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2
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Choosing IDW vs Kriging Interpolation for DEM creation?
I'm trying to create a DEM using point data spaced very regularly about 10m apart. The area I am interpolating is an educational facility with many flat parking lots and football fields but still has ...
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2
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Minimum number of samples for kriging interpolation
I get some data with number of specimens with a request to interpolate it using kriging method.
After some investigation it appeared that kriging results (performed in ArcGIS Geostatistical Analyst ...
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3
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Converting point data into gridded dataframe for histogram analysis using R?
I am very new at using GIS data and only modestly experienced with R. I've been reading about how to analyze spatial data using the spatial-analyst.net PDF book, so I'm not completely lost, but I ...
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2
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R gstat krige() - Covariance matrix singular at location [5.88,47.4,0]: skipping
When I want to perform the kriging it only works sometimes, depending on what values I use in my datatable. As a result of the krige function I get for var1.pred: NA NA NA ... and var1.var: NA NA NA .....
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Kriging method to use for rainfall?
I am working on an rainfall analysis and I have to interpolate some datas with kriging method.
Is co-kriging suitable for the rainfall analysis?
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Method for estimating accuracy in spatial interpolation?
When using a spatial interpolation method (any method) without having a way to validate it, besides sampling some points out, is there a way to count as well with the mean distance between ...
- 2,546
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Cross-validation of TPS and kriging outputs from the fields package in R
I am looking for existing package or functions that will allow me to cross-validate multiple outputs of Thin plate spline (TPS) and Kriging from the fields package.
Does anyone know of any available ...
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1
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Variogram model - SAGA on QGIS Processing
QGIS 2.14 (Win) comes with SAGA 2.12, which Ordinary Kriging supports 6 variogram model options.
However, if I run SAGA Ordinary Kriging from QGIS Processing Toolbox, there is no drop down menu. Only ...
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4
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2
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Kriging values greater than the most extreme value of the input layer?
I'll admit I don't understand kriging to the fullest. Yet, I've read that the weights should add up to 1 as in IDW and Natural Neighbors.
However, surrounding the biggest elevation points of my ...
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1
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Error in In predict.gstat in R
I am trying to do kriging by gstat package through R.
Here is my Code:
krg<-krige(var ~ 1,data,grid,model=vgm,nmax=30)
But each time I recive this warning:
1: In predict.gstat(g, newdata = ...
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3
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1
answer
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Integrating DEM within kriging and other interpolation methods?
I would like to see the difference of including DEM in interpolation from without. Some studies on climate data interpolation suggest that interpolation performs better with DEM. How do I do this in ...
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3
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Is kriging an exact interpolation method?
Can kriging be an exact* method? For example, when optimized with the Geostatistical Wizard? Or in any other way? (as far as I know, "normal" kriging isn't an exact method).
*exact: predictions at ...
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2
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Only Interpolating within a polygon feature in ArcMap 10.1
I have sample points within a single polygon feature class that I would like to interpolate, likely using kriging. The problem is the sample points and polygon boundaries are many miles apart and ...
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1
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1
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Exporting kriging prediction map in .asc format?
I would like to save the information generated from an ordinary kriging (processed with the function autoKrige from the automap R package), into a file extension readable in ArcGis for desktop 9.3.1 (...
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1
vote
2
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Using ArcGIS API interpolation functions (idw, kriging, splines) in my own dataset?
Does ArcGIS API provide interpolation functions, like if I want to interpolate from my own set of values?
I know that ArcGIS provides functions for interpolation like IDW, Spline and Kriging etc, ...
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3
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Kriging with barriers in ArcGIS Desktop?
I am trying to do interpolation in a coastal area with data points in several rivers emptying into a bay and on opposite sides of peninsulas.
I have created a coastline layer to use it as a barrier ...
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8
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3
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Backtransformation of kriging predictions and variances
I'm not sure how to back-transform log-normal kriged results. This example using the "meuse" data shows how to make variogram and use it to get kriging predictions (and variances) using the popular '...
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How to calculate kriging weights?
In Esri's documentation on how to make a prediction in Kriging, I couldn't figure out the linkage between the semivariograms and the prediction process from reading the description therein:
After ...
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7
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2
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Performing Kriging in QGIS
Does anyone know how to perform kriging in QGIS? and not via SAGA but actually in the program itself.
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1
answer
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How do I implement 'weighted' kriging in R? [closed]
I'm trying to interpolate the values of an attribute (called "disease_rate") that i've sampled at a set of spatial points and i'd like to add 'weights' to the resulting kriging estimates.
Basically, ...
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0
answers
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Dealing with duplicate locations when kriging by replacing them with single location taking mean of duplicates using R [duplicate]
I understand that the existence of duplicate points (locations) when Kriging will result in a singular covariance matrix. The only way I've encountered people dealing with this is to keep the first of ...
- 173
5
votes
1
answer
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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 ...
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votes
1
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Keeping unchanged observed values after kriging interpolation
Is there a way to force kriging to keep unchanged measured values of observation points?
For example: if the observed value of a location is 1, after the interpolation it could be 0.9 or even 0.5, ...
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4
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2
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Using kriging to extrapolate values outside of sampling polygon in ArcMap?
I have data points with values along 4 perpendicular transects. The kriging tool that I am currently using interpolates within the polygon created by the 4 transects, essentially a rectangle. I am ...
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2
votes
1
answer
1k
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Getting range value from exponential variogram model
I am using vgm() from the gstat library in R:
variogr <-vgm(sill,"Exp",range=range,nugget=0)
output <-krige(...,model=variogr)
As you can see I'm using fixed psill and range values.
Before ...
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2
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1
answer
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Interpolation of categorical data from a polygon surface with gaps
I have built a vegetation map from a set of historical photographs from 1912. The photographs were taken from the ground (ridges and peaks of mountains), and I have developed a method of ...
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vote
1
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Using kriging with data in GDB
I have series of data in my GDB
I am running the program under VBA and what I want to do is using the data by the tool Kriging.
This is what I thought:
First, Kriging needs data that must be a ...
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1
vote
2
answers
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Kriging using multiple spatial input variables and one spatial output (response) variable
I have a data table with the following columns in a CSV file.
X Y Zinc L F C
--- --- ----- -- --- ----
Of course, I can import the CSV file as a data frame
a <- ...
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1
answer
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Fit Variogram Iteration Warning
I would like to perform kriging using a variable call "Secchi.Disk" from a data set I have. However, when fitting the variogram I get the following warming message
Warning message:
In fit.variogram(v,...
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1
answer
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Creating SpatialPolygons in R
I am trying to do kriging with my data. But there is a problem here. I want to use krige command in gstat package. But I do not have "Spatial object with prediction/simulation locations".
How I can ...
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0
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1
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0........0.kriging error messages, grid file problem ? (automap, gstat)
I am trying to conduct kriging of variable called percent in South Africa.
head(LL12)
Location Longitude Latitude percent
1 L1 16.48476 -28.60737 1.0000000
2 L3 16....
