Questions tagged [geostatistical-analyst]
Geostatistical Analyst is an ArcGIS Desktop extension, that provides a suite of tools for spatial data exploration and surface generation.
75
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1answer
30 views
Extracting time series trend analysis parameters from kriging using ArcGIS (versus R)
A grad student has asked me a question about extracting trend parameters for a time series of data using ordinary kriging ArcGIS tools. I'm not an expert in the spatial statistics options of ArcGIS, ...
-1
votes
1answer
72 views
How maxent's algorithm uses data to predicte distribution of species
Using the same list of occurrences with present and future bioclimatic variables (worldclim) I get two obviously different distributions. In the case of the future projection, I assume that the ...
4
votes
0answers
65 views
How does Empirical Bayesian Kriging of ArcGIS Pro handle sampling bias?
In ArcGIS Pro, simple kriging approaches allow you to de-cluster your data before applying a normal-score transformation. According to the Esri guideline, normal-score transformations are only ...
1
vote
1answer
22 views
Setting extent of Geostatistical Layer for further Export to Grid using ArcPy
I am writing a script to create JPEG interpolational maps using Geostatistical layer (calculated on RadialBasisFunctions).
I have a point-feature file which I use to create this GA Layer. There's a ...
0
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0answers
33 views
ArcGIS Extract Values to Table crashes
I am running the Extract Values to Table tool from the Geostatistical Analysis Toolbox in ArcGIS Desktop 10.6.1 on Windows 10.
My inputs are a polygon layer with ~70.000 polygons and a raster layer ...
1
vote
1answer
43 views
Iterating through table for IDW says parameters are not valid?
I have a table with precipitation data from 5 weather stations and I am trying to iterate through the table to perform IDW on each field (month of precipitation).
import arcpy
from arcpy import env
...
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0answers
20 views
Other way to see average standard error in cross validation between model for geostatistical layer?
Is there another way to compare average standard error in geostatistical wizard between model type? It seem not relevant to generate one by one the geostatistical layer to compare each model type just ...
1
vote
1answer
48 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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0answers
71 views
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 ...
0
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0answers
19 views
Value changes while converting Geostatistical layer to grid using ArcGIS Geostatistical Analyst?
I'm trying to export the GA layer (krigging interpolated temperature data) to raster. While converting, the data range is getting changed in the resultant raster (max and min) as indicated in the ...
2
votes
2answers
562 views
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)...
2
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158 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....
0
votes
1answer
245 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 ...
3
votes
1answer
262 views
What is a relevant geospatial modelling approach when no spatial autocorrelation is found?
Although I have found on StackOverflow all answers I ever had on GIS matters using R, ArcGIS and QGIS in the past, I am currently faced with one question I can't find an answer to online.
For my ...
1
vote
1answer
39 views
geostatistics across different projections?
What are some best practices for calculating local geostatistics across the boundaries of different projections?
I am thinking of using the State Plane Coordinate System to represent a national-...
2
votes
2answers
284 views
Kernel Interpolation with Barrier
I am trying to use the 'kernel interpolation with barriers' tool in the Geostatistical Analyst toolbox of ArcGIS 10.3. My data consists of 600 marine animal relocations, and I am trying to calculate ...
3
votes
1answer
640 views
kriging vs cokriging
I am attempting to interpolate sediments across an area with data from 3 sources using ArcGIS 10.3.
All three sources divide sediments into percentages of mud, sand or gravel.
Two sources come ...
0
votes
1answer
248 views
Surface analysis with R - Shape recognition
I am trying to analyse a geological surface with R & Python and I would like to know if there are some ways to distinguish, divide and quantify repetitive structures such as advertised by a ...
2
votes
0answers
62 views
How to create a surface area that interpolates and visualizes trends in physical activity in ArcGIS?
I have a dataset that contains several hundred telemetry points for my focal species around twilight hours. Attached to these points are mean values that represent how active the animal was 10 ...
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vote
0answers
64 views
Rule of Thumb for setting smoothing parameter
I'm trying to model some binary data (disease infections) using indicator kriging in the Geostatistical Wizard in Arc 10.3. For presentation purposes I'm using the smoothing option. Is there a rule of ...
1
vote
0answers
158 views
How to test for correlation between two point data sets
I want to determine if there is a correlation between weed plant species density and habitation (buildings).
Both data sets are points. The weed species has an 'abundance value' (i.e., one point may ...
0
votes
1answer
1k views
Geostatistical Analyst toolbar options not accessible
I am trying to perform cross-validation for a Kriging interpolation I did on my dataset. For this I wanted to use the Geostatistical Analyst Wizard in ArcGIS Desktop.
I have the Geostatistical ...
1
vote
0answers
239 views
Converting raster into geostatistical layer? [closed]
I have downloaded a raster surface (SRTM) with pixel size equals to 30*30, and I want to use that surface as a geostatistical layer for further analysis. Is there any available tool that converts ...
2
votes
2answers
378 views
What does 'Weight Field' in IDW interpolation mean?
I am trying to figure out how the Weight Field option of Geostatistical Analyst IDW in ArcMap 10.3 works.
On IDW - ArcGIS Desktop Help I can find just this simple explanation:
Used to emphasize ...
1
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0answers
64 views
Cross-validation error threshold in ArcGIS
I'm learning the Geostatistical Wizard toolset in ArcMap 10.4.1 and I am performing the cross-validation step in an IDW interpolation.
I have done some research regarding the process of cross-...
0
votes
2answers
4k views
Create groundwater contours in ArcGIS
I'm trying to determine a way to accurately produce groundwater contours in ArcGIS. The industry standard is using Surfer to construct the contours from monitoring well data. I would imagine ArcGIS ...
1
vote
1answer
188 views
Kriging predictions for presence only data with Maxent
I was doing some geostatistical analysis (variogram+kriging) for a "presence only" type data in a species distribution modeling context. Since, we know that when estimating the (empirical) variogram, ...
1
vote
1answer
150 views
Areal Interpolation - Error 40066 - cannot distinguish between polygons
I have data for some countries but not for others and would like to predict the missing values from neighboring countries weighted by their area, distance etc.
To do so, I am using the geostatistical ...
2
votes
1answer
97 views
Creating subset for doing Co-Kriging interpolation and Crossvalidation?
I have a data set with only 47 soundings, so a small amount of data available. With this information I am trying to produce a raster surface through interpolation. Unfortunately, a data analysis ...
1
vote
0answers
214 views
Land cover generation
I am working on a river watershed on QGIS and I need a land cover map.
I have a good raster of land use data with 15 m resolution for year 2015, but it covers around the 90 % of the basin.
I have ...
2
votes
0answers
97 views
Sample Design for Kriging [closed]
I am taking soil samples on an agricultural plot and will be using the results as input to create a semivariogram for kriging in ArcGIS. This plot features raised planting beds in which the test crop ...
1
vote
0answers
260 views
Understanding semivariogram model in ArcGIS; difference between Binned points and Average points?
I am sorry if I am unaware of some very basic ideas of semivariogram. I am trying to understand the difference between binned points and averaged points. In this [document] (http://desktop.arcgis.com/...
3
votes
1answer
585 views
Ordinary kriging problem after exporting to raster (Geostatistical Wizard)
I'm not sure what I'm making wrong. I used the Geostatistical Wizard to perform an ordinary kriging. The resulting Geostatistical Layer looks like this:
After using the GA Layer To Grid Tool by right ...
2
votes
0answers
75 views
Analysis method for Vegetation category change [closed]
I have a data set showing vegetation change over a 100 year period. The data is categorical (ie. Conifer, Deciduous, Mixedwood, Grassland, Shrub, Open Canopy forest, non vegetated). Each cell in my ...
2
votes
2answers
302 views
Getting similar IDW results using Spatial and Geostatistical Analysts for spatial interpolation of data with many zeros?
My data are plant biomass data from hundreds of sites. Most sites have zero biomass; these zeros are real. Thus, my data violate most assumptions of geostatistical interpolation methods (confirmed ...
3
votes
1answer
4k views
Doing spatial correlation between two layers on ArcGIS?
I have two datasets and I'm trying to determine the extent of their spatial relationship. I suspect they are closely related but I would like to produce a map output to illustrate this relationship.
...
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0answers
616 views
Calculate spatial GINI coefficient for land use
I am interested in calculating an index of agricultural land inequality for Brazil. I'm thinking that a GINI coefficient would be a good approach given traditional uses of GINI. I have a data set for ...
5
votes
1answer
186 views
Understanding ArcGIS Geostatistical kriging?
We use soil samples data for interpolating soil fertility parameters using ArcGIS geostatistical Kriging. While doing kriging, the resultant map values ranges are not matching with our input samples ...
2
votes
1answer
2k views
Difference between Spline (spatial analyst) and Geostatistical Analyst? [closed]
Why the interpolation result of Spline with Tension in the Spatial Analyst is different from the that in the Geostatistical Analyst (both in ArcGIS 10), including their minimum values, maximum values, ...
4
votes
1answer
595 views
Does IDW interpolation in ArcGIS Geostatistical analyst work as exact interpolation method?
As we know, Inverse distance weighted (IDW) is an exact interpolation method, which means the interpolated values of the known samples should be the same with its original observed values. But when I ...
2
votes
1answer
361 views
ArcGIS method for declustering a spatial dataset?
I have previously asked this question but perhaps was using the wrong terminology. I would like to run some type of cell declustering on a spatial dataset. Is there a tool for doing this in Arc? ...
1
vote
1answer
136 views
arcpy.SubsetFeatures_ga output not saving in correct feature dataset
I am using SubsetFeatures_ga to create a random dataset within a file geodatabase and am trying to save the output feature class in a feature dataset but it keeps getting saved in the root of the file ...
1
vote
1answer
1k views
Example of simple kriging with varying local means in R
I'm looking for an example of how to use simple kriging with varying local means in R.
I've tried google, a few books (for example Aplied Spatial Data Analysis with R) and I've found almost nothing. ...
1
vote
1answer
51 views
How to create dynamic point_coord variables for Neighborhood Selection?
I'd like to us the arcpy.GANeighborhoodSelection_ga in a loop where the point coords would come from a different source. What I tried already:
If I define the coords, it works:
pointcoord = "689383....
2
votes
2answers
768 views
Indicator Kriging and cokriging using ArcGIS Geostatistical Wizard?
I have a map of vegetation in 1913 for a particular landscape (approx 35,000ha), of which I have data for just short of 60% of the landscape. The limited visibility is due to the coverage being ...
3
votes
1answer
212 views
Cokriging using categorical covariables in ArcMap?
I am using cokriging to model a continuous variable across my study unit (soil carbon). I have one continuous covariable (soil moisture) but also a categorical covariable (vegetation community). I am ...
0
votes
1answer
54 views
Need to develop a model for measuring inter-annual and seasonal variability in pasture cover using modis 16 day composites
Aiming to use statistical methods in ArcGis and Envi image analysis to measure inter-annual and seasonal variability in paster cover using MODIS 16 day composite image from 2000-2014.
Quite stuck on ...
5
votes
1answer
101 views
Preparing data for semiovariogram analysis in ArcGIS with large sample sizes?
I am working on a statewide project to create surface water quality grids from point samples. In some instances, we have large sample sizes (n>50,000) which is problematic when creating ...
2
votes
0answers
270 views
kriging of compositional data (grain size)
I have posted this already in the GEONet Forum but without any suggestions, now I am hoping for some feedback here:
I have a problem concerning interpolation of compositional data of grain sizes. I ...
6
votes
1answer
1k views
Dealing with data which are not normally distributed when kriging?
I'm a novice with advanced spatial interpolation, and I'm trying to use the Geostatistical Analyst to interpolate a surface based on borehole data, using Ordinary Kriging.
The help file explains how ...
