Questions tagged [geostatistical-analyst]

Geostatistical Analyst is an ArcGIS for desktop extension, that provides a suite of tools for spatial data exploration and surface generation.

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11 views

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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1answer
23 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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15 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 ...
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16 views

Masking GeoStatistical Analyst layer without reducing quality?

I am currently working to produce a prediction surface map using geostatistical layer. The problem is I cannot mask the geostatistical layer directly. So, I need to convert to raster in order to use ...
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1answer
22 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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1answer
103 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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14 views

Simulating random field with power law distribution using ArcGIS Desktop?

As far as I know, there are a lot of methods developed for simulating 2D random field with Gaussian distribution, such as geostatistical method, Fourier transform, etc. But a lot of geoscientific ...
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18 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 ...
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2answers
345 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)...
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8 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 ...
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9k views

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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2answers
222 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 ...
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81 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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1answer
150 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 ...
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2answers
3k 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 ...
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0answers
247 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 ...
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1answer
200 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 ...
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1answer
35 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-...
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578 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 ...
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1answer
89 views

Improving Geostatistical Analyst Wizard performance?

I have performed CoKriging using Geostatistical Analyst in ArcGIS 10. When I tried to export the prediction to raster, the process became so slow. Is there a way to make the exporting faster?
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60 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-...
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1answer
353 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 ...
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1answer
86 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 ...
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3answers
782 views

Finding the average value from polygon areas in a fishnet cell

I am looking to assign depth values to each fishnet grid cell that I have by taking the area-weighted average of values from a contour/isopach map. The map was interpolating using the depths of ...
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1answer
167 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 ...
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0answers
60 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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50 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 ...
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120 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 ...
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1answer
717 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 ...
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1answer
158 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 ...
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136 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 ...
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1answer
158 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, ...
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1answer
1k views

Classical or robust variogram for incorporation into generalized linear model

I'm modeling counts of organisms over time at eleven locations. I'd like to account for temporal autocorrelation in the counts, assuming it's present. As the data are not equally spaced in time, I'...
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1answer
52 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 ...
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1answer
128 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 ...
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1answer
1k 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, ...
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1answer
170 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 ...
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1answer
937 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 ...
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1answer
433 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 ...
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1answer
643 views

Applying mask in ArcGIS Geostatistical IDW?

I'm finishing an analysis of approximately 850 archaeological assemblages in the Mediterranean, and I've successfully run IDW in Geostatistical toolbox (ArcGIS 10) to generate the results I like. I'm ...
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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 ...
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0answers
212 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 ...
5
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1answer
97 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 ...
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0answers
235 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/...
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0answers
74 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
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2answers
269 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 ...
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1answer
3k 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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3answers
1k views

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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1answer
532 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 ...
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1answer
176 views

Set a theoretical (not empirical) variogram in ArcGIS Geostatistical Analyst

I'm trying to do some Unconditional Gaussian Simulations using the Gaussian Geostatistical Simulation tool (see here). However, I don't have any data that I am doing this from - just a theoretical ...