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2
votes
1answer
19 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. ...
1
vote
0answers
15 views

How to 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 ...
3
votes
1answer
100 views

Difference between Spline (spatial analyst) and Geostatistical Analyst?

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, ...
3
votes
1answer
57 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 ...
1
vote
1answer
65 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
22 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
96 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
31 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 = ...
2
votes
2answers
145 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 ...
0
votes
0answers
21 views

Weird interpolation “bug” - Arc Geostatistical kriging, lower bound > upper bound [duplicate]

I'm using the wizard in Geostatistical Analyst, ArcMap (10.0 I think) in order to run some simple kriging. Output is set to Prediction. I have two separate inputs, which have points at the exact same ...
0
votes
0answers
80 views

Pythonw has stopped working when running arcpy.SubsetFeatures_ga

I'm currently trying to subset a shapefile into training and validation files. When I run the following line of code, python crashes. I'm using ArcGIS 10.1. arcpy.SubsetFeatures_ga(current_shapefile, ...
0
votes
1answer
217 views

in R : get a SpatialPolygonDataFrame from gIntersection{rgeos] with sub-area as attribute?

I am using gIntersection (package rgeos) to intersect a polygon shapefile containing 20 buffers zones, with another polygon shapefile containing "ground occupation mode (GOM)" (an area divided in ...
3
votes
0answers
52 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
0answers
40 views

Semivariogram modeling in Arc Gis Geostatistical anaalyst

I want to know that what units of distance for lag size is used in geostatistical analyst 9.3.1 Arc Map. I am not getting the same from software. Please reply, if anyone knows about it.
0
votes
1answer
31 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 ...
4
votes
0answers
44 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 ...
3
votes
0answers
223 views

How to deal 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 ...
0
votes
1answer
106 views

Problems applying a mask in 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 ...
2
votes
3answers
245 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 ...
1
vote
0answers
276 views

Creating landslide susceptibility map using logistic regression and ArcGIS Desktop? [closed]

My project is to build a landslide susceptibility map using logistics regression. I have generated the following maps so far: slope map, hill shade, curvature, elevation, road buffers, river buffers ...
1
vote
2answers
441 views

Geostatistical Analyst raster export looks completely different

I'm having trouble trying to re-create how a Kriged layer looks when interpolated using Geostatistical Analyst. I like the level of generalization (smoothness) of the filled contours in the ...
2
votes
1answer
226 views

Cross-validation and optimal p power in IDW

I use the "Geostatistical Wizard" in ArcMap 10 to do my interpolations. For example, when I do IDW and I want to decide for the optimal p power or the optimal number of neighbors that will contribute ...
1
vote
0answers
32 views

Prediction of coastal change [closed]

I have vector data in coastal change for two separate years, like 1950 and 2000. I want to use GIS to create a "Prediction of coastal change" in 50 years, 2050. How do I figure out what is the shape ...
5
votes
1answer
390 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, ...
0
votes
2answers
169 views

Why do the range of values change when I export geostatistical layer to raster?

I did an interpolation of soil pH using 232 data points in geostatistical analyst with IDW, RBF and ordinary kriging. For all 3 methods, the range of pH values change (become smaller) after I export ...
1
vote
1answer
46 views

Geostatistical Analyst Wizard

I have performed cokriging using Geostatistical Analyst in ArcGIS 10. When I tried to export the prediction to raster, the process became so slow. Have you experienced this? Is there a way to make the ...
1
vote
0answers
20 views

Verifying time-invariance for spatial gradients of air pollution?

I have data from a network of NO2 passive samplers. Measurement are repeated in the same positions in different years. I need to verify if spatial gradients in air pollution remain constant in time, ...
1
vote
1answer
101 views

Wind turbine placement optimization and loss on surrounding house value

I am doing a geostatistical placement optimization study on where would be the optimal placement of a wind turbine in a Danish region. One of the variables taken into account is the cost on the value ...
1
vote
1answer
102 views

How to show GeoStatistical Analyst Layer in web map using ArcGIS Javascript API?

I have created a "GeoStatistical Analyst Layer" with "Diffusion Interpolation with Barriers" tool and then I published it on the ArcGIS for Server. How can I show this layer in my web map application ...
2
votes
0answers
55 views

Is there any statistical method to proof if the method is suitable or not [closed]

I have recently done a phenological study using threshold method from MODIS NDVI images. But I'm suffered that I don't have any situ observation (ground truth) data to do validation. Is there any ...
3
votes
0answers
32 views

Finding closest anticorrelated polygon or automate what is learned in semivariogram?

I am trying to do spatial autocorrelation of sorts based on a layer of polygons of mean rainfall data. I want to see how rainfall deviates from a certain point on the landscape. Essentially, I want to ...
1
vote
1answer
124 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 ...
2
votes
1answer
93 views

Examining the covariance between biodiversity and other variables

I have som problems with an analysis and would be very grateful for any answers or suggestion. The background is: - I want to examine the covariance between ecosystem services in an area. I don´t ...
2
votes
1answer
270 views

ARCGIS10: updatelayer results in error - LayerObject: Get attribute renderer does not exist

I'm quite new in using python in Arcgis 10. I wanted to use the symbology of a geostatistical layer in the TOC in another geostatistical layer in the TOC. Therefore, one should use ...
1
vote
1answer
437 views

Diffusion/Kernel Interpolation with barriers? [closed]

I need to interpolate water quality data in a rather small area with peninsulas, islands and developed coastline that will act as barriers between my testing/sampling points. I understand I have to ...
0
votes
0answers
134 views

How to spatialy interpolate forest tree height, basal area data for certain species

I have ecological sample data collected from 5 locations within a 133345678.5678 sq meter area. The data is stored in a point shape file. I have joined tabular data with the point layer by duplicating ...
1
vote
1answer
315 views

IDW: Default Maximum Distance and Coincident Points

The ArcGIS Help file says the Default Maximum Distance, when using the Variable Search Radius in IDW, is the extent's diagonal, however, no value is automatically filled in the corresponding box after ...
14
votes
2answers
4k 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 ...
0
votes
2answers
2k views

Difference between Geostatistical Analyst and Spatial Analyst toolboxes for interpolation?

I did interpolation on point data using "Geostatistical Analyst" tool. It gives me surface layer. Then I exported this layer into raster image (by right click on this layer=>export data into raster) ...
3
votes
0answers
135 views

Which geostatistical tools to use to determine surface changes over 40 years?

I have a data from the Weather station with SWEmax (snow water equivalent) collected over 40 years. I need to interpolate the data over my river's watershed and then, somehow, determine the ...
4
votes
1answer
542 views

Statistical analyses for survey against raster?

I am somewhat of a newbie to geostatistical analyses, but pretty familiar with GIS and remote sensing packages. I was wondering if anyone had suggestions on appropriate geostatistical analyses for a ...
6
votes
1answer
992 views

Explaining different Standard Deviation results from same data in ArcGIS Desktop and MS Excel?

I have done some interpolation in Geostatistical Analyst in ArcGIS and I got the Standard Deviation (SD) a bit different from the SD that I calculated in Excel Spreadsheet. What algorithm does each ...
4
votes
1answer
385 views

Regression with Nominal and Categorical Data

I am doing a project looking at the prevalence of a weeds in an area. As an example, I have the following layers: Weeds Layer (polygons) {categorical data} Each polygon represents a point or polygon ...
1
vote
1answer
963 views

How to convert Geostatistical analyst (GA) file to Raster FAST?

I have been trying to convert a number of Geostatistical analyst files that i were created using Geostatistical wizard in ArcGIS 10. I want to save these files as Raster and use the File Am i ...