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Product List > ArcInfo Desktop > Geostatistical Analyst

• How can one determine the lag size to use in Geostatistical Analyst?
  There are no set rules for determining what lag size should be used. It is the craft of the researcher, their knowledge of the phenomenon they are analyzing, and the reason(s) for modeling a variogra...
• Geostatistical Analyst tutorial data does not line up with other data
  When trying to use other datasets with the Geostatistical Analyst tutorial data, the datasets do not line up properly.
• Why does the Geostatistical Analyst variogram/covariance cloud diagram use a maximum of 300 pairs of samples?
  A semivariogram, covariance, or cross-covariance cloud depicts all possible pairs of points for a range of lag distances. The default dataset of 300 points totals nearly 45,000 point pairs, and even ...
• What is the most commonly used Kriging algorithm?
  Ordinary kriging. This method produces interpolation values by relying on an unknown mean value, allowing local influences due to nearby neighboring values. When the mean is unknown, there are few as...
• What types of Kriging methods are used in Geostatistical Analyst?
  The six types of Kriging methods used in Geostatistical Analyst are: Ordinary Simple Universal Indicator Probability Disjunctive
• Is additional software required to estimate optimal parameters for the prediction models implemented in Geostatistical Analyst?
  No. Geostatistical Analyst provides all of the necessary tools for data exploration, variographical analysis, detrending, declustering, and model validation.
• Can Geostatistical Analyst perform block kriging?
  Yes. Block interpolation is available for all interpolation methods, including deterministic, when the results of prediction are exported to a raster format. The grid option in the symbology tab of t...
• Does the Geostatistical Analyst support barriers?
  No. The current version of the Geostatistical Analyst does not support barriers or breaks in the semivariogram or covariance. Barriers can be used with the Spatial Analyst Extension using the Invers...
• Does data selection influence prediction?
  Yes. The Geostatistical Wizard will only use the selected subset of input data to create a new surface. For kriging, the software requires a minimum of 10 data points to create a surface.
• Is it true that good estimation of semivariogram requires at least 30 pairs of points per lag?
  No. However, at least 30 pairs of points per lag is optimal.
• When should a semivariogram type other than spherical be used?
  The semivariogram model used in Geostatistical Analyst depends on the properties of the data. The spherical semivariogram is used by default because it is the most popular in both geostatistical lite...
• Why is it possible to use the cross-covariance and not the cross-semivariogram between primary and secondary data?
  Unlike cross-covariance, the cross-semivariogram can only be used for coincidental data locations. Additionally, the cross-semivariogram is limited because it cannot be used to estimate the shift bet...
• Is kriging an exact interpolator?
  The kriging interpolation method is usually associated with exact interpolation. When semivariogram and covariance models have a nugget effect there is potential for a discontinuity in the predicted ...
• What are the interpreted predictions that create a Quantile map?
  The output associated with a 0.5 quantile map corresponds to the median estimation of the value at each unsampled location. The 0.75 quantile represents values that are overestimated and correspond a...
• How does the search neighborhood influence a Geostatistical prediction?
  The value at an unknown location is predicted using only those data points located within the search neighborhood when it has been defined. Point locations are only assumed for those points within th...
• How many cutoffs can be used in Indicator Kriging?
  Geostatistical Analyst limits the total number of variables and cutoffs to four. When using Indicator kriging on a single variable, three additional cutoffs can be used. Probability kriging requires ...
• Does Geostatistical Analyst work with all ArcGIS licences?
  Yes. Geostatistical Analyst is an extension for the ArcView, ArcEditor and ArcInfo Desktop products. It does not work outside of the ArcGIS Desktop software environment.
• Does Geostatistical Analyst include interpolation techniques that use splines?
  Yes. Splines are included in the list of kernels for the deterministic Radial Basis Functions interpolator.
• Can Geostatistical Analyst detect errors in data?
  Yes. Exploratory Spatial Data Analysis (ESDA) tools can be used to detect both global and local outliers. Tools are also embedded into the Geostatistical Wizards to identify erroneous data; for examp...
• Install extensions to ArcGIS Desktop
  Instructions provided describe how to install the extensions for ArcGIS Desktop. Below are the items needed prior to install: ...
• Why are the options on the 3D and/or Spatial Analyst toolbars greyed out?
  The extension has not been activated. In ArcGIS, you can add any desired toolbar to the GUI. However, a few require the activation of an extension, similar to that found in ArcView 3.x. Navigate t...
• Why are the range of values in a grid exported from a Geostatistical Analyst layer different than the range in the Geostatistical Analyst layer?
  The range of values in the grid is based on the values stored in the grid. The default minimum and maximum values displayed for the Geostatistical Analyst layer are obtained from the sample data use...
• Limit the display of a Geostatistical Analyst layer to values that are within the threshold range of the layer
  A Geostatistical Analyst layer can be displayed to only show those areas that are within the default range of threshold values.
• Change the minimum and maximum values used to classify a Geostatistical Analyst layer
  The classification of a Geostatistical Analyst layer can be modified to display values outside of the default range of threshold values.
• Create a cross validation graph so that the root-mean-square-standardized error is close to 1
  Creating cross validation graphs show a good fit, but the root-mean-square-standardized error is not close to 1. When many data points are plotted on a graph, the graph may become crowded and interpr...
• Ensure compliance between ESRI's ArcGIS 9.x Desktop and Leica's LPS 8.7
  Instructions provided describe how to ensure compliance between ESRI's ArcGIS 9.x Desktop and Leica's LPS 8.7. The recent releases of ArcGIS 9.x Desktop; including ArcView, ArcEditor, or ArcInfo lice...
• Can the confidence error of an IDW interpolated raster be calculated?
  No; IDW is a deterministic interpolation. Deterministic approaches do not have any way of calculating a confidence surface. These techniques analyze the neighbors and predict a value. Compare thi...