And ArcGIS Geostatistical

Geostatistics in GIS

With ArcGIS Geostatistical Analyst, you can easily create a continuous surface, or map, from measured sample points stored in a point feature layer or raster layer or by using polygon centroids. The sample points can be measurements such as elevation; depth to the water table; or levels of pollution, as is the case in this tutorial. When used in conjunction with ArcMap, Geostatistical Analyst provides a comprehensive set of tools for creating surfaces that can be used to visualize, analyze, and understand spatial phenomena.

Tutorial scenario

The U.S. Environmental Protection Agency is responsible for monitoring atmospheric ozone concentration in California. Ozone concentration is measured at monitoring stations throughout the state. The locations of the stations are shown here. The concentration levels of ozone are known for all the stations, but the ozone values for other (unmonitored) locations in California are also of interest. However, due to cost and practicality, monitoring stations cannot be placed everywhere. Geostatistical Analyst provides tools that make optimal predictions possible by examining the relationships between all the sample points and producing a continuous surface of ozone concentration, standard errors (uncertainty) of predictions, and probabilities that critical values are exceeded.

The data required to complete the exercises is included on the tutorial data DVD. The tutorial data is also available as a download from the Customer Care website. (You may need to contact the Primary Maintenance Contact at your organization to assist with the download.) When you run the wizard to install this data, check to install the Geostatistical Analyst data (the default installation path is C:\ArcGIS\ArcTutor\Geostatistical Analyst). The following datasets (which are contained in a geodatabase called ca_ozone.gdb) will be used in the tutorial:

Dataset

Description

ca_outline

Outline of California

O3_Sep06_3pm

Ozone point sample values (ppm)

ca_cities

Major California cities

ca_hillshade

A hillshade map of California

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