Running Polygon Attribute Reaggregation System (PARS)

PARS is a series of Arc Macro Language (AML) routines and interactive menus. The system has been designed to operate in two modes: interactive menu mode, and command line mode for batch processing.

Using the PARS Interactive Menu Mode

To start the interactive mode, at the ARC: prompt, type PARS. This will bring up three menu screens: the File Spec menu, the Process Control menu and an information window describing the Nominal, Ordinal, Measure and Count data types.

The File menu is used to identify the Source and Target map coverage file names, as well as an intermediate Union coverage name. The Source and Target coverages can be in the current ARC/INFO workspace, in which case the file names appear on a scrolling list in the File Spec menu, or an alternative file path specification can be typed in. The Union coverage name must be typed in, with an alternate path specification if desired, followed by a return. PARS will prompt the user to specify whether a new union coverage should be made, or whether to use an existing union coverage.

The Process menu is used to specify which item (or data field) within the Source coverage carries the information to be transferred to the Target coverage, and what type of interpolation should be applied. Subsets of Source and Target polygons can be specified by identifying an item names and values from scrolling lists of items within the polygon attribute tables.

The Data Type description window provides brief descriptions of each of the four basic data types. By clicking on the data type choice buttons in the Process menu, each of the four data type descriptions can be displayed. After specifying the item in the source coverage that is to be interpolated, the operator can identify which data type the item is by referring to the descriptions.

Once the appropriate menu choices have been selected, processing is started by clicking the Process button.

NOTE: The source and target coverages must be in the same projection, and the projection must be an "equal area" projection, such as Lambert equal area.

Source: Ballard and Schut., 1995