• Is the center of GIS, most every processing in GIS we performed is a Geoprocesing.
• Definition (a GIS operation that takes one or more input datasets, performs one or more operations, returns one or more output layers (results))
o Four ways: dialog tool box, command line, model, script
o Model is a workflow chart that can execute multiple processes as one operation, share your idea with others
o Script, a text file contains instructions for geoprocessing of code, batch processing
• model builder
o interactive window used to create models inside of ArcGIS (data, connector, and tools)
• python script
o Every element in ArcMap is actually a ArcObject, ArcGIS is built with a set of ArcObjects
o Each ArcObject has properties and methods
o Python script based on the ArcObjects, through ArcObjects (COM objects) you can access geoprocessor (its peroperties and methods, or ArcObects’ peroperties and methods).