2011

DescriptionFile
Grid data files for Canada, Australia, and
New Zealand. Both latitude and longitude
.gsb files *
shifts (as well as accuracy values) are incor-
porated into a single .gsb file. The file
structure also supports the concept of
multiple grids, and subgrids within a major
grid.
Grid data files for United States geography..las and .los files *
See also:
■
Overview of Grid Data Files and Datum Shift Issues (page 103)
■ Grid Data Catalog (GDC) Files (page 104)
■ Grid Data Files for Australia and New Zealand (page 109)
■ Grid Data Files for the United States (page 105)
To modify a coordinate system definition file
1 Find the file to modify in the Autodesk shared coordinate system folder,
by default C:\Documents and Settings\All Users\Application
Data\Autodesk\Geospatial Coordinate Systems.
2 Make a backup copy of the file before modifying it.
NOTE Files that should not be modified are marked with an asterisk (*) in
the table on the Concept tab of this topic.
3 Edit the file in a text editor.
Setting Up Object Classification
■
Overview of Setting Up Object Classification (page 117)
■
Defining an Object Class (page 119)
■
Using Base Object Classes (page 122)
■
Specifying Ranges and Defaults (page 124)
■
Modifying an Object Class Definition (page 127)
■
Creating an Object Classification File (page 128)
116 | Chapter 2 Setting Up