Department of Veterans Affairs
National Cemetery System
Warning: When moving files between platforms, check the file naming
conventions of the platform to which the files are moved. When files are
moved to a PC, the filenames are limited to 8 characters. When moving files
to a UNIX work station, be aware of the case sensitive filenames. It is usually
preferable to name all UNIX files in lower case.
C. Working Units
The resolution and scaling of the design file affects the accuracy and
expanse of the drawing (design plane). The working units, or number of
positional units used to define the sub units and master units, will determine
the accuracy and expanse of the design file. The accepted working units for
all drawing files, except civil/site and surveying/mapping applications, will be
feet, inches, and 2,032 positional units, i.e.:
Imperial
Metric
Master Units:
1
Master Units:
1
Sub Units:
12
Sub Units:
1000
Positional Units
2032
Positional Units:
80
For gravesite layout, surveying and mapping, as well as civil site
applications, the working units will be feet, 1/1,000 of a foot, and 1 positional
unit, i.e.:
Imperial
Metric
Master Units:
FT
Master Units:
M
Sub Units
1000 TH
Sub Units:
100 CM
Positional Units:
1
Positional Units:
10
D. Global Origin
The location of the global origin should be at the global lower left corner of
the X-Y design plane (0,0). The location for 3-Dimensional design files
should be at the global lower left corner for the X-Y-Z design plane (0,0,0).
This global origin shall be used when one is not otherwise defined in the
various application standards.
NCS CADD Standards Manual
August 1995
9
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