MIL-STD-2301 Computer Graphics Metafile Cgm Implementation Standard For The National Imagery Transmission Format StandardThis standard establishes the requirements necessary to implement Computer Graphics Metafiles CGM used for the representation of symbol graphics in the National Imagery Transmission Format Standard NITFS.

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MIL-STD-2301A

continue to be used when the content of the metafile does not contain features which have been added or modified by this revised standard.  NITF 2.0 formatted files will not use the new descriptor nor the modified/add features of this standard.  NITF 2.1 formatted files should use the new descriptor and may exercise the new/modified features.  However, the old descriptor may also appear in NITF 2.1 files for example when re-using existing CGM's produced under the previous version of this standard.

b.  Changed features

Edge Visibility of (0=off, 1=on) vice )1=on). Edge Width of 1 through 100 vice 2, 4, 6. Line Width of 1 through 100 vice 2, 4, 6.

Edge Types of Solid, Dashed, Dotted, Dot-dashed and Dot-dot-dashed vice Solid and Dashed. Line Types of Solid, Dashed, Dotted, Dot-dashed and Dot-dot-dashed vice Solid and Dashed. Font Sizes of 6 through 72 vice 10 through 38.

Interior Styles of Solid, Hatch and Empty vice Solid and Empty. Transparency of (0=off, 1=on) vice (1=on).

Character Set Basic Latin (0020-007E), Latin-1 Supplement (00A0-00FF) and null 0x00 vice

Basic Latin (0020-007E).

Default Elements may optionally be included vice not including. c.  Additional features

Auxiliary Color

Polygon sets

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