performance specification digital terrain elevation data

MIL-PRF-89020BField Length CharacterField Contents In Characters Start Description0000-9999 4 282 Number of Latitude lines.For magnetic tape, this is theactual count of the number oflatitude points (rows thatcontain data).For CD-ROM, this is the countof the number of latitudepoints in a full one-degreecell. (e.g. 1201 for DTED1,3601 for DTED2.0000-9999 4 286 Number of Longitude lines.For magnetic tape, this is theactual count of the number oflongitude points (columns thatcontain data).For CD-ROM, this is the countof the number of longitudepoints in a full one-degreecell. The count is based onthe level of DTED and thelatitude zone of the cell.(See Table II and III).00 or 01-99 2 290 Partial Cell Indicator00 = Complete 1° cell01-99 = % of data coverage.101 292 Reserved for NIMA use only.(Free text or Blank filled.)100 393 Reserved for producingnation use only. (Free textor blank filled.)156 493 Reserved for free textcomments. (Free text orBlank filled.)e. Accuracy Description (ACC) Record. The ACC is used formagnetic tape and CD-ROM.Fixed Length = 2700 ASCII CharactersField Length CharacterField Contents In Characters Start DescriptionACC 3 1 Recognition Sentinel.0000-9999 or 4 4 *Absolute Horizontal AccuracyNot Available (NA)of Product in meters0000-9999 or 4 8 *Absolute Vertical AccuracyNot Available (NA)of Product in meters0000-9999 or 4 12 *Relative (Point-to-Point)Not Available (NA)Horizontal Accuracy of Productin meters.27