performance specification digital terrain elevation data

MIL-PRF-89020Bb. File Header Label (HDR). The HDR is used for magnetic tape only.Field ContentsField LengthIn CharactersCharacterStartDescriptionHDR 3 1 Recognition sentinel.1 1 4 Fixed by standard.Filename 17 5 *Left-justified filenameSystem Name 6 22 *Name of system creatingtape (e.g., DPDW1, DPDW2,DCAFE, IEC).0001 4 28 *Reel sequence numberwithin a file.0001 - NNNN 4 32 *File sequence numberwithin a reel.0001 4 36 *Generation and version00 2 40 numbers which are fixedat 1 and 0.bYYDDD 6 42 Creation date of tape. (Ablank followed by twocharacters for the year,followed by threecharacters for the day (001through 366) within theyear date tape waswritten.)20