National Transportation Atlas Database ================================================================================ December 1995 Spatial File Formats -------------------- TRANSPORTATION NETWORKS Link File --------- Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'L' 2 VERSION char 2 2 3 Version number 3 REVISION char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 LINKID num 10 14 23 Link ID 6 FEATURID num 10 24 33 Feature ID 7 ANODE num 10 34 43 Node ID for beginning node 8 BNODE num 10 44 53 Node ID for ending node 9 DESCRIPT char 35 54 88 Name/Identification 10 STFIPS1 num 2 89 90 Primary State FIPS Code 11 STFIPS2 num 2 91 92 Secondary State FIPS Code Node File --------- Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'N' 2 VERSION char 2 2 3 Version number 3 REVISION char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 NODEID num 10 14 23 Node ID 6 FEATURID num/char10 24 33 Feature ID 7 LONGITUD num 10 34 43 Longitude (6 implied dec) 8 LATITUDE num 10 44 53 Latitude (6 implied dec) 9 DESCRIPT char 35 54 88 Name/identification 10 STFIPS num 2 89 90 State FIPS code 00 if in multiple states 99 if not in the United States Geography (shape point) File ---------------------------- Header record Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'G' 2 VERSION char 2 2 3 Version number 3 REVISION char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 LINKID num 10 14 23 Link ID 6 blank num 10 24 33 blank 7 blank num 10 34 43 blank 8 NPOINT num 3 44 46 Number of coordinate pairs Shape records The header record is followed by INT(NPOINT + 1 / 4) fixed length shape records. Each shape record contains up to 4 coordinate pairs and is formatted as numeric with 6 implied decimal places. TRANSPORTATION POINT FACILITIES Point File ---------- Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'P' 2 VERSION char 2 2 3 Version number 3 REVISION char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 POINTID num 10 14 23 Point ID 6 FEATURID char 10 24 33 Feature ID 7 LONGITUD num 10 34 43 Longitude (6 implied dec) 8 LATITUDE num 10 44 53 Latitude (6 implied dec) 9 DESCRIP char 35 54 88 Name/identification 10 STFIPS num 2 89 90 State FIPS code 00 if in multiple States 99 if not in the United States AREA FILES Area File --------- Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'A' 2 VERSION char 2 2 3 Version number 3 REVISION char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 POLYID num 10 14 23 Polygon ID 6 FEATURID char 10 24 33 Feature ID 7 CNTRLONG num 10 34 43 Longitude of feature centroid (6 implied dec) 8 CNTRLAT num 10 44 53 Latitude of feature centroid (6 implied decimal) 9 DESCRIPT char 35 54 88 Name/identification 10 STFIPS num 2 89 90 State FIPS code Geography (shape point) File ---------------------------- Header record Field Field Field Field Beg End Field Num Name Type Length Pos Pos Description 1 RECTYPE char 1 1 1 Record type: always 'G' 2 VERSION char 2 2 3 Version number 3 REVISON char 2 4 5 Revision number 4 MODDATE num 8 6 13 Modification date 5 LINEID num 10 14 23 Line ID 6 POLYIDL num 10 24 33 Polygon ID on left 7 POLYIDR num 10 34 43 Polygon ID on right 8 NPOINT num 3 44 46 Number of coordinate pairs Shape records The header record is followed by INT(NPOINT + 1 / 4) fixed length shape records. Each shape record contains up to 4 coordinate pairs and is formatted as numeric with 6 implied decimal places. ================================================================================