See also the USMARC to FGDC crosswalk.
The FGDC standard specifies the information content of metadata for a set of digital geospatial data. The purpose of the standard is to provide a common set of terminology and definitions for concepts related to these metadata.
The USMARC formats (U. S. Machine Readable Cataloging) are standards for the representation and communication of bibliographic and related information in machine-readable form. A USMARC record involves three elements: the record structure, the content designation, and the data content of the record.
The following crosswalk was done by Elizabeth Mangan,
Geography and Map Division, Library of Congress.
| FGDC tag | FGDC name | USMARC tag |
| 1.2.1 | abstract | 520 |
| 1.2.2 | purpose | 500 |
| 1.2.3 | supplemental information | 500 |
| 1.3.1 | currentness reference | 500 |
| 1.4.1 | progress | 583 l |
| 1.4.2 | maintenance and update frequency | 310 c |
| 1.5.1.1 | west bounding coordinate | 034 d |
| 1.5.1.2 | east bounding coordinate | 034 e |
| 1.5.1.3 | north bounding coordinate | 034 f |
| 1.5.1.4 | south bounding coordinate | 034 g |
| 1.5.2.1.1 | g ring latitude | 034 s |
| 1.5.2.1.2 | g ring longitude | 034 t |
| 1.6.1.1 | theme keyword | 650 a |
| 1.6.1.1 | theme keyword thesaurus | 650 2 |
| 1.6.2.1 | place keyword thesaurus | 651 2 |
| 1.6.2.2 | place keyword | 651 a |
| 1.6.3.1 | stratum keyword thesaurus | 651 2 |
| 1.6.3.2 | stratum keyword | 650 a |
| 1.6.4.1 | temporal keyword thesaurus | 651 2 |
| 1.6.4.2 | temporal keyword | 650 a |
| 1.7 | access constraints | 506 a |
| 1.8 | use constraints | 540 a |
| 1.10.1 | browse graphic file name | 856 f |
| 1.10.2 | browse graphic file description | 856 z |
| 1.10.3 | browse graphic file type | 856 z |
| 1.11 | data set credit | 700, 710, 711 |
| 1.12.1 | security classification system | 355 e |
| 1.12.2 | security classification | 355 a |
| 1.12.3 | security handling description | 355 b |
| 1.13 | native data set environment desc | 538 |
| 2.1.1 | attribute-accuracy-report | 514 a |
| 2.1.2.1 | attribute accuracy value | 514 b |
| 2.1.2.2 | attribute accuracy explanation | 514 c |
| 2.2 | logical consistency report | 514 d |
| 2.3 | completeness report | 514 e |
| 2.4.1 | horizontal positional accuracy report | 514 f |
| 2.4.1.2.1 | horizontal positional accuracy value | 514 g |
| 2.4.1.2.2 | horizontal positional accuracy explanation | 514 h |
| 2.4.2.1 | vertical positional accuracy report | 514 i |
| 2.4.2.2.1 | vertical positional accuracy value | 514 j |
| 2.4.2.2.2 | vertical positional accuracy explanation | 514 k |
| 2.5.1.2 | source scale denominator | 786 m |
| 2.5.1.3 | type of source media | 786 h |
| 2.5.1.4.1 | source currentness reference | 786 j |
| 2.5.1.5 | source citation abbreviation | 786 p |
| 2.5.1.6 | source contribution | 786 v |
| 2.5.2.1 | process description | 583 a |
| 2.5.2.2 | source used citation abbreviation | 786 p |
| 2.5.2.3 | process date | 583 c |
| 2.5.2.4 | process time | 583 c |
| 2.5.2.5 | source produced citation abbreviation | 583 b |
| 2.6 | cloud cover | 514 m |
| 3.1 | indirect spatial reference | 352 i |
| 3.2 | direct spatial reference method | 352 a |
| 3.3.1.1 | sdts point and vector object type | 352 b |
| 3.3.1.2 | point and vector object count | 352 c |
| 3.3.2.1 | vpf topology level | 352 g |
| 3.3.2.2 | vpf point and vector object type | 352 b |
| 3.4.1 | raster object type | 352 b |
| 3.4.2 | row count | 352 d |
| 3.4.3 | column count | 352 e |
| 3.4.4 | vertical count | 352 f |
| 4.1.1.1 | latitude resolution | 342 c |
| 4.1.1.2 | longitude resolution | 342 d |
| 4.1.1.3 | geographic coordinate units | 342 b |
| 4.1.2.1.1 | map projection name | 342 a, 255 b |
| 4.1.2.1.2.1 | standard parallel | 342 e |
| 4.1.2.1.2.2 | longitude of central meridian | 342 g |
| 4.1.2.1.2.3 | latitude of projection origin | 342 h |
| 4.1.2.1.2.4 | false easting | 342 i |
| 4.1.2.1.2.5 | false northing | 342 j |
| 4.1.2.1.2.6 | scale factor at equator | 342 k |
| 4.1.2.1.2.7 | height of perspective point above surface | 342 l |
| 4.1.2.1.2.8 | longitude of projection center | 342 g |
| 4.1.2.1.2.9 | latitude of projection center | 342 h |
| 4.1.2.1.2.10 | scale factor at center line | 342 k |
| 4.1.2.1.2.11.1 | azimuth angle | 342 m |
| 4.1.2.1.2.11.2 | azimuth measure point longitude | 342 n |
| 4.1.2.1.2.12.1 | 342 e | |
| 4.1.2.1.2.12.1 | oblique line latitude | 342 e |
| 4.1.2.1.2.12.2 | 342 f | |
| 4.1.2.1.2.12.2 | oblique line longitude | 342 f |
| 4.1.2.1.2.13 | straight vertical longitude from pole | 342 n |
| 4.1.2.1.2.14 | scale factor at projection origin | 342 k |
| 4.1.2.1.2.15 | landsat number | 342 o |
| 4.1.2.1.2.16 | path number | 342 o |
| 4.1.2.1.2.17 | scale factor at central meridian | 342 k |
| 4.1.2.4.3.1 | distance resolution | 343 e |
| 4.1.2.4.3.2 | bearing resolution | 343 f |
| 4.1.2.4.3.3 | bearing units | 343 a |
| 4.1.2.4.3.4 | bearing reference direction | 343 n |
| 4.1.2.4.3.5 | bearing reference meridian | 343 i |
| 4.1.2.4.4 | planar distance units | 343 b |
| 4.1.3.1 | local description | 342 v |
| 4.1.3.2 | local georeference information | 342 w |
| 4.1.4.1 | horizontal datum name | 342 a |
| 4.1.4.2 | ellipsoid name | 342 q |
| 4.1.4.3 | semi major axis | 342 r |
| 4.1.4.4 | denominator of flattening ratio | 342 s |
| 4.2.1.1 | altitude datum name | 342 a |
| 4.2.1.2 | altitude resolution | 342 t |
| 4.2.1.3 | altitude distance units | 342 b |
| 4.2.1.4 | altitude encoding method | 342 u |
| 4.2.2.1 | depth datum name | 342 a |
| 4.2.2.2 | depth resolution | 342 t |
| 4.2.2.3 | depth distance units | 342 b |
| 4.2.2.4 | depth encoding method | 342 u |
| 5.1.1 | entity type label | 551 a |
| 5.1.1.2 | entity type definition | 551 b |
| 5.1.1.3 | entity type definition source | 551 b |
| 5.1.2.1 | attribute label | 551 c |
| 5.1.2.2 | attribute definition | 551 d |
| 5.1.2.3 | attribute definition source | 551 d |
| 5.1.2.4.1.1 | enumerated domain value | 551 e |
| 5.1.2.4.1.2 | enumerated domain value definition | 551 f |
| 5.1.2.4.1.3 | enumerated domain value definition source | 551 f |
| 5.1.2.4.2.1 | range domain minimum | 551 g |
| 5.1.2.4.2.2 | range domain maximum | 551 g |
| 5.1.2.4.3.1 | codeset name | 551 h |
| 5.1.2.4.3.2 | codeset source | 551 h |
| 5.1.2.4.4 | unrepresentable domain | 551 i |
| 5.1.2.5 | attribute units of measure | 551 j |
| 5.1.2.6 | attribute measurement resolution | 551 j |
| 5.1.2.7 | beginning date of attribute values | 551 k |
| 5.1.2.8 | ending date of attribute values | 551 k |
| 5.1.2.9.1 | attribute value accuracy | 551 l |
| 5.1.2.9.2 | attribute value accuracy explanation | 551 m |
| 5.1.2.10 | attribute measurement frequency | 551 n |
| 5.2.2 | entity and attribute detail citation | 551 p |
| 6.2 | resource description | 037 n |
| 6.3 | distribution liability | 856 z |
| 6.4.1 | non-digital-form | 037 f |
| 6.4.2.1.1 | format name | 037 g |
| 6.4.2.1.2 | format version number | 037 g |
| 6.4.2.1.3 | format version date | 037 g |
| 6.4.2.1.4 | format specification | 037 h |
| 6.4.2.1.5 | format information content | 037 n |
| 6.4.2.1.6 | file decompression technique | 037 n |
| 6.4.2.1.7 | transfer size | 037 g |
| 6.4.2.2.1.1.1.1 | network resource name | 856 f |
| 6.4.2.2.1.1.2.1 | lowest bps | 856 j |
| 6.4.2.2.1.1.2.2 | highest bps | 856 j |
| 6.4.2.2.1.1.2.3 | number databits | 856 r |
| 6.4.2.2.1.1.2.4 | number stopbits | 856 r |
| 6.4.2.2.1.1.2.5 | parity | 856 r |
| 6.4.2.2.1.1.2.6 | compression support | 856 c |
| 6.4.2.2.1.1.2.7 | dialup telephone | 856 b |
| 6.4.2.2.1.1.2.8 | dialup file name | 856 f |
| 6.4.2.2.1.2 | access instructions | 856 i |
| 6.4.2.2.1.3 | online computer and operating system | 856 o |
| 6.4.2.2.2.1 | offline media | 037 f |
| 6.4.2.2.2.2.1 | recording density | 037 g |
| 6.4.2.2.2.2.2 | recording density units | 037 g |
| 6.4.2.2.2.3 | recording format | 037 g |
| 6.4.2.2.2.4 | compatibility information | 037 n |
| 6.4.3 | fees | 037 c |
| 6.4.4 | ordering instructions | 037 n |
| 6.4.5 | turnaround | 037 c |
| 6.5 | custom order process | 037 n |
| 6.6 | technical prerequisites | 037 n |
| 7.1 | metadata date | 583 c |
| 7.2 | metadata review date | 583 z |
| 7.3 | metadata future review date | 583 z |
| 7.5 | metadata standard name | 583 f |
| 7.6 | metadata standard version | 583 f |
| 7.7 | metadata time convention | 583 z |
| 7.8 | metadata access constraints | 506 3, 506 a |
| 7.9 | metadata use constraints | 540 3, 540 a |
| 7.10.1 | metadata security classification system | 355 c |
| 7.10.2 | metadata security classification | 355 a |
| 7.10.3 | metadata security handling description | 355 b |
| 8.4 | title | 730, 740, 245 a & b |
| 8.5 | edition | 250 |
| 8.6 | geospatial data presentation form | 500 |
| 8.7.1 | series name | 440 a, 410 except v; 810 except v; 830 a |
| 8.7.2 | issue identification | 410 v, 440 v, 810 v, 830 v |
| 8.8.1 | publication place | 260 a |
| 8.8.2 | publisher | 260 b |
| 8.9 | other citation details | 500 |
| 8.10 | online linkage | 856 u |
| 9.1.1 | calender date | 045 b |
| 9.1.2 | time of day | |
| 9.3.1 | beginning date | 045 b |
| 9.3.1 via 6.7 | beginning date | 037 c |
| 9.3.2 | beginning time | |
| 9.3.2 via 6.7 | beginning time | 037 c |
| 9.3.3 | ending date | 045 b |
| 9.3.3 via 6.7 | ending date | 037 c |
| 9.3.4 | ending time | |
| 9.3.4 via 6.7 | ending time | 037 c |
| 10.4.5 | postal code | 270 c |
| 10.4.6 | country | 270 d |
| 10.5 | contact voice telephone | 270 k |
| 10.6 | contact tdd/tty telephone | 270 h |
| 10.7 | contact facsimile telephone | 270 l |
| 10.8 | contact electronic mail address | 270 m |
| 10.9 | hours of service | 270 r |