MAGIC File Naming Conventions
These code values are adapted from the Library of Congress's geographic naming tables:
| Code | Geography |
|---|---|
| 370[ 0-9 ] | United States |
| 371[ 0-9 ] |
|
| 372[ 0-9 ] |
|
| 373[ 0-9 ] |
|
| 374[ 0-9 ] |
|
| 375[ 0-9 ] |
|
| 376[ 0-9 ] |
|
| 377[ 0-9 ] |
|
| 378[ 0-9 ] |
|
| 379[ 0-9 ] |
|
| 380[ 0-9 ] |
|
The digit in brackets [0-9] above can be one of the following:
| Code | Geography Type |
|---|---|
| 0 | Regional Geographies |
| 1 | Mathematical Geographies |
| 2 | Physical Geographies |
| 3 | Major Administrative Geographies |
| 4 | Minor Administrative Geographies |
| 5 | Designated Geographies |
| 6 | Census Geographies |
| 7 | Reserved |
| 8 | Reserved |
| 9 | Reserved |
Now we extend the codes for particular types of geographical definitions, loosely based on the Library of Congress. Think of these as the cookie cutter shapes that make the coverage boundaries. The following example is for 378[0-9], Connecticut.
| Code | Geography | |
|---|---|---|
| 3780[x] | Regional Geographies - Connecticut | |
| 37800 | State Coverages | |
| 3781[x] | Mathematical Geographies - Connecticut | |
| 37810 | USGS 3.75 Minute Quarter Quadrangles | |
| 37811 | USGS 7.5 Minute Quadrangles | |
| 37812 | USGS 30 x 60 Minute Quadrangles | |
| 37813 | USGS 1 x 2 Degree Quadrangles | |
| 37814 | Hartford Metropolitan District Commission | |
| 3782[x] | Physical Geographies - Connecticut | |
| 37820 | Drainage Basins | |
| 37821 | Rivers, Streams (running water) | |
| 37822 | Lakes, ponds, marshes, swamps, reservoirs (still water) | |
| 37823 | Islands | |
| 37824 | Coasts and Continental Shelfs | |
| 37825 | Mountainous regions, mountain chains, hills, relief features | |
| 37826 | Roads, Pathways, Rail Lines, Gas Lines, Utility Passages | |
| 37827 | Sounds, Bays, Tidal Marshes (tidal water) | |
| 3783[x] | Major Administrative Geographies - Connecticut | |
| 37830 | State Boundaries | |
| 37831 | County Boundaries | |
| 37832 | Congressional Districts | |
| 37833 | Voting Districts (House and Senate) | |
| 37834 | School Districts (Primary, Secondary, Middle, Unified) | |
| 37835 | Labor Market Areas | |
| 37836 | Planning Districts | |
| 37837 | Judicial Districts | |
| 37838 | Tourism Districts | |
| 37839 | Service Districts | |
| 3784[x] | Minor Administrative Geographies - Connecticut | |
| 37840 | Towns and Townships | |
| 37841 | Town Planning and Zoning | |
| 37842 | Right of Ways | |
| 3785[x] | Designated Geographies - Connecticut | |
| 37850 | Forests and Parks | |
| 37851 | Reservations | |
| 37852 | Military areas of operations, Military installations | |
| 3786[x] | Census Geographies - Connecticut | |
| 37860 | State | |
| 37861 | County | |
| 37862 | Town/MCD | |
| 37863 | CDP | |
| 37864 | Tract | |
| 37865 | Block Group | |
| 37866 | Block | |
| 37867 | MSA/PMSA/CMSA | |
