|
|
|
|
|
|
|
|
|
|
|
|
1138 |
Frederick-Washington South |
USGS |
07/89-08/89 |
0.125 mi. |
E-W |
500 AG |
1835 |
IGRF85 |
OF02-361 |
|
1139 |
Frederick-Washington North |
USGS |
08/89 |
0.125 mi. |
E-W |
500 AG |
1083 |
IGRF85 |
OF02-361 |
|
3075 |
North Carolina Coast |
LKB |
09/75-11/75 |
1 mi. |
E-W |
500 AG |
2400 |
IGRF65 |
OF77-804 |
|
3076 |
Fairfax County |
LKB |
08/75 |
0.5 mi. |
E-W |
500 AG |
850 |
IGRF65 |
OF80-813 |
|
4156 |
Danville |
BGM |
03/94 |
0.5 mi. |
E-W |
400 AG |
3000 |
IGRF90 |
OF94-219 |
Description of Table
No.: Internal USGS
identification number
Name: Internal project name (not always the name used in
publication title)
Flown By: Company or government agency who flew the original
survey
Spacing and Dir.: Primary flight-line spacing and
primary flight-line direction
Altitude: Primary flight altitude in feet; B = barometric
elevation, AG = above ground draped over topography
LnMi.: Approximate total of line miles flown for this survey
Datum: Indicates if a regional field was removed and, if
it could be determined, the base value removed. Total field = no regional
was removed. Arb. (arbitrary) datum = the base value removed was not
stated on the map or in survey reports.
Publication: Brief publication reference*. USGS publications are listed as: Open-File reports
= OFxx-yyyy where xx is the publication year, Bulletins and Professional
Papers = B-yyyy or P-yyyy, Geophysical Maps = GP-yyyy, Miscellaneous
Field Studies Maps = MF-yyyy, Miscellaneous Investigations Maps = I-yyyy.
*For a full reference for USGS publications see: http://library.usgs.gov/