|
SAMSON
SURFACE MET DATA |
| SAMSON data is derived from
data stored on standard SAMSON CD-ROMs. The first record in the file retrieved from the SAMSON CD-ROMs contains station data. The format of this record is: |
| Columns |
Element |
Definition |
| 001 |
Indicator |
~ to indicate a header record |
| 002-006 |
WBAN Number |
Station number identifier |
| 008-029 |
City |
City where station is located |
| 031-032 |
State |
State where station is located |
| 033-036 |
Time Zone |
The number of hours by which the local standard time lags or leads Universal Time. |
| 039-044 |
Latitude |
Station latitude |
| 039 |
|
N = north of equator |
| 040-041 |
|
Degrees |
| 043-044 |
|
Minutes |
| 047-053 |
Longitude |
Station longitude |
| 047 |
|
W = west, E = east |
| 048-050 |
|
Degrees |
| 052-053 |
|
Minutes |
| 056-059 |
Elevation |
Elevation of the station in meters above sea level. |
The FORTRAN format of this record is:
(1X,A5,1X,A22,1X,A2,1X,I3,2X,A1,I2,1X,I2,2X,A1,I3,1X,I2,2X,I4)
Each variable is represented by a position number. This position number always corresponds to that variable, no matter how many or how few variables are retrieved. The second record contains the list of variables (by a position number) that appear in the data file. There is no particular format; the variable number appears above the column of data it represents with at least one space (and usually many more) between the position numbers.
The third and subsequent records contain the weather elements retrieved from the SAMSON CD-ROMs. The data are free format, i.e., there is at least one space between each element in the record. The year, month, day, hour and observation indicator always appear on each record. These are followed by the variables retrieved by the user. If all the variables were retrieved, they would appear in the following order:
| Position |
Description |
|
Year, month, day, hour (LST), observation indicator |
| 1 |
Extraterrestrial horizontal radiation |
| 2 |
Extraterrestrial direct normal radiation |
| 3 |
Global horizontal radiation |
| 4 |
Direct normal radiation |
| 5 |
Diffuse horizontal radiation |
| 6 |
Total cloud cover |
| 7 |
Opaque cloud cover |
| 8 |
Dry bulb temperature |
| 9 |
Dew point temperature |
| 10 |
Relative humidity |
| 11 |
Station pressure |
| 12 |
Wind direction |
| 13 |
Wind speed |
| 14 |
Visibility |
| 15 |
Ceiling height |
| 16 |
Present weather |
| 17 |
Precipitable water |
| 18 |
Broadband aerosol optical depth |
| 19 |
Snow depth |
| 20 |
Days since last snowfall |
| 21 |
Hourly precipitation amount and flag |
The data files available on
WebMet may not contain all of the above variables - they do contain the
variables required for processing for use with the ISCST3, AERMOD, ISC-PRIME
and CALPUFF models.
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