def alt2pres(altitude):
press = <NUM_LIT:100> * ((<NUM_LIT> - altitude) / <NUM_LIT>) ** (<NUM_LIT:1> / <NUM_LIT>)<EOL>return press<EOL>
Determine site pressure from altitude.

Parameters
----------
altitude : numeric
    Altitude in meters above sea level

Returns
-------
pressure : numeric
    Atmospheric pressure (Pascals)

Notes
------
The following assumptions are made

============================   ================
Parameter                      Value
============================   ================
Base pressure                  101325 Pa
Temperature at zero altitude   288.15 K
Gravitational acceleration     9.80665 m/s^2
Lapse rate                     -6.5E-3 K/m
Gas constant for air           287.053 J/(kgK)
Relative Humidity              0%
============================   ================

References
-----------
[1] "A Quick Derivation relating altitude to air pressure" from
Portland State Aerospace Society, Version 1.03, 12/22/2004.