Latitude is measured from the equator, with positive values going north and negative values going south. Longitude is measured from the Prime Meridian, the longitude that runs through Greenwich, England), with positive values going east and negative values going west. So, for example, 65 degrees west longitude, 45 degrees north latitude is -65 degrees longitude and +45 degrees latitude.
To convert your site's coordinates from
degrees, minutes, seconds format to decimal format, use this
easy
formula:
degrees + (minutes/60) + (seconds/3600).
For example: Site coordinates of
42º 8' 10"
would be calculated as:
42 + (8/60) + (10/3600) = 42.1361
or
42 + (.1333) + (.0028) = 42.1361.
NOTE: You can round to any decimal place, but is suggested to go to the 4th decimal place.