To add a new location, enter all the requested information, click OK and you will have created a new location which is added to the main Desktop Radiance database and can be accessed by other projects.
Figure 2. The Add New Location Dialog Box
The "City" field is required, however it does not have to be a real city. The latitude is an angular measurement that defines where your location is relative to the equator. The latitude of the equator is equal to 0. The latitude of the North and South poles is 90 and –90, respectively. The number you would enter for the latitude of your location is between 90 and –90. It should be entered in decimal form. From 0 to 90 is in the northern hemisphere and from 0 to –90 is in the southern hemisphere. So, for example, the approximate latitude of Athens, Greece would be Lat 37.9. This number means that Athens is 37.9 degrees north of the equator.
The longitude is an angular measurement that defines your location relative to the standard meridian in Greenwich, England. The longitude of the Greenwich Meridian is equal to zero. The number you would enter for the longitude of your location is between –180 and 180. Longitudes west of Greenwich are positive and those east of Greenwich are negative. Like the latitude, the longitude should also be entered in decimal form. Using Athens, Greece as an example again…Athens has a longitude of –23.7. This number means that Athens is 23.7 degrees east of Greenwich, England.
The Time Zone allows you to give the name of the time zone that your location is in, for example Pacific Standard Time, or PST. If you don't know which Time Zone you should be using or if yours is not listed, chose "Other…" from the bottom of the list and then fill in the Standard Meridian field.
Standard Meridian is the longitude of the middle of your time zone. To find it you calculate the difference in time between the new location and the Greenwhich, England timezone and multiply that number by 15. In equation form, the standard meridian looks like this: (GMT)-(your time)*15)=Standard Meridian. For Athens-Greece, it's -2*15, so the Standard Meridian is -30. Hint: Standard meridian is always an interger, multiple by 15.
If you don't know the time difference between your time zone and Greenwich Mean Time, there are many resources on the internet.
The following website allows you to easily find the latitude and longitude of your location within the United States:
http://www.census.gov/cgi-bin/gazetteer If your location is not in the United States then you can visit the following website to find the latitude and longitude of your location, click on the "Access GEOnet" button:
