Where Am I?

How to determine latitude and longitude given a street address, city, state, province, territory, country or whatever.

Noticing this conceit among Gunroom listswains, many new subscribers to the Gunroom mailing list ask how to add a latitude and longitude location to their signatures.

Below are a handful of sites for finding your coordinates from your street address or by use of interactive map generation:


  Maporama

http://www.maporama.com

Worldwide: The easiest source for latitude and longitude. Select a country, and enter the address as completely as you desire. The latitude and longitude information appears below the map both in degree, minutes, seconds (° ' ") and decimal degrees formats.


  Maptech MapServer

http://mapserver.maptech.com/homepage/

U.S. only: Another easy source for latitude and longitude. Enter the city and state or zip code. Click on the Go! button. Pan and zoom to find the desired location. The latitude and longitude reflecting the location of the cursor appears in degrees:minutes:seconds (° ' ") in the fields to the left of the map.


  Eagle Geocoder

http://www.geocode.com/modules.php?name=TestDrive_Eagle

U.S. only: Another easy source for latitude and longitude. Enter the U.S. address, as completely as you wish. Highlight either Address Info (the default) or Address & Map. Click on the request button. The latitude and longitude information appears both in decimal degrees and degrees:minutes:seconds formats.


 http://www.streetmap.co.uk/

UK only: Latitude and longitude are displayed in the legend below the map. E.g.: ( N51:30:50 W0:06:37 WGS84) which can also be written 51°30'50" N, 0°6'37" W.



http://www.census.gov/cgi-bin/gazetteer-tbl

U.S. only: Enter the U.S. place name or ZIP code. Click on search. Click on map and use the pan and zoom features to zero in on your location.

Or, click on the Tiger image above to go directly to the Tiger Map Server Browser. Good for finding a location based on given latitude and longitude values (decimal form).


Confirm your Coordinates

Worldwide: Enter a latitude and longitude pair to get a map with a marker at those coordinates. Remember, south and west are negative.

 http://www.mapquest.com/maps/latlong.adp

Or enter values below:
Degrees, Minutes, Seconds:
Latitude:
Deg: Min: Sec:
Longitude: Deg: Min: Sec:
Decimal Degrees:
Latitude: Longitude:


To convert decimal form to degrees/minutes/seconds: A conversion script.
Take the decimal part of the coordinate and multiply by 60. This gives you minutes.
Take the decimal part of the minutes and multiply by 60, round to the nearest integer. This gives you seconds. 
Example: 50.802248 N x 1.108611 W

50.802248

-> 50° + 60 x 0.802248 = 48.13488'
-> 50° 48' + 60 x 0.13488 = 8.0928"
-> 50° 48' 8"
1.108611
-> 1° + 60 x 0.108611 = 6.51666'
-> 1° 6' + 60 x 0.51666 = 30.9996"
-> 1° 6' 31"
50° 48' 8" N x 1° 6' 31" W ( Portsmouth Harbour, Portsmouth, GB, location of HMS Victory )

Here is a degree symbol you can cut and paste - °
Or generate it on a PC with a Windows OS: Put on the number lock, hold down Alt, then on the number pad type 0176. It doesn't work if you use the numbers on the keys across the top of the keyboard.
In order to get the Alt-code for any such symbol, click "Start", "Run" and in the little Run window type "charmap". Once the Character Map launches you can just click on any symbol to see the code.

Remember that one minute of latitude is one nautical mile ( one nautical mile = 6080 ft., one statute mile = 5280 ft. ). Minutes of longitude are less... smaller the further one gets from the equator. ( 1 nm x cosine of the latitude )
Adding decimal places doesn't help. Also, the various sites don't always agree, and my GPS receiver disagrees with them all.

- Bill Nyden


Gunroom Home