AccessGrid.org

Using Google Maps to determine GPS location

The Access Grid Node Listing lets one specify GPS coordinates of an Access Grid. These show up as a link to an appropriately centred Google Map. In future, GPS coordinates can be used for inferring time zones, drawing maps of world-wide Access Grid usage, etc. As we encourage all node listings to have accurate GPS coordinates, here's a guide to finding yours ... If you are already familiar with Google Maps and how to find your location at maximum zoom, skip to the final paragraphs of this document. Otherwise, open a web browser and go to Google Maps at the URL listed in the image below see label (1), http://maps.google.com. Google being a search engine, the simplest way of locating your city is to enter a "city, country" in the search box (2). Alternatively, you can self-navigate: Zoom in/out using the vertical slider adjacent to (3). Pan the image left-right-up-down, either using the buttons above (3) or by "clicking and holding" the left mouse button followed by mouse movement in the desired direction Before proceeding, press the "hybrid" button (4), requesting a combination of satellite imagery and local GIS data (roads, labels, etc.).

 

Google Maps Web page

 

The author's node is located in Canberra, Australia. Entering this into the text entry box and pressing "Search" (5) immediately locates us above the Australian capital's core.

 

Google Maps Canberra Hybrid

 

If you don't see any imagery, confirm that the viewer is in "hybrid" mode (6). If the search doesn't work for your city, country, or the area of interest is "off-screen", use the self-navigation tools listed above (8) to position Google Maps above your locale. In our case, it's now possible to see the Australian National University (7) on the shores of Canberra's man-made lake. We zoom in to the maximum level (9), panning as necessary with "left click and move", before finally double-clicking on our node's exact location.

 

Google Maps Canberra Node

 

With our Access Grid location thus centred, it's time to extract the coordinates. If we select "link to this page" (10), the URL at top (11) changes to reflect our current location and zoom level. Extracting GPS Coordinates

http://maps.google.com/maps?ll=-35.283130,149.113580&spn=0.005025,0.008500&t=h

The desired GPS coordinates are embedded in the URL in "latitude,longitude" format. For the example above the latitude is -35.283130 and the longitude is 149.113580.

Ignore the other values, simply copy/paste the coordinates into your node listing's edit form where is asks for latitude and longitude, the below example is from the SMSCS Computer Science, New Zealand Node.

AccessGrid.org Node edit form

 

 

It's a simple as that.

Note: the latitude and longitude may appear after a long string of characters in the url. Look for the following part of the url "ll="the lat and long should be the next set of numbers.

 

login or register to post comments