If it were NAD27, it would have been *way* off (about 212 meters in my area).įrank – Tried turning the terrain off, and repeating the process. Xenonofarcticus – The DOQQ started out life in NAD83 UTM 12, and was re-projected with Global Mapper to WGS84 geographic coordinates. On a computer, the resolution is essentially limited to how far I can blow up the image, the pixel size, and how klutzy I am in positioning the cursor. That’s not the case for a digitized orthophoto, since the measurements are done by the computer. The stated error comes when you try to make measurements on a printed paper copy of the photo – your capability to mark a position on the map is limited by its size, and your ability to measure distances by hand.
#GOOGLE MAP COORDS PDF#
Note: If you have info about the Google Earth or Google Maps coordinate shift for your area, please post it in the comments section below (location and size of shift).Īnonymous: The doc you reference refers to published maps in paper format (check the date of the PDF spec). It wouldn’t surprise me if the magnitude and the direction of the shift varied from place to place if you’re hoping to use either Google Maps or Google Earth for determining positions with high accuracy, you should definitely do a ground check first to see what degree of coordinate shift there may be in your area. So you’ll get consistency if you export data from Google Maps “My Maps” to Google Earth, but the coordinates you get in the Google Maps KML file can still be off from the true values. That’s comparable in size and direction to what I saw in my previous post on Google Earth accuracy. With blue being the Google Maps point, and red the Google Earth point, you can see they’re displaced from the actual position by about 10 meters, or a bit more than 30 feet. So coordinates match up reasonably well between Google Earth and Google Maps.īut if I plot these points on top of a georeferenced USGS aerial photo: There’s a slight differential in the two, about 2.5 meters, but that’s almost certainly due to my inability to position the points exactly in the right location in both images, i.e. GM point is from Google Maps, GE Point from Google Earth. Next, I created a point at the same location in Google Maps “My Maps”:Įxporting the Google Maps point as a KML file, bringing it in to Google Earth, enlarging the view, and measuring the difference between the two:
With the new Google Maps “My Maps” feature, I was curious as to whether you get any improvement in positional accuracy using Google Maps to create KML files for a point, rather than using Google Earth directly.įirst, I created a point in Google Earth at a highway intersection: The Google Earth coordinates corresponding to a feature on the earth can be off from the true coordinates of the feature, about 30 feet in my neck of the woods. You can also visit our French, Spanish, German, Dutch partner sites: | | | posted before about absolute positional accuracy issues in Google Earth. You can create links to custom maps to share with your friends or customers. Just login and your points of interest will be available on all your devices (and on all the pages). This is especially useful if you look for specific places on a device like your desktop, in order to use them later on with your mobile or your tablet. Once logged in, just click on the star inside the infowindow on the map to add the point to your bookmark list (you can find it under the map on any page).
:max_bytes(150000):strip_icc()/003_latitude-longitude-coordinates-google-maps-1683398-5bcfc8b3c9e77c0051bb6da6.jpg "google map coords")
#GOOGLE MAP COORDS FREE#
You can name any place you bookmarked and make them available through our API.Ĭreate a free account to bookmark your favorite places. Simply click on the "Satellite" button on the map to switch to the Map Satellite view of the chosen GPS location. Get Driving Directions with Google Maps for any mode of transportation: driving, bicycling, transit or walking. We provide you with a map of all countries, and of course a map of the United States. If you don't share your location, the map will just be centered on a default GPS location. We do not keep any record of the location of our users, so feel free to allow the geolocation feature if you find it convenient. Where am I? Your location coordinates are provided by your browser, and we can't access them without your consent. When available, you can also get your location address. We opted to center the map on your current location when possible, using the html5 geolocation feature to find out the latitude and longitude of your location.
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