It was short.Long or short? Thanks for the input.
This program used to have an elevation feature as an option which would basically lay out elevation under the map of two points as a bar graph. Unfortunately it has been removed. It was fairly accurate as I recall.It was short.
I have a place that has been verified by multiple lasers and multiple means, to be 1763 yards. The calculator gave 1,737 yards. I have no idea if this is a problem with every spot. I just tried it with this one because I am so absolutely sure of the distance.
There is a 7 degree down angle. I don't believe any of these satellite based programs account for slope when giving measurements. I would have to do the math to see what that straight line distance would be given the angle.
Edit: just did the math, if slope was the only issue, it would have come out to 1,749 yards.
The clear sky consumer grade GPS location error is in the 5 meter range, but the distance measurement is considerably better. Accurately locating property lines or programming a GPS guided missile is subject to the 5 meter limitation. Measuring distances within a property are not. The Google Earth distance measurement is made from a series of scaled photographs. It's accuracy limitation is primarily the resolution of the photograph.Hi,
I did not download/install the program, BUT it runs off Google maps so I would not depend on its' accuracy for anything other than messing around.
Google advises that the Google Maps Longitude and Latitude coordinates could be off by 15+/- meters. If you are calculating distance on an actual roadway Google has directly mapped via its' cars then the margin of error defaults back to standard GPS errors (area dependent) of 5+/- meters.