A, D, F, G, L, M, m, O, P, Q, R, r, S, T, U, u, V, v, W, Z
The coordinates of the corners of the tiles are available under "Image
Info" and - as Sam Fly points out - by zooming in to the highest
magnification, and interpolating to the point of interest
you can measure the coordinates a lot easier than by driving
around with your Garmin.
We have compared several runway
threshholds surveyed by the FAA with the values interpolated from the
Terraserver images, and
one can easily do better than 100 foot accuracy.
You can even
see Sam
on the runway at TSA about to take off.
To measure the coordinates of a potential turnpoint,
you can
start here
and enter the name or a rough latitude and longitude of the location
that you would like to use, or
click on the
world map to home in on your location.
The medium size image seems to work best as you zoom in.
When you get to the highest resolution image select
"image information" to get the coordinates of the corners of the tiles,
and then guesstimate the coordinates of the controlpoint.
You can
practice on the Ennis, Texas runway 33 turnpoint whose coordinates should be
32°19'28",
96°39'43".
Please contact John Leibacher with any suggestions concerning this material.