In putting together an accurate site map, the best reference of all is to observe and experience the site firsthand.
-Watching the water hit the earth and move across it will help in determining where to plant specific crop species. Observing the water’s flow while it is raining will reveal the contours of the land; the natural paths created by the Earth.
-Following the sun’s path is also important, because it determines where to orient your house and the built/planted features around it.
-Understanding where the wind flow is coming from will also allow you to find the best location for wind energy as well as the ideal location for windbreaks (this is especially important if you are in Tornado Valley!)
Today, I found two useful maps to supplement the experiential data collected from the site.
A USGS topographic map that illustrates the elevations of the land:
…Free topo maps can be found at the US Geological Survey’s website: http://usgs.gov
And then, I also found a sweet “Anemometer Analysis” done by Kili Radio out of Porcupine, SD a few years back. An anemometer is a device that measures the wind velocity and direction.
That report can be found at the Open Energy Info website: http://en.openei.org/datasets/node/417
Bottom line: KNOW your land spiritually, physically, and mentally. Then, build!