The map is generally a pretty cheap by-product of two much more expensive processes: planting trees, and maintaining trees. To do any kind of long term strategi

The map is generally a pretty cheap by-product of two much more expensive processes: planting trees, and maintaining trees. To do any kind of long term strategic management of the assets (trees) generally requires knowing what you have, which means a tree survey. That's kind of expensive (say $1 per tree), but cheap compared to the cost of planting a tree and maintaining it. Once you have all that data, to stick it on a public website is easy. Or even better, post it to your open data site, and let opentrees.org use it.