ISEN-ASTC-L is a service of the Association of Science-Technology Centers Incorporated, a worldwide network of science museums and related institutions. ***************************************************************************** In response to Mac's question, Casey Trees Endowment in Washington, DC, uses a GPS system to inventory trees in public spaces and track their health. The maps are available online, along with associated data. http://caseytrees.org/treemap/index.html They were among the first to use this system and I'm sure would be happy to refer you to the source of the software. (I'm a volunteer "Citizen Forester" with the organization so could provide contacts off-list.) Wendy ___________________________ Wendy Pollock Director, Research, Publications, and Exhibitions Association of Science-Technology Centers 1025 Vermont Avenue NW, Suite 500 Washington, DC 20005-6310 USA 202/783-7200 x114 Fax 202/783-7207 [log in to unmask] *********************************************************************** More information about the Informal Science Education Network and the Association of Science-Technology Centers may be found at http://www.astc.org. To remove your e-mail address from the ISEN-ASTC-L list, send the message SIGNOFF ISEN-ASTC-L in the BODY of a message to [log in to unmask]