Hi Jennifer! Have you seen the SF Friends of the Urban Forest street tree web mapper? http://216.103.100.65/mapguide/sftrees/index.aspx
It is built on MapGuide Open Source. The public can create point features for trees not yet mapped. I beleive this app meets your three requirements. I can connect you with the developer if you want to learn more technical details. Best, Stella -- Stella Wotherspoon
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