Certainly someone from DSNY or their contracted groups can respond better but I'll try.
It was always my understanding that the FSDO map was based upon NYC compost project certification of community compost systems on-site, so that at least at one time, the FSDO map was not only a map of locations that one could drop off food scraps but also a map of community composting sites that had been visited and approved by NYC Compost project workers. Indeed I have worked with a community garden to build a community compost bin so that they could get on the list and the site I manage Morris Jumel Community Garden in Washington heights was visited by LESEC to re-certify our site this year - its not clear to me that it was related to the FSDO map participation though.
It would be nice if around this time every year when we are emerging from winter, someone got on this list with information on how to update participation in this list.
That said, we have a growing number of brown bins (people keep leaving them in front of the garden) available 24/7 on the sidewalk and over the winter we just pulled them to the curb on the designated day for DSNY to pick up - it certainly has made it easier on me! Residents of larger than 9 units buildings want to compost and the City currently hasn't given them a way to do it - so we are trying to pick up the slack in ways that are easiest on garden members. I really appreciate that this is the first year I am not hauling full brown bins to the back of our garden in freezing temperatures.
Ellen