Recently, to commemorate the 9/11 attacks on the U.S., Directions Magazine published a compendium of links to geospatial data related to the event. A review of those links suggests there are two that may be especially useful to those interested in imagery and maps from 9/11. They are:
GIS Community: A Response to Terrorist Attack
A master listing assembled by Directions Magazine.
Witness and Response
A collection of LiDAR, thermal imagery and aerial imagery assembled by the Library of Congress.
The full article as published in Directions Magazine is located here.
Comment: One of the GIS stories of the 9/11 response in New York that few know involves Minnesota. Years before 9/11, the Minnesota Department of Natural Resources had developed a mobile mapping trailer known as the "Mapmobile" as a way of bringing GIS into the field where it could be of most value to the wildfire response community. When 9/11 occurred, the head of the Urban Search and Rescue (USAR) effort for the Twin Towers, Bruce Pfaff, knew of the capability and requested its deployment. Upon its arrival in New York City a few days after the attacks, the Mapmobile became the USAR situational awareness hub as Mapmobile staff continuously generated updated search and rescue maps for all parts of the collapsed structures.