Charting Ground Zero: Before and After

At Ground Zero: New Technology Aids in the Recovery Effort

"After the terrorist attacks on September 11, emergency workers were faced with the Herculean task of sifting through a surreal landscape of smoking, twisted rubble. One tool that proved indispensable in their efforts was a mapping system -- one that employed the latest technological advancements and took advantage of years of research -- developed and overseen by geographer Sean Ahearn."

Related Articles:

Hunter College Cartographers Aid Workers at Ground Zero: CUNY Matters, December 2001.

Mapping Ground Zero: GEONews, Hunter College, October 2001.

At Ground Zero: New Technology Aids in the Recovery Effort: The Graduate Center of CUNY (web page).

Mapping Out Details of Recovery Effort:, October 10, 2002.

Witness and Responsr: Geography and Map Division:

GIS Plays Key Role in NYC Rescue and Relief Operation: EOS, vol. 82, Number 40, October 2, 2001.

3D Model Rendered from TIN


September 19, 2001

OrthoPhoto 09/19/01

OrthoPhoto 12/19/01

Elevation Difference

9/15 - 10/21/01

Elevation Difference

Before and After 6/1/00 - 9/15/01

TIN from LIDAR 7/01/00

LIDAR 9/19/01

LIDAR 12/19/01

Petroleum Storage Inspection



Evacuation Routes


Photo Overlay with TIN

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