Introduction
Rarely does a single event help both to transform the value and use of a technology. The World Trade Center (WTC) Disaster was one of those events. What started out as an exclusive technology known to a few and used primarily by experts in the mapping sciences discipline, ended up playing a critical role in almost every aspect of the WTC disaster recovery. Firemen who had never worked a computer were using some of the most advanced mapping technologies ever deployed to log the location of victims and equipment found on the “pile”. They would rely on images produced from an airborne laser-measuring device for command and control at Ground Zero. Building inspectors who had previously depended on paper and pencil to do their inspections were wirelessly tapping into one of the world’s largest urban geographic databases (NYCMap) to retrieve and send the geographic and inspection information of damaged buildings. The immediacy of the moment would drive the innovation necessary to make these developments possible.
Gallery Exhibits
CARSI’s geospatial work at Ground Zero has been presented in major public exhibitions that documented the evolving role of mapping technologies in disaster response, recovery, and collective memory.
- Bertha and Karl Leubsdorf Gallery. Mapping New York (February 15, 2001)
An exhibition highlighting the emergence of digital mapping and urban spatial databases in New York City. (Digital archive)
- Woodward Gallery. Charting Ground Zero: Before and After (February 1, 2002) This exhibit documented the immediate application of GIS and LiDAR technologies in the aftermath of September 11, capturing both destruction and recovery through spatial data. (Digital archive)
- Woodward Gallery. Charting Ground Zero: Ten Years After (September 7 - October 23, 2011) A retrospective exhibition examining the long-term legacy of geospatial technologies in recovery and remembrance. This exhibition is now part of the permanent collection at the National September 11 Memorial and Meusum.
Media Coverage & Public Record (selected list)
- Manhattan Neighborhood Network. (2011, September 13). Let them talk [Television program]. Episode on 9/11 geospatial imaging featuring Prof. Sean Ahearn.
- Fox News. (2011, September 7). New York professor’s mission after September 11th: Charting Ground Zero. [Video].
- Graduate Center. (2003). At Ground Zero: New Technology Aids in the Recovery Effort. The Graduate Center of CUNY.
- Mapping out details of recovery effort. (2002, October 10). Newsday.com. [Link no longer active]
- Hunter College. (2002, February). Charting ground zero exhibit opens in Soho. GeoNews. Hunter College, City University of New York.
- GIS at Ground Zero. (2002, January). GEOWorld. [Link no longer active]
- History Channel. (2002). The World Trade Center: Rise and Fall of an American Icon [Television documentary]. Featuring Prof. Sean Ahearn’s narrative on CARSI’s role in mapping Ground Zero. (Clip 1: LIDAR histor and on YouTube; Clip 2: GPS history)
- Geoplace.com. (2001). How will GIS help fight the war on terrorism? Geoplace. [Link no longer active]
- Bliss, J. (2001, December). Hunter College cartographers aid workers at ground zero. CUNY Matters. The City University of New York.
- Hunter College. (2001, October). Mapping ground zero. GeoNews. Hunter College, City University of New York.
- Goodchild, M. F., & others. (2001, October 2). GIS plays key role in NYC rescue and relief operation. EOS, Transactions, American Geophysical Union, 82(40).
- Library of Congress, Geography and Map Division. (2001). Witness and Response: September 11 Acquisitions at the Library of Congress. Library of Congress.
- McAlary, D. (2001, September 27). Satellites, laser images map topography of terrorism. VOA News.
- Gopnik, A. (2000, November 6). Street furniture. The New Yorker.
Legacy & Impact
Commemorative events, reflection articles, retrospectives, and institutional recognition are highlighted here to illustrate CARSI’s long-term influence:
- CARSI. (2026, September 10). A Commemoration of the Geospatial Response to the Attack on the World Trade Center and Reflections on 25 Years of Progress.
- Ahearn, S. (2025, September 11). Remembering 9/11 with Professor Sean Ahearn: Mapping, Memory, and Recovery
- City of New York. (2022, January 14). Local Law No. 42 of 2022: An act to amend the New York City Charter in relation to designating a geospatial information officer.
- Ahearn, S. (2021, Fall). Charting Ground Zero: The role of geospatial technology a retrospect of two decades past. The Explorer Log.
- GISMO. (2021, September 22). 9/11 GISMO Remembrance Event: Twenty Years Later.
- Lanclos, R. and David LaShell. (2021, September 10). A look back: How a GIS team guided response and recovery after 9/11. Esri Blog.
- CUNY News. (2021, September 9). CUNY Community Recalls Emotional and Physical Toll of 9/11.
- Hunter College and GISMO. (2018, April 23). The Future of GIS in NYC.
- Data & Society Research Institute. (2016, June 16). Alan Leidner. GIS in NYC: Past, Present and Future. Databite No. 82.
- Clinton, W. J. (2002, May 6). Presidential acknowledgment of mapping work at Ground Zero. Presidential Public Leadership Program. [Public statement thanking Professor Sean Ahearn].
These materials demonstrate how CARSI’s geospatial work at Ground Zero shaped emergency response, advanced mapping science, and left a lasting imprint on urban resilience and collective memory.
