John Callahan joined the staff of the Delaware Geological Survey as a Research Associate III in February 2008. Mr. Callahan brings to the DGS a combination scientific knowledge and technical skills. John's scientific background is in the areas of climatology and severe weather, atmospheric processes, surface hydrology, and physical geography. John also has significant experience in emerging web and database technologies, GIS/geospatial data analysis, and remote sensing. Currently, John is working on hydrologic processes, particularly related to tidal and stream flood inundation, weather related geohazards, sea level rise, environmental monitoring, and various projects in GIS and remote sensing. Another area of John's activities at DGS is the development and maintenance of DGS's public and internal web sites and data delivery mechanisms, such as web mapping services, DGS publication data downloads, and the Delaware DataMIL.
Before joining the DGS, John was the lead GIS Coordinator and primary technical support person for the University of Delaware. Housed within the Research Data Management Services (RDMS) group within the Office of Information Technologies, John built numerous web mapping applications, worked on a variety of geospatial and statistical analysis projects, and developed and taught many GIS-related and web development workshops. During this time, John was one of of the original team members, and lead developer, that created the Delaware Data Mapping and Integration Laboratory (DataMIL) in 2002, an online data sharing and mapping system for "framework" datasets within Delaware. For this work, John received the ESRI Special Achievement in GIS (SAG) award in 2002, the USGS John Wesley Powell Award in 2003, and presented (along with his wife Tina) DataMIL to over 12,000 attendees during the opening plenary session of the ESRI International User Conference. In addition to the DataMIL, John has contributed to several statewide GIS activities (including managing the Delaware Metadata Clearinghouse, and chair of the GIS Conference committees in 2003 and 2004) and was subsequently the recipient of the 2007 Delaware State Geographic Service Award.
Previous to his employment at UD, Mr. Callahan worked as a GIS Consultant for Environmental Systems Research Institute (ESRI) in King of Prussia, PA and a Remote Sensing Specialist for Earth Satellite Corporation, in Rockville, MD.
Thesis title: Estimation of Precipitable Water Over the Amazon River Basin Using GOES Imagery
Temple University, 1994, B.S., Physics
Temple University, 1994, B.S., Mathematics
American Geophysical Union (AGU)
DelDOT-TMC Weather Group (current)
DEMA State Mitigation Council (current)
Delaware Storm Reporter Advisory Group (current)
DEMA State Mitigation Council (current)
Delaware HAZUS User Group (current)
Delaware Elevation Data Working Group (current)
Delaware Science Olympiad: Remote Sensing Event – Division C, 2003 – 2012
Delaware Geographic Service Award Committee (2012)
GIS@UD User Group (2001-2012)
UD Web Developer Community (2006 - 2011)
Maintainer of the Delaware Geospatial Information Clearinghouse, 2001 - 2007
Chair and member of annual Delaware GIS Conference planning committee, 2001 - 2005
Recognition and Awards
Delaware State Geographic Service Award, 2007
USGS John Wesley Powell Award, 2003
ESRI Special Achievement in GIS (SAG) Award, 2002
Samoteskul, K., Firestone, J., Corbett, J., Callahan, J. (2014). Changing Vessel Routes Could Significantly Reduce the Cost of Future Offshore Wind Projects, Journal of Environmental Management, Volume 141, Pages 146–154.
Callahan, John (2014). Estimation of Precipitable Water Over the Amazon Basin Using GOES Imagery, Master of Science Thesis, Department of Geography, University of Delaware. 221 pages.
Leathers, Daniel J., John A. Callahan, and Kevin R. Brinson (2013). Expansion of the Delaware Coastal Flood Monitoring System. Final Report. Submitted to the DNREC Delaware Coastal Programs. 27 pp.
Tehranirad, B., J.T. Kirby, F. Shi, J.A. Callahan, J.C. Harris, S.T. Grilli and T.S. Tajali Bakhsh (2012). Tsunami hazards on the US East Coast:Inundation Mapping and Tsunami Process Over a Wide Shelf. EOS Transactions AGU, 93 (52), Fall Meeting Supplemental, San Francisco, Dec. 3-7. Abstract NH33A-1645.
Callahan, John A. and William S. Schenck (2012). Delaware Geological Survey Node Development for Inclusion and Participation in the United States Geoscience Information Network (USGIN). Final Report. Submitted to the Arizone Geological Survey. 100 pp.
Bates, A., Samoteskul, K., Callahan, J., Corbett, J., Kempton, W., Madsen, J., Shriver, G., Dvorak, M., Kenney, R., McCormack, R., Harris, K. Noel, L., and Firestone, J. (2012). Delaware Marine Spatial Planning: Offshore Wind Context. Final Report. Center for Carbon-free Power Integration.
Madsen, J., A. Bates, J. Callahan and J. Firestone (2011). Use of Geospatial Data in Planning for Offshore Wind Development. Geospatial Techniques for Managing Environmenal Resources. J. K. Thakur, Singh, S.K., Ramanathan, A., Prasad, M.B.K., Gossel, W. . Heidelberg, Germany, Springer and Capital publication.
William S. Schenck and John A. Callahan (2010). Delaware Geological Survey Digital Imagery Inventory. Final Report. Prepared for the USGS National Geological and Geophysical Data Preservation Program (NGGDPP). 26 pp.
William S. Schenck and John A. Callahan (2009). A New Delaware DataMIL, Digital Mapping Techniques '09 - Workshop Proceedings, USGS Open File Report 2010-1335.
Angelia S. M. Vanderlaan, James J. Corbett, Shannon L. Green, John A. Callahan, Chengfeng Wang, Robert D. Kenney, Christopher T. Taggart, and Jeremy Firestone (2009). Probability and Mitigation of Vessel Encounters with North Atlantic Right Whales, Endangered Species Research, Vol 6, p. 273-285, March 2009.
Chengfeng Wang, John Callahan, and James Corbett (2007). Geospatial Modeling of Ship Traffic and Air Emissions, Proceedings of the ESRI International User Conference, June 2007.
Book chapter/Case Study: Co-edited, with staff at ESRI-Hong Kong, Chapter 4 in "Connecting Our World: GIS Web Services", ESRI Press, 2003.
Callahan, John A., Christina L. Callahan, Richard S. Sacher, Michael B. Mahaffie, William, S. Schenck, Shannon S. Bain, and Robert E. Rinehart (2002). The Delaware DataMIL: A Web-Based Mapping Collaboration, ArcNews, ESRI, Vol. 24, No. 2, Summer 2002. p. 18-19.
DeLiberty, Tracy L., and John A. Callahan (2001), Diurnal Variability of Satellite Derived Precipitable Water in the Amazon Basin, Proceedings of the 11th Conference on Satellite Meteorology and Oceanography, American Meteorological Society. Madison, Wisconsin, Oct. 15-18, p. 196-199.
Deliberty, T.L., J.A. Callahan, A.R. Guillory, and G.J. Jedlovec (2000). A Regional Scale Assessment of Satellite-Derived Precipitable Water in the Amazon Basin. Preprints, 10th Conference on Satellite Meteorology and Oceanography, Long Beach, CA, Amer. Meteor. Soc., 414-417.
Willis, Dawn, Jacqui Wilson, and John Callahan (1999). Teaching Geography with Technology: A Special Summer Institute for Delaware State Teachers, Proceedings of the 84th Annual Meeting of the National Council of Geographic Education, Boston, MA, November 3 – 6, 1999.
DeLiberty, Tracy L. and John A. Callahan (1998). Mesoscale Moisture Variations Associated With Cold Surges In Southern Brazil, Proceedings of the 23rd Conference on Hurricanes and Tropical Meteorology, Dallas, TX, January 1—15, 1999.
First State Geology
Callahan, John (2011), DGS Unveils New Website and Web-Mapping Services, First State Geology, Delaware Geological Survey Newsletter, Vol 28, No. 1, Winter Edition, p. 2.
Callahan, John (2011), Prototype Coastal Flood Monitoring System for Delaware, First State Geology, Delaware Geological Survey Newsletter, Vol 28, No. 1, Winter Edition, p. 3.
Callahan, John (2011), DataMIL Gets a New Look, First State Geology, Delaware Geological Survey Newsletter, Vol 28, No. 1, Winter Edition, p. 4.
Callahan, John (2002), Delaware: A National Map Pilot Project, First State Geology, Delaware Geological Survey Newsletter, Vol 20, No. 1, Winter Edition. p. 2.
The Delaware Coastal Flood Monitoring System, (poster) co-authored with Tina Callahan (DEMAC, UD), Dan Leathers, Kevin Brinson and Linden Wolf (DEOS, UD), Delaware National Estuarine Research Reserve (DNERR) Research Symposium; Dover, DE, March 2014.
Changing Vessel Routes Could Significantly Reduce the Cost of Future Offshore Wind Projects, (poster) co-authored with Kateryna Samoteskul (NOAA), Jeremy Firestone (UD) and James Corbett (UD); Society for Benefit-Cost Analysis 2014 Annual Conference and Meeting, March 2014.
Costs and Benefits of Rerouting Vessel Traffic to Open Shallow Waters for Offshore Wind Development, (poster) co-developed with Kateryna Samoteskul, Jeremy Firestone and James Corbett (UD); AWEA Windpower Conference, May 2013.
The Delaware Coastal Flood Monitoring System, Delaware Sea-Level Rise Advisory Committee Meeting. St. Jones Reserve, April 2013.
The Role of the Delaware Geological Survey in Support of Delaware’s Planning and Preparedness for Hurricane Sandy, co-authored with David Wunsch and Kelvin Ramsey (DGS); 48th Annual Meeting of the Geological Society of America – Northeastern Section, March 2013.
The Delaware Coastal Flood Monitoring System, Delaware Estuary Science and Environmental Summit, Cape May, NJ, January 2013.
Evaluation of Water Level Forecasts from Hydrodynamic Models in Delaware Bay, (poster) co-authored with Linden Wolf, Kevin Brinson, Daniel Leathers, Weihan Chan, Alison Hayes (Dept of Geography, UD); Delaware Estuary Science and Environmental Summit, Cape May, NJ, January 2013.
The Delaware Geologic Information Resource (DGIR), (poster) co-authored with David Wunsch and Sandy Schenck (DGS); Delaware Estuary Science and Environmental Summit, Cape May, NJ, January 2013.
Tsunami Hazards on the US East Coast: Inundation Mapping and Tsunami Processes over a Wide Shelf, (poster) co-authored with Babak Tehranirad, James T Kirby, Fengyan Shi, Jeffrey C Harris, Stephan T Grilli, Tayebeh S Tajali Bakhsh, Elise Estibals; American Geophysical Union Fall Meeting, December 2012.
Costs and Benefits of Rerouting Vessel Traffic to Open Shallow Waters for Offshore Wind Development, (poster) co-authored with Kateryna Samoteskul, Jeremy Firestone, John Callahan and James Corbett (CEOE, UD). AWEA Offshore WINDPOWER Conference, October 2012.
A Coastal Flood Monitoring System for Delaware, Association of American Geographers (AAG) Annual Meeting, New York, April 2012.
A Web-based System for the Delivery of Hydrogeologic Data, Delaware Estuary Science and Environmental Summit, February 2011.
A Prototype Coastal Flood Monitoring System for Delaware", Delaware Estuary Science and Environmental Summit, February 2011.
Development of a GIS Database in a Marine Spatial Planning Context for Offshore Wind Power in Delaware, Delaware Estuary Science and Environmental Summit, February 2011.
Opening Geospatial Information: Trends and Technology, plenary presentation for UD Geospatial Research Day, November 2009
A New Campus Mapping Initiative at the University of Delaware, UD Building and Maps Team, Newark, DE, June 2008.
Google Maps Technical Workshop, Delaware State 2007 Conference, June 2007
GIS Portals and Web Mapping Services, Guest panelist for Northeast Map Organization (NEMO) Annual conference, New York, NY, June 2007.
The Hitchhikers Guide to the Galaxy of Geospatial Metadata, Technical workshop for the Delaware State GIS Conference, June 2006.
Introduction to GIS, Two-day workshop to College of Marine and Earth Science, Lewes, DE, January 2006.
Introduction to ArcIMS and WMS Web Mapping Services: What Are They and How Can I Use Them?, Technical workshop for Delaware State GIS 2004 Conference, April 2004.
The University of Delaware: A Self-Sustaining GIS Community, co-presented with Christina Callahan, 2003 ESRI Education User Conference, San Diego, CA, July 2003.
The Delaware DataMIL: Delaware's Geography Network and contribution toward The National Map, University Consortium of Geographic Information Science (UCGIS) Winter Meeting, Presentations to Congress, February, 2003.
Status of Geographic Information Systems in Delaware, Center for Remote Sensing Seminar Series, University of Delaware, Newark, DE, November 2002.
Internet Mapping using ArcIMS, Two-day seminar, USGS Mid-Continent Mapping Center, USGS Central Region, Rolla, MO, August 2002.
The Delaware DataMIL, ESRI User Conference plenary (12,000+ attendees), San Diego, CA, July 2002.
The Delaware Data Mapping and Integration Laboratory (DataMIL), Plenary presentation at the Delaware State GIS Conference, Rehoboth Beach, DE, April 18, 2002.
The Delaware Data Mapping and Integration Laboratory (DataMIL), Plenary presentation at the ESRI Federal User Conference, Washington, D.C., April 3, 2002.
The Delaware Data Mapping and Integration Laboratory (DataMIL), briefing to the USGS Cooperative Topographic Mapping (CTM) Group, USGS Headquarters, Washington, D.C., March 20, 2002.
The Delaware Data Mapping and Integration Laboratory (DataMIL), USGS The National Map Developer’s Workshop, EROS Data Center, USGS, Sioux Falls, SD, March 6-8, 2002.
The State of GIS in Delaware, University of Delaware, Department of Geography Seminar Series, February 15, 2002.
GIS Career Student Workshop, University of Delaware, November 2001.
Integrating GPS and GIS, Technical workshop, Delaware Geographic Alliance, Fifer Middle School, October, 2001.
Geography and Technology workshop, c-developed/taught 3-day workshop for Delaware Geographic Alliance Technology Institute, University of Delaware, July 23 – 25, 2001.
Geography and Technology in the Classroom with Special Focus on the ArcView Geographic Information System, workshop as part of the Advanced Teacher Institute held at the University of Delaware, Delaware Geographic Alliance (DGA), July 1998.
Estimation of Precipitable Water Fields Over Amazonia Using GOES Imagery, Masters Thesis Defense, University of Delaware, Department of Geography Seminar Series, May 1998.
Geography and Technology with Special Focus on the ArcView Geographic Information System, K-12 Teacher In-service Workshop, St. Mark’s High School, Delaware Geographic Alliance (DGA), April 199