Global Positioning System: Since the establishment of the CORS station at NJIT, became involved in GPS research as it applies to surveying GIS and Transportation. Main research is in optimal use of GPS for precise location of points and objects. Notable achievements in this area:
Published (or submitted for publication) 5 journal refereed papers
Working on a Mean high water determination project using GPS
Chair of the GPS/Geodetic control committee of the NJ state mapping advisory committee
Geographic Information Systems (GIS): Utilization of parcel mapping as a management tool for (local) government and GIS applications in transportation. Notable achievements in this area:
Co-authored a chapter in the "Digital Parcel Mapping Handbook"
Published 8 journal refereed papers on various GIS topics
Drafted the parcel mapping standards for the state of NJ.
Working on a map-matching project for the TIDE center
Chair of the GIS certification committee of the American Congress on Surveying and Mapping
J. Greenfeld and J. Sens, "Determination of the Orthometric Height of NJI2 CORS Station ," ASCE Journal of Surveying Engineering, Vol.129, No.3, 2003, pp. 110-114.
Greenfeld J. “How Long Must We Wait? The Duration of GPS Observations for Short Baselines Measurements,” Surveying and Land Information Systems, Vol. 63, No. 2, 2003, pp.77-86.
Greenfeld J. “Matching GPS Observations to Locations on a Digital Map," Proceedings of the 81th Annual Meeting of the Transportation Research Board, January 2002, Washington, DC.
Greenfeld J. “Matching GPS Observations to Locations on a Digital Map,” Transportation Research Record, (Publication pending).
J. Greenfeld, "An Analytical Solution for the Amplitude Ratio Method for Determining Mean High Water in Tidal Regions," ASCE Journal of Surveying Engineering, Vol.128, No. 2, May 2002, pp.61-75.
J. Greenfeld, "GIS Certification and its Impact on the Surveying Profession," Coordinate, Fall 2002, Vol. 24, No. 3, pp. 32-37.
J. Greenfeld and J. Sens, "Determination of the Orthomatric Height of NJI2 CORSStation," Coordinate, Fall 2002, Vol. 24, No. 3, pp. 38-41.
J. Greenfeld , "The Four Year Degree - When the Future of the Profession is at Stake," Surveying and Land Information Systems, Vol. 61, No.14, March 2001, pp. 45-50.