There is a need for wetland delineation of greater accuracy than 1:24K scale, particularly for regulatory purposes. A series of techniques for developing a digital wetland data layer has been developed by Massachusetts Department of Environmental Protection (Mass.DEP). This includes wetland interpretation from color infrared aerial (CIR) photos, field checking, and conversion to digital form. Traditionally, the conversion involves zoom-transferring and manual digitizing. The technique developed by Mass.DEP is on-screen. It involves scanning, vectorizing, distortion removal, and transformation into real-world coordinates. Digital orthophotos, ArcScan, and PhotoGIS are used with ArcInfo AML's menu systems in the conversion process in an eXceed windows environment linked to a Sun SPARC 10 workstation.
William J. Guazzo
The Commonwealth of Massachusetts
Department of Environmental Protection
One Winter St., 9th Floor
Boston, MA 02108
Telephone: 617-574-6814
Fax: 617-556-1049
Email: 74170.304@compuserv.com
Feng Yang
The Commonwealth of Massachusetts
Department of Environmental Protection
One Winter St., 9th Floor
Boston, MA 02108
Telephone: 617-574-6876
Fax: 617-556-1049
Email: p9500fyang@umbsky.cc.umb.edu