OVERVIEW

The Abandoned Cranberry Bogs datalayer was compiled by the DEP GIS Group from source material provided by the DEP Wetlands Conservancy Program (WCP). The point data set, ABCRAN_PT, contains the location of 537 abandoned cranberry bogs in 41 southeastern Massachusetts municipalities in Barnstable, Bristol and Plymouth Counties.

BARNSTABLE COUNTY BARNSTABLE BOURNE BREWSTER CHATHAM DENNIS EASTHAM FALMOUTH HARWICH MASHPEE ORLEANS SANDWICH TRURO WELLFLEET YARMOUTH

BRISTOL COUNTY ACUSHNET BERKLEY EASTON FAIRHAVEN FREETOWN LAKEVILLE TAUNTON RAYNHAM ROCHESTER

PLYMOUTH COUNTY BRIDGEWATER CARVER DUXBURY EAST BRIDGEWATER HALIFAX HANOVER HANSON HINGHAM KINGSTON MARION MARSHFIELD MATTAPOISETT MIDDLEBOROUGH PEMBROKE PLYMOUTH PLYMPTON WAREHAM

Abandoned cranberry bogs were identified by the DEP WCP from 1:12,000 color infrared (CIR) photography flown in April, 1993. A rough delineation of the boundary of each abandoned bog and an estimated center point was marked on a transparent mylar overlay. The estimated center points of the abandoned cranberry bogs were then visually compiled onto paper 1:25,000 scale base maps generated from MassGIS data and digitized from these paper maps. The area of each abandoned bog was estimated from the rough delineation on the mylar overlay, and the digitized center points were buffered by the estimated area.

Abandoned bogs were identified through evidence of landscape features indicating previous cranberry growing activity, including surface hydrologic features and evidence of ditching or diking. Conducted by experienced wetlands delineators, this method provided accurate assessment of sites greater than 1/2 acre in size that had a high probability of being abandoned cranberry bogs. Comprehensive analysis and processing of the CIRs, combined with field survey work could be expected to identify more possible abandoned cranberry bogs.

ATTRIBUTES

The Abandoned Cranberry Bog datalayer's point attribute table contains the following items:

CBBOG_ID		Unique identifier consisting of flight line number, photo number and ab_unit number
F-LINE CIR		flight line number
PHOTO_		CIR photo number
AB_UNIT_		Unique integer code for each abandoned bog on a CIR
CLASS		Wetlands classification (available for Cape Cod only)
ACRES		Estimated area of abandoned cranberry bog in acres
SQ_FEET		Estimated area of abandoned cranberry bog in square feet (sq. ft.)
RADIUS2		Estimated area of abandoned cranberry bog in sq. ft. divided by pi (used to determine bog buffer radii)
CB_BUF		Bog center point buffer radius in feet
CB_BUF_METERS		Bog center point buffer radius in meters

MAINTENANCE

The Department of Environmental Protection, DEP GIS Group is managing the datalayer.

Last Updated 1/14/2008
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