. The Canadian field-naturalist. 506 The Canadian Field-Naturalist Vol. 118 1990 AERIAL PHOTO SURVEY: 1:17 500-scale photos of the whole Island II 1991 FIELD SURVEY: Ground flora data from 4-m2plotsat1200 sannpling points III 1991 FIELD SURVEY: Tree species data from 'variable-radius' plots at 1200 sampling points 1 1 IV PHOTO-INTERPRETATION: demarcation and description of 82 957 forest stands: -* Stand database V TWINSPAN CLASSIFICATION: -? Recognition of 11 ground flora community-types 1 VII ANALYSIS of TWINSPAN GROUPS with the aid of tree canopy and soil series data for the 1200 points: -?
. The Canadian field-naturalist. 506 The Canadian Field-Naturalist Vol. 118 1990 AERIAL PHOTO SURVEY: 1:17 500-scale photos of the whole Island II 1991 FIELD SURVEY: Ground flora data from 4-m2plotsat1200 sannpling points III 1991 FIELD SURVEY: Tree species data from 'variable-radius' plots at 1200 sampling points 1 1 IV PHOTO-INTERPRETATION: demarcation and description of 82 957 forest stands: -* Stand database V TWINSPAN CLASSIFICATION: -? Recognition of 11 ground flora community-types 1 VII ANALYSIS of TWINSPAN GROUPS with the aid of tree canopy and soil series data for the 1200 points: -? Recognition of five forest-types 1 VIII SELECTION of TREE CANOPY & SOIL DRAINAGE CRITERIA for classification of 82 957 stands into five forest-types. VI SOIL SURVEY: Description and mapping of 44 soil series for the Island 1 DATABASE of SOIL SERIES & DRAINAGE CLASS for the 1200 sampling points / XI COMPUTER SORTING of the 82 957 forest stands corresponding to the five forest-types, using the selected tree canopy and soil drainage criteria X DATABASE of SOIL DRAINAGE CLASS for 82 957 forest stands XII COMPUTER MAPPING of the stands corresponding to each of the island's five 1990 forest-types Figure 1. The stages leading to the mapping of the 1990 forest-types on Prince Edward Island: a flow diagram showing the databases used (in the boxes with heavy borders) and the analyses carried out. the 1990-1992 Piince Edward Island Forest Biomass Inventory [I]. The false-colour infra-red photographs resulting from the survey (scale c. 1:17 500) were analysed by trained photo-interpreters in the Forestry Division with the purpose of dividing the total forest- ed area into "stands" which were then recorded on a map as "polygons" [IV]. For the purpose of the photo-interpretation, a stand was taken to be a group of trees having a relatively uniform visual appearance from the air as evident in the aerial photograph. Stands could comprise a single species o
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