-Example of on-screen, overlapping vectorization of forest polygons within DVP. Yellow points display the locations of stand height estimates. Black measuring mark is resting on lake surface. Control of vector colors in DVP can be used to pass attributes to ArcView GIS.  

Contexts in source publication

Context 1

... streams that were not visible due to canopy obstructions were assigned an arbitrary width of 3.05 meters (10 ft.) by buffering extracted vectors. A preliminary land use theme composed of forest, agriculture and bare soil conditions was vectorized in DVP, saved to an ASCII file and passed into ArcView via a script that utilized the AUTOCOMPLETE function to automatically convert overlapped polylines into contiguous polygons (Figure 3). The herbaceous polygon was calculated as the area within the change plot area that remained after the intersection of impervious surfaces, water and the aforementioned preliminary land use themes. ...

Context 2

... were assigned to each of the 255 forested polygons in 1989 as a subjective selection of several dominant trees in the polygon. Forest polygon delineations were initially made to homogenize the stand type and size conditions as much as possible (Figure 3). Height estimates (n=961) were brought into ArcView as a point theme and matched with their corresponding forest polygon record number and a 1:24,000 scale, 30 meter,digital elevation model (DEM) (Figures 4 and 5). ...

Context 3

... the southeastern Durham plot, a first order stream was added to the (USGS 7.5' "blue line") drainage network based on interpreted topography and vegetation shifts within the drain (Figure 13). This drainage was visited in the field in 1998 (during a dry spell) and found to contain no surface water flow. ...

Context 4

... compare estimates of forest fragmentation between the CEO 89 TM and the SCPI 89, the 0.5 meter grid of the SCPI was resampled to 28.5 meters (Figures 22 & 23). The general representation of the location of forest from the CEO 89 TM classification is in agreement with the 1989 SCPI, but the connectedness seems to be overestimated by the TM product and this is further substantiated by the doubling of the PPU values from CEO 89 TM (7.2) to 1989 SCPI (14.6) (Figures 20 & 21; Table 10). ...