Once the complete domain has been scanned, a list of trees is generated from all blobs with this maximum score. The threshold value is then lowered by one, the blob-mask reset to zero, and the process begins again. This is the file which is the input data source for ArcView. Coordinate transformation between real world and pixel coordinates is achieved by reference to the TIFF image World File, which must be present. Automatic identification of the rectangle which bounds an irregular parcel polygon.
Dialogue boxes for the entry of the parameters used by the algorithm.
Storage of counts as an attribute of parcel polygons, and committing results to a master database. These functions are best illustrated by looking at some typical examples in the sections below. Upon loading of a selected parcel theme, fields are automatically added to store the total count of trees for that parcel. The operator has to select a field which uniquely identifies individual parcels. Any images which are loaded automatically have a footprint theme created, i.e. a rectangular polygon for each image which defines the geographic extent.