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RATINGS FORTRACTS DETERMINED <br />BY PROPERTY BOUNDARIES <br />T he preceding sections have applied these <br />ratings to tracts of forest. Usually these tracts <br />do not correspond to property boundaries, but <br />no special problems arise in applying the IR and <br />CR to parcels defined by property boundaries. A <br />parcel of land would usually include several <br />different tracts of forest or parts of tracts. To <br />i <br />calculate an Intrinsic Rating for the entire parcel, <br />we could recompute areas (GIS polygons) by <br />using both the boundaries of forest tracts and the <br />property boundaries in question. <br />Then we could find the IR for each polygon <br />included within the property boundaries and <br />sum them to obtain a total IR for the property. <br />To obtain the Contextual Rating for the proper- <br />ty, we could then follow the procedures described <br />previously without modification. The Total <br />Rating for the property would equal the product <br />of IR and (1 + CR), as described above. <br />Table 3 <br />STATISTICS FOR RATINGS OF FOREST FOR WILDLIFE <br />YEAR 1988* <br />INTRINSIC RATINGS <br />Median (50th percentile) 803 <br />Maximum 48260 <br />Overall Sum 941,547 <br />Number of tracts over 15,000 7 <br />1999** <br />713 <br />40510 <br />789,077 <br />5 <br />CONTEXTUAL RATINGS <br />Median (50th percentile) 22.3 25.6 <br />Maximum 147 145 <br />`., TOTAL RATINGS <br />Median (50th percentile) 19045 14788 <br />Maximum 1,385,000 1,098,000 <br />Overall Sum 30,129,000 23,273,000 <br />Number of tracts over 300,000 14 12 <br />*Based on 1988 Aerial Photographs (689 tracts of forest over 40 acres) <br />**After subtracting properties with building permits issued 1988 -1998 (653 remaining tracts of forest over 40 acres) <br />IS <br />