a. Outline nonforest areas such as water, 

 farm land, and residential areas. These 

 categories are obvious and require little 

 or no use of a stereoscope. 



b. Delineate nonproductive forest areas. 

 These are forested rocky areas, grassy 

 swamp land, brush land or forested 

 areas badly depleted by repeated fires. 



c. Sketch forest plantation boundaries. Old 

 plantings are readily recognized. New 

 ones less than 5 years old when the aerial 

 photographs were taken, can be deter- 

 mined only by field reconnaissance cod- 

 ings or from ownership records. 



d. The remaining areas are productive for- 

 est lands. 



9. See Appendix A for a chronological proc- 

 ess of classifying land on aerial photographs. 



10. See Appendix B for type site, stand-size 

 class and volume per acre class definitions. 



11. Stereograms: 



a. A set of aerial stereograms are attached 

 as Appendix C. 



b. A set of ground stereograms are at- 

 tached as Appendix D. 



c. By using a stereoscope it can be magni- 

 fied and viewed in three dimensions. By 

 comparing the stereo pairs with photo- 

 graphs the interpreter will be guided in 

 recognizing various stand conditions. 



12. Aerial photos general: 



a. The quality of aerial photographs will 

 vary somewhat from county to county, 

 because of film, photography, time of 

 day, atmospheric conditions and seasons 

 of photography. 



b. Summer panchromatic film may be use- 

 less for forestry because of lack of con- 

 trast between pine and hardwood. 



13. Once again, constant field checking is re- 

 quired of a good photo interpreter. 



APPENDIX B. DEFINITION OF TERMS 

 1. Forest Sites: 



a. Site is determined by number of 16-foot 

 logs contained in each mature dominant or co- 

 dominant tree. Mature trees to be recognized 

 in the survey should be pine with diameters 

 of at least 20 inches DBH and hardwood 16 

 inches DBH. 



b. Number of 16 foot logs by site and type. 

 Forest site Pine Hardwood 



I at least 5 at least 3 



II 3 to 41/2 2 or 21/2 



III less than 3 less than 2 



c. For areas where mature trees are not pres- 

 ent, site is determined by comparing the heights 

 and forms of the immature trees with heights 

 and forms of immature trees found in mature 

 stands of known site quality in similar loca- 

 tions. 



2. Merchantable Tree Dimensions: 



a. Minimum saw timber size trees : 



(1) Pine— 10 inches DBH 



(2) Hardwood— 12 inches DBH 



b. Minimum pulp or pole size trees : 



(1) Pine— 5 inches DBH 



(2) Hardwood— 5 inches DBH 



c. Minimum top diameters: 



(1) Pine — 8 inches 



(2) Hardwood — 12 inches 



3. Stand Size Class: 



a. Saw timber minimum stands : 



(1) Pine — 1,000 board feet per acre 



(2) Hardwood — 800 board feet per acre 



b. Pulpwood minimum stands: 



(1) Pine— 2 cords but less than 1,000 

 board feet per acre 



(2) Hardwood — 2 cords or pole timber 

 with at least 12 X 12 feet spacing, and 

 less than 800 board feet of saw timber 



c. Reproduction: 



(1) Seedlings and sapling stands less than 

 5 inches DBH 



4. Gross volume per acre classes : 



a. Reproduction, seedlings and saplings: 



(1) Poor stand, less than 500 stems per 

 acre 



(2) Average stand, 500-1,000 stems per 

 acre 



(3) Good stand, 1,000 or more stems per 

 acre 



b. Pulpwood: 



( 1 ) Light, 1-3 cords per acre 



(2) Medium, 3-6 cords per acre 



(3) Heavy, 6-10 cords per acre 



c. Saw-timber: 



(1) Light, 1-3 M per acre 



(2) Medium, 3-6 M per acre 



(3) Heavy, 6-10 M per acre 



5. Cull: 



a. Cull volume: Amount of wood unmer- 

 chantable because of decay or defects. Includes 

 top sections of trees to merchantable limits 

 usually left in woods because of many limbs or 

 excessive crook. 



