. A primer on stand and forest inventory designs. Forests and forestry Mensuration; Forest surveys. Figure 13 illustrates the use of cells. Each field plot has an area expansion factor (EF) where: EF - A/n (12) The expansion factor for the plots established in this sample design is: EF - 15,300/20 = 765 acres per plot. The 765 acres surrounding each plot center are character- ized as the same as the plot itself. Because the plots in the example above were established using a grid of equilateral triangles, the cells take on the form of hexagons. Areas outside the plot locations are assumed to h
. A primer on stand and forest inventory designs. Forests and forestry Mensuration; Forest surveys. Figure 13 illustrates the use of cells. Each field plot has an area expansion factor (EF) where: EF - A/n (12) The expansion factor for the plots established in this sample design is: EF - 15,300/20 = 765 acres per plot. The 765 acres surrounding each plot center are character- ized as the same as the plot itself. Because the plots in the example above were established using a grid of equilateral triangles, the cells take on the form of hexagons. Areas outside the plot locations are assumed to have the average characteristics of the Forest as a whole. Thus those areas are assumed to have ccf per acre. Mapping suitable red-spotted snail eater habitat is a challenging task. The presence or absence of indicators of habitat even in sampled stands may not represent the proportion of the area actually utilized. Because the sampling fraction is quite small it may be most informative simply to associate the estimated proportion with each stand instead of indicating the presence or absence of habitat for the sampled stands. An alternative is to employ an advanced multivariate classification procedure to the sampled stands and predict presence or absence based on these findings. Forest Boundary 0 FEET 5000 N a. a Figure 13—Mapping showing measured (*) and Forest average (a) volume (ccf) per acre based on a systematic sample. Each hexagon represents 765 acres. O Conifer ? Hardwood ? Brush/Open O Field Plot 34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lund, H. Gyde; Thomas, Charles E. (Charles Eugene), 1940-; United States. Forest Service. [Washington, D. C. ?] : U. S. Dept. of Agriculture, Forest Service
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