. A primer on stand and forest inventory designs. Forests and forestry Mensuration; Forest surveys. Mapping and Unmeasured Area Estimates—The sat- ellite scene also serves as a rough map of the resources. Areas classified and mapped as having low density, for example, can be assumed to be hardwood vegetation 78 percent of the time and have a volume of ccf per acre ± percent based upon the field survey. Pixels containing the field plots may be assigned the measured values. All other pixels are assigned the stratum averages. See figure 22. Note that both sampled volumes and stratum a
. A primer on stand and forest inventory designs. Forests and forestry Mensuration; Forest surveys. Mapping and Unmeasured Area Estimates—The sat- ellite scene also serves as a rough map of the resources. Areas classified and mapped as having low density, for example, can be assumed to be hardwood vegetation 78 percent of the time and have a volume of ccf per acre ± percent based upon the field survey. Pixels containing the field plots may be assigned the measured values. All other pixels are assigned the stratum averages. See figure 22. Note that both sampled volumes and stratum averages are shown. In actual practice, only stratum averages are usually displayed in the mapping process. In such in- stances, resource managers need to be aware of the source of the information displayed and the associated sampling errors. Cost Estimates—The cost estimates include costs incurred from purchases, interpretation of imagery, and field activities. Field costs = $2,275 Imagery of Forest = 61 Interpretation of Forest = 382 Mapping 306 Total costs = $3,024, or $0,198 per acre. Forest Boundary ' 0 FEET 5000. Figure 22—Mapping showing measured (*) and stratum average Is) volume (ccf) per acre based on the stratified satellite imagery sample. Each pixel represents 15 acres. 52. 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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