. Aerial photo techniques for a recreation inventory of mountain lakes and streams. National parks and reserves; Natural resources United States. Lake Size Description by class. - -Lakes of different sizes have different possibilities for recreational use. Therefore classification according to surface area is recommended. The following five classes have been found useful for mountain lakes: Class l--less than 1 acre -. Class to acres Class to acres Class to acres Class 5--20 acres or more The size class of a lake can be estimated directly on a photo by
. Aerial photo techniques for a recreation inventory of mountain lakes and streams. National parks and reserves; Natural resources United States. Lake Size Description by class. - -Lakes of different sizes have different possibilities for recreational use. Therefore classification according to surface area is recommended. The following five classes have been found useful for mountain lakes: Class l--less than 1 acre -. Class to acres Class to acres Class to acres Class 5--20 acres or more The size class of a lake can be estimated directly on a photo by means of a lake size guide, a-transparent overlay printed with concentric circles that correspond to the lake size classes at the average scale of the photos being examined. By placing the guide over a lake image on a photo, the interpreter can rapidly select the size class most nearly matching the lake surface area. It should be remembered that division of lakes into general size classes with the guide is merely an approximation of acreage. The acreage of a long, narrow lake, for example, cannot be accurately measured with a circular guide, but a reasonable estimate can be quickly made. Description by acreage. - -When it is deemed necessary to describe lake size more pre- cisely than by classes, each lake image can be measured with a dot grid. This grid is a trans- parent overlay covered with equally spaced dots, each of which represents the center of a small square. For most lake measurements, a dot grid having 256 dots per square inch is adequate. Where added precision is desired, a microdot grid having 1,024 dots per square inch can be used. 7. 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 Herrington, Roscoe Burwell; Tocher, S. Ross (Stewart Ross); Intermountain Forest and Range Experiment Station (Ogd
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Keywords: ., bookcentury1900, bookcollec, booksubjectnationalparksandreserves
