. Planning single-span skylines. Logging, Skyline. Topography is the principal contribu- ting factor to obtaining adequate deflec- tion. In addition to topography, other consid- erations for selecting areas are: the trans- portation plan, log landings, skyline anchors, spar trees, and overall costs of operation. SUITABLE TERRAIN Three types of forested terrain confront the skyline planner: concave, uniform, and convex slopes. Single-span skylines are best suited to concave topography since this condition presents the least problem in obtaining adequate deflection. A concave slope with a
. Planning single-span skylines. Logging, Skyline. Topography is the principal contribu- ting factor to obtaining adequate deflec- tion. In addition to topography, other consid- erations for selecting areas are: the trans- portation plan, log landings, skyline anchors, spar trees, and overall costs of operation. SUITABLE TERRAIN Three types of forested terrain confront the skyline planner: concave, uniform, and convex slopes. Single-span skylines are best suited to concave topography since this condition presents the least problem in obtaining adequate deflection. A concave slope with a single-span sky- line is illustrated in figure A CONSTANT SLOPE WITH THE SKYLINE ANCHORED ON OPPOSITE HILLSIDE TO PROVIDE 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 Binkley, Virgil Wayne; Lysons, Hilton H. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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