Prospective land survey

sketch from life or from a photo of the terrain with the designation of the most characteristic points (elements) of the landscape. The resulting perspective view of the landscape (the scheme) is used to route and subsequent orientation on the ground during the campaign.

                  A sketch of the area from life starts with "binding" of the future scheme to his subject area. For this visually eye-level outline skyline and Ch. vertical (so that they pass through specific guidelines, for example. single bush or tree on the slope, a rocky ledge of unusual shape, the avalanche cone) and put them on a sheet of paper (see Figure). Then the scheme is applied to all DOS. guidelines in accordance with their relative position and attributes. distance from the horizon line and Ch. vertical. Rel. distance between features measured with a pencil or a ruler. Knowing the length of the arm, the size of a pencil and a reference sample size (as defined on the basis of visual comparison with the objects, the size of to-ryh known), we can calculate the distance to this guide. For the calculations, we can take: man's height of 1.75 m, the height of the column link 5 — 7 m, one-story house 7 — 8 m, middle of the forest 18 — 20 m, the length of the truck 5 — 6 m area between landmarks depicted on the eye, something like paint a landscape, but more sketchy. Sometimes to clarify guidelines for the scheme is applied in the form of conventional icons: the circuit can also be accompanied by explanations and preliminary. estimates of the way, descriptions of dangerous places, etc.

                  Perspective on terrain photograph redrawn on tracing paper or on paper (with a light table). DOS. landmarks that are visible on the photograph, the scheme usually distinguish, for example. thickened or stroke color, not visible in the photo, but the famous landmarks is applied to the circuit symbols, sometimes accompanying them with inscriptions.

                  P. s. m has a number of advantages: the result of shooting — the scheme area — can be used immediately after the shooting, when shooting can be allocated for the scheme the most important elements (pixels) of the landscape, omitting inessential for route details, the method allows the application to the circuit area landmarks not visible from the camera angle (or in the photo), but known to those who will be recording. See also The visual shooting.

ADVANCED SHOOTING AREA

Prospective survey area: a — picture of the terrain, b — schematic representation of the site, restored to photograph, showing major landmarks dotted line indicates the route)

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