1, magnetic north line: On the map of 1: 15000, the distance between magnetic north lines is 33.33 mm, that is to say, the field distance is 500 meters. On maps of other scales, the distance between magnetic north lines should be the distance representing the field distance of an integer (for example, 50m, 100m, 250m, 500m). Cover small features, such as stones, hills, intersections of cliffs and streams, and the end of roads.
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Position, the magnetic north line can be disconnected. In areas where there is basically no water feature, the magnetic north line can be represented by the blue line.
2. Overprint marks: At least three overprint marks must be arranged in the asymmetric position of Tu Tu contour.
3. Elevation point: Elevation point is used to roughly interpret the height difference. The elevation is in meters, and the digital prefix points to the north. There are no black spots at the elevation point of water surface.
Second, overprint symbols
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1. Starting point: The starting point or map publishing point (when the map publishing point is not at the starting point) is represented by an equilateral triangle, with one angle pointing to the first checkpoint. The geometric center of a triangle is the exact location of the starting point.
2. Checkpoints: Checkpoints are indicated by circles. The center of the circle is the exact location of the checkpoint feature. The checkpoint circle covers the important details of the parts with arc removed.
3. Checkpoint serial number: Checkpoint serial number is located in the circle near the checkpoint and will not be overwritten.
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Where important details are covered, the number prefix faces north.
4. Connection: according to the order of checkpoint access, connect the starting point, checkpoint and end point with line segments. Line segments covering important details should be deleted.
5. Mark the route: The marked route is indicated by a dotted line on the map.
6. End point: The end point is represented by two concentric circles.
7. impassable boundary: the boundary that is not allowed to pass.
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8. Passing point: The passage crossing or over fences, roads and railways, or tunnels and restricted areas is represented on the map by a pair of arcs with both ends bent outward.
9. Temporary restricted areas:
Restricted areas are indicated by vertical lines. In the absence of natural boundaries, boundary lines can be drawn according to the following rules:
The solid line indicates that there is a continuous