Spatial Reference - Information about Intersections

An Intersection is the calculation for the co-ordinates of a point that is obtained by mathematically intersecting two directional rays from their respective points.

The precision of the point fixed by the intersection depends on the quality of the observations to the point and tends to be more accurate as the intersection angle of the two rays tend to 90° (perpendicular). The reason for this is that if the intersection angle is very small (close to 0°) or very big (close to 180°), then a small error in the direction observation will translate into a large shift in position.

This is explained geometrically below:

Generally, it is good practise to choose points in such a way that the intersection angle lies between 30° and 150° where possible.

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