**The geometry of resections matters!**

You may have experienced this before. You are defining a new station and all points with known coordinates (back sights) are more or less in the same direction. Be careful in this situation.

**The situation explained with an example:**

Resection on point 1 with observations to known back sights on the road north of the site (green in following figure). Goal is to find the coordinates of point 5.

**Accuracy (blue error ellipse in map):**

Standard deviation is very bad 107 mm.

A bigger angle between the back sights will help achieve a better accuracy of the coordinates of point 5. Thus, if possible, use different known points to improve your results – as shown in the following example.

**Accuracy (blue error ellipse in map):**

Standard deviation is considerable improved (37mm compared to 107mm before) through the use of backsight points with a larger angle between them(notice that standard deviation of known points is set to 35mm)

Check your resection with BestTachySpot.

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