## CIVIL-SURVEY applications

#### Calculate elevations at any random point along a vertical curve. View curve in graph window. Increase vertical scale with "Y to X" ratio Set Y to X ratio to 0 to hide graph window. Use station increment / decrement buttons to conveniently move up or down station.

#### Calculate elevations at quarter points and elevations at any random point along a circular arc projected on a plane. Automatically solves for curve and plane elements. Good for those cities and agencies that require planar curb return designs.

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#### Derivation and math behind vertical curves.

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#### Derivation and math behind the planar method.

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#### Calculate a least squares fitted line from a text file of coordinates you place on your device's storage. The least squares fit minimizes the sum of the squares of the perpendicular distances from each point to the line.

#### Calculate a least squares fitted arc from a text file of coordinates you place on your device's storage. The least squares fit is achieved by finding center coordinates h, k, and radius r that minimizes the following sum: