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object height surveying trigonometry Calculation Example # Calculation example - Calculate the height of an object when its base is inaccessible

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**Calculate the height of an object from a baseline when its projected position to the ground is inaccessible. Case scenario when baseline AB is level and collinear with object.**

**Known values:** Baseline distance ** AB** length, height

**Solution:** Height of object above ground at position ** A**.

First, measure horizontal distance ** AB** and vertical angles

Then calculate vertical distance** OC_{1}:**

Thus:

Finally, calculate height of object above ground at station A:

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