1. Stadia Theory
SURVEY2

2. Stadia is a tacheometric form of distance measurement that relies on a fixed-angle intercept while tacheometry is the procedure by which horizontal distances and difference in elevations are determined indirectly using subtended intervals and angles observed with a transit or theodolite on a graduated rod or scale.

3. Two Types of Observation
Horizontal Sights
Inclined Sights

4. The Stadia Method for Horizontal Sights
where:

5. From the previous figure,

6. Example: HORIZONTAL SIGHTS

7. Solution:

8. Inclined Stadia Sights

9. Enhanced Projection on the Rod

13. Example: INCLINED SIGHTS