4.14.1. Block Triangulation

Try these first

1. 1.

   Define Ground Control Points (GCPs).

   Hint

   Think about why we need reference points.

2. 2.

   What is a Principal Point?

   Hint

   Consider the importance of a center in geometry.

3. 3.

   What does GCP stand for?

   • Ground Control Point
   • Geographic Control Point
   • Global Control Point

   Hint

   Think about the role of control points.

4. 4.

   True or false: Block triangulation is less accurate than radial triangulation.

   • True
   • False

   Hint

   Consider the advantages of each method.

5. 5.

   Discuss the potential errors that might arise if GCPs are inaccurately selected.

   Hint

   Reflect on how positioning affects measurements.

6. 6.

   Calculate the number of photographs needed to cover an area of 50 km² using a 30% overlap with a standard photo size of 23 cm x 23 cm.

   Hint

   Consider calculating photo coverage with overlaps.