Prismatic & Surveyor Compass

4. Control Survey 4.1. Compass Survey introduction 4.1.1. Magnet and its Properties 4.1.2. Types of Compass 4.1.3. Meridians and Bearing 4.1.4. Types of Bearing 4.1.5. Measurement of Bearing 4.1.6. Correction to Magnetic Bearing 4.1.7. Observation and Plotting 4.2. Traverse and Triangulation 4.2.1. Introduction 4.2.2. Principles 4.2.3. Importance and Use 4.2.4. Classification 4.2.5. Reconnaissance and Monumentation 4.2.6. Observation and Field Check 4.2.7. Preparation of Traverse/Triangulation Chart 4.2.8. Computation and Adjustment 4.2.9. Description Card (D-Card) – Importance and Use 4.2.10. Signaling 4.2.11. Triangulation Figure 4.2.12. Resection and Triangle Closing in Triangulation 4.3. GNSS 4.3.1. Different Types of GNSS – GPS, GLONASS, BeiDou, Galileo, QZSS, NavIC 4.3.2. Principle & Application of GNSS 4.3.3. Space Segment, Control Segment and User Segment 4.3.4. Description Card (D-Card) – Importance and Use 4.4. Levelling 4.4.1. Introduction 4.4.2. Principle 4.4.3. Types of Levelling 4.4.4. Mean Sea Level Data [MSL Data] 4.4.5. Bench Mark 4.4.6. Reduced Level 4.4.7. Relative Height 4.4.8. Field Procedure Reduction of Level 4.4.9. Rise and Fall Method 4.4.10. Height of Instrument Method 4.4.11. Sources of Error Precautions of Levelling 4.4.12. Computation and Adjustment 4.4.13. Description Card (D-Card) – Importance and Use