The correct sequence of surveying operations is as follows:
- Reconnaissance: This is the first step, where the survey area is studied to understand the conditions.
- Field observations: Once reconnaissance is done, field data is collected based on the study.
- Data analysis: After gathering data, it is analyzed to interpret the measurements and findings.
- Map making: Finally, the analyzed data is used to create maps.
Thus, the correct sequence is: Reconnaissance \( \rightarrow \) Field observations \( \rightarrow \) Data analysis \( \rightarrow \) Map making.
Final Answer: Reconnaissance \( \rightarrow \) Field observations \( \rightarrow \) Data analysis \( \rightarrow \) Map making