First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of photogrammetry. It explains what photogrammetry is without needing any other context. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "The process" which needs context. Paragraph 3 starts with "Now the same technology" which also needs prior information. Paragraph 4 starts with "Photogrammetry lets" which assumes knowledge of photogrammetry.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about photogrammetry. It shows the final benefit of the technology. This follows the rule of Conclusive Words, as it gives a clear ending to the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of photogrammetry. It uses the Connector strategy by starting with "The process" which refers back to photogrammetry.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows how the same technology is used in a different area. This follows the Logical Order strategy as it shows a progression from one use of technology to another.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains the benefit of using photogrammetry for the artefacts. This follows the Cause and Effect Relationship strategy, where the use of technology leads to the benefit of seeing artefacts in detail.