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How are aerial pictures used to make topographic maps? - Druckversion

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How are aerial pictures used to make topographic maps? - Dennison - 30.06.2018

1) How are aerial pictures used to make topographic maps? 
2) How do US Geological Survey verify what aerial photographs show? 

(Answer in this form please: 
1)BLAH 
2)BLAH 
Replace BLAH with your answer) XD

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ndvi mapping in East Anglia