Question

why did the British preserve official document ? why did they undertake surveying and mapping on a large area

Answer 1

Answer:

British preserved official documents so that things could be properly studied and debated. these were called archives. Survey of India publishes maps and the unrestricted category maps can be obtained at very reasonable prices from its several Geo-spatial data centers.

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Answer 2

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British had preserved official documents, because they thought if they write and record everything, it will later be easier for them to study them and debate. They kept official records of what they thought was right, so that in the future, those records can serve as proofs of all the decisions that they had taken.