AERIAL MAPPING.

Ashburton Guardian, Volume XLV, Issue 10163, 18 July 1924, Page 5

AERIAL MAPPING.

NEW YORK HAS ITS PICTURE TAKEN. New York has had its picture taken. Photographers are now busily engaged natcSne up 2000 negatives that, when ffi will be a photo 27 feet long and SO -feet wide, ft was made from the air for the City Administration by H f airchild Aerial Cinema Corpora; tion says the "New York Times.' TheVcture will be ready in the spring. It mU show every structure in New York from the contractor's temporary fool shed to the sky-craper, backyards earoens and parks with every tree frfd Sh visible, avenues and alleys streets and unrecorded footpaths, big Sue ball parks, waterfront clubs with their yachts and motor-boats, and the broad-walk of Coney Island wit crowds of people appearing like small dote. Even the congestion or traffic

on busy thoroughfares is clearly, shown. It is by far the greatest mapping orofect ever undertaken. Three thousand miles were flown in the mapping of the greater city of approximately Wo squafe miles. The work was tedious and trying, for all prints with clouds or cloud shadows were deemed unht. The work for the map was done at 16,000 feet altitude in a Fokker plane too high to be seen , with the naked eye. A scale of one inch to 2000 feet is used. It is interesting to note that the 2000 exposures necessary to cover the entire area with an allowance_ot 50 per cent, overlap, when matched

together would make a single strip map over 8000 miles long. Such a map if in one section at a scale ot one inch to 600 feet, giving effect to . the overlap of 50 per cent, would he 1 nearly 600 feet long. If New York > likes its picture, other cities througii- » out the country expect to have theirs 1 taken too.