10-36-80/5(DCEP)
Victoria Island, Ontario
1 August 1961
Mr S G Gamble,
Director
Surveys and Mapping Branch
Dept of Mines and Technical Surveys
Ottawa, Ontario
Re: Strip Topographical Maps
Gap Filler Radar Programme
Dear Sir:
In connection with the Gap Filler Radar Programme, which extends from the Manitoba border to the Atlantic coast, we have made good use of the available 1:50,000 topographical maps in the various forms for the locating of the proposed radar stations, determining the probable radar coverage, designing the site layout, access roads, power lines and communication routes.
We have naturally run into difficulty in areas in Northern Ontario and Quebec where 1:50,000 or 1:40,000 maps are not yet available. In this connection we have four sites where the communication to the prime radar station will have to be partly by radio rather than land lines but whether this method is possible cannot be determined without some idea of the terrain between the site and the nearest telephone exchange. A strip map covering three miles wide on a scale of 1:50,000 with 50 ft contours, with particular emphasis to the high points rather than the low areas, would provide us with the information we require.
The area involved are shown on the attached photostats where, we believe, there is sufficient horizontal and vertical control for the accuracy required for our engineering study:
Yours truly,
(JW Griffith)
for Chief of the Air Staff