Recording Materials 
The standard film for topographic mapping remains Kodak type 2405 Aerographic Double X, usually com- 
bined with a 500 nm filter. Common color films are Aerochrome Infrared type 2443 and Aerocolor 
Negative type 2445. Some 8 othe black and white films and some 10 other color films are also used. 
Thermal infra-red is recorded on chart paper or magnetic tape, and T.V. imagery on magnetic tape. 
Processing 
Almost all film processing is in continuous processing machines with close chemical and sensitometric 
control. Thermal infra-red data originally recorded on magnetic tape may be converted to a film 
image in any of several modes for relating termperature to photographic density. 
Image Location 
chaired by Dr. H. Ziemann of the National Research Council, will be reported in detail elswehere. 
The Canadian Forest Service have studied distortions due to focal plane shutters in forestry use”. 
study has been made of the effectiveness of representing image distortions by two types of polynomials 
with various numbers of terms!3» 
The comparison of various methods of camera calibration by the ISP Working Group on Image Geometry, e L 
A 
Image Quality 
Further measurements of camera vibration have confirmed that it is often, directly or indirectly, a 
limiting factor in image sharpness . A study of visual factors in viewing photography has established 
relationships between viewing magnification and the resolution actually achieved by an observer*. 
Space Photograph 
The Canadian Centre for Remote Sensing displayed the first imagery they acquired from ERTS-1 during 
the July 1972 ISP Congress in Ottawa. Since then steadily increasing use has been made of their 
acquisition, reproduction, and distribution facilities. To 31 January 1976, about 34,000 photographic 
products have been sold to an estimated 3,000 users. 
The U.S.A. satellites, now Landsat 1 and Landsat 2, carry three return beam vidicon (RBV) television 
cameras with the following spectral coverages: Band 1 0,475-01575 um; Band 2 0.580-0.680 um ; 
Band 3 0.698-0.830 um ; and a multispectral scanner (MSS) with Band 4 0.50-0.60 um ; Band 5 0.60-0.70 
um ; Band 6 0.70-0.80 um ; and Band 7 0.80-1.10 um. Field of view of the RBV is 185 x 185 km. Swath 
width for the MSS is 185 km. For each, the spatial resolution at nadir (instantaneous field of view) e € 
is about 80 m. 
Image data are received in Canada at the Prince Albert Satellite Station (PASS) in Saskatchewan and 
recorded on magnetic tape. '"Quick look" photographic imagery on 70 mm film is available in two or three 
days. More sophisticated imagery prepared in Ottawa requires about 4 weeks. For it, geometric and 
radiometric corrections are applied and the framing of MSS data made coincident with RBV data. Imagery 
is produced on 70 mm film by an electron beam recorder (EBR), and may be printed or enlarged by a 
precision enlarger which can produce color composite images. Computer compatible tapes (CCT) of the 
MSS imagery are also available. 
Thermal I-R imagery from the NOAA (National Oceonographic and Space Administration, U.S.A.) weather 
satellites is also received at PASS. 
A list of publications is available from Canada Centre for Remote Sensing, Technical Information 
Service, 717 Belfast Road, Ottawa, Canada KIA OE4 
PUBLISHED WORKS 
1. Carman, P.D., "Camera Vibration Measurements', Canadian Surveyor 27, 3, p. 208, Sept. 1973. 
2. Nielsen, U., "A New System for Recording Aircraft Attitude', Canadian Aeronautics and Space 
Journal 19, 10, ;.. 525, Dec. 1973. 
3. Nielsen, U., "Large Scale Photography Applied to Forest Inventories", First Panamerican & Third 
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