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Aerial Photography In India

BRIEF HISTORY:

The first recorded aerial photography in India was flown in 1927 on a scale 4" mile. Since then, over the years, nearly the entire country has been aerially photographed on various scales. Of late, developments in the disciplines of Photogrammetry and Remote Sensing and specially of Photo-interpretation in the country, have given impetus to the requirements for aerial photography, and this has consequently led to need for quality control necessitating use of special material and processes.

TYPES OF AERIAL PHOTOGRAPHS:

• PANCHROMATIC (BLACK & WHITE) PHOTOGRAPH
 
• INFRA-RED (BLACK & WHITE) PHOTOGRAPH
 
• COLOUR PHOTOGRAPH
 
• COLOUR INFRA-RED (FALSE/COLOUR) PHOTOGRAPH
 
• MULTISPECTRAL PHOTOGRAPH
 
• SATELLITE IMAGERIES

DEMAND FOR REPRINTS:

• Most of the requirements of aerial photography can be met from the existing photographic coverage.
 
• Contact prints are available in sizes 18cm x 18cm(7"x7") or 23cm x 23cm (9"x9"), depending upon the camera used.
 
• Enlargement can be prepared up to 5 times depending upon the availability of large sized paper and the quality of the original negative. Simple enlargements can be done straightway from the aerial negatives, but for rectified prints, ground control data is required and as such it is costlier and time consuming.
 
• Mosaics- un-annotated, uncontrolled, semi-controlled and controlled mosaics on masonite board or fabric base preferably on sizes 2 1/2'x2' or 6'x4' can be supplied on same or enlarged scale. Controlled mosaics are produced by mosaicing the rectified prints.
 
• Diapositives on contact scale, can be prepared and supplied for photogrammetric or interpretation use.
 
• Orthophoto Maps on contact or enlarged scale can be supplied.

HOW TO INDENT FOR REPRINTS:

• Mark the limits of the area of interest on a 1/4"-1 mile or 1:250,000 scale topographical map or an index on tracing paper prepared on such a map base.
 
• Give complete details, address, telephone number and status i.e. Central/State Government/ Autonomous bodies/Educational Institution/private etc. of the Indenting person/Organisation.
 

Give details as follows:

• Purpose for which aerial photographs are required.
 
• Type of photography (para 1.2 above refers).
 
• Scale on which aerial photographs are required.
 
• Is the coverage required stereoscopic or non-stereoscopic? If non-stereoscopic, only alternate photograph along a line where 60 percent forward overlap has been used, needs to be procured.
 
• Details of contact prints/enlargements, mosaic/ dia-positive, orthophoto-maps, etc., required. 
• Send the above data documents to In-charge, Marketing Wing, Survey(Air) and Delhi Geo Sptial Data Centre.
  Form 0.57 (Photo)* of the Survey of India duly completed and countersigned by the appropriate authority as defined in the form itself and sent to In-charge, Marketing Wing, Survey(Air) and Delhi Geo Sptial Data Centre. In the case of controlled photo mosaic, rectified enlargements, orthophoto maps and any mapping with the help of aerial photographs the demand may be routed through the concerned regional circle/Directorate of Survey of India.

   

Note:

1. On receipt of the complete data/documents about the requirement of reprints / aerial  photography, security clearance from the Ministry of Defence, etc. will be processed and intimation if whole or part of the demand can be supplied, will be intimated to the indenter and the details of payment settled.
 
2. Payment will be made in advance by Crossed Bank Draft  drawn in favour of the "Sr. Accounts Officer, Central Pay and Accounts Office, Survey of India", Surveyor General's Office, Dehradun-248001 (Uttarakhand).  This is subject to final adjustment on receipt of bill for actual expenditure.
 
3. On receipt of the photographs in the month of January every year a 'Certificate of safe custody'  (Proforma for this will be supplied while issuing the print order by In-charge, Marketing Wing, Survey(Air) and Delhi Geo Sptial Data Centre has to be submitted to In-charge, Marketing Wing, Survey(Air) and Delhi Geo Sptial Data Centre, under intimation to the Surveyor General of India, Dehra Dun (Uttarakhand).

 

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