ADDITION OF GRIDS TO ALL PHOTOGRAPHY

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001700080004-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: July 16, 2001
• Sequence Number: 4
• Publication Date: August 18, 1961
• Content Type: MF

Approved For Release 2001/08/13 : CIA-RDP78B04747A001700080004-2
DECLASS REVIEW by NIMA/DOD
MEMORANDUM FOR: Chief, TP&DS
FROM: Acting Chief, TISD
SUBJECT: Addition of Grids to all Photography
18 August 1961
1. The addition of a grid applied to the photography at the
processing site would result in uniformity throughout all copies of
the material produced. There are certain factors that should be con-
sidered in adopting such a grid.
A. Origin of the Grid: The origin of the grid should be
such that no negative values are encountered. Preferably, origin is
similar to a grid now in use with current photography; namely, the lower
left corner of the format when the photography is oriented such that the
direction of flight is directly away from the viewer.
B. Orientation of the Grid: Orientation, in addition to that
mentioned in A above, should be such that the X axis is left to right and
the Y axis near to far side, or bottom to top if viewed similarly to the
way a person would view a map. The grid should be oriented parallel to
the axis of the forma ,~hand where the format is rotated with respect to
the line of flight, the orientation should be in agreement with the yaw
or swing of the format.
C. Labeling of Units: Numbers rather than letters should be
used for both axes. The use of numbers is more adaptable to all formats,
present and future, regardless of their size; whereas, letters may re-
quire the use of a double alphabet when the format is greater than 26
centimeters (approximately 10 inches). Also, numbers are more readily
adaptable to subdivision which is almost certain to be necessary as
resolution improves and greater magnification is necessary. Numbers
are more readily adaptable to use in relation to computer operations
which will utilize the grids. Numbers should represent the grid lines
rather than the space between the adjacent lines.
D. Whatever grid is adopted should be uniform for all
photographic systems.
E. Selection of Ticks: In the selection of ticks, considera-
tion should be given to the possible use of electronic means to auto-
matically count ticks and locate positions on the photography by means
of the peripheral grid ticks. Possibly, some experimentation may be
necessary to select or design ticks most suitable for this type readout.
Approved For Release 2001/08/13 : CIA-RDP78B04747A001700080004-2
 Approved For Release 2001/08/13 : CIA-RDP78BO4747AO01700080004-2
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2. A question has been raised regarding the ability to accurately
and uniformly register the grid to the format of the photography. For
PI target location purposes registry may not be of prime importance;
however, use of the grid in precision measuring instruments for reference
purposes may be a serious problem if accurate registry is not maintained.
Approved For Release 2001/08/13 : CIA-RDP78BO4747AO01700080004-2