MIL-PRF-89041 Controlled Image Base \(Cib\)This specification provides requirements for the preparation and use of the Raster Product Format \(RPF\) Controlled Image Base \(CIB\) data. CIB is a dataset of orthophotos, made from rectified grayscale aerial images. CIB supports various weapons, C3I theater battle management, mission planning, digital moving map, terrain analysis, simulation, and intelligence systems. CIB data are produced from digital source images that can be converted to meet the requirements of this CIB specification at one of the registered resolutions defined in MIL-STD-2411-1. CIB data are derived directly from digital images and are compressed and reformatted to conform to the RPF Standard. CIB files are physically formatted within a National Imagery Transmission Format \(NITF\) message.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10

MIL-PRF-89041A

c. The APPENDIX, Section A.5, lists the number of frame and

subframe rows and columns in each zone for the latitudinal and

longitudinal directions, east-west pixel spacing constants (i.e.,

the number of pixels for 360� longitude), and the north-south

pixel spacing constants (i.e., number of pixels contained in 90�

from equator to pole) for several example CIB resolutions.

3.5.3

Numbering and origin conventions.

a. The numbering convention shall conform to MIL-STD-2411.

All index numbers for pixels within a subframe, subframes within

a frame and frames within a zone shall start from 0. Rows and

columns of subframes in a frame, pixels, and indices in [frame

file] components shall be counted from 0. The origin for the

subframe and pixel numbering within frames and subframes shall be

from the upper left corner. Subframes and pixels shall be

counted in row-major order from the origin. The APPENDIX

provides a set of coordinate conversions between row/column

coordinate of a pixel within a frame, and the latitude and

longitude of the corresponding point, based on the coordinate

information provided within the [coverage section] of each [frame

file].

1536 pixels

256 pixels

1536 pixels

Subframes

CIB Frame

(6 X 6 Subframes)

256 pixels

FIGURE 2.

CIB Frame/Subframe Structure.

b. In addition, CIB frames may be considered to form conceptual

"rows" and "columns" within zones. The APPENDIX, Section A.3.6,

uses this concept to define the naming convention of frames for

various resolutions by using the resolution and zone specific

"frame number." The rows and columns are numbered from 0. The

origin for counting nonpolar frame rows and columns is the

southernmost latitude of the zone and 180� west longitude, with

columns counted in an easterly direction from that origin. The