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.

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MIL-PRF-89041A

to this product specification.

3.4 Product description. The CIB product shall conform to

MIL-STD-2411. It will be produced directly from source images

and reformatted into a CIB frame file structure. CIB files will

be physically formatted within the NITF message. CIB images are

grayscale (monochromatic), although the input for CIB may be

multispectral (i.e., CIB may be derived from a grayscale image,

from one band of a multispectral product, or from an arithmetic

combination of several multispectral bands). Images will be

processed into a CIB product with a specified resolution which

will be reflected in the data series code for the product

contained in MIL-STD-2411-1. The processing involves projecting

the image data into the Equal Arc-second Raster Chart/map (ARC)

system, grouping pixels into frames and subframes of constant

size and vector quantization image compression, as defined in

3.14.1.

3.4.1 Exchange media and recording formats. The standard

CIB data set shall be exchanged on compact disk-read only memory

(CD-ROM) media. In addition, CIB may be distributed on the media

types specified in MIL-STD 2411. The CIB product will have

minimal exploitation software associated or provided.

3.4.2 Source Imagery. Portions of one or more source

images are mosaiced together to form each frame file. Source

images are othorectified to Mean Sea Level (MSL) using National

Imagery and Mapping Agency Digital Terrain Elevation Data (DTED)

or other data which provide the required accuracy for the removal

of terrain relief and other distortions present within the

original source imagery.

3.4.3 Projection system. The CIB product conforms to the

ARC projection system, which divides the surface of the earth

ellipsoid into 18 latitudinal bands, called zones. Zones 1-9

cover the northern hemisphere, and zones 10-18 (A through J,

exclusive of I in CIB) cover the southern hemisphere. Zone 9 and

J cover the polar areas in the northern and southern hemispheres,

respectively. Each nonpolar zone covers a part of the ellipsoid

between two latitude limits and completely encircles the Earth.

The nominal zone limits for CIB are listed in MIL-STD-2411-1.

The extents of the CIB zone overlaps are defined in the APPENDIX,

Section A.5.

3.4.4 Distribution frames. The CIB database is composed of

rectangular grids of frames of pixels for each zone and can be

distributed with contiguous or non-contiguous coverage. Each

frame is represented by a discrete file.

3.4.4.1 Imagery Seams. CIB is designed to be seamless.

Seamless is generally interpreted to allow a "shear" of one pixel

or less of horizontal displacement. Source images are

indistinguishable except where shear and/or shifts in gray scale

values occur as a result of inconsistencies in source imagery