The Controlled Image Base (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 the CIB specification at one of the registered resolutions defined in MIL-STD-2411-1.
The SPOT panchromatic imagery used initially had a 10 meter ground sample distance. The SPOT commercial imagery was orthonormalized using NIMA Digital Terrain Elevation Data Level 1 (DTED1). CIB t will eventually be produced from stereo imagery that has been orthorectified to remove relief displacements and other sources of positional error. As unclassified imaging systems attain higher resolution, CIB will migrate toward a target ground sample distance of 5 meters. Controlled Image Base Unclassified Digital imagery 5 meter resolution images are used for tailored products information fusion to support medium-scale feature identification extraction.
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. The CIB product and associated distribution media are unclassified. If special classified CIB products are required, media containing CIB data carry the highest classification and restrictions that are determined from the original source images which remain imbedded in the product.
The CIB product is produced directly from source images and reformatted into a CIB frame file structure. 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 scale/resolution code for the product contained in MIL-STD-2411-1. The processing involves projecting the image data into the ARC system, grouping pixels into frames and subframes of constant size and vector quantization image compression. The 8:1 reduction in the size of CIB files compared to source imagery and the reformatting of the data into RPF offers distinct operational, logistical, and supportability benefits to many users of digital imagery data. It permits the same datasets to be used for both ground-based and aircraft cockpit displays, offers significant savings in media storage/transportation and peripherals (i.e., hard disk) costs, results in faster data loading times and requires less frequent reloading of hard disks from media. The compression of CIB data results in no perceptible loss of image quality.
The horizontal accuracy of CIB data depends on the accuracy of the image source from which the CIB was derived and the accuracy of the information used to orthorectify the image. The horizontal accuracy attribute within the CIB frame file defines the accuracy for each frame file or areal extent. Previous experience has shown that accuracies of 25 meters or better are achievable for imagery of 10m Ground Sample Distance (GSD) or better in many cases. At least nine out of any ten randomly chosen points mensurated and computed from CIB will fulfill the horizontal accuracy listed in the attribute section for the particular image source utilized in production. Accuracies shall be determined relative to a 90% Circular Map Accuracy Standard (CMAS) within WGS 84 (NIMA TR 8350.2). The accuracy error attributable to compressing the CIB data contributes insignificantly to the total accuracy of the product.
Release is determined on a case-by-case basis. Intent is for the final product to be released to DoD, its contractors, and other Executive Agencies supporting DoD activities.