1、I METRIC I MIL-C-89038 MILITARY SPECIFICATION Compressed ARC Digitized Raster Graphics (CADRG) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 ScoDe. This specification provides requirements for the preparation and use of the Raster P
2、roduct Format (RPF) Compressed ARC Digitized Raster Graphics (CADRG) data. CADRG is a general purpose product, comprising computer-readable digital map and chart images. It supports various weapons, C31 theater battle management, mission planning, and digital moving map systems. CADRG data is derive
3、d directly from ADRG and other digital sources through downsampling, filtering, compression, and reformatting to the RPF Standard. CADRG files are physically formatted within a National Imagery Transmission Format (NITF) message. 1.2 PurDose. The purpose of this document is to specify the data forma
4、t and characteristics of CADRG for producers and users. 1.3 Securitv. 1.3.1 Securitv classlflcat ion of specification. This product specification is UNCLASSIFIED. II 1.3.2 Securitv classlflcation of Droduct . Media containing 0, CADRG data shall carry the highest classification and restrictions that
5、 are determined from the original source graphics. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, Defense Mapping Agency, ATTN: PR ST A-13, 8613 Lee Highway, Fairfax, VA 22031-2137 by
6、 using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A AREA MCGT DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted withou
7、t license from IHS-,-,-MIL-C-89038 m 999990b 19945t0 713 MIL-C-89038 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 SDecifications. standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise
8、specified, the issues of these documents are those listed in the current Department of Defense Index of Specifications and Standards (DODISS) and the supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MILITARY MIL-A-89007 - Defense Mapping Agency, Military Specification: ARC Dig
9、itized Raster Graphics STANDARDS MILITARY MIL-STD-2411 - Defense Mapping Agency, Military Standard, Raster Product Format (RPF) MIL-sTD- - Defense Mapping Agency, Military Standard, Registered Data Values for Raster Product Format MIL-STD-2411-2 - Defense Mapping Agency, Military Standard, Integrati
10、on of Raster Product Format Files Into the National Imagery Transmission Format MIL-STD-2500 - Military Standard, National Imagery Transmission Format (Version 2.0) MIL-STD-600010 - Department of Defense, DMA Stock Number Bar Coding MIL-STD-129 - Marking for Shipment and Storage HANDBOOKS MILITARY M
11、IL-HDBK-1300 - Military Handbook, National Imagery Transmission Format Standard (NITFS) (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 191
12、11-5094.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.1.2. Other Government documents, drawinas, and publication$. The following other Government documents, drawings, and publications form a part of this document to the extent specified herei
13、n. Unless otherwise specified, the issues are those cited in the solicitation. a. DMA Technical Manual, DMA TM 8358.1, Defense Mapping Agency: Datums, Ellipsoids, Grids, and Grid Reference Systems, First Edition. b. DMA Technical Report, DMA TR 8350.2: World Geodetic System 84, 2d Edition. c. DMA Te
14、chnical Instruction, TI/2DJ/001, DMA Technical Instructions and Quality Requirements for Printing and Finishing of Jewel Case Liners most of the color loss should not be operationally significant. The ability of output systems (e.g., printers and displays) to faithfully reproduce colors from CADRG d
15、ata depends on the resolution and color integrity of the output systems. 3.3 Datum. 3.3.2 Horizontal datum. The horizontal datum for CADRG shall be WGS-84, as defined by DMA TM 8358.1. 3.4 Product descrimion. The CADRG product shall conform to MIL-STD-2411. It normally will be produced directly from
16、 source maps of all scales by processing (see 3.10) and reformatting into a CADRG frame file structure (see 3.12). Miscellaneous scale maps and charts or non-DMA maps may be the source for CADRG production. The processing includes spatial reduction (pixel downsampling) with filtering, vector quantiz
17、ation image compression, and color quantization. To permit direct use by aircraft cockpit displays, CADRG data is arranged in frames and subframes with constant pixel sizes, and overlaps (see 3.5.4) that are consistent with limited memory and processing capabilities of avionics computers. 5 Provided
18、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-89038 m 9999906 1994524 369 m MIL-C-89038 3.4.1 Exchanae media and recordina formats. The CADRG shall be normally exchanged on compact disk-read only memory (CD-ROM) media. In addition, CADRG may be distr
19、ibuted on the recordable compact disks (CD-R), 130 mm (5.25-inch) erasable optical disks (EOD), 8 mm magnetic tape, and 4 mm magnetic tape cartridges. The media standards, listed in TABLE 1, and recording format standards for these media are as specified in MIL-STD-2411. Unlike the source ADRG files
20、, the contents of CADRG files do not conform to FIPS PUB 123 (IS0 8211) standards. TABLE 1. CADRG Media Standards. E Interchange Media CD-ROM CD-R (Recordable) Erasable Optical Disk 8 mm Tape Cartridge 4 mm Tape Cartridge Recording Standard ISO/IEC DIS 10139 TBD ISO/IEC DIS 10089 ISO/IEC DIS 11319 I
21、SO/IEC DIS 10777 Volume/File Structure IS0 9660 TBD IS0 13346 (Non- sequential Recording) IEEE 1003.1 (paragraph 10.1.1) “Extended tar“ IEEE 1003.1 (paragraph 10.1.1) “Extended tar“ 2.4.2 Source diuitized uraDhics. CADRG is derived from ADRG and other miscellaneous maps/charts or non-DMA maps. The C
22、ADRG scales and original source maps and their codes are listed in section 5.1.4 of MIL-STD-2411-1. These codes are used within the frame file designator names, as specified in APPENDIX 30.6. 3.4.3 Projection svstem. The ARC system, as described in MIL-A-89007, divides the surface of the earth ellip
23、soid into 18 latitudinal bands called zones. Zones 1-9 cover the Northern hemisphere and zones 10-18 (A through J, exclusive of I in CADRG) cover the Southern hemisphere. One zone in each hemisphere covers the polar areas. Each non-polar zone covers a part of the ellipsoid between two latitude limit
24、s and completely encircles the Earth. The nominal zone limits for CADRG are the same as for the source ADRG, as listed in TABLE 2. The extents of the CADRG zone overlaps are defined in APPENDIX 60. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
25、L-C-89038 W 9999706 L99Y525 2T5 W MIL-C-89038 TABLE 2. CADRG Zone Limits. - Equatorward Latitude Latitude Latitude Poleward Midpoint 32 41.12682127 48 48 56 56 52.28859923O 9 o 80 80 78.17283750 7 6 7 6 74.13230145 72 72 70.10896259 68 68 66.09421768 64 64 60.32378942 O 32 22.94791772 - 3.4.4 Distri
26、bution frames. The CADRG database is composed of rectangular grids of frames of pixels for each zone. CADRG can be distributed in rectangular or non-rectangular areas, and with contiguous or non-contiguous coverage (i.e., areas separated by large expanses of water, or multiple discrete maps for whic
27、h no contiguous maps exist). Each frame is represented by a discrete file. The CADRG library is seamless; that is, the edges of contiguous source maps are indistinguishable, except by color variations that are due to the differences between the colors or patterns in original source graphics. The ras
28、ter graphic data from each (sublframe abuts the data of neighboring (sub)frames exactly to provide unbroken coverage. Gaps in coverage exist where the source coverage does not exist. The boundaries of the distribution frames (see 3.5) are not required to coincide with the source map edges. 3.4.5 Dat
29、a file oraanizatioq. CADRG data files are arranged in a hierarchical directory/subdirectory structure (see FIGURE 1). The CADRG directories and data files, enumerated below, are fully described in paragraphs 3.11 through 3.12. All names and labels, and the format and structure of directories shall a
30、dhere to the conventions specified in MIL-STD-2411. Any computer system that can access distribution media conforming to the standards listed in TABLE 1 should be able to access CADRG data. a. Root Directory: Contains table of contents file, one or more directories of frame filels, a legend director
31、y, and one or more overview imagels. The root directory shall be named “RPF“ . 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-89038 W 9999906 L994526 131 W MIL-C-89038 rpf root directory (unordered) 1) (unordered) table of contents file over
32、view image (1, . many) legend directory (O, 1) (2) legend file (1, . many) 1) (unordered) frame directory (O, . many) (2) (unordered) frame file (O, many) subordinate directory (O, . many) (unordered) E31 frame file (O, . many) FIGURE la. CADRG Directorv and File Structure. RPF Directory I (Optional
33、) I I I overview frame filels frame filels FIGURE lb. Pictorial Representation of CADRG Directory and File Structure c b. table of contents file : The table of contents file provides an overview of the data contents of the distribution media. The frame file index section within the table of contents
34、 file provides path names to each of the frame filels on the interchange volume. The path names to the frame filels will 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-89038 be used by user applications software to locate the frame filels, r
35、ather than assume any particular names or directory structure. c. frame file directoryls: CADRG producers will choose the number of frame file directoryls in a given volume and convention for assigning frame filels to directories. Each frame file directory on a given interchange volume shall be uniq
36、uely named in a manner to be determined by an authorized producer. The producers may also assign nested frame file directoryls as needed to organize the frame filels, using a variable hierarchy. d. frame filels: The frame filels contain the tiled image and support data for the geographic frames on a
37、 CADRG interchange volume. Each frame file (see 3.12) shall include a header section, location section, coverage section, compression section, color/grayscale section, image section, attribute section (optional), related image section (optional), and replace/update section (only present for replacem
38、ents and updates). The frame file naming convention shall be in accordance with MIL-STD-2411, and is described in section 30.6 of the APPENDIX. e. legend file (S): The legend file (S) contain(s1 the tiled image data which represent the legend information from the original map series. Only one legend
39、 file is provided per map series; however, there are provisions for multiple legend filels per distribution volume. Each legend file (see 3.11.2) shall include a header section, location section, compression section, color/grayscale section, image section, and replace/update section (only present fo
40、r replacements and updates). legend filels shall be located within the legend directory which shall be named “RPF/LEGEND. I f. overview image (S) : One or more overview image S will be provided per CADRG interchange media. These indicate graphically where the frame filels are located with respect to
41、 political and ocean boundaries, similar to the Location Diagram (see 5.1.2) on the jewel-box liner. overview imagels will be located at the same level on the media as the table of contents file. Each overview image (see 3.11.3) shall include a header section, location section, compression section,
42、color/grayscale section, and image section. 3.4.6 Data formats. Data recording shall adhere to the conventions for logical data recording formats as specified in section 4.4 of MIL-STD-2411. CADRG files shall be integrated with the NITF message format in accordance with MIL-STD-2411-2. 3.5 Frame and
43、 subframe structure. 3.5.1 Pixel snacinq. The original source graphics for ADRG data (from which CADRG are derived) are scanned at a 100 micron (pl pixel resolution (254 pixels per inch) in both East-West and 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
44、 IHS-,-,-MIL-C-89038 North-South directions, and then warped from the datum of the original paper map or chart to the ARC projection using the WGS-84 ellipsoid. To produce CADRG, ADRG source data shall be spatially reduced (see 3.10.2) from the ADRG pixel spacing to a 150 p pixel spacing (169 pixels
45、 per inch). For each map or chart scale, a constant latitudinal (row) and longitudinal (column) pixel interval shall exist in each zone, as defined in section 60 of the APPENDIX. The numbers of CADRG pixels in the longitudinal direction shall be adjusted so that there are integral numbers of subfram
46、es per zone. In the polar zone, the number of CADRG pixels is adjusted so that there is an even number of subframes across the zone in each dimension. 3.5.2 Fra me and subframe tlllnq. a. Each frame shall comprise a rectangular array of 1536 by 1536 pixels (2,359,296 pixels). Each frame shall be til
47、ed into a grid of 6 by 6 subframes (36 subframes) Each subframe shall comprise a rectangular array of 256 by 256 output pixels (65,536 pixels). Subframes shall be numbered as depicted in FIGURE 2, in accordance with MIL-STD-2411. - b. All frames and subframes within a zone shall abut in a mutually e
48、xclusive manner without any pixel overlap or pixel redundancy. The northern and southern boundaries of a zone generally will not fall exactly on the northern and southern boundaries of a frame or subframe. There shall be frame overlap between the zones, as defined in section 3.5.4. c. For several sc
49、ales of source product, APPENDIX 60 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), North-South pixel spacing constants (i.e., number of pixels in 90
