1、 MIL-STD-LB20 CHG NOTICE 2 9997733 0485942 773 NOTE: Notice 2, dated 17 February 1996, changes the cover page of this standard for administrative reasons. There are no other changes to this document. I NOT MEASUREMENT I SENSITIVE MIL-STD-1820 17 December 1992 DEPARTMENT OF DEFENSE INTERFACE STANDARD
2、 FOR GENERIC TRANSFORMED DATA BASE (GTDB) AMSC NiA FSG 69GP DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Supersedes cover page of MIL-STD-1820, dated 17 December 1992 Licensed by Information Handling ServicesflIL-STD-18ZO CHG NOTICE 2 79999LL 048599% “37 NOTICE O
3、F CHANGE I NOT MEASUREMENT 1 SENSITIVE MIL-STD-1820 NOTICE 2 17 February1 996 DEPARTMENT OF DEFENSE INTERFACE STANDARD FOR GENERIC TRANSFORMED DATA BASE (GTDB) TO ALL HOLDERS OF MIL-STD-1820: 1. THE FOLLOWING PAGES OF MIL-STD-1820 HAVE BEEN REVISED AND SUPERSEDE THE PAGES LISTED: NEW PAGE DATE SUPER
4、SEDED PAGE DATE Cover Page 17 February 1996 Cover Page 17 December 1992 II 17 February 1996 i 17 December 1992 2. RETAIN THIS NOTICE AND INSERT BEFORE TABLE OF CONTENTS. 3. Holders of MIL-STD-1820 will verify that page changes and additions indicated above have been entered. This notice page will be
5、 retained as a check sheet. This issuance, together with appended pages, is a separate publication. Each notice is to be retained by stocking points until the military standard is completely revised or cancelled. Custodians: Army - PT Navy - TD Preparing activity: Air Force - 11 AMSC: NIA FSG: 69GP
6、DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling Services+ MIL-STD-I1820 CHG NOTICE L = 99999LL 0473639 953 MIL-STD-1820 NOTICE 1 17 April 1994 MILITARY STANDARD GENERIC TRANSFORMED DATA BASE (GTDB) DESIGN STANDARD TO ALL HOLDERS OF M
7、IL-STD-1820: 1. THE FOLLOWING PAGES OF MIL-STD-1820 HAVE BEEN REVISED AND SUPERSEDE THE PAGES LISTED: NEW PAGE 9 10 13 13a 14 1 4a 15 16 69 70 70a A-23 A-24 A-65 A-65a A-66 A-83 A-83a A-84 A-9 1 A-9 1 a A-9 1 b A-92 8 A-93 A-93a A-9 4 AMSC: N/A DATE 17 April 1994 17 December 1992 17 April 1994 17 Ap
8、ril 1994 17 April 1994 17 April 1994 17 April 1994 17 December 1992 17 December 1992 17 April 1994 17 April 1994 17 December I992 17 April 1994 17 April 1994 17 April 1994 17 December 1992 17 April 1994 17 April 1994 17 December 1992 17 April 1994 17 April 1994 17 April 1994 17 December 1992 17 Apri
9、l 1994 17 April 1994 17 December 1992 SUPERSEDED PAGE DATE 9 13 New Page 14 New Page 15 - - - 70 New Page - A-24 A-65 New Page - A-83 New Page - A-9 1 17 December 1992 17 December 1992 17 December 1992 17 December 1992 REPRINTED WITHOUT CHANGE - - REPRINTED WITHOUT CHANGE REPRINTED WITHOUT CHANGE 17
10、 December 1992 - REPRINTED WITHOUT CHANGE 17 December 1992 17 December 1992 - REPRINTED WITHOUT CHANGE 17 December 1992 - REPRINTED WITHOUT CHANGE 17 December 1992 New Page i 7 December i 992 New Page 17 December 1992 A-93 17 December 1992 New Page 17 December 1992 - REPRINTED WITHOUT CHANGE - REPRI
11、NTED WITHOUT CHANGE AREA: 69GP DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesMIL-STD-1820 NOTICE 1 17 April 1994 2. RETAIN THIS NOTICE AND INSERT BEFORE TABLE OF CONTENTS. 3. Holders of MIL-STD-1820 will verify that page ch
12、anges and additions indicated above have been entered. This notice page will be retained as a check sheet. This issuance, together with appended pages, is a separate publication. Each notice is to be retained by stocking points until the military standard is completely revised or cancelled. 4. Chanc
13、es from Drevious issue. The margins of this Change Notice are marked with bars to indicate where changes (additions, modifications, corrections, deletions) from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies i
14、n these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Custodians: Army - PT Navy - TD Air Force - 11 Preparing activity: Air Force - 11 Pro
15、ject number 69GP-0 130 2 Licensed by Information Handling Services MIL-STD-1820 CHG NOTICE 2 9999911 0485943 BOT = MIL-STD-1820 NOTICE 2 DEPARTMENT OF DEFENSE Washington DC 20360 GENERIC TRANSFORMED DATA BASE (GTDB) 1. This standard is approved for use by all Departments and Agencies of the Departme
16、nt of Defense. 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: ASC/ENSI, Bldg 125, 2335 Seventh Street, Suite 6, Wright-Patterson AFB OH 45433-7809 by using the Standardization Document Impro
17、vement Proposal (DD Form 1426) appearing at the end of this document or by letter. Supersedes page ii of MIL-STD-1820, dated 17 December 1992. ii Licensed by Information Handling ServicesMIL-STD-LZO LL 0384L3b 576 W MIL-STD-1820 FOREWORD The Generic Transformed Data Base (GTDB) standard establishes
18、the file, record, and field formats for digital geographic data bases to be used by real-time simulators. The GTDB is one of two standard data base formats developed for training simulator use under Air Force Project 2851. The other, Standard Simulator Data Base Interchange Format (SIF), is document
19、ed in a separate military standard. The application of one or both of these standards during -the acquisition of a training simulator system is expected to reduce the cost associated with data base development for that system, as well as systems which may follow in the future. The document is struct
20、ured in four sections, including the main body of the standard and three appendices. The main standard defines the format of the GTDB as a hierarchy of files, records, and fields. All data bases identified as GTDBs must conform to this format. Appendix A is a mandatory part of the standard, which gi
21、ves the detailed definition of each GTDB data field, as an Ada type as well as a range of permissible values. Appendix B is a mandatory part of the standard, which lists the Feature Descriptor Codes used within a GTDB. Appendix C is a guidance-only section, which provides illustrative background inf
22、ormation on the format defined in the main standard. For the first-time GTDB user/implementer, it is recommended that Appendix C, “Rationale and Guidance“, be studied carefully before reading the detailed design portions of the standard itself. iii Licensed by Information Handling Services1 1.1 1.2
23、2 . 2.1 2.2 2.3 3 . 3.1 4 4.1 4.1.2 4.1.3 4.2 4.2.1 4.2.1.1 4.2.1.2 4.2.2 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4 4.2.2.5 4.2.2.6 4.2.2.7 4.2.2.8 4.2.2.9 4.2.2.10 4.2.2.11 4.2.2.12 4.2.2.13 4.2.2.13.1 4.2.2.13.2 4.2.2.13.3 4.2.2.13.4 4.2.2.13.5 4.2.2.14 4.2.2.14.1 4.2.2.14.2 4.2.2.14.3 4.2.2.14.4 4.2.2.14.5
24、 4.2.2.15 4.3 4.3.1 4.3.1.1 4.3.1.2 4.3.2 MIL-STD-1820 W 9999911 0384137 402 MIL-STD-1820 Table of Contents SCOPE 1 Purpose . 1 Scope . 1 APPLICABLE DOCUMENTS 1 Government Documents i Non-Government Publications . 1 Order of Precedence . 1 DEFINITIONS AND ACRONYMS 2 Acroynms 2 GENERAL REQUIREMENTS 3
25、 Media . 3 Structure/Labeling 3 Multi-Volume Sets . 3 Content . 3 Field Population 3 Valid Data 3 Default Data 3 Content Specification . 3 Datum . 3 Coordinate Cyst em . 4 Terrain Representation 4 Vertex Normals 4 Synthetic Culture . 4 Boundary SLOD Matching 4 Convex Polygons . 4 Edge Limit 4 Model
26、References 4 Expanded Lineals 4 Face Count Exception 5 SLOD Parameters . 5 Keep-List . 5 Delete-List . 5 Level-List 5 Thinning Tolerance . 5 Highest Level of Detail . 5 Area Block Parameters . 5 Area Block Dimensions . 5 Face Count Limit 5 Fragmented Point Light Strings 5 Model Reference Limit . 6 T
27、errain Goodness-of-Fit . 6 Number of Terrain Polygons 6 Additional Islands 6 Data Formats 6 Non-Texture Data 6 Field Format 6 Inter-Field Separation 6 Texture Data 6 (I . iv Licensed by Information Handling Services5 5.1 5.2 5.2.1 5.2.2 5.2.2.1 5.2.2.2 5.2.2.3 5.2.2.4 5.2.2.4.1 5.2.2.4.2 5.2.2.4.3 5
28、.2.2.4.4 5.2.2.4.5 5.2.2.4.6 5.2.2.4.7 5.2.2.4.8 5.2.2.4.9 5.2.2.5 5.2.2.6 5.2.2.6.1 5.2.2.6.2 5.2.2.7 5.2.2.8 5.2.2.9 5.2.2.10 5.2.2 . 11 5.2.2.12 5.2.2.13 5.2.2.14 5.2.2.15 5.2.2.16 5.2.2.17 5.2.2.18 5.3 5.3.1 5.3.2 5.3.2.1 5.3.2.2 5.3.2.3 5.3.2.4 5.3.2.5 5.3.2.6 5.3.2.7 5.3.2.8 5.4 5.4.1 5.4.2 5.
29、4.2.1 5.4.2.2 5.4.2.3 MIL-STD-1820 = 99999LL 0384138 349 MIL-STD-1820 Table of Contents DETAILED REQUIREMENTS . 6 Data Base Structure . 6 Gaming Area Header File . 8 GAB Record Order 9 GAH Field Structure . 9 GAH Identifier Record . 9 GAH File Name Record 9 Gaming Area Header Record . 9 GTDB Paramet
30、ers Record 10 Coordinate System Parameters Subrecord 10 Generic Areal Texture Parmeters Subrecord 11 Specific Model Texture Parameters Subrecord . 11 Generic Model Texture Parameters Subrecord 12 Image Capture Data Range Subrecord 12 Acceptable Percentage of Cloud Cover Subrecord 12 Specific Areal T
31、exture Parameters Subrecord . 11 Time of Year Preference Subrecord . 12 Acceptable Percentage of Shadow Cover Subrecord . 12 Boundary Point Record . 12 Model List Record . 13 Generic Model Texture Parameters Subrecord 13 Keep-List Record 14 Delete-List Record 14 Level-List Record . 14 Specific Model
32、 Texture Parameters Subrecord . 13 CLOD Parameters Record 13 Area Block Parameters Record 14 Island Record . 14 Island Boundary Point Record 15 Option Record . 15 Affected AB Count Record 15 Affected AB ID Record . 15 Checksum Record . 15 Model Library Header (MLH) File . 15 MLH Record Order 16 Isla
33、nd LOD Record . 15 MLH Field Structure . 16 MLH Identifier Record . 16 Model Library Header Record . 16 Culture Color Table Record 16 Model LOD Complexity Table Record . 17 Checksum Record . 17 File Name Record 16 Light Color Table Record 16 Model Complexity Statistics Table Record 17 Simulator Leve
34、l of Detail Header (SLODH) File . 17 SLODH Record Order 17 SLODB Identifier Record . 17 File Name Record 17 SLODH File Header Record 18 SLODH Field Structure . 17 V Licensed by Information Handling ServicesMIL-STD-1820 m L1 038V139 285 m 5.4.2.4 5.4.2.4.1 5.4.2.5 5.4.2.6 5.4.2.7 5.4.2.8 5.4.2.9 5.4.
35、2.10 5.5 5.5.1 5.5.2 5.5.2.1 5.5.2.2 5.5.2.3 5.5.2.4 5.5.2.4.1 5.5.2.4.2 5.5.2.4.3 5.5.2.5 5.5.2.6 5.5.2.7 5.5.2.8 5.5.2.9 5.5.2.10 5.6 5.6.1 5.6.2 5.6.2.1 5.6.2.2 5.6.2.3 5.6.2.4 5.6.2.5 5.6.2.6 5.6.2.7 5.7 5.7.1 5.7.2 5.7.2.1 5.7.2.2 5.7.2.3 5.7.2.4 5.7.2.5 5.7.2.6 5.7.2.7 5.7.2.8 5.7.2.9 5.7.2.10
36、 5.7.2 . 11 5.7.2.12 5.7.2.13 5.7.2.14 5.7.2.15 5.7.2.16 5.7.2.17 5 . 7 . 2.18 MIL-STD-1820 Table of Contents SLOD Header Record 18 Feature Distribution Table Record . 18 SMC Distribution Record . 19 Culture Color Table Record 19 Light Color Table Record 19 Checksum Record . 19 ABH Record Order 20 A
37、BH Field Structure . 20 ABH Identifier Record . 20 File Name Record 20 ABH File Header Record 20 Area Block Header Record 20 SLOD Polygon Density Statistics Table Subrecord . 18 2-Density Distribution Table Record . 19 Area Block Header (ABH) File 19 0 Polygon Density Statistics Table Subrecord 21 T
38、errain Roughness Statistics Subrecord 21 Area Block Existence Flags Subrecord 21 Feature Distribution Table Record . 21 SMC Distribution Record . 21 Culture Color Table Record 22 Light Color Table Record 22 Areal Texture Table Record 22 Checksum Record . 22 TLH Record Order 22 TLH Field Structure 22
39、 TLH Identifier Record . 22 File Name Record 22 Texture Library Header Record . 23 Texture Library Header (TLH) File . 22 a . Texture Library Complexity Statistics Record 23 Texture Distribution Table Record . 24 Stage 1 Texture Field Association Record 24 Checksum Record . 24 2-D Static Model (2DSM
40、) Library File 24 2DSM Record Order . 25 2DSM Field Structure 25 2DSM Identifier Record 25 File Name Record 25 2DSM Header Record 25 Model Header Record . 26 LOD Header Record . 26 LOD Texture Reference Pointer Record 26 Component Header Record . 27 Component Texture Reference Pointer Record 27 Mode
41、l Polygon Record 28 Model Microdescriptor Record 28 Vertex Pointer Record . 29 Polygon FACS Record . 29 Polygon Texture Reference Pointer Record 29 Subsidiary Model Reference Record . 29 Point Light String FACS Record 31 Point Light String Record . 30 Model FACS Record 31 Face-Based Texture Referenc
42、e Record 31 . O . vi Licensed by Information Handling ServicesMIL-STD-3420 6 9799933 0384340 TT7 = 5.7.2.19 5.7.2.20 5.7.2.21 5.7.2.22 5.8 5.8.1 5.8.2 5.8.2.1 5.8.2.1.1 5.8.2.1.2 5.8.2.1.2.1 5.8.2.1.2.2 5.8.2.1.2.3 5.8.2.1.2.4 5.8.2.1.2.5 5.9 5.9.1 5.9.2 5.9.2.1 5.9.2.2 5.9.2.3 5.9.2.4 5.9.2.5 5.9.2
43、.6 5.9.2.7 5.9.2.8 5.9.2.9 5.9.2.10 5.9.2.11 5.9.2.12 5.9.2.13 5.9.2.14 5.9.2.15 5.9.2.16 5.9.2.17 5.9.2.18 5.9.2.19 5.9.2.20 5.9.2.21 5.9.2.22 5.9.2.23 5.10 5.10.1 5.10.2 5.10.2.1 5.10.2.1.1 5.10.2.1.2 5.10.2.1.2.1 5.10.2.1.2.2 5.10.2.1.2.3 5.10.2.1.2.4 5.10.2.1.2.5 5.11 5.11.1 MIL-STD-1820 Table o
44、f Contents Vertex-to-Vertex Texture Reference Record . 31 Model-Based Texture Reference Record 32 Non-Mapped Texture Reference Record . 32 Checksum Record . 32 2-D Static Model Vertex (2DSMV) File 32 2DSMV File Structure 32 2DSMV Record Structure 32 2-D Static Model Vertex Pseudo-Files 32 2DSM Pseud
45、o-File Field Structure 33 2DSMV Identifier Record . 33 File Name Record 33 Vertex Record . 33 Pseudo-EOF Record . 33 Checksum Record . 33 3DSM Record Order . 34 3DSM Field Structure 34 3DSM Identifier Record 34 3DSM File Name Record . 34 3DSM Header Record 34 Model Header Record . 35 LOD Header Reco
46、rd . 35 2DSMV Pseudo-File Record Order 33 3-D Static Model (3DSM) Library File 33 LOD Texture Reference Pointer Record 35 Component Header Record . 36 Component Texture Reference Pointer Record 36 Model Microdescriptor Record 37 Vertex Pointer Record . 38 Polygon FACS Record . 38 Polygon Texture Ref
47、erence Pointer Record 38 Subsidiary Model Reference Record . 38 Point Light String FACS Record 40 Face-Based Texture Reference Record . 40 Vertex-to-Vertex Texture Reference Record . 40 Model-Based Texture Reference Record 41 Non-Mapped Texture Reference Record . 41 Separation Plane Record . 41 3-D
48、Static Model Vertex (3DSMV) File 41 Model Polygon Record 37 Point Light String Record . 39 Model FACS Record . 40 Checksum Record . 41 3DSMV File Structure 41 3DSMV Record Structure 42 3DSMV Pseudo-Files 42 3DSMV Pseudo-File Record Order 42 3DSMV Pseudo-File Field Structure . 42 3DSMV Identifier Rec
49、ord . 42 File Name Record 42 Vertex Record . 42 Pseudo-EOF Record . 42 Checksum Record . 42 3-D Dynamic Model (3DDM) Library File . 42 3DDM Record Order . 43 vi i Licensed by Information Handling ServicesMIL-STD-1820 5.11.2 5.11.2.1 5.11.2.2 5.11.2.3 5.11.2.4 5.11.2.5 5.11.2.6 5.11.2.7 5.11.2.8 5.11.2.9 5.11.2.10 5.11.2.11 5.11.2.12 5.11.2.13 5.11.2.14 5.11.2.15 5.11.2.16 5.11.2.17 5.11.2.18 5.11.2.19 5.11.2.20 5.11.2.21 5.11.2.22 5.11.2.23 5.11.2.24 5.12 5.12.1 5.12.2 5.12.2.1 5.12.2.1.1 5.12.2.1.2 5.12.2.1.2.1 5.12.2.1.2.2 5.12.2.1.2.3 5.12.2.1.2.4 5.12.2.1.2.5 5.13 5.13.1 5.
