1、Designation:E256013Standard Specification forData Format for Pavement Profile1This standard is issued under the fixed designation E2560;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses
2、 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification describes a data file format for pave-ment profile.1.2 This specification describes the variables and sizes of alldata that will be stored in
3、 the file.The file is in binary format,and is fully documented in this specification.1.3 This specification is designed to be independent ofhardware platforms,computer languages,and Operating Sys-tem(OS).1.4 This standard does not purport to address all of thesafety concerns,if any,associated with i
4、ts use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E867 Terminology Relating to Vehicle-Pavement Systems2.2 IEEE Standards:
5、3IEEE 7542008(2008)Floating-Point Arithmetic3.Terminology3.1 Definitions:3.1.1 Terminology used in this specification conforms to thedefinitions included in Terminology E867.3.2 Definitions of Terms Specific to This Standard:3.2.1 signedinteger capable of representing negative val-ues.3.2.2 unsigned
6、integer only capable of representing non-negative values.3.2.3 Int8data type for an 8-bit,unsigned integer.3.2.4 Int32data type for a 32-bit,signed integer.3.2.5 Singledata type for a 32-bit,signed real number,such as,single precision IEEE floating point.3.2.6 Stringdata type for a variable-length A
7、SCII string.No null character is included at the end of the string.Aseparatefield defines the length of the string.3.2.7 3-byte Stringan ASCII string of 3 characters inlength.No null character is included at the end of the string.3.2.8 4-byte Stringan ASCII string of 4 characters inlength.No null ch
8、aracter is included at the end of the string.3.2.9 8-byte Stringan ASCII string of 8 characters inlength.No null character is included at the end of the string.3.2.10 Array(numeric data type)sequence of data of thespecified numeric data type.Only the values are stored,noinformation about the array i
9、s stored.3.2.11 Array(String)ASCII strings separated by a tab.There is no tab after the last string.3.3 Symbols:3.3.1 ntotal channels of elevation data.3.3.2 mtotal number of test locations(that is,data points).4.Profile Data Specifications4.1 File Structure:4.1.1 The general file structure is divid
10、ed into five sections:(1)File Header;(2)Metadata;(3)Longitudinal Profile Data;(4)Transverse Profile Data;and(5)File Trailer.The fivesections are stored sequentially.(See Fig.1.)4.1.2 Each of these portions of the file is described in thefollowing sections,as well as the data types and otherdescripto
11、rs that will be required by the file.The data will bewritten to the file sequentially,with the offsets listed in the fileheader as guides to find various portions of the file.It isimportant to note that all offsets are relative to the beginning ofthe file.Because offset values may not be known at th
12、e time ofwriting the file header,these values need not be written.However,spare space must still be reserved for the offsets sothat values can be updated when known.4.2 File HeaderFile header contains the information per-taining to the data file type,software version information,andinformation about
13、 the data contained(Table 1).4.3 Metadata:1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.31 onMethods for Measuring Profile and Roughness.Current edition approved June 1,2013.Published July 2013.Origi
14、nally approvedin 2007.Last previous edition approved in 2007 as E2560 07.DOI:10.1520/E2560-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summ
15、ary page onthe ASTM website.3Available from Institute of Electrical and Electronics Engineers,Inc.(IEEE),445 Hoes Ln.,P.O.Box 1331,Piscataway,NJ 08854-1331,http:/www.ieee.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.3.1 Metadata
16、is structured,descriptive information about aresource,or data about data.Using metadata in the binary fileformat will allow generic operating on the data informationabout which the reader software has no prior knowledge.Also,metadata will allow scalable evolution of the data descriptionwithout requiring simultaneous upgrades to all reader software.4.3.2 The first value in the metadata portion will provide thenumber of metadata entries(MDE)(Table 2).Table 3 showsthe information required to constr