地理信息 空间模式和其他类似重要的模式的通用标准
|
| 作者：不详 来源：不详 更新时间：2008-3-27 10:15:43 |
 减小字体
 增大字体
|
| 编 号 | 19137 | | 名 称 | 地理信息 空间模式和其他类似重要的模式的通用标准
Geographic information - Generally used
profiles of the spatial schema and of similar important other schemas | | 负责人 | Mr. Josef Dorfschmid | | 工作组 | 第7工作组 | | 进 展 | 工作阶段 计划完成时间
各阶段相关最新文件
国际标准（IS）: 2005年6月 无
最终国际标准草案（FDIS）: 2005年3月 无
国际标准草案（DIS）: 2004年7月 无
委员会草案（CD）: 2003年12月 无
工作草案（WD）: 2003年7月 N
1222
前面打“√”的为已完成阶段 | | 范 围 | Develop a set of profiles of the spatial schema to provide a minimal set of geometric elements necessary for an efficient creation of application schemata.
These profiles will include components from ISO 19107 Spatial schema, ISO 19108 Temporal schema, ISO 19109 Rules for application schema development, ISO 19111 Spatial referencing by coordinates and shall clarify the corresponding encoding rules in ISO 19118 Encoding.
The profiles shall suppport many of the spatial data formats and description languages already developed and in broad use within a group of nations or liaison organizations. | | 目 的 | ISO 19107 provides a very complete overview of possible geometric elements which are usable to treat geographic data in general. As what the conformance clause of 19107 states, it is necessary to select the appropriate types for an application. In order to keep the advantage of interoperability, this selection - or profiling -should be done in a standardized way. Therefore resolution 174 of TC211 -plenary in Lisbon states: "Noting the proposal from the Danish national body regarding future work within WG 2 (document N 1068, see annex), ISO/TC 211 acknowledges the importance of developing profiles of ISO 19107, and invites the Swiss member body to develop a new work item proposal on this matter in cooperation with other interested parties".
In the "Joint Nordic test case using ISO/TC 211 standards" the following conclusions deal with the spatial schema: "A profile of the Spatial schema had to be developed from scratch and could not be based directly on the existing Spatial UML model. This because the textual conformance clauses overrides the UML model and the correlation between the text and the model is insufficient. It is therefore not possible to use the Spatial UML model directly in a model-driven approach without first creating a separate profile. … However, the main problem for encoding is the lack of information that certain types should be basic data types with special encoding, e.g. the coordinate types. This led to special handling of DirectPosition, GM_PointRef and GM_PointArray, which breaks with the general XML Encoding rules. The Encoding standard allows exceptions as long as it is clearly documented, but to facilitate interoperability someone should propose a default canonical form to encode these types."
The Editing Committee treating the comments on CD 19107.3 (document N924) made different remarks concerning the necessity for profiling the spatial schema (see document N 1031). The Swiss comment 5 (CH0) with "…The proposed geometric data types are unnecessary complicated" is answered by the EC as "The EC believes that it would be a reasonable approach for new work items to be proposed for the creation of domain specific profiles, e. g., cadastral". Comment 25 (NO5) of Norway "…Data interoperability and data transfer requires that a user should understand without any ambiguity the geometric and topological aspects of the geographic dataset. This seems unlikely when there will be several un-standardized schemas, even if it based on the schemas in this draft…" with the proposed change "…Consider the need of standardized profiles of spatial schema to be used making application schemas" is answered by the EC "Accepted. The EC believes that NWIPs should be proposed to develop specific application schemas that include profiles of the spatial schema".
Some organizations and national bodies have experience with the applicability of data types and others use practically the model-based approach to treat geographic data e.g.:- DIGWG (DIGEST special geometry types are used in a variety of applications, They allow to exchange a big amount of data in the military domain)- OGC (bases interperability on own geometry: simple features)- ISO/TC204 WG 7 (GDF with special data types for road net modelling)- Norway, Sweden, Finland, Denmark (joint nordic test case with own 19107 profiles transfers cadastral data between Finland and Norway)- Germany, Australia (start to apply the ISO 19100 series to cadastre modeling)- Switzerland (uses the conceptual schema language INTERLIS with few geometric data types since years successfully to model cadastre-, AM/FM-, planning-, traffic- etc. data, to develop tools and to transfer every day lots of data of very different structure among very different systems)
These experiences shall be taken into account to select sets of applicable data types together with fixed encoding rules and to link them to corresponding elements of the complete overview in the different ISO 19100 documents, especially in ISO 19107 Spatial schema.See annex for the proposed 4 step procedure. | | 其 它 | 立项时间 2002年5月 立项文件：N 1222 N 1277 |
|
|
[]
[返回上一页]
[打 印]
|
|
|
您当前的位置：