NSW Positioning Theme Survey Mark GDA2020

NSW Positioning Theme Survey Mark GDA2020Please NoteWGS 84 = GDA2020 serviceThis dataset has a spatial reference of [WGS 84 = GDA2020] and can NOT be easily consumed into GDA94 environments. A similar service with a ‘multiCRS’ suffix is available which can support GDA2020, GDA94 and WGS84 = GDA94 environments. In due course, and allowing time for user feedback and testing, it is intended that these original services will adopt the new multiCRS functionality.Metadata Portal Metadata InformationContent TitleNSW Positioning Theme Survey Mark GDA2020Content TypeHosted Feature LayerDescriptionThe NSW Survey Marks web service is a dynamic map of permanent survey marks that constitute the state control survey. The positioning data under the NSW Foundation Spatial Data Framework (FSDF) is fed to the web service by the Survey Control Information Management System (SCIMS), the database that contains the single source of truth for all marks within the state control survey network.This service provides GDA2020 coordinates, heights and related information for NSW survey marks that form the official State control survey network (as reported in SCIMS), plotted in their GDA2020 locations (equivalent to WGS84@2020). This service controls the precision of numerical output in a manner that mirrors SCIMS Online.The web service provides a wealth of data on each mark, including:Mark type (Permanent Mark, State Survey Mark, etc.)Mark numberHorizontal coordinates and their accuracy (class and order)Heights and their accuracy (class and order)Status of the mark (destroyed, restricted access, etc.)The mark type is represented using various shapes and the accuracy of the mark (both vertical and horizontal) is communicated by the colour.This web service allows users to easily integrate survey control mark data from SCIMS into Open Geospatial Consortium (OGC) compliant spatial platforms and applications.Data provided by the NSW Survey Mark web service can be used in a variety of engineering and surveying applications, including but not limited to:Cadastral survey planningFlood studies and hydrographic modellingInfrastructure developmentSite calibration at construction sitesElevation modellingPreservation of survey infrastructure.The NSW Survey Mark web service gives users an alternative method to access state control survey data that can be incorporated into their GIS package without needing to log into SCIMS Online.Please note that SCIMS Online is the official option for obtaining state control survey data for cadastral surveys as it offers legal traceability. SCIMS online is accessible via the Spatial portal.Initial Publication Date08/01/2020Data Currency01/01/3000Data Update FrequencyOtherContent SourceData provider filesFile TypeESRI File Geodatabase (*.gdb)Attribution© State of New South Wales (Spatial Services, a business unit of the Department of Customer Service NSW). For current information go to spatial.nsw.gov.auData Theme, Classification or Relationship to other DatasetsNSW Positioning Theme of the Foundation Spatial Data Framework (FSDF)AccuracyThis dataset was captured by utilising the best available source at a variety of scales and accuracies, ranging from 1:500 to 1:250 000 according to the National Mapping Council of Australia, Standards of Map Accuracy (1975). Therefore, the position of the feature instance will be within 0.5mm at map scale for 90% of the well-defined points. That is, 1:500 = 0.25m, 1:2000 = 1m, 1:4000 = 2m, 1:25000 = 12.5m, 1:50000 = 25m and 1:100000 = 50m. A program to upgrade the spatial location and accuracy of data is ongoing.This dataset depicts the location of survey marks based on their official GDA2020 coordinates. Survey mark positional accuracy is reported in the data fields for each mark and varies from mark to mark. Over time mark accuracy will change when new observations are added, and survey adjustments are completed.For additional information, please contact us via the Spatial Services Customer HubSpatial Reference System (dataset)GDA2020Spatial Reference System (web service)OtherWGS84 Equivalent ToGDA2020Spatial ExtentFull StateContent LineageFor additional information, please contact us via the Spatial Services Customer HubData ClassificationUnclassifiedData Access PolicyOpenData QualityHigh. Methodology and accuracy standards are defined in the NSW Surveyor General’s directions.For additional information, please contact us via the Spatial Services Customer HubTerms and ConditionsCreative CommonsStandard and SpecificationOpen Geospatial Consortium (OGC) implemented and compatible for consumption by common GIS platforms. The web service is built as per Spatial Services project specification.Data CustodianDCS Spatial Services346 Panorama AveBathurst NSW 2795Point of ContactPlease contact us via the Spatial Services Customer HubData AggregatorDCS Spatial Services346 Panorama AveBathurst NSW 2795Data DistributorDCS Spatial Services346 Panorama AveBathurst NSW 2795Additional Supporting InformationData Dictionaries

新南威尔士州定位主题测量标志GDA2020（Geocentric Datum of Australia 2020）服务
请注意：世界大地测量系统1984（World Geodetic System 1984, WGS 84）等效于GDA2020服务。本数据集的空间参考为[WGS 84 = GDA2020]，无法直接在GDA94（Geocentric Datum of Australia 1994, GDA94）环境中便捷使用。另有带“multiCRS”后缀的同类服务，可支持GDA2020、GDA94及WGS 84 = GDA94环境。待收集用户反馈并完成测试验证后，本原始服务将逐步启用多空间参考系统（multiCRS）功能。

## 元数据门户元数据信息
### 内容标题
NSW定位主题测量标志GDA2020
### 内容类型
托管要素图层（Hosted Feature Layer）
### 描述
新南威尔士州测量标志网络服务是构成州级官方控制测量体系的永久性测量标志的动态地图。新南威尔士州基础空间数据框架（Foundation Spatial Data Framework, FSDF）下的定位数据由测量控制信息管理系统（Survey Control Information Management System, SCIMS）推送至该网络服务，SCIMS是存储州级控制测量网络内所有测量标志权威数据源的专属数据库。
本服务提供构成官方州级控制测量网络的新南威尔士州测量标志的GDA2020坐标、高程及相关关联信息（数据源自SCIMS），并以其GDA2020点位（等效于WGS 84@2020）进行可视化标注。本服务的数值输出精度规则与SCIMS Online保持完全一致。
该网络服务可为每个测量标志提供丰富的关联数据，包括：
- 标志类型（永久性标志、州级测量标志等）
- 标志编号
- 水平坐标及其精度等级与阶数
- 高程及其精度等级与阶数
- 标志状态（已损毁、受限通行、正常可用等）
标志类型通过不同几何形状进行区分，标志的水平与垂直精度则通过颜色编码进行直观传达。
本网络服务支持用户轻松将SCIMS中的测量控制标志数据集成至符合开放地理空间联盟（Open Geospatial Consortium, OGC）标准的空间平台与应用程序中。
NSW测量标志网络服务提供的数据可应用于各类工程与测量场景，包括但不限于：
- 地籍测量规划
- 洪水研究与水文建模
- 基础设施开发建设
- 施工现场点位校准
- 高程建模分析
- 测量基础设施保护运维。
本服务为用户提供了一种无需登录SCIMS Online即可获取州级控制测量数据的替代方案，可直接集成至各类GIS软件包中。请注意：SCIMS Online是获取地籍测量所需州级控制测量数据的官方渠道，其具备完整的法律溯源性。用户可通过新南威尔士州空间门户访问SCIMS Online。

### 初始发布日期
2020年1月8日
### 数据时效性
3000年1月1日
### 数据更新频率
其他
### 数据来源
数据提供方原始文件
### 文件类型
ESRI文件地理数据库（*.gdb）
### 归因声明
© 新南威尔士州政府（空间服务部，新南威尔士州客户服务厅业务单元）。最新官方信息请访问 spatial.nsw.gov.au

### 数据主题、分类或与其他数据集的关联
基础空间数据框架（FSDF）下的NSW定位主题
### 精度说明
本数据集依据澳大利亚国家测绘委员会1975年发布的《地图精度标准》，采用各比例尺下的最优数据源进行采集，比例尺覆盖范围为1:500至1:250000。根据该标准，90%的明确定位点的位置误差在对应地图比例尺下的0.5毫米范围内，具体换算关系如下：
1:500比例尺对应0.25米，1:2000对应1米，1:4000对应2米，1:25000对应12.5米，1:50000对应25米，1:100000对应50米。
目前一项用于提升数据空间位置精度与点位准确性的升级计划正在持续推进中。
本数据集依据测量标志的官方GDA2020坐标标注其空间位置。各测量标志的点位精度将在对应数据字段中明确注明，且不同标志的精度存在个体差异。随着新增观测数据的录入与测量平差工作的完成，单个测量标志的精度参数将随时间发生动态变化。

如需获取更多详细信息，请通过空间服务客户中心联系我们。
### 数据集空间参考系统
GDA2020
### 网络服务空间参考系统
其他
### WGS 84等效基准
GDA2020
### 空间覆盖范围
全州范围
### 数据谱系
如需获取更多详细信息，请通过空间服务客户中心联系我们。
### 数据分类
非机密
### 数据访问政策
开放访问
### 数据质量
优秀。相关方法学与精度标准依据新南威尔士州测量总监发布的官方指令制定。如需获取更多详细信息，请通过空间服务客户中心联系我们。
### 条款与条件
知识共享（Creative Commons）
### 标准与规范
符合开放地理空间联盟（OGC）标准，可兼容主流GIS平台进行数据消费。本网络服务依据新南威尔士州空间服务部项目规范开发完成。
### 数据保管方
新南威尔士州客户服务厅空间服务部
地址：346 Panorama Avenue, Bathurst NSW 2795
### 联系人
如需获取更多详细信息，请通过空间服务客户中心联系我们。
### 数据聚合方
新南威尔士州客户服务厅空间服务部
地址：346 Panorama Avenue, Bathurst NSW 2795
### 数据分发方
新南威尔士州客户服务厅空间服务部
地址：346 Panorama Avenue, Bathurst NSW 2795
### 附加支持信息
数据字典