NSW Elevation and Depth Theme

Export Data Access API Access 5m DEM Service Access NSW Elevation Service Access ELVIS PlatformNSW Elevation and Depth ThemePlease NoteWGS 84 service aligned to GDA94This dataset has spatial reference [WGS 84 ≈ GDA94] which may result in misalignments when viewed in GDA2020 environments. A similar service with a ‘multiCRS’ suffix is available which can support GDA2020, GDA94 and WGS 84 ≈ GDA2020 environments.In due course, and allowing time for user feedback and testing, it is intended that the original service name will adopt the new 'multiCRS' functionality.\n\nMetadata Portal Metadata InformationContent TitleNSW Elevation and Depth ThemeContent TypeHosted Feature LayerDescriptionElevation and Depth is the measurement of the Earth’s surface above or below a vertical datum to obtain the height of the land. Data is collected using a range of sensors including: laser, sonar, radar and optical.Technical methodologies are used to derive spot heights, raster surfaces, contours, triangulated irregular networks and digital elevation models.Datasets that form the Elevation and Depth theme include: Historical Contours (2m Urban, 10m and 20m)Current 2m Contours (State wide)Spot HeightsRelative HeightsPoint cloud (LiDAR and Photogrammetrically derived) (available for download from Geoscience Australia ELVIS Platform)Digital Elevation Model (available for download from Geoscience    Australia ELVIS Platform) Elevation Data Sets available from additional services.ELVIS – Elevation and DepthPoint Clouds - The point cloud data set consists of point clouds captured from LiDAR (Light Detection and Ranging) and derived from airborne imagery using photogrammetric techniques. Spatial Services Point Cloud data is available for on demand download from Geoscience Australia ELVIS Platform. Digital Elevation Models - Digital Elevation Models (DEM) are derived from Spatial Services’ (SS) point cloud data. The DEM is a bare earth representation of the earth’s surface where all the above ground feature has been removed.Spatial Services have a number of different Digital Elevation Models Digital Elevation Model derived from LiDAR - Are 1m or 2m resolution and is not hydrologically enforced(breaklines) or hydrologically conditioned (identification and analysis of sinks).Digital Elevation Model derived Photogrammetry - Data is 5m resolution. Areas of no data caused by steep slopes, shadow and vegetation have been interpolated or filled-in with another data source and will not be as accurate as the bare open ground areas. The data is not hydrologically enforced (breaklines) or hydrologically conditioned (identification and analysis of sinks).Spatial Services Digital Elevation Model data is available for on demand download from. Geoscience Australia ELVIS Platform as 2km x 2km tiles. You can also access the 5 Metre Digital Elevation Model Service in the Collaboration Portal.Elevation and Depth provides an accurate representation of the Earth’s surface enabling evidence-based decision making, 3D modelling, planning and earth surface representation.Elevation and Depth underpins:Safe hydrographicAeronautical and road navigationClimate science, including climate change adaptationEmergency management and natural hazard risk assessmentEnvironmental, including water managementEngineering projects and infrastructure developmentDefinition of maritime and administrative boundariesNatural resource exploration.Update frequencies vary for each dataset. Individual current status can be found under each Spatial data profile. The objective is to maintain elevation datasets to meet the FDSI requirements of key data users.Current programs include:Aerial LiDAR capture program across NSW.DEM and Point Cloud generation from photogrammetric techniques.Longer term programs include:Update of contour data using updated DEM data generated from LiDAR and Photogrammetry.Hydrological enforcement using improved surface models.Initial Publication Date05/04/2020Data 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 Elevation and Depth 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.  Spatial Reference System (dataset)GDA94Spatial Reference System (web service)EPSG:3857WGS84 Equivalent ToGDA94Spatial ExtentFull StateContent LineageFor additional information, please contact us via the Spatial Services Customer HubData ClassificationUnclassifiedData Access PolicyOpenData QualityFor additional information, please contact us via the Spatial Services Customer HubTerms and ConditionsCreative CommonsStandard and SpecificationAS/NZS ISO 19115 - ANZLIC Metadata Profile Version 1.1AS/NZS ISO 19131:2008 Geographic Information - Data product specificationsOGC compliant Web Map Services (WMS) and Web Feature Services (WFS)Metadata for the relevant Spatial Services datasets complies with AS/NZS ISO 19115-2, ANZLIC Metadata Profile v1.1 and ISO 19139 Intergovernmental Committee on Surveying and Mapping (ICSM): Guidelines for Digital Elevation DataDCS Spatial Services: Elevation Data Products Specification and Description (LiDAR)DCS Spatial Services: Elevation Data Products Specification and Description (Airborne Photogrammetry)  Data CustodianDCS Spatial Services346 Panorama Ave Bathurst NSW 2795Point of ContactPlease contact us via the Spatial Services Customer HubData AggregatorDCS Spatial Services346 Panorama Ave Bathurst NSW 2795Data DistributorDCS Spatial Services346 Panorama Ave Bathurst NSW 2795Additional Supporting InformationData DictionariesTRIM Number

【导出数据访问API、5米数字高程模型（Digital Elevation Model, DEM）服务访问、新南威尔士州高程服务访问及ELVIS平台】新南威尔士州高程与深度数据集
请注意：本世界大地测量系统1984（World Geodetic System 1984, WGS 84）服务适配澳大利亚大地测量系统1994（Geocentric Datum of Australia 1994, GDA94）。本数据集的空间参考为[WGS 84 ≈ GDA94]，在GDA2020（澳大利亚大地测量系统2020）环境中查看时可能出现对齐偏差。另有带“multiCRS”后缀的同类服务，可支持GDA2020、GDA94及WGS 84 ≈ GDA2020环境。待收集用户反馈并完成测试后，计划将原服务升级为具备该多坐标参考系统功能的新版本。

## 元数据门户元数据信息
### 内容标题
新南威尔士州高程与深度数据集
### 内容类型
托管要素图层
### 内容描述
高程与深度是对地球表面相对于垂直基准面的高度测量，用于获取陆地高程。数据通过激光、声呐、雷达及光学等多种传感器采集。通过专业技术方法可生成高程点、栅格表面、等高线、不规则三角网及数字高程模型。
组成高程与深度主题的数据集包括：
- 历史等高线（2米城区、10米及20米分辨率）
- 当前2米分辨率全域等高线
- 高程点
- 相对高程
- 点云（激光雷达（Light Detection and Ranging, LiDAR）及摄影测量生成，可从澳大利亚地球科学局ELVIS平台下载）
- 数字高程模型（可从澳大利亚地球科学局ELVIS平台下载）
- 其他服务提供的高程数据集

### ELVIS——高程与深度点云
点云数据集包含通过激光雷达采集，以及通过摄影测量技术从航空影像衍生的点云数据。点云数据可从澳大利亚地球科学局ELVIS平台按需下载。

### 数字高程模型
数字高程模型（DEM）由空间服务（Spatial Services, SS）的点云数据衍生而来，是移除所有地表物体后的裸地球面表达。空间服务提供多种不同类型的数字高程模型：
1. 激光雷达衍生DEM：分辨率为1米或2米，未进行水文地形断裂线处理或水文校正（即洼地识别与分析）。
2. 摄影测量衍生DEM：分辨率为5米。因陡坡、阴影及植被导致的无数据区域已通过插值或其他数据源填充，其精度不及裸露开阔地面区域。该数据未进行水文地形断裂线处理或水文校正。
空间服务的数字高程模型数据以2km×2km瓦片形式，可从澳大利亚地球科学局ELVIS平台按需下载。您也可在协作门户中访问5米数字高程模型服务。

### 应用场景
高程与深度可精准呈现地球表面，支持循证决策、三维建模、规划及地表可视化。其支撑以下领域：
- 安全水文作业
- 航空与道路导航
- 气候科学，包括气候变化适应
- 应急管理与自然灾害风险评估
- 环境管理，包括水资源管理
- 工程项目与基础设施建设
- 海洋与行政边界界定
- 自然资源勘探

各数据集的更新频率各不相同，各空间数据档案中可查看当前状态。本项目目标是维护高程数据集以满足关键数据用户的基础空间数据框架（Foundation Spatial Data Framework, FSDF）要求。

当前实施项目包括：
- 新南威尔士州全域航空激光雷达采集项目
- 通过摄影测量技术生成DEM与点云数据
长期规划项目包括：
- 利用激光雷达及摄影测量生成的更新DEM数据更新等高线数据
- 利用改进的地表模型进行水文增强

### 元数据详细信息
- 首次发布日期：2020年4月5日
- 数据时效性：3000年1月1日
- 数据更新频率：其他
- 数据来源：数据提供方文件
- 文件类型：ESRI文件地理数据库（*.gdb）
- 归因说明：© 新南威尔士州政府（空间服务部，新南威尔士州客户服务厅下属业务单元）。最新信息请访问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）下的新南威尔士州高程与深度数据集
- 精度说明：本数据集采用澳大利亚国家测绘委员会1975年《地图精度标准》中规定的多种比例尺与精度等级的现有最优数据源采集，比例尺范围为1:500至1:250000。因此，90%的明确特征点的位置误差在对应地图比例尺的0.5mm范围内，即：1:500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。当前正在开展项目以提升数据的空间位置与精度。
- 数据集空间参考系统：GDA94
- Web服务空间参考系统：EPSG:3857（WGS84等效适配GDA94）
- 空间范围：全州范围
- 数据谱系：如需更多信息，请通过空间服务客户中心联系我们
- 数据分类：非保密
- 数据访问政策：开放获取
- 数据质量说明：如需更多信息，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）标准协议
- 标准与规范：
1. AS/NZS ISO 19115 - ANZLIC元数据概要版本1.1
2. AS/NZS ISO 19131:2008 地理信息——数据产品规范
3. 符合开放地理空间联盟（Open Geospatial Consortium, OGC）标准的网络地图服务（Web Map Service, WMS）与网络要素服务（Web Feature Service, WFS）
相关空间服务数据集的元数据符合AS/NZS ISO 19115-2、ANZLIC元数据概要v1.1及ISO 19139标准，同时遵循澳大利亚测量与制图政府间委员会（ICSM）《数字高程数据指南》、DCS空间服务《高程数据产品规范与说明（激光雷达）》及DCS空间服务《高程数据产品规范与说明（航空摄影测量）》。
- 数据保管人：DCS空间服务，地址：346 Panorama Ave, Bathurst NSW 2795
- 联系人：请通过空间服务客户中心联系我们
- 数据聚合方：DCS空间服务，地址：346 Panorama Ave, Bathurst NSW 2795
- 数据分发方：DCS空间服务，地址：346 Panorama Ave, Bathurst NSW 2795
- 附加支持信息：数据字典、TRIM编号