TopoBathy

This World Elevation TopoBathy service combines topography (land elevation) and bathymetry (water depths) from various authoritative sources from across the globe. Heights are orthometric (sea level = 0), and bathymetric values are negative downward from sea level. The source data of land elevation in this service is same as in the Terrain layer. When possible, the water areas are represented by the best available bathymetry. Height/Depth units: Meters Update Frequency: Quarterly Coverage: World/Global Data Sources: This layer is compiled from a variety of best available sources from several data providers. To see the coverage and extents of various datasets comprising this service in an interactive map, see World Elevation Coverage Map. What can you do with this layer? Use for Visualization: This layer is generally not optimal for direct visualization. By default, 32 bit floating point values are returned, resulting in higher bandwidth requirements. Therefore, usage should be limited to applications requiring elevation data values. Alternatively, client applications can select additional functions, applied on the server, that return rendered data. For visualizations such as hillshade or elevation tinted hillshade, consider using the appropriate server-side function defined on this service. Use for Analysis: Yes. This layer provides data as floating point elevation values suitable for use in analysis. There is a limit of 5000 rows x 5000 columns. NOTE: This image services combine data from different sources and resample the data dynamically to the requested projection, extent and pixel size. For analyses using ArcGIS Pro, it is recommended to filter a dataset, specify the projection, extent and cell size using the Make Image Server Layer geoprocessing tool. The extent is factor of cell size and rows/columns limit. e.g. if cell size is 10 m, the max extent for analysis would be less than 50,000 m x 50,000 m. Server Functions: This layer has server functions defined for the following elevation derivatives. In ArcGIS Pro, server function can be invoked from Layer Properties - Processing Templates. Slope Degrees Slope Percentage Hillshade Multi-Directional Hillshade Elevation Tinted Hillshade Slope Map Mosaic Method: This image service uses a default mosaic method of "By Attribute”, using Field "Best" and target of 0. Each of the rasters has been attributed with ‘Best’ field value that is generally a function of the pixel size such that higher resolution datasets are displayed at higher priority. Other mosaic methods can be set, but care should be taken as the order of the rasters may change. Where required, queries can also be set to display only specific datasets such as only NED or the lock raster mosaic rule used to lock to a specific dataset. Accuracy: Accuracy will vary as a function of location and data source. Please refer to the metadata available in the layer, and follow the links to the original sources for further details. An estimate of CE90 and LE90 is included as attributes,where available. This layer allows query, identify, and export image requests. The layer is restricted to a 5,000 x 5,000 pixel limit in a single request. This layer is part of a larger collection of elevation layers that you can use to perform a variety of mapping and analysis tasks. Disclaimer: Bathymetry data sources are not to be used for navigation/safety at sea.本全球高程-水深地形服务整合了全球范围内各权威渠道的地形（Topography）与水深测量（Bathymetry）数据，其中地形数据对应陆地高程，水深测量数据对应水下深度。高程采用正交高程基准（海面高程设为0），水深测量值以海面为基准向下为负。本服务中的陆地高程数据源与Terrain图层一致。在条件允许的情况下，水域区域将采用当前最优的水深测量数据进行表征。 高程/水深单位：米 更新频率：季度更新 覆盖范围：全球 数据来源：本图层由多家数据提供商提供的各类最优数据源整合而成。若需在交互式地图中查看构成该服务的各数据集的覆盖范围与范围，请参阅《World Elevation Coverage Map》（全球高程覆盖地图）。 本图层的应用场景： 1. 可视化应用：本图层通常不适用于直接可视化。默认情况下，服务将返回32位浮点型数值，这会导致更高的带宽占用需求，因此仅建议在需要获取高程数值的应用中使用。或者，客户端应用可调用服务端提供的附加功能以获取渲染后的数据。若需制作晕渲图（Hillshade）或高程着色晕渲图（Elevation Tinted Hillshade）等可视化成果，建议使用本服务中定义的对应服务端功能。 2. 分析应用：支持分析场景。本图层以浮点型高程数值的形式提供数据，适用于各类分析任务。但单次分析的行列数上限为5000行×5000列。 注意：本影像服务整合了多源数据，并会根据请求的投影、范围与像素尺寸动态重采样数据。若使用ArcGIS Pro进行分析，建议通过Make Image Server Layer（生成影像服务器图层）地理处理工具对数据集进行过滤，并指定投影、范围与像元尺寸。分析范围与像元尺寸及行列数限制相关：例如，若像元尺寸为10米，则单次分析的最大范围应小于50000米×50000米。 服务端功能：本图层针对以下高程衍生产品定义了服务端功能： - 坡度（Slope，以度为单位） - 坡度百分比（Slope Percentage） - 晕渲图（Hillshade） - 多方向晕渲图（Multi-Directional Hillshade） - 高程着色晕渲图（Elevation Tinted Hillshade） - 坡度图（Slope Map） 镶嵌方法：本影像服务默认采用“按属性”（By Attribute）镶嵌方法，使用"Best"字段作为属性字段，目标值为0。每个栅格均已被赋予"Best"字段值，该值通常为像元尺寸的函数，以确保高分辨率数据集拥有更高的显示优先级。用户也可设置其他镶嵌方法，但需注意栅格的排序可能会发生变化。如有需要，还可通过查询规则仅显示特定数据集，例如仅显示NED数据集，或使用锁定栅格镶嵌规则锁定至特定数据集。 精度：精度会随位置与数据源的不同而变化。请参阅图层中提供的元数据，并跳转至原始数据源链接以获取更多详细信息。若可用，图层属性中将包含CE90与LE90的估算值。本图层支持查询、识别与影像导出请求。单次请求的像素上限为5000×5000。本图层隶属于更庞大的高程图层集合，可用于执行各类制图与分析任务。 免责声明：本服务中的水深测量数据不得用于海上航行与海上安全相关用途。