Panchromatic Landsat

This layer includes Landsat 8 and 9 imagery for use in visualization and analysis. This layer is time enabled and includes the panchromatic band from the Operational Land Imager (OLI). It is updated daily with new imagery directly sourced from the USGS Landsat collection on AWS. Geographic Coverage Global Land Surface Polar regions are available in polar-projected Imagery Layers: Landsat Arctic Views and Landsat Antarctic Views. Temporal Coverage This layer is updated daily with new imagery. Working in tandem, Landsat 8 and 9 revisit each point on Earth's land surface every 8 days. Most images collected from January 2015 to present are included. Approximately 5 images for each path/row from 2013 and 2014 are also included. Product Level The Landsat 8 and 9 imagery in this layer is comprised of Collection 2 Level-1 data. The imagery has Top of Atmosphere (TOA) correction applied. TOA is applied using the radiometric rescaling coefficients provided the USGS. The TOA reflectance values (ranging 0 – 1 by default) are scaled using a range of 0 – 10,000. Image Selection/Filtering A number of fields are available for filtering, including Acquisition Date, Estimated Cloud Cover, and Product ID. To isolate and work with specific images, either use the ‘Image Filter’ to create custom layers or add a ‘Query Filter’ to restrict the default layer display to a specified image or group of images. Visual Rendering Default rendering is Panchromatic (0.5-0.68 µm). Raster Functions enable on-the-fly rendering of band combinations and calculated indices from the source imagery. The DRA version of each layer enables visualization of the full dynamic range of the images. Other pre-defined Raster Functions can be selected via the renderer drop-down or custom functions can be created. This layer is part of a larger collection of Landsat Imagery Layers that you can use to perform a variety of mapping analysis tasks. Additional Usage Notes Image exports are limited to 4,000 columns x 4,000 rows per request. This dynamic imagery layer can be used in Web Maps and ArcGIS Pro as well as web and mobile applications using the ArcGIS REST APIs. WCS and WMS compatibility means this imagery layer can be consumed as WCS or WMS services. The Landsat Explorer App is another way to access and explore the imagery. Data Source Landsat imagery is sourced from the U.S. Geological Survey (USGS) and the National Aeronautics and Space Administration (NASA). Data is hosted in Amazon Web Services as part of their Public Data Sets program. For information, see Landsat 8 and Landsat 9.本图层包含陆地卫星8号（Landsat 8）与陆地卫星9号（Landsat 9）影像，可用于可视化与分析工作。本图层支持时间维度检索，并包含陆地成像仪（Operational Land Imager, OLI）的全色波段。该图层每日更新，新影像直接取自美国地质调查局（USGS）在亚马逊云服务（AWS）上的陆地卫星数据集馆藏。 地理覆盖范围：全球陆地表面。极地区域可通过极坐标投影影像图层获取：陆地卫星北极视图（Landsat Arctic Views）与陆地卫星南极视图（Landsat Antarctic Views）。 时间覆盖范围：本图层每日更新新影像。陆地卫星8号与9号协同工作，可每8天重访地球陆地表面的任意点位。本图层涵盖2015年1月至今采集的绝大多数影像，同时也包含2013至2014年间每个轨道路径与行号（path/row）对应的约5景影像。 产品级别：本图层中的陆地卫星8号与9号影像采用第二版（Collection 2）一级（Level-1）数据。所有影像均已完成大气顶层（Top of Atmosphere, TOA）校正，校正使用美国地质调查局（USGS）提供的辐射定标系数。大气顶层反射率数值默认范围为0至1，现按0至10000的区间进行缩放。 影像选择与过滤：支持通过多个字段进行过滤，包括采集日期、估算云量与产品ID。若需筛选并处理特定影像，可使用"Image Filter"创建自定义图层，或添加"Query Filter"将默认图层的显示范围限定为指定单景或多景影像。 可视化渲染：默认渲染模式为全色波段（0.5-0.68 µm）。栅格函数（Raster Functions）支持对源影像的波段组合与计算指数进行实时渲染。各图层的动态范围调整（Dynamic Range Adjustment, DRA）版本可实现影像全动态范围的可视化。用户可通过渲染器下拉菜单选择其他预定义栅格函数，也可自行创建自定义函数。本图层隶属于更广泛的陆地卫星影像图层集合，可用于开展各类制图与分析任务。 额外使用说明：单次影像导出请求的最大尺寸限制为4000列×4000行。该动态影像图层可应用于网页地图与ArcGIS Pro软件，也可通过ArcGIS REST API集成至网页与移动应用中。本图层支持网络覆盖服务（Web Coverage Service, WCS）与网络地图服务（Web Map Service, WMS）协议，可作为WCS或WMS服务进行调用。陆地卫星资源管理器应用（Landsat Explorer App）是另一种访问与探索该影像的途径。 数据源：陆地卫星影像源自美国地质调查局（USGS）与美国国家航空航天局（National Aeronautics and Space Administration, NASA），数据以公共数据集项目的形式托管于亚马逊云服务（AWS）。如需了解更多信息，请参阅陆地卫星8号与陆地卫星9号相关文档。