Multispectral Landsat

This layer includes Landsat GLS, Landsat 8, and Landsat 9 imagery for use in visualization and analysis. This layer is time enabled and includes a number band combinations and indices rendered on demand. The Landsat 8 and 9 imagery includes nine multispectral bands from the Operational Land Imager (OLI) and two bands from the Thermal Infrared Sensor (TIRS). 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. This layer also includes imagery from the Global Land Survey* (circa 2010, 2005, 2000, 1990, 1975). 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 ‘Layer Filter’ to restrict the default layer display to a specified image or group of images. To isolate a specific mission, use the Layer Filter and the dataset_id or SensorName fields. Visual Rendering The default rendering in this layer is Agriculture (bands 6,5,2) with Dynamic Range Adjustment (DRA). Brighter green indicates more vigorous vegetation. The DRA version of each layer enables visualization of the full dynamic range of the images. Rendering (or display) of band combinations and calculated indices is done on-the-fly from the source images via Raster Functions. Various pre-defined Raster Functions can be selected or custom functions can be created. Pre-defined functions: Natural Color with DRA, Agriculture with DRA, Geology with DRA, Color Infrared with DRA, Bathymetric with DRA, Short-wave Infrared with DRA, Normalized Difference Moisture Index Colorized, NDVI Raw, NDVI Colorized, NBR Raw 15 meter Landsat Imagery Layers are also available: Panchromatic and Pansharpened. Multispectral Bands Band Description Wavelength (µm) Spatial Resolution (m) 1 Coastal aerosol 0.43 - 0.45 30 2 Blue 0.45 - 0.51 30 3 Green 0.53 - 0.59 30 4 Red 0.64 - 0.67 30 5 Near Infrared (NIR) 0.85 - 0.88 30 6 SWIR 1 1.57 - 1.65 30 7 SWIR 2 2.11 - 2.29 30 8 Cirrus (in OLI this is band 9) 1.36 - 1.38 30 9 QA Band (available with Collection 1)* NA 30 *More about the Quality Assessment Band TIRS Bands Band Description Wavelength (µm) Spatial Resolution (m) 10 TIRS1 10.60 - 11.19 100 * (30) 11 TIRS2 11.50 - 12.51 100 * (30) *TIRS bands are acquired at 100 meter resolution, but are resampled to 30 meter in delivered data product. 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. *The Global Land Survey includes images from Landsat 1 through Landsat 7. Band numbers and band combinations differ from those of Landsat 8, but have been mapped to the most appropriate band as in the above table. For more information about the Global Land Survey, visit GLS.本图层包含陆地卫星全球土地调查（Landsat GLS）、陆地卫星8号（Landsat 8）及陆地卫星9号（Landsat 9）影像，用于可视化与分析工作。本图层支持时间维度检索，并包含多种按需渲染的波段组合与指数产品。 陆地卫星8号与9号影像包含来自运行陆地成像仪（Operational Land Imager, OLI）的9个多光谱波段，以及来自热红外传感器（Thermal Infrared Sensor, TIRS）的2个波段。本图层每日更新，新增影像直接取自美国地质调查局（U.S. Geological Survey, USGS）托管于亚马逊云服务（Amazon Web Services, AWS）的陆地卫星数据集。 **地理覆盖范围**：全球陆地表面。极地区域可通过极地投影影像图层访问：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**：本图层每日更新新增影像。陆地卫星8号与9号协同工作，每8天可覆盖地球陆地表面任意一点。本图层包含2015年1月至今采集的绝大多数影像，同时也收录了2013至2014年间每个轨道路径/行号对应的约5景影像。此外，本图层还包含全球土地调查（Global Land Survey, GLS）的历史影像，采集时间约为2010年、2005年、2000年、1990年及1975年。 **产品级别**：本图层中的陆地卫星8号与9号影像采用Collection 2 Level-1数据格式。所有影像均已完成大气顶（Top of Atmosphere, TOA）校正，校正使用美国地质调查局提供的辐射定标系数完成。默认取值范围为0~1的大气顶反射率值被缩放至0~10000区间。 **图像选择与过滤**：本图层支持通过多个字段进行筛选，包括采集日期、预估云量及产品ID。若需提取并处理特定影像，可通过「图像过滤器」创建自定义图层，或添加「图层过滤器」将默认图层显示限制为指定单景或一组影像。若需单独筛选特定任务的影像，可使用图层过滤器结合dataset_id或SensorName字段完成。 **可视化渲染**：本图层的默认渲染方案为农业专用渲染（采用波段6、5、2组合）并启用动态范围调整（Dynamic Range Adjustment, DRA），色调越鲜亮的绿色代表植被长势越旺盛。启用动态范围调整的图层可完整展现影像的全部动态范围。波段组合与计算指数的渲染（或显示）均通过栅格函数（Raster Functions）从源影像实时生成。用户可选择多种预定义栅格函数，或自定义创建渲染函数。预定义渲染函数包括：带动态范围调整的自然色、带动态范围调整的农业专用渲染、带动态范围调整的地质专用渲染、带动态范围调整的假彩色红外、带动态范围调整的水深渲染、带动态范围调整的短波红外、着色版归一化植被水分指数、原始归一化植被指数（Normalized Difference Vegetation Index, NDVI Raw）、着色版归一化植被指数（NDVI Colorized）、原始归一化燃烧比指数（Normalized Burn Ratio, NBR Raw）。此外本图层还提供15米分辨率陆地卫星影像图层：全色影像与全色锐化影像。 **多光谱波段** | 波段编号 | 波段描述 | 波长范围(μm) | 空间分辨率(m) | | --- | --- | --- | --- | | 1 | 海岸气溶胶波段 | 0.43 - 0.45 | 30 | | 2 | 蓝光波段 | 0.45 - 0.51 | 30 | | 3 | 绿光波段 | 0.53 - 0.59 | 30 | | 4 | 红光波段 | 0.64 - 0.67 | 30 | | 5 | 近红外波段(NIR) | 0.85 - 0.88 | 30 | | 6 | 短波红外1(SWIR 1) | 1.57 - 1.65 | 30 | | 7 | 短波红外2(SWIR 2) | 2.11 - 2.29 | 30 | | 8 | 卷云波段（OLI中对应波段9） | 1.36 - 1.38 | 30 | | 9 | 质量评估波段（Collection 1版本可用）* | 无数据 | 30 | *更多关于质量评估波段的信息请参考相关文档。 **热红外传感器(TIRS)波段** | 波段编号 | 波段描述 | 波长范围(μm) | 空间分辨率(m) | | --- | --- | --- | --- | | 10 | TIRS1 | 10.60 - 11.19 | 100* (30) | | 11 | TIRS2 | 11.50 - 12.51 | 100* (30) | *TIRS波段原始采集分辨率为100米，但在交付的数据产品中已重采样至30米。 **额外使用说明**：单次影像导出请求限制为4000列×4000行以内。本动态影像图层可应用于Web地图与ArcGIS Pro软件，同时也可通过ArcGIS REST API集成至网页及移动应用中。本图层支持Web覆盖服务（Web Coverage Service, WCS）与Web地图服务（Web Map Service, WMS），可作为WCS或WMS服务进行调用。陆地卫星浏览器应用（Landsat Explorer App）是另一款可用于访问与探索本影像数据的工具。 **数据源**：陆地卫星影像数据来自美国地质调查局（U.S. Geological Survey, USGS）与美国国家航空航天局（National Aeronautics and Space Administration, NASA），数据托管于亚马逊云服务的公共数据集项目中。更多信息请参考陆地卫星8号与陆地卫星9号相关文档。*全球土地调查（GLS）数据集包含陆地卫星1号至7号的影像，其波段编号与波段组合与陆地卫星8号存在差异，但已映射至上表中最匹配的波段。如需了解全球土地调查的更多信息，请访问GLS相关页面。