Google Earth Engine ——LANDSAT 7/LM01/C01/T1Landsat 1 MSS Collection 1 Tier 1 DN值，代表经过缩放、校准的传感器辐射度影像数

Landsat 1 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.

Landsat scenes with the highest available data quality are placed into Tier 1 and are considered suitable for time-series processing analysis. Tier 1 includes Level-1 Precision Terrain (L1TP) processed data that have well-characterized radiometry and are inter-calibrated across the different Landsat sensors. The georegistration of Tier 1 scenes will be consistent and within prescribed tolerances [<=12 m root mean square error (RMSE)]. All Tier 1 Landsat data can be considered consistent and inter-calibrated (regardless of sensor) across the full collection. See more information in the USGS docs.

For more information, see

Landsat 1 MSS Collection 1 Tier 1 DN值，代表经过缩放、校准的传感器辐射度。

具有最高可用数据质量的陆地卫星场景被归入第1级，并被认为适合进行时间序列处理分析。第一级包括一级精确地形（L1TP）处理的数据，这些数据具有良好的辐射测量特性，并在不同的Landsat传感器之间进行了相互校准。第1级场景的地理注册将是一致的，并在规定的公差范围内[<=12米均方根误差（RMSE）]。所有第1级Landsat数据都可以被认为是一致的，并且在整个集合中进行了相互校准（不管是哪个传感器）。参见USGS文档中的更多信息。

更多信息，见Landsat MSS产品信息页

Landsat 1 MSS Collection 1 Tier 2 DN values, representing scaled, calibrated at-sensor radiance.

Scenes not meeting Tier 1 criteria during processing are assigned to Tier 2. This includes Systematic terrain (L1GT) and Systematic (L1GS) processed scenes, as well as any L1TP scenes that do not meet the Tier 1 specifications due to significant cloud cover, insufficient ground control, and other factors. Users interested in Tier 2 scenes can analyze the RMSE and other properties to determine the suitability for use in individual applications and studies. See more information in the USGS docs.

For more information, see Landsat MSS Product Information Page

Landsat 1 MSS Collection 1 Tier 2 DN值，代表经过缩放、校准的传感器辐射度。

在处理过程中不符合第1级标准的场景被分配到第2级。这包括系统地形（L1GT）和系统（L1GS）处理过的场景，以及任何L1TP场景，这些场景由于严重的云层覆盖、地面控制不足和其他因素而不符合第1级规范。对第2级场景感兴趣的用户可以分析RMSE和其他属性，以确定是否适合用于个人应用和研究。更多信息见美国地质调查局的文件。

更多信息，见Landsat MSS产品信息页

Dataset Availability

1972-07-23T00:00:00 - 1978-01-07T00:00:00

Dataset Provider

USGS

Collection Snippet

ee.ImageCollection("LANDSAT/LM01/C01/T1")

Bands Table

使用说明：

Landsat datasets are federally created data and therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction.

Acknowledgement or credit of the USGS as data source should be provided by including a line of text citation such as the example shown below.

(Product, Image, Photograph, or Dataset Name) courtesy of the U.S. Geological Survey

Example: Landsat-7 image courtesy of the U.S. Geological Survey

See the USGS Visual Identity System Guidance for further details on proper citation and acknowledgement of USGS products.

Landsat数据集是联邦创建的数据，因此属于公共领域，可以在没有版权限制的情况下使用、转让或复制。

对美国地质调查局作为数据来源的确认或信用，应通过包括一行文字引用来提供，如下面的例子。

(产品、图像、照片或数据集名称）由美国地质调查局提供。

例子。Landsat-7图像由美国地质调查局提供

请参阅美国地质调查局视觉识别系统指南，了解有关美国地质调查局产品的正确引用和鸣谢的进一步细节。

代码：

var dataset = ee.ImageCollection('LANDSAT/LM01/C01/T1')
                  .filterDate('1974-01-01', '1978-12-31');
var nearInfrared321 = dataset.select(['B6', 'B5', 'B4']);
var nearInfrared321Vis = {};
Map.setCenter(6.746, 46.529, 6);
Map.addLayer(nearInfrared321, nearInfrared321Vis, 'Near Infrared (321)');

代码：

var dataset = ee.ImageCollection('LANDSAT/LM01/C01/T2')
                  .filterDate('1974-01-01', '1978-12-31');
var nearInfrared321 = dataset.select(['B6', 'B5', 'B4']);
var nearInfrared321Vis = {};
Map.setCenter(6.746, 46.529, 6);
Map.addLayer(nearInfrared321, nearInfrared321Vis, 'Near Infrared (321)');

注：有很多影像是缺失的，所以我们只能看运气，拼接的条带和色差非常明显，所以之前的数据很少有人用到。