Google Earth Engine ——Sentinel1/2/3/5p 影像集合介绍

本教程讲述了Landsat系列和使用图像所需的相关质量信息。 

This chapter provides an overview of the Landsat collections and relevant quality information necessary for using the imagery.

​​Sentinel​​ platform.

Sentinel-1​​¶​​

​​Sentinel-1​​ collection.

Short name: Sentinel-1 SAR GRD: C-band Synthetic Aperture Radar

• Sentinel-1 SAR GRD: C-band Synthetic Aperture Radar Ground Range Detected, log scaling

Sentinel-2​​¶​​

​​Sentinel-2​​ collection.

Short name: Sentinel-2 MSI: Multispectral Instrument

• Sentinel-2 MSI: MultiSpectral Instrument, Level-2A
• Sentinel-2 MSI: MultiSpectral Instrument, Level-1C

Specifications and Quality​​¶​​

The Sentinel-2 MSI ​​user guide​​​, ​​user handbook​​​, and ​​technical guide​​ provide overview of the products and algorithms within the platform.

Specific to the Level-2A processing, the ​​Level-2 Algorithm Overview​​ provides additional information about Scene Classification (SC) and Atmospheric Correction (S2A2).

The Sentinel-2 MSI ​​data quality reports (DQRs)​​ provide regular updates about the geometric and radiometric performance of the data products.

Scene Classification Band​​¶​​

Table 13 Sentinel-2 MSI Scene Classification Values

​​¶​​

Value	Classification
No Data
1	Saturated or Defective
2	Dark Area Pixels
3	Cloud Shadows
4	Vegetation
5	Not Vegetated
6	Water
7	Unclassified
8	Medium Probability Cloud
9	High Probability Cloud
10	Thin Cirrus
11	Snow

Quality Bands​​¶​​

Table 14 Sentinel-2 MSI Quality Bands

​​¶​​

Band	Description
MSK_CLDPRB	Cloud Probability Map
MSK_SNWPRB	Snow Probability Map
QA60	Cloud Mask

Table 15 Sentinel-2 MSI Cloud Mask Bit Index

​​¶​​

Bit	Attribute
10	Opaque Clouds 0 = No Opaque Clouds 1 = Opaque Clouds
11	Cirrus Clouds 0 = No Cirrus Clouds 1 = Cirrus Clouds

Sentinel-3​​¶​​

​​Sentinel-3​​ collection.

• Sentinel-3 OLCI EFR: Ocean and Land Color Instrument Earth Observation Full Resolution

Sentinel-5P​​¶​​

• Sentinel-5P OFFL AER AI: Offline UV Aerosol Index
• Sentinel-5P OFFL CLOUD: Near Real-Time Cloud
• Sentinel-5P OFFL CO: Offline Carbon Monoxide
• Sentinel-5P OFFL HCHO: Offline Formaldehyde
• Sentinel-5P OFFL NO2: Offline Nitrogen Dioxide
• Sentinel-5P OFFL O3: Offline Ozone
• Sentinel-5P OFFL SO2: Offline Sulphur Dioxide
• Sentinel-5P OFFL CH4: Offline Methane