Google Earth Engine ——Landsat 8 影像集合Collection详细介绍

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

本章概述了Landsat8系列和使用图像所需的相关质量信息。

Landsat platform.

Landsat processing tiers.

Landsat 8¶

Landsat 8 collection.

Surface Reflectance (SR)¶

USGS Landsat 8 Surface Reflectance Tier 1
USGS Landsat 8 Surface Reflectance Tier 2

Top of Atmosphere (TOA)¶

USGS Landsat 8 Collection 1 Tier 1 TOA Reflectance
USGS Landsat 8 Collection 1 Tier 1 and Real-Time data TOA Reflectance
USGS Landsat 8 Collection 1 Tier 2 TOA Reflectance

Raw Images¶

USGS Landsat 8 Collection 1 Tier 1 Raw Scenes
USGS Landsat 8 Collection 1 Tier 1 and Real-Time data Raw Scenes
USGS Landsat 8 Collection 1 Tier 2 Raw Scenes

Derived Datasets¶

Burned Area Index (BAI)
Enhanced Vegetation Index (EVI)
Normalized Difference Vegetation Index (NDVI)
Normalized Burn Ratio Thermal (NBRT)
Normalized Difference Snow Index (NDSI)
Normalized Difference Water Index (NDWI)

Specifications and Quality¶

Section 6 of the Landsat 8 Collection 1 (C1) Land Surface Reflectance Code (LaSRC) product guide provides information related to the SR specifications as well to the data quality measurements.

Surface Reflectance Specifications¶

Table 1 Surface Reflectance Specifications ¶

Band Designation	Band Name	Data Type	Units	Range	Valid Range	Fill Value	Saturate Value	Scale Factor
ProductID_sr_band1	Band 1	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band2	Band 2	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band3	Band 3	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band4	Band 4	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band5	Band 5	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band6	Band 6	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_sr_band7	Band 7	16-Bit Signed Integer	Reflectance	-2000 - 16000	0 - 10000	-9999	20000	0.0001
ProductID_pixel_qa	Level 2 Quality Band	16-Bit Unsigned Integer	Bit Index	0 - 32768	0 - 32768	1 (Bit 0)	NA	NA
ProductID_sr_aerosol	Aerosol QA	8-Bit Unsigned Integer	Bit Index	0 - 255	0 - 255	NA	NA	NA
ProductID_radsat_qa	Radiometric Saturation QA	16-Bit Unsigned Integer	Bit Index	0 - 32768	0 - 32768	1 (Bit 0)	NA	NA
ProductID_MTL.txt	Level 1 Metadata File	NA	NA	NA	NA	NA	NA	NA
ProductID_ANG.txt	Level 1 Angle Coefficient File	NA	NA	NA	NA	NA	NA	NA

Pixel Quality Assessment (QA) Band¶

Table 2 Landsat 8 Pixel Quality Assessment Bit Index ¶

Bit	Bit Value	Cumulative Sum	Attribute
0	1	1	Fill
1	2	3	Clear
2	4	7	Water
3	8	15	Cloud Shadow
4	16	31	Snow
5	32	63	Cloud
6-7	64 / 128	127 / 255	Cloud Confidence 00 (0) = None 01 (1) = Low 10 (2) = Medium 11 (3) = High
8-9	256 / 512	511 / 1023	Cirrus Confidence 00 (0) = Not Set 01 (1) = Low from OLI Band 9 Reflectance 10 (2) = Medium from OLI Band 9 Reflectance (Not Used) 11 (3) = High from OLI Band 9 Reflectance
10	1024	2047	Terrain Occlusion
11	2048	4095	Unused
12	4096	8191	Unused
13	8192	16383	Unused
14	16384	32767	Unused
15	32768	655535	Unused

Table 3 Landsat 8 Pixel Quality Assessment Values ¶

Attribute	Pixel Value
Fill	1
Clear	322, 386, 834, 898, 1346
Water	324, 388, 836, 900, 1348
Cloud Shadow	328, 392, 840, 904, 1350
Snow/Ice	336, 368, 400, 432, 848, 880, 912, 944, 1352
Cloud	352, 368, 416, 432, 480, 864, 880, 928, 944, 992
Low Confidence Cloud	322, 324, 328, 336, 352, 368, 834, 836, 840, 848, 864, 880
Medium Confidence Cloud	386, 388, 392, 400, 416, 432, 898, 900, 904, 928, 944
High Confidence Cloud	480, 992
Low Confidence Cirrus	322, 324, 328, 336, 352, 368, 386, 388, 392, 400, 416, 432, 480
High Confidence Cirrus	834, 836, 840, 848, 864, 880,898,900, 904, 912, 928, 944, 992
Terrain Occlusion	1346, 1348, 1350, 135

Radiometric Saturation QA Band¶

Table 4 Landsat 8 Radiometric Saturation Quality Assessment Bit Index ¶

Bit	Bit Value	Cumulative Sum	Description
0	1	1	Data Fill Flag (0 valid data, 1 invalid data)
1	2	3	Band 1 Data Saturation Flag (0 valid data, 1 saturated data)
2	4	7	Band 2 Data Saturation Flag (0 valid data, 1 saturated data)
3	8	15	Band 3 Data Saturation Flag (0 valid data, 1 saturated data)
4	16	31	Band 4 Data Saturation Flag (0 valid data, 1 saturated data)
5	32	63	Band 5 Data Saturation Flag (0 valid data, 1 saturated data)
6	64	127	Band 6 Data Saturation Flag (0 valid data, 1 saturated data)
7	128	255	Band 7 Data Saturation Flag (0 valid data, 1 saturated data)
8	NA	NA	Not Used
9	512	1023	Band 9 Data Saturation Flag (0 valid data, 1 saturated data)
10	1024	2047	Band 10 Data Saturation Flag (0 valid data, 1 saturated data)
11	2048	4095	Band 11 Data Saturation Flag (0 valid data, 1 saturated data)

Surface Reflectance Aerosol Band¶

Table 5 Landsat 8 Internal Surface Reflectance Aerosol Quality Assessment Bit Index ¶

Bit	Bit Value	Cumulative Sum	Attribute
0	1	1	Fill
1	2	3	Valid Aerosol Retrieval（center pixel of 3x3 pixel window)
2	4	7	Water Pixel (or water pixel was used in the fill-the-window interpolation)
3	8	15	Cloud or Cirrus
4	16	31	Cloud Shadow
5	32	63	Non-center window pixel for which aerosol was interpolated from surrounding 3x3 window center pixels
6-7	64 / 128	127 / 255	Aerosol Level 00 (0) = Climatology 01 (1) = Low 10 (2) = Medium 11 (3) = High

Table 6 Landsat 8 Surface Reflectance Aerosol Values ¶

Attribute	Pixel Value
Fill	1
Valid Aerosol Retrieval（center pixel of 3x3 window)	2,66, 130, 194
Water Pixel (or water pixel was used in the fill-the-window interpolation)	4, 68, 100, 132, 164, 196, 228
Cloud or Cirrus	8, 72, 136, 200
Cloud Shadow	16, 80, 144, 208
Non-center window pixel for which aerosol was interpolated from surrounding 3x3 center pixels	32, 96, 100, 160, 164, 224, 228
Low-level aerosol	66, 68, 72, 80, 96, 100
Medium-level aerosol	130, 132, 136, 144, 160, 164
High-level aerosol	194, 196, 200, 208, 224, 228