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 |
