Google Earth Engine ——Landsat 7 影像集合数据集详细介绍
Landsat 7¶
Landsat 7 collection.
Surface Reflectance¶
-
USGS Landsat 7 Surface Reflectance Tier 1
-
USGS Landsat 7 Surface Reflectance Tier 2
Top of Atmosphere (TOA)¶
-
USGS Landsat 7 Collection 1 Tier 1 TOA Reflectance
-
USGS Landsat 7 Collection 1 Tier 1 and Real-Time data TOA Reflectance
-
USGS Landsat 7 Collection 1 Tier 2 TOA Reflectance
Raw Images¶
-
USGS Landsat 7 Collection 1 Tier 1 Raw Scenes
-
USGS Landsat 7 Collection 1 Tier 1 and Real-Time data Raw Scenes
-
USGS Landsat 7 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 5 of the Landsat 4-7 Collection 1 (C1) Surface Reflectance Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) product guide provides information related to the SR specifications as well to the data quality measurements.
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_sr_atmos_opacity |
Atmospheric Opacity |
16-Bit Signed Integer |
Unitless |
-2000 - 16000 |
0 - 10000 |
-9999 |
NA |
0.0010 |
| ProductID_pixel_qa |
Level 2 Quality Band |
16-Bit Unsigned Integer |
Bit Index |
0 - 32768 |
0 - 32768 |
1 (Bit 0) |
NA |
NA |
| ProductID_radsat_qa |
Radiometric Saturation QA |
16-Bit Unsigned Integer |
Bit Index |
0 - 32768 |
0 - 32768 |
1 (Bit 0) |
NA |
NA |
| ProductID_sr_cloud_qa |
Surface Reflectance Cloud QA |
8-Bit Unsigned Integer |
Bit Index |
0 - 255 |
0 - 63 |
NA |
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 |
Surface Reflectance Cloud Quality Assessment Band¶
| Bit |
Attribute |
|---|---|
| 0 |
Dark Dense Vegetation (DDV) |
| 1 |
Cloud |
| 2 |
Cloud Shadow |
| 3 |
Adjacent to Cloud |
| 4 |
Snow |
| 5 |
Water |
| 6 |
Unused |
| 7 |
Unused |
| Attribute |
Pixel Value |
|---|---|
| DDV |
1, 9 |
| Cloud |
2, 34 |
| Cloud Shadow |
4, 12, 20, 36, 52 |
| Adjacent to Cloud |
8, 12, 24, 40, 56 |
| Snow |
16, 20, 24, 48, 52, 56 |
| Water |
32, 34, 36, 40, 48, 52, 56 |
Pixel Quality Assessment Band¶
| 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 |
| 8 |
256 |
511 |
Unused |
| 9 |
512 |
1023 |
Unused |
| 10 |
1024 |
2047 |
Unused |
| 11 |
2048 |
4095 |
Unused |
| 12 |
4096 |
8191 |
Unused |
| 13 |
8192 |
16383 |
Unused |
| 14 |
16384 |
32767 |
Unused |
| 15 |
32768 |
65535 |
Unused |
| Attribute |
Pixel Value |
|---|---|
| Fill |
1 |
| Clear |
66, 130 |
| Water |
68, 132 |
| Cloud Shadow |
72, 136 |
| Snow/Ice |
80, 112, 144, 176 |
| Cloud |
96, 112, 160, 176, 224 |
| Low Confidence Cloud |
66, 68, 72, 80, 96, 112 |
| Medium Confidence Cloud |
130, 132, 136, 144, 160, 176 |
| High Confidence Cloud |
224 |
Radiometric Saturation Quality Assessment Band¶
| 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 |