Google Earth Engine ——MOD09A1 V6产品提供了Terra MODIS 1-7带500米分辨率的表面光谱反射率的估计，并对大气条件如气体、气溶胶和瑞利散射进行了校正！-阿里云开发者社区

Google Earth Engine ——MOD09A1 V6产品提供了Terra MODIS 1-7带500米分辨率的表面光谱反射率的估计，并对大气条件如气体、气溶胶和瑞利散射进行了校正！

2022-04-27 343

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简介： Google Earth Engine ——MOD09A1 V6产品提供了Terra MODIS 1-7带500米分辨率的表面光谱反射率的估计，并对大气条件如气体、气溶胶和瑞利散射进行了校正！

The MOD09A1 V6 product provides an estimate of the surface spectral reflectance of Terra MODIS bands 1-7 at 500m resolution and corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the seven reflectance bands is a quality layer and four observation bands. For each pixel, a value is selected from all the acquisitions within the 8-day composite on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading.

Documentation:

MOD09A1 V6产品提供了Terra MODIS 1-7带500米分辨率的表面光谱反射率的估计，并对大气条件如气体、气溶胶和瑞利散射进行了校正。与七个反射带一起的是一个质量层和四个观测带。对于每个像素，根据高观测覆盖率、低视角、无云或云影以及气溶胶负荷，从8天合成的所有采集中选择一个值。

文件。

用户指南

算法理论基础文件(ATBD)

一般文件

Dataset Availability

2000-03-05T00:00:00 - 2021-09-14T00:00:00

Dataset Provider

NASA LP DAAC at the USGS EROS Center

Collection Snippet

ee.ImageCollection("MODIS/006/MOD09A1")

Resolution

500 meters

Bands Table

Name	Description	Min	Max	Units	Wavelength	Scale
sur_refl_b01	Surface reflectance for band 1	-100	16000		620-670nm	0.0001
sur_refl_b02	Surface reflectance for band 2	-100	16000		841-876nm	0.0001
sur_refl_b03	Surface reflectance for band 3	-100	16000		459-479nm	0.0001
sur_refl_b04	Surface reflectance for band 4	-100	16000		545-565nm	0.0001
sur_refl_b05	Surface reflectance for band 5	-100	16000		1230-1250nm	0.0001
sur_refl_b06	Surface reflectance for band 6	-100	16000		1628-1652nm	0.0001
sur_refl_b07	Surface reflectance for band 7	-100	16000		2105-2155nm	0.0001
QA	Surface reflectance 500m band quality control flags					0
QA Bitmask	Bits 0-1: MODLAND QA bits 0: Corrected product produced at ideal quality - all bands 1: Corrected product produced at less than ideal quality - some or all bands 2: Corrected product not produced due to cloud effects - all bands 3: Corrected product not produced for other reasons - some or all bands, may be fill value (11) [Note that a value of (11) overrides a value of (01)] Bits 2-5: Band 1 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 6-9: Band 2 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 10-13: Band 3 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 14-17: Band 4 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 18-21: Band 5 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 22-25: Band 6 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bits 26-29: Band 7 data quality, four bit range 0: Highest quality 7: Noisy detector 8: Dead detector, data interpolated in L1B 9: Solar zenith ≥ 86 degrees 10: Solar zenith ≥ 85 and < 86 degrees 11: Missing input 12: Internal constant used in place of climatological data for at least one atmospheric constant 13: Correction out of bounds, pixel constrained to extreme allowable value 14: L1B data faulty 15: Not processed due to deep ocean or clouds Bit 30: Atmospheric correction performed 0: No 1: Yes Bit 31: Adjacency correction performed 0: No 1: Yes
SolarZenith	MODIS Solar zenith angle	0	18000	Degrees		0.01
ViewZenith	MODIS view zenith angle	0	18000	Degrees		0.01
RelativeAzimuth	MODIS relative azimuth angle	-18000	18000	Degrees		0.01
StateQA	Surface reflectance 500m state flags					0
StateQA Bitmask	Bits 0-1: Cloud state 0: Clear 1: Cloudy 2: Mixed 3: Not set, assumed clear Bit 2: Cloud shadow 0: No 1: Yes Bits 3-5: Land/water flag 0: Shallow ocean 1: Land 2: Ocean coastlines and lake shorelines 3: Shallow inland water 4: Ephemeral water 5: Deep inland water 6: Continental/moderate ocean 7: Deep ocean Bits 6-7: Aerosol quantity 0: Climatology 1: Low 2: Average 3: High Bits 8-9: Cirrus detected 0: None 1: Small 2: Average 3: High Bit 10: Internal cloud algorithm flag 0: No cloud 1: Cloud Bit 11: Internal fire algorithm flag 0: No fire 1: Fire Bit 12: MOD35 snow/ice flag 0: No 1: Yes Bit 13: Pixel is adjacent to cloud 0: No 1: Yes Bit 14: BRDF correction performed data 0: No 1: Yes Bit 15: Internal snow mask 0: No snow 1: Snow
DayOfYear	Julian day of the year for the pixel	1	366			0

使用说明：MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.

数据引用：

LP DAAC - MOD09A1

Google Earth Engine ——MOD09A1 V6产品提供了Terra MODIS 1-7带500米分辨率的表面光谱反射率的估计，并对大气条件如气体、气溶胶和瑞利散射进行了校正！

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