This diurnal (hourly) land surface albedo product is with a spatial resolution of 0.02 ° x 0.02 ° over the Tibet Plateau from 2016-2019. Multi-sensory data is used to retrieve the Extended Multi-Sensor Combined BRDF Inversion model (EMCBI) developed from a kernel-driven BRDF model and coupled with topographic effects, and prior knowledge is introduced for quality control inversion. The high-precision BRDF / albedo of good spatial-temporal continuity is retrieved by combining MODIS reflectance data (a polar orbiting satellite) and himiwarri-8 AHI land surface reflectance (a geostationary satellite ). MODIS land surface reflectance data and AHI TOA reflectance data are downloaded from the official websites. After registration, atmospheric correction and other processing, the daily resolution BRDF is synthesized with a period of 5 days, and then the albedo is estimated. The black sky albedo is calculated hourly from 9:00 to 18:00 at Beijing Time (UTM zone 8). The validation results show that it meets the accuracy requirements of albedo application, and agreed well with the in situ albedo inner-daily variation.Tt has more advantages in capturing rapidly changing surface features, especially the inner-daily variations, and has better temporal and spatial continuity. It can effectively support the study of radiation energy balance and environmental change in the Tibet Plateau.

File naming and required software

File naming convention: diurnalAlbedoYYYYDDD005.dat (yyyy: year, DDD: Day (Julian day)), such as diurnalAlbedo2016003005.dat indicates the albedo of the Tibetan Plateau on the first day of 2016
Data reading mode: stored in bare data format, which can be opened by envi, ArcGIS and other software
Data version number: v1
Projection + proj = longlat + datum = WGS84
Data format: raw, 1600 rows × 750 columns
Fill value: 32767
Scale: / 10000 (divided by 10000, is the albedo)
Band Description: There are 36 bands in total including three broadband (VIS, NIR and SW) Black Sky Albedo (BSA) at each hour from 8:00 to 18:00 in Beijing Time (i.e. UTM Zone 8) numbered as 1-33 bands, and Band 34-36 are VIS, NIR and SW white-sky albedo. Every three band for BSA at a specific hour arranged in the order of VIS, NIR and SW, like Band 1-3 is the BSA of visible (VIS), near-infrared (NIR) and shortwave(SW) BSA at 8:00 Beijing Time respectively, Detailed band description please see the band Instruction document.

Data Citations Data citation guideline What's data citation?

Cite as:

You, D., Tang, Y., Han, Y. (2022). The diurnal（hourly）albedo product coupling topographic effects and combining multi-sensory data over the Tibet Plateau (2016-2019). A Big Earth Data Platform for Three Poles, DOI: 10.11888/Terre.tpdc.272050. CSTR: 18406.11.Terre.tpdc.272050. (Download the reference： RIS | Bibtex )

Related Literatures:

1. Wen, J., You, D., Han, Y., Lin, X., Wu, S., Tang, Y., Xiao, Q., & Liu, Q. (2022). Estimating Surface BRDF/Albedo Over Rugged Terrain Using an Extended Multisensor Combined BRDF Inversion (EMCBI) Mode. IEEE Geosci. Remote Sens. Lett., 19, 1-5.( View Details | Bibtex)

Using this data, the data citation is required to be referenced and the related literatures are suggested to be cited.

Support Program

2nd survey of Tibet plateau (No:2019QZKK0206)

Algorithm development of Tibetan BRDF/Albedo from multi-sensory data coupling topographic effects in cases of snow or snow-free repectitively (No:41971316)

Copyright & License

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License： This work is licensed under an Attribution 4.0 International (CC BY 4.0)