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modis气溶胶数据格式介绍
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更新于2023-03-16
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大气专业研究气溶胶和云领域时,需要用到HDF格式的气溶胶和云数据,本资源即对这些数据的储存格式等进行介绍
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MOD06—L2_云产品数据介绍
网址:http://modis-atmos.gsfc.nasa.gov/MOD06_L2/index.html
Collection 6
(primary SDS's only, not a complete list)
MOD06_L2 Dimension List 聽
1. Cell_Along_Swath_5km = 406
2. Cell_Across_Swath_5km = 270
3. Cell_Along_Swath_1km = 2030
4. Cell_Across_Swath_1km = 1354
5. Band_Number = 7
6. Band_Ratio = 5
7. Band_Forcing = 5
8. Band_Difference = 2
9. Radius_Difference = 2
10. QA_Parameter_5km = 10
11. QA_Parameter_1km = 5
12. Cloud_Mask_1km_Num_Bytes = 2
13. Number_of_Instrument_Scans = 203 (typical)
14. Maximum_Number_of_1km_Frames = 1354 (typical)
MOD06_L2 Scientific Data Sets (SDS's)
(Primary SDS's only, not a complete list)
MOD06_L2 product files are stored in Hierarchical Data Format (HDF). HDF is a
multi-object file format for sharing scientific data in multi-platform distributed
environments. HDF files should only be accessed through HDF library subroutine
and function calls, which can be downloaded from the HDF web site. Forty-four of
the forty-six gridded parameters listed below are stored as Scientific Data Sets
(SDS's) within the HDF file, the remaining two (Band_Number and Statistics_1km)
are stored as VData (table arrays).
Individual parameters are stored at either 1 kilometer or 5 kilometer pixel
resolution (details are given below).
Geolocation and Time Parameters
1. Longitude
Description: Geodetic Longitude
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: -180 to +180 degrees east
2. Latitude
Description: Geodetic Latitude
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: -90 to +90 degrees north
3. Scan_Start_Time
Description: International Atomic Time at Start of Scan replicated across
the Swath
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 0.0 to 3.1558E+9 seconds since 1 January 1993 00:00:00
Solar and Viewing Geometry Parameters
4. Solar_Zenith
Description: Solar Zenith Angle, Cell to Sun
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 0 to +180 degrees
5. Solar_Azimuth
Description: Solar Azimuth Angle, Cell to Sun
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: -180 to +180 degrees
6. Sensor_Zenith
Description: Sensor Zenith Angle, Cell to Sensor
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 0 to 180 degrees
7. Sensor_Azimuth
Description: Sensor Azimuth Angle, Cell to Sensor
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: -180 to 180 degrees
Science Parameters
Cloud Top Parameters (5km)
Note that seperate Near Nadir (SZA LE 32) Retrievals are stored in
(similar/parallel) SDS's with the string "Nadir" in the SDS name. These
generally are more reliable than regular retrievals, since they only contain
ONLY data that was retrieved with a less oblique instrument scanner view.
8. Brightness_Temperature
Description: Brightness Temperature for MODIS Bands 29, 31, 32, 33, 34,
35, and 36
Dimensions: (Band_Number ,Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 150 to 350 K
9. Surface_Temperature
Description: Surface Temperature
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 150 to 350 K
10. Surface_Pressure
Description: Surface Pressure
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: 800 to 1100 hPa
11. Processing_Flag
Description: Cloud Retrieval Method Flag
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: (byte array)
12. Cloud_Height_Method
Description: Cloud Height Method
Dimensions: (Cell_Along_Swath_5km, Cell_Across_Swath_5km)
Valid Range: (byte array, with values from 1 to 6)
Detail: The cloud height method index indicates if a CO2-slicing
retrieval or window channel retrieval was output.
Further, if a CO2-slicing retrieval was output, it specifies the MODIS
band pair used to generate the result.
The index ranges from 1 to 6, defined as follows: 1 = Bands 36/35, 2 =
Bands 35/34, 3 = Bands 35/33,
4 = Bands 34/33, 5 = Bands 33/31 (not used), 6 = Window channel method.
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