| HDFEOSVersion: | HDFEOS_V2.9 |
| Number_of_Instrument_Scans: | 2030 |
| Maximum_Number_of_1km_Frames: | 1354 |
| history: | $Id: MOD35.V2.CDL,v 1.1.2.5 2002/09/16 18:24:50 raf Exp $
|
| title: | MODIS Level 2 Cloud Mask
|
| RCS_Id: | $Id: thresholds.dat.Terra,v 1.1.2.5 2004/10/25 18:09:00 raf Exp $ |
| UW_DESTRIPE_LWIR: | $Id: hdf_destripe_new.f90,v 1.8 2004/06/24 14:25:27 gumley Exp $ |
| UW_DESTRIPE_CONFIG: | MODIS destriping configuration $Id: destripe_config_terra.dat.v5nrt,v 1.1 2016/03/16 kathys Exp $ |
| Byte_Segment: | Array of 32 bit Integers [Byte_Segment = 0..5] long_name: Byte_Segment |
| Scan_Start_Time: | Array of 64 bit Reals [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] coordinates: Latitude Longitude valid_range: 0.0000000000000000, 3155800064.0000000 _FillValue: -999.90002441406250 long_name: TAI time at start of scan replicated across the swath units: seconds since 1993-1-1 00:00:00.0 0 scale_factor: 1.0000000000000000 add_offset: 0.0000000000000000 Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Solar_Zenith: | Array of 16 bit Integers [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] coordinates: Latitude Longitude valid_range: 0, 18000 _FillValue: -9999 long_name: Solar Zenith Angle, Cell to Sun units: degrees scale_factor: 0.0099999997764825821 add_offset: 0.0000000000000000 Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Solar_Azimuth: | Array of 16 bit Integers [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] coordinates: Latitude Longitude valid_range: -18000, 18000 _FillValue: -9999 long_name: Solar Azimuth Angle, Cell to Sun units: degrees scale_factor: 0.0099999997764825821 add_offset: 0.0000000000000000 Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Sensor_Zenith: | Array of 16 bit Integers [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] coordinates: Latitude Longitude valid_range: 0, 18000 _FillValue: -9999 long_name: Sensor Zenith Angle, Cell to Sensor units: degrees scale_factor: 0.0099999997764825821 add_offset: 0.0000000000000000 Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Sensor_Azimuth: | Array of 16 bit Integers [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] coordinates: Latitude Longitude valid_range: -18000, 18000 _FillValue: -9999 long_name: Sensor Azimuth Angle, Cell to Sensor units: degrees scale_factor: 0.0099999997764825821 add_offset: 0.0000000000000000 Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Cloud_Mask: | Array of 32 bit Integers [Byte_Segment = 0..5][Cell_Along_Swath_1km = 0..2029][Cell_Across_Swath_1km = 0..1353] coordinates: Byte_Segment Latitude_1 Longitude_1 valid_range: 0, -1 _FillValue: 0 long_name: MODIS Cloud Mask and Spectral Test Results units: none scale_factor: 1.0000000000000000 add_offset: 0.0000000000000000 Parameter_Type: Output Cell_Along_Swath_Sampling: 1, 2030, 1 Cell_Across_Swath_Sampling: 1, 1354, 1 Geolocation_Pointer: External MODIS geolocation product description: Bit fields within each byte are numbered from the left: 7, 6, 5, 4, 3, 2, 1, 0. The left-most bit (bit 7) is the most significant bit. The right-most bit (bit 0) is the least significant bit. bit field Description Key --------- ----------- --- 0 Cloud Mask Flag 0 = Not determined 1 = Determined 2, 1 Unobstructed FOV Quality Flag 00 = Cloudy 01 = Uncertain 10 = Probably Clear 11 = Confident Clear PROCESSING PATH --------------- 3 Day or Night Path 0 = Night / 1 = Day 4 Sunglint Path 0 = Yes / 1 = No 5 Snow/Ice Background Path 0 = Yes / 1 = No 7, 6 Land or Water Path 00 = Water 01 = Coastal 10 = Desert 11 = Land ____ END BYTE 1 ______________ ___________________________________________ bit field Description Key --------- ----------- --- ADDITIONAL INFORMATION ---------------------- 0 Non- cloud obstruction Flag 0 = Yes / 1 = No 1 Thin Cirrus Detected (Solar) 0 = Yes / 1 = No 2 Shadow Found 0 = Yes / 1 = No 3 Thin Cirrus Detected (Infrared) 0 = Yes / 1 = No 4 Adjacent Cloud Detected ** 0 = Yes / 1 = No ** Implemented Post Launch to Indicate cloud found within surrounding 1 km pixels * 1-km CLOUD FLAGS ---------------- 5 Cloud Flag - IR Threshold 0 = Yes / 1 = No 6 High Cloud Flag - CO2 Test 0 = Yes / 1 = No 7 High Cloud Flag - 6.7 micron Test 0 = Yes / 1 = No ____ END BYTE 2 ______________ ___________________________________________ bit field Description Key --------- ----------- --- 0 High Cloud Flag - 1.38 micron Test 0 = Yes / 1 = No 1 High Cloud Flag - 3.7- 12 micron Test 0 = Yes / 1 = No 2 Cloud Flag - IR Temperature 0 = Yes / 1 = No Difference 3 Cloud Flag - 3.7- 11 micron Test 0 = Yes / 1 = No 4 Cloud Flag - Visible Reflectance Test 0 = Yes / 1 = No 5 Cloud Flag - Visible Reflectance 0 = Yes / 1 = No Ratio Test 6 Cloud Flag - NDVI Final Confidence 0 = Yes / 1 = No Confirmation Test 7 Cloud Flag - Night 7.3- 11 micron Test 0 = Yes / 1 = No ____ END BYTE 3 ______________ ___________________________________________ bit field Description Key --------- ----------- --- ADDITIONAL TESTS ---------------- 0 Cloud Flag - Spare 0 = Yes / 1 = No 1 Cloud Flag - Spatial Variability 0 = Yes / 1 = No 2 Final Confidence Confirmation Test 0 = Yes / 1 = No 3 Cloud Flag - Night Water 0 = Yes / 1 = No Spatial Variability 4 Suspended Dust Flag 0 = Yes / 1 = No 5-7 Spares ____ END BYTE 4 ______________ ___________________________________________ bit field Description Key --------- ----------- --- 250-m Cloud Flag - Visible Tests -------------------------------- 0 Element(1,1) 0 = Yes / 1 = No 1 Element(1,2) 0 = Yes / 1 = No 2 Element(1,3) 0 = Yes / 1 = No 3 Element(1,4) 0 = Yes / 1 = No 4 Element(2,1) 0 = Yes / 1 = No 5 Element(2,2) 0 = Yes / 1 = No 6 Element(2,3) 0 = Yes / 1 = No 7 Element(2,4) 0 = Yes / 1 = No ____ END BYTE 5 ______________ ___________________________________________ bit field Description Key ---------- ----------- --- 0 Element(3,1) 0 = Yes / 1 = No 1 Element(3,2) 0 = Yes / 1 = No 2 Element(3,3) 0 = Yes / 1 = No 3 Element(3,4) 0 = Yes / 1 = No 4 Element(4,1) 0 = Yes / 1 = No 5 Element(4,2) 0 = Yes / 1 = No 6 Element(4,3) 0 = Yes / 1 = No 7 Element(4,4) 0 = Yes / 1 = No ____ END BYTE 6 ______________ ___________________________________________ |
| Quality_Assurance: | Array of 32 bit Integers [Cell_Along_Swath_1km = 0..2029][Cell_Across_Swath_1km = 0..1353][QA_Dimension = 0..9] coordinates: Latitude_1 Longitude_1 QA_Dimension valid_range: 0, -1 _FillValue: 0 long_name: Quality Assurance for Cloud Mask units: none scale_factor: 1.0000000000000000 add_offset: 0.0000000000000000 Parameter_Type: Output Cell_Along_Swath_Sampling: 1, 2030, 1 Cell_Across_Swath_Sampling: 1, 1354, 1 Geolocation_Pointer: External MODIS geolocation product description: Product Run Time QA Flags QA Flag Name Number of Bits Bit Value Description ------------------------------------------------------------- Cloud Mask QA 1 0 not useful (1km) 1 useful Cloud Mask 3 0-7 8 confidence levels Confidence QA (1km) Spares 4 -------- ( 1 byte total ) -------------------------------- Optional run time QA flags - Individual test application QA Flag Name Number of Bits Bit Value Description ------------------------------------------------------------- NCO test 1 0 Not Applied 1 Applied Thin Cirrus 1 0 Not Applied test (Solar) 1 Applied Shadow Tests 1 0 Not Applied 1 Applied Thin Cirrus 1 0 Not Applied test(IR) 1 Applied Cloud Adjancency 1 0 Not Applied test(IR) 1 Applied IR Threshold 1 0 Not Applied test 1 Applied High Cloud 1 0 Not Applied Test (CO2) 1 Applied High Cloud 1 0 Not Applied Test (6.7) 1 Applied High Cloud 1 0 Not Applied Test (1.38) 1 Applied High Cloud 1 0 Not Applied Test (3.7-12um) 1 Applied IR Temperature 1 0 Not Applied Difference Tests 1 Applied 3.7-11um Test 1 0 Not Applied 1 Applied .68 Reflectance 1 0 Not Applied Test 1 Applied Visible Ratio 1 0 Not Applied Test 1 Applied NDVI Final 1 0 Not Applied Confidence 1 Applied Confirmation Spare 1 0 Not Applied 1 Applied Spare 1 0 Not Applied 1 Applied Spatial 1 0 Not Applied Variability Test 1 Applied Final Confidence 1 0 Not Applied Confirmation Test 1 Applied Night Water 1 0 Not Applied Spatial Variability 1 Applied Suspended Dust Test 1 0 Not Applied 1 Applied Spares 3 250 m Visible 1(16) 0 Not Applied Tests 1 Applied (16 times as (line1,element1),(line1, element2),... (line4,element4)) -------- ( 5 bytes total ) -------------------------------- Optional run time QA flags - data information flags QA Flag Name Number of Bits Bit Value Description ------------------------------------------------------------- Number of 2 0 None bands used to 1 1-7 generate 2 8-14 cloud mask 3 15-21 Number of 2 0 None spectral 1 1-3 tests used to 2 4-6 generate 3 7-9 cloud mask Spares 4 -------- ( 1 byte total ) -------------------------------- Optional run time QA flags - data resource flags QA Flag Name Number of Bits Bit Value Description ------------------------------------------------------------- Clear 2 0 MOD35 Radiance 1 Model forward calculation Origin 2 Other 3 Not used Surface 2 0 NCEP GDAS Temperature 1 DAO Over Land 2 MOD11 3 Other Surface 2 0 Reynolds blended Temperature 1 DAO Over Ocean 2 MOD28 3 Other Surface Winds 2 0 NCEP GDAS 1 DAO 2 Other 3 Not used Ecosystem Map 2 0 Loveland NA 1km 1 Olson Ecosystem 2 MOD12 3 Other Snow mask 2 0 MOD33 1 SSMI Product 2 Other 3 Not used Ice cover 2 0 MOD42 1 SSMI product 2 Other 3 Not used Land/Sea Mask 2 0 USGS 1 km 6 level 1 USGS 1 km binary 2 Other 3 Not used Digital 1 0 EOS DEM Elevation 1 Not used Model Precipitable 2 0 NCEP GDAS Water 1 DAO 2 MOD07 3 Other Spare 5 -------- ( 3 bytes total ) -------------------------------- |
| Latitude: | Array of 32 bit Reals [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] units: degrees_north valid_range: -90.00000000, 90.00000000 _FillValue: -999.9899902 long_name: Geodetic Latitude Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Longitude: | Array of 32 bit Reals [Cell_Along_Swath_5km = 0..405][Cell_Across_Swath_5km = 0..269] units: degrees_east valid_range: -180.0000000, 180.0000000 _FillValue: -999.9899902 long_name: Geodetic Longitude Parameter_Type: MODIS Input Cell_Along_Swath_Sampling: 3, 2028, 5 Cell_Across_Swath_Sampling: 3, 1348, 5 Geolocation_Pointer: Internal geolocation arrays |
| Latitude_1: | Array of 32 bit Reals [Cell_Along_Swath_1km = 0..2029][Cell_Across_Swath_1km = 0..1353] units: degrees_north long_name: Latitude_1 |
| Longitude_1: | Array of 32 bit Reals [Cell_Along_Swath_1km = 0..2029][Cell_Across_Swath_1km = 0..1353] units: degrees_east long_name: Longitude_1 |
| QA_Dimension: | Array of 32 bit Integers [QA_Dimension = 0..9] units: level long_name: QA_Dimension(fake) |