MOD09 (Surface Reflectance) User s Guide
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1 MOD09 (Surface ) User s Guide MODIS Land Surface Science Computing Facility Principal Investigator: Dr. Eric F. Vermote Web site: Correspondence address: Prepared by E. F. Vermote and S. Y. Kotchenova Version 1.1 March, 2008
2 Table of Contents 1. Product description List of products Differences between Collection 4 and Collection Data ordering (& browsing) Data viewing tools Data product granule ID Data product grids MODIS sinusoidal grid Climate Modeling Grid (CMG) Data product structure Description and Science Data Sets (Collection 5) MOD09GQ / MYD09GQ MOD09GA / MYD09GA MOD09Q1 / MYD09Q MOD09A1 / MYD09A MOD09CMG / MYD09CMG Description and Science Data Sets (Collection 4) MOD09GQK / MYD09GQK MOD09GHK / MYD09GHK MOD09Q1 / MYD09Q MOD09A1 / MYD09A MOD09GST / MYD09GST Data product quality m resolution QA m and coarse resolution QA Data product state flags m and 1-km resolution data state QA (Collection 5) km resolution data state QA (Collection 4) Geolocation flags (Collection 5) Scan value information (Collection 5) Internal climatology (Collection 5) Orbit and coverage (Collection 4) Useful links
3 If there is something else you would like to see in the MOD09 User's Guide, please write to us at We will be happy to consider your suggestions! Notes: a) A number of significant improvements have also been introduced into the AC algorithm, including the LUT-format modification for a more accurate interpolation of atmospheric parameters and the use of dynamic aerosol models and ocean bands for improved aerosol retrieval over land surface. A detailed description of these changes can be found at the MODIS Land Quality Assessment Web site ( b) Please check the product availability on our Web site at 3
4 1. Product description MOD09 (MODIS Surface ) is a seven-band product computed from the MODIS Level 1B land bands 1 ( nm), 2 ( nm), 3 ( ), 4 ( nm), 5 ( nm), 6 ( nm), and 7 ( nm). The product is an estimate of the surface spectral reflectance for each band as it would have been measured at ground level as if there were no atmospheric scattering or absorption. It corrects for the effects of atmospheric gases, aerosols, and thin cirrus clouds. 2. List of products Collection 4 Product Full Name Product Abbreviation Terra Aqua Surface Daily L2G Global 250 m MOD09GQK MYD09GQK Surface Daily L2G Global 500 m MOD09GHK MYD09GHK Surface 8-Day L3 Global 250 m MOD09Q1 MYD09Q1 Surface 8-Day L3 Global 500 m MOD09A1 MYD09A1 Surface Quality Daily L2G Global 1km MOD09GST MYD09GST Collection 5 Product Full Name Product Abbreviation Terra Aqua Surface Daily L2G Global 250 m MOD09GQ MYD09GQ Surface Daily L2G Global 500 m and 1 km MOD09GA MYD09GA Surface 8-Day L3 Global 250 m MOD09Q1 MYD09Q1 Surface 8-Day L3 Global 500 m MOD09A1 MYD09A1 Surface Daily L3 Global 0.05Deg CMG* MOD09CMG MYD09CMG *CMG Climate Modeling Grid 4
5 3. Differences between Collection 4 and Collection 5 The contents of MOD09 have been changed to meet the user's demand. a) The Daily Surface Quality product at 1-km resolution was incorporated into the Daily Surface product at 500-m resolution. b) The Daily Surface products at 500-m and 1-km resolution have new abbreviated names. c) A new product called Global Daily Surface at 0.05 resolution was created. This product is applied on a Climate Modeling Grid (CMG) for the purpose of being used in climate simulation models. 4. Data ordering (& browsing) a) EOS (Earth Observing System) Data Gateway The main source of data, a place an order database, a quick-start tutorial. Link: b) LP DAAC (Land Processes Distributed Active Archive Center) Useful information and links, ftp-access to a subset of MODIS land products. Link: c) US Geological Survey (USGS) Global Visualization (GloVIS) Access to selected MODIS land products with browse capability. Link: d) MODIS Land Global Browse Images 5-km versions of selected product to enable synoptic quality assessment. Link: e) Earth Science Data Interface (ESDI) at the Global Land Cover Facility 32-day composites, images in GeoTiff format, limited products. Link: 5
6 5. Data viewing tools a) Imager (platform: Linux) A software tool specifically designed by the MODIS LSR SCF for viewing surface reflectance suites. Link: b) HDFLook (platforms: SUN, AIX, SGI, Linux, MacOSX, Cygwin) A multifunctional data processing and visualization tool for land, ocean and atmosphere MODIS data. Link: c) ENVI (platforms: Windows & Linux) A software for the visualization, analysis, and presentation of all types of digital imagery. Link: d) HDF Explorer (platform: Windows) A software environment where data are first viewed in a tree-like interface, and then optionally loaded and visualized in a variety of ways. Link: 6. Data product granule ID Example 1: MOD09GHK.A h18v hdf MOD09GHK: product name (MODIS Terra Surface Daily L2G Global 500 m) A : Acquisition year (2006) and Julian day (351) h18v06: tile ID (see MODIS sinusoidal grid) 004: Collection : Production year (2006), Julian day (353), and time (16:39:45) Example 2: MOD09CMG.A hdf MOD09CMG: product name (MODIS Terra Surface Daily L3 Global 0.05Deg. CMG) A : Acquisition year (2000) and Julian day (338) 005: Collection : Production year (2006), Julian day (332), and time (09:11:04) 6
7 7. Data product grids 7.1. MODIS sinusoidal grid The Earth's surface is divided into tiles (10 x 10 ). Figure 1. The MODIS sinusoidal grid with an example tile shown as a RGB-image produced from the MODIS data acquired on December 3, 2006 over the US East cost. This product Granule ID is MOD09A1.A h11v hdf. 7
8 7.2. Climate Modeling Grid (CMG) The resolution of CMG is This grid is primarily used in climate studies. Figure 2. An example of MODIS product based on the Climate Modeling Grid. The shown RGB-color image was produced from the MODIS data acquired on December 4, The product granule ID is MOD09CMG.A hdf. 8
9 8. Data product structure 8.1. Description and Science Data Sets (Collection 5) MOD09GQ / MYD09GQ MODIS Terra/Aqua Surface Daily L2G Global 250 m Product description: MOD09GQ (MYD09GQ) provides MODIS band 1-2 daily surface reflectance at 250-m resolution. This product is meant to be used in conjunction with the MOD09GA where important quality and viewing geometry information is stored. Figure 3. An example of MOD09GQ surface reflectance product. The corresponding MODIS data were collected on December 3, 2000 over the US territory (in particular, over Alabama, Mississippi and Florida). Product Granule ID: MOD09GQ.A h10v hdf. Upper image: Band 2 (near-infrared ) surface reflectance shown on a gray scale. Lower image: A false-color RGB combination of bands 2, 1, and 1. Vegetation appears red, water appears blue, and clouds appears white. A land/sea mask has been used to remove deep ocean water which appears black. Table 1. Science Data Sets for MOD09GQ / MYD09GQ. Science Data Sets (HDF Layers) (5) Units Bit Type Fill Value Valid Range Scale Factor num_observations: number of observations within a pixel None 8-bit signed NA 250m Surface Band 1 ( nm) 250m Surface Band 2 ( nm) 250m Band Quality (see Table 11) Bit Field 16-bit unsigned NA obs_cov: Observation Coverage (percentage of the grid cell area covered by the observation) Percent 8-bit signed (0.001)
10 MOD09GA / MYD09GA MODIS Terra/Aqua Surface Daily L2G Global 500 m and 1 km Product description: MOD09GA (MYD09GA) provides MODIS band 1-7 daily surface reflectance at 500-m resolution and 1-km observation and geolocation statistics. Figure 4. A MOD09GA RGB-image composed of surface reflectance measured by MODIS bands 1 (red), 4 (green) and 3 (blue) on December 6, 2000 over the US East coast. Product granule ID: MOD09GA.A h11v hdf Table 2. Science Data Sets for MOD09GA / MYD09GA. Data Group 1 km Science Data Sets (HDF Layers (21)) num_observations_1km: Number of Observations State_1km: Data State (see Table 13 ) Sensor Zenith Angle Sensor Azimuth Angle Range: pixel to sensor Solar Zenith Angle Solar Azimuth Angle NA Units Bit Type Fill Value Valid Range Bit Field Degree Degree Meter Degree Degree 8-bit signed 16-bit unsigned 16-bit unsigned NA NA Scale Factor gflags: Geolocation flags (see Table 15 ) Bit Field 8-bit unsigned NA orbit_pnt: Orbit Pointer none 8-bit signed NA ***** ******************** ******** ********** ******** ********** ********* 10
11 500 m num_observations_500m none sur_refl_b01: 500m Surface Band 1 ( nm) sur_refl_b02: 500m Surface Band 2 ( nm) sur_refl_b03: 500m Surface Band 3 ( nm) sur_refl_b04: 500m Surface Band 4 ( nm) sur_refl_b05: 500m Surface Band 5 ( nm) sur_refl_b06: 500m Surface Band 6 ( nm) sur_refl_b07: 500m Surface Band 7 ( nm) QC_500m: 500m Band Quality (see Table 12) Obs_cov_500m: Observation coverage iobs_res: Observation number q_scan: 250m scan value information (see Table 16) Bit Field Percent none Bit Field 8-bit signed 32-bit unsigned 8-bit signed 8-bit unsigned 8-bit unsigned NA NA NA NA (0.01)
12 MOD09Q1 / MYD09Q1 MODIS Terra/Aqua Surface 8-Day L3 Global 250 m Product description: MOD09Q1 (MYD09Q1) provides MODIS band 1-2 surface reflectance at 250-m resolution. It is a level-3 composite of MOD09GQ (MYD09GQ). Each MOD09Q1 (MYD09Q1) pixel contains the best possible L2G observation during an 8-day period as selected on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading. Figure 5. An example of MOD09Q1 surface reflectance product. The corresponding MODIS data were collected in December, 2000 over the US territory (in particular, over Alabama, Mississippi and Florida). Product Granule ID: MOD09Q1.A h10v hdf. Upper image: Band 2 (near-infrared ) surface reflectance shown on a gray scale. Lower image: A false-color RGB combination of bands 2, 1, and 1. Vegetation appears red, water appears blue, and clouds appears white. A land/sea mask has been used to remove deep ocean water which appears black. Table 3. Science Data Sets for MOD09Q1 / MYD09Q1 Science Data Sets (HDF Layers (3)) 250m Surface Band 1 ( nm) 250m Surface Band 2 ( nm) Units Bit Type Fill Value Valid Range Scale Factor 250m Band Quality (see Table 11) Bit Field 16-bit unsigned NA 12
13 MOD09A1 / MYD09A1 MODIS Terra/Aqua Surface 8-Day L3 Global 500 m Product description: MOD09A1 (MYD09A1) provides MODIS band 1-7 surface reflectance at 500 m resolution. It is a level-3 composite of 500-m resolution MOD09GA (MYD09GA). Each product pixel contains the best possible L2G observation during an 8-day period as selected on the basis of high observation coverage, low view angle, absence of clouds or cloud shadow, and aerosol loading. Figure 6. A MOD09A1 RGB image composed of surface reflectance data measured by bands 1 (red), 4 (green) and 3(blue) in December, 2000 over the US East coast. Granule ID: MOD09A1.A h11v hdf Table 4. Science Data Sets for MOD09A1 / MYD09A1 Science Data Sets (HDF Layers (13)) 500m Surface Band 1 ( nm) 500m Surface Band 2 ( nm) 500m Surface Band 3 ( nm) 500m Surface Band 4 ( nm) 500m Surface Band 5 ( nm) 500m Surface Band 6 ( nm) 500m Surface Band 7 ( nm) 500m Band Quality (see Table 12) Units Bit Type Fill Value Valid Range Scale Factor Bit Field 32-bit unsigned NA Solar Zenith Angle Degree View Zenith Angle Degree Relative Azimuth Angle Degree m State Flags (see Table 13) Bit field 16-bit unsigned NA Day of Year Julian day 16-bit unsigned NA 13
14 MOD09CMG / MYD09CMG MODIS Terra/Aqua Surface Daily L3 Global 0.05Deg CMG Product description: MOD09CMG (MYD09CMG) provides MODIS band 1-7 surface reflectance at 0.05-degree resolution. This product is based on a Climate Modeling Grid (CMG) for the purpose of being used in climate simulation models. Figure 7. A MOD09CMG RGB-image composed of surface reflectance data measured by bands 1 (red), 4 (green) and 3 (blue) on December 7, The MODIS product granule ID is MOD09CMG.A hdf. 14
15 Table 5. Science Data Sets for MOD09CMG / MYD09CMG. Science Data Sets (HDF Layers (19)) Coarse Resolution Surface Band 1 ( nm) Coarse Resolution Surface Band 2 ( nm) Coarse Resolution Surface Band 3 ( nm) Coarse Resolution Surface Band 4 ( nm) Coarse Resolution Surface Band 5 ( nm) Coarse Resolution Surface Band 6 ( nm) Coarse Resolution Surface Band 7 ( nm) Coarse Resolution Solar Zenith Angle Coarse Resolution View Zenith Angle Coarse Resolution Relative Azimuth Angle Coarse Resolution Ozone Coarse Resolution Brightness Temperature Band 20 ( µm) Coarse Resolution Brightness Temperature Band 21 ( µm) Coarse Resolution Brightness Temperature Band 31 ( µm) Coarse Resolution Brightness Temperature Band 32 ( µm) Units Degree Degree Degree cm atm degrees K degrees K degrees K degrees K Bit Type 8-bit unsigned 16-bit unsigned 16-bit unsigned 16-bit unsigned 16-bit unsigned Fill Value Valid Range Scale Factor Coarse Resolution Granule Time HHMM 16-bit Coarse Resolution QA (see Table 12) Coarse Resolution Internal CM (see Table 17) Averaged Number of Pixels Bit Field Bit Field unitless 32-bit unsigned 16-bit unsigned 8-bit unsigned NA NA NA 15
16 8.2. Description and Science Data Sets (Collection 4) MOD09GQK / MYD09GQK MODIS Terra/Aqua Surface Daily L2G Global 250 m Product description: MOD09GQK (MYD09GQK) provides MODIS band 1-2 daily surface reflectance at 250-m resolution. The best observations during a 24-hour period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 250-m Pointer Files (MODPTQKM (see Section 9)). Quality information for this product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file. Figure 8. An example of MYD09GQK surface reflectance product. The corresponding MODIS data were collected on May 26, 2004 over Brazil, South America. Granule ID: MYD09GQK.A h12v hdf. Upper image: Band 2 (near-infrared ) Surface shown on a gray scale. Lower image: A false-color RGB combination of bands 2, 1, and 1. Vegetation appears red, water appears blue, and clouds appears white. A land/sea mask has been used to remove deep ocean water which appears black. Table 6. Science Data Sets for MOD09GQK / MYD09GQK Science Data Sets (HDF Layers) (5) 250m Surface Band 1 ( nm) 250m Surface Band 2 ( nm) 250m Band Quality (see Table 11) Units Data Type Fill Value Valid Range Scale Factor (divide by) Bit field 16-bit unsigned NA Orbit and coverage (see Table 18) Bit field 8-bit unsigned NA Number of Observations NA 8-bit signed NA 16
17 MOD09GHK / MYD09GHK MODIS Terra/Aqua Surface Daily L2G Global 500 m Product description: MOD09GHK (MYD09GHK) provides surface reflectance data at 250-m resolution for bands 1-2 and at 500-m resolution for bands 3-7. The best observations during a 24-hour period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 500-m Pointer Files (MODPTHKM (see Section 9). Quality information for this product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file. Figure 9. A MOD09GHK RGB-image composed of surface reflectance measured by bands 1 (red), 4 (green) and 3 (blue) on December 17, 2000 Sahara, Africa. Granule ID: MOD09GHK.A h18v hdf Table 7. Science Data Sets for MOD09GHK / MYD09GHK Science Data Sets (HDF Layers (10)) 250m Surface Band 1 ( nm) 250m Surface Band 2 ( nm) 500m Surface Band 3 ( nm) 500m Surface Band 4 ( nm) 500m Surface Band 5 ( nm) 500m Surface Band 6 ( nm) 500m Surface Band 7 ( nm) 500m Band Quality (see Table 12) Units Data Type Fill Value Valid Range Bit field 32-bit unsigned NA Orbit and coverage Bit field 8-bit unsigned NA Number of Observations NA 8-bit signed NA Scale Factor (divide by) 17
18 MOD09Q1 / MYD09Q1 MODIS Terra/Aqua Surface 8-Day L3 Global 250 m Product description: MOD09Q1 (MYD09Q1) provides band 1-2 surface reflectance at 250 m resolution. It is a level-3 composite of MOD09GQK (MYD09GQK). The best observations during an 8-day period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 250-m Pointer Files (MODPTQKM (see Section 9)). Quality information for the MOD09Q1 product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file. Figure 10. An example of MYD09GQK surface reflectance product. The corresponding MODIS data were collected in May 2004 mostly over Brazil, South America. Granule ID: MYD09Q1.A h12v hdf. Upper image: Band 2 (near-infrared ) surface reflectance shown on a gray scale. Lower image: A false-color RGB combination of bands 2, 1, and 1. Vegetation appears red, water appears blue, and clouds appears white. A land/sea mask has been used to remove deep ocean water which appears black. Table 8. Science Data Sets for MOD09Q1 / MYD09Q1 Science Data Sets (HDF Layers (3)) Surface for band 1 ( nm) Surface for band 2 ( nm) Surface reflectance 250m quality control flags (see Table 11) Units Data Type Fill Value Valid Range Scale Factor Bit field 16-bit unsigned NA 18
19 MOD09A1 / MYD09A1 MODIS Terra/Aqua Surface 8-Day L3 Global 500 m Product description: MOD09A1 (MYD09A1) is a composite of MOD09GHK (MYD09GHK). The best observations during an 8-day period, as determined by the overall pixel quality and observational coverage, are matched geographically according to corresponding 500-m Pointer Files (MODPTHKM (see Section 9)). Quality information for the MOD09A1 product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file. Figure 11. A MOD09A1 RGB-image composed of surface reflectance measured by bands 1 (red), 4 (green) and 3(blue) in May 2004 mostly over Brazil, South America. Granule ID: MYD09A1.A h12v hdf. Table 9. Science Data Sets for MOD09A1 / MYD09A1 Science Data Sets (HDF Layers (13)) Surface for band 1 ( nm) Surface for band 2 ( nm) Surface for band 3 ( nm) Surface for band 4 ( nm) Surface for band 5 ( nm) Surface for band 6 ( nm) Surface for band 7 ( nm) Surface reflectance 500m quality control flags (see Table 12) Units Data Type-bit Fill Value Valid Range Scale Factor reflectance reflectance reflectance reflectance reflectance reflectance reflectance Bit field 32-bit unsigned NA Solar zenith Degree View zenith Degree Relative azimuth Degree Surface reflectance 500m state flags (see Table 13) Bit field 16-bit unsigned NA Surface reflectance day of year Julian Day 16-bit unsigned NA 19
20 8.2.5 MOD09GST / MYD09GST MODIS Terra/Aqua Surface Quality Daily L2G Global 1 km Product description: MOD09GST is a restructured version of the quality data in level-2 surface reflectance. It summarizes the quality of the MOD09 products, including atmospheric and other correction states. The product specifically contains information pertaining to cloud and cloud shadow, land and water designations, aerosols, and the data source of corrections performed on the file. color cloud value land/sea value magenta [undefined] [undefined] violet clear shallow ocean yellow cloudy shallow ocean green clear land red cloudy land white clear coastlines/shorelines coral cloudy coastlines/shorelines plum cloudy shallow inland water cyan cloudy ephemeral water blue clear continental/moderate ocean sienna cloudy continental/moderate ocean MOD09GHK RGB-image Figure 12. The table above interprets the colors used to display the MOD09GST surface reflectance data state product over MODIS tile h08v06 covering northern Mexico on April 4, Corresponding information from MOD09GST Table 10. Science Data Sets for MOD09GST / MYD09GST Science Data Sets (HDF Layers (3)) 1km Data State QA (see Table 14 ) Units Data Type-bit Fill Value Valid Range Bit field 16-bit unsigned Orbit and coverage Bit field 8-bit unsigned Number of Observations NA 8-bit signed
21 8.3. Data product quality m resolution QA Table m surface reflectance data QA description (16-bit). Bit No. Parameter Name 0-1 MODLAND QA bits Bit Comb. Sur_refl_qc_250m 00 corrected product produced at ideal quality all bands 01 corrected product produced at less than ideal quality some or all bands 10 corrected product not produced due to cloud effects all bands cloud state 00 clear band 1 data quality four bit range band 2 data quality four bit range atmospheric correction performed adjacency correction performed 01 cloudy 10 mixed corrected product not produced due to other reasons some or all bands may be fill value [Note that a value of (11) overrides a value of (01)]. 11 not set; assumed clear 0000 highest quality 1000 dead detector; data interpolated in L1B 1001 solar zenith >= 86 degrees 1010 solar zenith >= 85 and < 86 degrees 1011 missing input 1100 internal constant used in place of climatological data for at least one atmospheric constant 1101 correction out of bounds, pixel constrained to extreme allowable value 1110 L1B data faulty 1111 not processed due to deep ocean or clouds spare (unused) SAME AS BAND ABOVE 21
22 m and coarse resolution QA Table m and coarse resolution surface reflectance data QA description (32-bit). Bit No. Parameter Name 0-1 MODLAND QA bits 2-5 band 1 data quality, four bit range Bit Comb. QC_500m / Coarse Resolution QA 00 corrected product produced at ideal quality -- all bands corrected product produced at less than ideal quality -- some or all bands corrected product not produced due to cloud effects -- all bands 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)] highest quality 1000 dead detector; data interpolated in L1B 1001 solar zenith >= 86 degrees 1010 solar zenith >= 85 and < 86 degrees 1011 missing input internal constant used in place of climatological data for at least one atmospheric constant correction out of bounds, pixel constrained to extreme allowable value 1110 L1B data faulty 1111 not processed due to deep ocean or clouds 6-9 band 2 data quality four bit range same as band above band 3 data quality four bit range same as band above band 4 data quality four bit range same as band above band 5 data quality four bit range same as band above band 6 data quality four bit range same as band above band 7 data quality four bit range same as band above 30 atmospheric correction performed 31 adjacency correction performed 22
23 8.4. Data product state flags m and 1-km resolution data state QA (Collection 5) Table m and 1-km resolution data state QA description (16-bit) Bit No. Parameter Name Bit Comb. state_1km 00 clear 0-1 cloud state 01 cloudy 10 mixed 11 not set, assumed clear 2 cloud shadow 000 shallow ocean 001 land 010 ocean coastlines and lake shorelines 3-5 land/water flag 011 shallow inland water 100 ephemeral water 101 deep inland water 110 continental/moderate ocean 111 deep ocean 00 climatology 6-7 aerosol quantity 01 low 10 average 11 high 0ne 8-9 cirrus detected 01 small 10 average 11 high 10 1 internal cloud algorithm flag cloud cloud 11 internal fire algorithm flag 1 fire fire 12 MOD35 snow/ice flag 13 Pixel is adjacent to cloud 1 0 yes no 23
24 14 BRDF correction performed 15 internal snow mask 1 snow snow km resolution data state QA (Collection 4) Table km Surface data state QA Description (16-bit) for Collection 4. Bits contain different information in Collection 4 product compared to Collection 5 product. 10 PGE11 cloud algorithm flag 11 PGE11 fire algorithm flag 12 MOD35 snow/ice flag BRDF correction performed 15 PGE11 snow algorithm flag 1 clear 0 cloudy 1 fire fire 0 01 Montana methodology 10 Boston methodology 1 snow snow 24
25 8.5. Geolocation flags (Collection 5) Table kilometer geolocation flags (16-bit). Bit No. Description Bit Comb. state_1km 0-2 fill 00 Fill 3 Sensor range validity flag 0 Valid 1 Invalid 4 Digital elevation model quality flag 0 Valid 1 Missing/inferior 5 Terrain data validity 0 Valid 1 Invalid 6 Ellipsoid intersection flag 0 Valid intersection 1 No intersection 7 Input data flag 0 1 Valid Invalid 25
26 8.6. Scan value information (Collection 5) Table m scan value information description (8-bit). Bit No. Parameter Name Bit Comb. q_scan 0 missing observation in quadrant 4 [+0.5 row, +0.5 column] 1 missing observation in quadrant 3 [+0.5 row, -0.5 column]; 2 missing observation in quadrant 2 [-0.5 row, +0.5 column] 3 missing observation in quadrant 1 [-0.5 row, -0.5 column] 4 scan of observation in quadrant 4 [+0.5 row, +0.5 column] 5 scan of observation in quadrant 3 [+0.5 row, +0.5 column] 6 scan of observation in quadrant 2 [+0.5 row, +0.5 column] 7 scan of observation in quadrant 1 [+0.5 row, +0.5 column] 1 same 0 different 1 same 0 different 1 same 0 different 1 same 0 different Note: The 250-m samples are for each of four quadrants within a 500-m cell. The first line/sample is in the upper left (north-west) corner of the image first 250m line (row), first 250m sample (column) 1 -- first 250m line, second 250m sample 2 -- second 250m line, first 250m sample 3 -- second 250m line, second 250m sample 26
27 8.7. Internal climatology (Collection 5) Table 17. Coarse resolution internal CM (15-bit). Bit No. Description Bit Comb. state 0 cloudy 1 clear 2 high clouds 3 low clouds 4 snow 5 fire 6 sun glint 7 dust 8 cloud shadow 9 pixel is adjacent to cloud 0ne cirrus 01 small 10 average 11 high 12 pan flag 1 salt pan salt pan 13 criteria used for aerosol retrieval 1 criterion 2 0 criterion 1 14 AOT (aerosol optical thinkness) has climatological values 15 Unused
28 8.8. Orbit and coverage (Collection 4) Table 18. Orbit and coverage data set (8-bit) for Collection 4 (the orbit the observation came from and the observation coverage). Bit No. Parameter Name Bit Comb. orb_cov_1 0-3 orbit number range: from 0 to 13 key: from 0000 (0) to 1011 (13) 4 scan half flag 6-7 land/water flag 0 top half 1 bottom half % % % % % % % % Note: The orbit number is not the absolute orbit number but a relative orbit number in the file. In addition a flag is stored which distinguishes between observations which are in the top half of the scan (the first 5 1-km scan lines in the along track direction) and the bottom half of the scan (the last 5 1-km scan lines). The observation coverage is the area of intersection of observation footprint and cell divided by the area of the observation. 28
29 9. Useful links a) 250-m Pointer Files (MODPTQKM) Link: b) 500-m Pointer Files (MODPTQKM) Link: 29
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