MOD09_UserGuide
MOD09 (Surface Reflectance) User’s Guide
MODIS Land Surface Reflectance Science Computing Facility Principal Investigator: Dr. Eric F. Vermote
Web site: https://www.sodocs.net/doc/e510417659.html,
Correspondence e-mail address: mod09@https://www.sodocs.net/doc/e510417659.html,
Prepared by E. F. Vermote and S. Y. Kotchenova
Version 1.1
March, 2008
Table of Contents
1. Product description (4)
2. List of products (4)
3. Differences between Collection 4 and Collection 5 (5)
4. Data ordering (& browsing) (5)
5. Data viewing tools (6)
6. Data product granule ID (6)
7. Data product grids (7)
7.1. MODIS sinusoidal grid (7)
7.2. Climate Modeling Grid (CMG) (8)
8. Data product structure (9)
8.1. Description and Science Data Sets (Collection 5) (9)
8.1.1. MOD09GQ / MYD09GQ (9)
8.1.2. MOD09GA / MYD09GA (10)
8.1.3. MOD09Q1 / MYD09Q1 (12)
8.1.4. MOD09A1 / MYD09A1 (13)
8.1.5. MOD09CMG / MYD09CMG (14)
8.2. Description and Science Data Sets (Collection 4) (16)
8.2.1. MOD09GQK / MYD09GQK (16)
8.2.2. MOD09GHK / MYD09GHK (17)
8.2.3. MOD09Q1 / MYD09Q1 (18)
8.2.4. MOD09A1 / MYD09A1 (19)
8.2.5 MOD09GST / MYD09GST (20)
8.3. Data product quality (21)
8.3.1. 250-m resolution QA (21)
8.3.2. 500-m and coarse resolution QA (22)
8.4. Data product state flags (23)
8.4.1. 500-m and 1-km resolution data state QA (Collection 5) (23)
8.4.2. 1-km resolution data state QA (Collection 4) (24)
8.5. Geolocation flags (Collection 5) (25)
8.6. Scan value information (Collection 5) (26)
8.7. Internal climatology (Collection 5) (27)
8.8. Orbit and coverage (Collection 4) (28)
9. Useful links (29)
If there is something else you would like to see in the MOD09 User's Guide, please write to us at mod09@https://www.sodocs.net/doc/e510417659.html,. 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 de-tailed description of these changes can be found at the MODIS Land Quality Assessment Web site (https://www.sodocs.net/doc/e510417659.html,/cgi-bin/QA_WWW/newPage.cgi).
b) Please check the product availability on our Web site at https://www.sodocs.net/doc/e510417659.html,.
1. Product description
MOD09 (MODIS Surface Reflectance) is a seven-band product computed from the MODIS Level 1B land bands 1 (620-670 nm), 2 (841-876 nm), 3 (459-479), 4 (545-565 nm), 5 (1230-1250 nm), 6 (1628-1652 nm), and 7 (2105-2155 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 scatter-ing or absorption. It corrects for the effects of atmospheric gases, aerosols, and thin cirrus clouds.
2. List of products
Collection 4
Product Abbreviation
Product Full Name
Terra Aqua Surface Reflectance Daily L2G Global 250 m MOD09GQK MYD09GQK Surface Reflectance Daily L2G Global 500 m MOD09GHK MYD09GHK Surface Reflectance 8-Day L3 Global 250 m MOD09Q1 MYD09Q1
Surface Reflectance 8-Day L3 Global 500 m MOD09A1 MYD09A1
Surface Reflectance Quality Daily L2G Global 1km MOD09GST MYD09GST
Collection 5
Product Abbreviation
Product Full Name
Terra Aqua Surface Reflectance Daily L2G Global 250 m MOD09GQ MYD09GQ Surface Reflectance Daily L2G Global 500 m and 1 km MOD09GA MYD09GA Surface Reflectance 8-Day L3 Global 250 m MOD09Q1 MYD09Q1
Surface Reflectance 8-Day L3 Global 500 m MOD09A1 MYD09A1
Surface Reflectance Daily L3 Global 0.05Deg CMG* MOD09CMG MYD09CMG
*CMG – Climate Modeling Grid
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 Reflectance Quality product at 1-km resolution was incorporated into the Daily Surface Reflectance product at 500-m resolution.
b) The Daily Surface Reflectance products at 500-m and 1-km resolution have new abbreviated names.
c) A new product called Global Daily Surface Reflectance at 0.05° resolution was created. This prod-uct 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:https://www.sodocs.net/doc/e510417659.html,/pub/imswelcome/
b)LP DAAC (Land Processes Distributed Active Archive Center)
Useful information and links, ftp-access to a subset of MODIS land products.
Link:https://www.sodocs.net/doc/e510417659.html,/main.asp
c)US Geological Survey (USGS) Global Visualization (GloVIS)
Access to selected MODIS land products with browse capability.
Link:https://www.sodocs.net/doc/e510417659.html,/
d) MODIS Land Global Browse Images
5-km versions of selected product to enable synoptic quality assessment.
Link:https://www.sodocs.net/doc/e510417659.html,/cgi-bin/browse/browse.cgi
e)Earth Science Data Interface (ESDI) at the Global Land Cover Facility
32-day composites, images in GeoTiff format, limited products.
Link:https://www.sodocs.net/doc/e510417659.html,/index.shtml
5. Data viewing tools
a)Imager (platform: Linux)
A software tool specifically designed by the MODIS LSR SCF for viewing surface reflectance suites. Link:https://www.sodocs.net/doc/e510417659.html,/MAIN_MODIS_SOFTWARE/IMAGER.html
b)HDFLook (platforms: SUN, AIX, SGI, Linux, MacOSX, Cygwin)
A multifunctional data processing and visualization tool for land, ocean and atmosphere MODIS data. Link:http://www-loa.univ-lille1.fr/Hdflook/hdflook_gb.html
c)ENVI (platforms: Windows & Linux)
A software for the visualization, analysis, and presentation of all types of digital imagery.
Link:https://www.sodocs.net/doc/e510417659.html,/envi/
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:https://www.sodocs.net/doc/e510417659.html,/
6. Data product granule ID
Example 1: MOD09GHK.A2006351.h18v06.004.2006353163945.hdf
MOD09GHK: product name (MODIS Terra Surface Reflectance Daily L2G Global 500 m)
A2000351: Acquisition year (2006) and Julian day (351)
h18v06: tile ID (see MODIS sinusoidal grid)
004: Collection 4
2006353163945: Production year (2006), Julian day (353), and time (16:39:45)
Example 2: MOD09CMG.A2000338.005.2006332091104.hdf
MOD09CMG: product name (MODIS Terra Surface Reflectance Daily L3 Global 0.05Deg. CMG)
A2000338: Acquisition year (2000) and Julian day (338)
005: Collection 5
2006332091104: Production year (2006), Julian day (332), and time (09:11:04)
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.A2000337.h11v05.005.2006342055602.hdf.
7.2. Climate Modeling Grid (CMG)
The resolution of CMG is 0.05°. 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, 2000. The product granule ID is MOD09CMG.A2000338.005.2006332091104.hdf.
8. Data product structure
8.1. Description and Science Data Sets (Collection 5) 8.1.1. MOD09GQ / MYD09GQ
MODIS Terra/Aqua Surface Reflectance 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.A2000339.h10v05.005.2006339053418.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
integer
-10 - 127NA
250m Surface Reflectance Band 1 (620-670 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
250m Surface Reflectance Band 2 (841-876 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
250m Reflectance Band Quality (see Table 11) Bit Field
16-bit unsigned
integer
29950 - 4096NA
obs_cov: Observation Coverage
(percentage of the grid cell area covered by the observation)Percent
8-bit signed
integer
-10 - 100
(0.001)
0.0099999997
76482582
8.1.2. MOD09GA / MYD09GA
MODIS Terra/Aqua Surface Reflectance 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.A2000340.h11v05.005.2006339102700.hdf
Table 2. Science Data Sets for MOD09GA / MYD09GA.
Data Group Science Data Sets
(HDF Layers (21))
Units Bit Type Fill Value Valid Range
Scale Fac-
tor
1 km num_observations_1km:
Number of Observations
NA
8-bit signed
integer
-10 - 127NA
State_1km: Reflectance
Data State (see Table 13 )
Bit Field
16-bit unsigned
integer
655350 - 57335NA Sensor Zenith Angle Degree
16-bit signed
integer
-327670 - 180000.01 Sensor Azimuth Angle Degree
16-bit signed
integer
-32767-18000 - 180000.01 Range: pixel to sensor Meter
16-bit unsigned
integer
6553527000 - 6553525 Solar Zenith Angle Degree
16-bit signed
integer
-327670 - 180000.01 Solar Azimuth Angle Degree
16-bit signed
integer
-32767-18000 - 180000.01 gflags: Geolocation flags
(see Table 15 )
Bit Field
8-bit unsigned
integer
2550 - 248NA orbit_pnt: Orbit Pointer none
8-bit signed in-
teger
-10 - 15NA
**********************************************************************
500 m num_observations_500m none 8-bit signed
integer
-10 - 127NA
sur_refl_b01: 500m Surface
Reflectance Band 1 (620-670 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b02: 500m Surface
Reflectance Band 2 (841-876 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b03: 500m Surface
Reflectance Band 3 (459-479 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b04: 500m Surface
Reflectance Band 4 (545-565 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b05: 500m Surface
Reflectance Band 5 (1230-1250 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b06: 500m Surface
Reflectance Band 6 (1628-1652 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
sur_refl_b07: 500m Surface
Reflectance Band 7 (2105-2155 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
QC_500m: 500m Reflec-
tance Band Quality (see Table 12)Bit Field
32-bit unsigned
integer
787410671
0 -
4294966019
NA
Obs_cov_500m: Observa-tion coverage Percent
8-bit signed
integer
-10 - 100
(0.01)
0.00999999
77648258
iobs_res: Observation num-ber none
8-bit unsigned
integer
2550 - 254NA
q_scan: 250m scan value information (see Table 16)Bit Field
8-bit unsigned
integer
2550 - 255NA
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.A2000337.h10v05.005.2006342044337.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))
Units Bit Type Fill Value Valid Range Scale Factor
250m Surface Reflectance
Band 1 (620-670 nm)
Reflectance 16-bit signed integer -28672 -100 - 16000 0.0001
250m Surface Reflectance
Band 2 (841-876 nm)
Reflectance 16-bit signed integer -28672 -100 - 16000 0.0001
250m Reflectance Band Quality (see Table 11) Bit Field
16-bit unsigned
integer
65535 0 - 32767 NA
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.A2000337.h11v05.005.2006342055602.hdf
Table 4. Science Data Sets for MOD09A1 / MYD09A1
Science Data Sets (HDF Layers (13))Units Bit Type Fill Value Valid Range
Scale
Factor
500m Surface Reflectance
Band 1 (620-670 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 2 (841-876 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 3 (459-479 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 4 (545-565 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 5 (1230-1250 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 6 (1628-1652 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Surface Reflectance
Band 7 (2105-2155 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001
500m Reflectance Band
Quality (see Table 12)
Bit Field32-bit unsigned integer42949672950 - 4294966531NA Solar Zenith Angle Degree16-bit signed integer00 - 180000.01 View Zenith Angle Degree16-bit signed integer00 - 180000.01 Relative Azimuth Angle Degree16-bit signed integer0-18000 - 180000.01 500m State Flags (see Ta-
ble 13)
Bit field16-bit unsigned integer655350 - 57343NA Day of Year Julian day16-bit unsigned integer65535 1 - 366NA
8.1.5. MOD09CMG / MYD09CMG
MODIS Terra/Aqua Surface Reflectance 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, 2000. The MODIS product granule ID is
MOD09CMG.A2000341.005.2006347161131.hdf.
Table 5. Science Data Sets for MOD09CMG / MYD09CMG.
Science Data Sets (HDF Layers (19))Units Bit Type
Fill
Value
Valid Range
Scale
Factor
Coarse Resolution Surface Reflectance Band 1 (620-670 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 2 (841-876 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 3 (459-479 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 4 (545-565 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 5 (1230-1250 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 6 (1628-1652 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Surface Reflectance Band 7 (2105-2155 nm)Reflectance
16-bit signed
integer
-28672-100 - 160000.0001
Coarse Resolution Solar Zenith Angle Degree 16-bit signed
integer
00 - 180000.01
Coarse Resolution View Zenith Angle Degree 16-bit signed
integer
00 - 180000.01
Coarse Resolution Relative Azimuth Angle Degree
16-bit signed
integer
0-18000 - 180000.01
Coarse Resolution Ozone cm atm 8-bit unsigned
integer0
0 -255400
Coarse Resolution Brightness Tempera-ture Band 20 (3.360-3.840 μm)degrees K
16-bit un-
signed integer
00 - 40000100
Coarse Resolution Brightness Tempera-ture Band 21 (3.929-3.989 μm)degrees K
16-bit un-
signed integer
00 - 40000100
Coarse Resolution Brightness Tempera-ture Band 31 (10.780-11.280 μm)degrees K
16-bit un-
signed integer
00 - 40000100
Coarse Resolution Brightness Tempera-ture Band 32 (11.770-12.270 μm)degrees K
16-bit un-
signed integer
00 - 40000100
Coarse Resolution Granule Time HHMM16-bit integer00 - 23551
Coarse Resolution QA (see Table 12)Bit Field 32-bit un-
signed integer
00 - 1073741824NA
Coarse Resolution Internal CM (see Table 17)Bit Field
16-bit un-
signed integer
0 1 - 8191NA
Averaged Number of Pixels unitless 8-bit unsigned
integer
0 1 - 40NA
8.2. Description and Science Data Sets (Collection 4)
8.2.1. MOD09GQK / MYD09GQK
MODIS Terra/Aqua Surface Reflectance 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.A2004148.h12v09.004.2004151002653.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 6. Science Data Sets for MOD09GQK / MYD09GQK
Science Data Sets (HDF Layers) (5)Units Data Type
Fill
Value
Valid Range
Scale Fac-
tor
(divide by)
250m Surface Reflectance Band 1
(620-670 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 250m Surface Reflectance Band 2
(841-876 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 250m Reflectance Band Quality
(see Table 11)
Bit field16-bit unsigned integer29950 - 4096NA Orbit and coverage (see Table 18)Bit field8-bit unsigned integer150 - 255NA Number of Observations NA8-bit signed integer-10 - 127NA
8.2.2. MOD09GHK / MYD09GHK
MODIS Terra/Aqua Surface Reflectance Daily L2G Global 500 m
Product description: MOD09GHK (MYD09GHK) provides surface reflectance data at 250-m resolu-tion 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.A2006351.h18v06.004.2006353163945.hdf
Table 7. Science Data Sets for MOD09GHK / MYD09GHK
Science Data Sets (HDF Layers (10))Units Data Type Fill Value Valid Range
Scale Factor
(divide by)
250m Surface Reflectance
Band 1 (620-670 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 250m Surface Reflectance
Band 2 (841-876 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 500m Surface Reflectance
Band 3 (459-479 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 500m Surface Reflectance
Band 4 (545-565 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 500m Surface Reflectance
Band 5 (1230-1250 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 500m Surface Reflectance
Band 6 (1628-1652 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000 500m Surface Reflectance
Band 7 (2105-2155 nm)
Reflectance16-bit signed integer-28672-100 - 1600010000
500m Reflectance Band Quality (see Table 12)Bit field
32-bit unsigned inte-
ger
7874106710 - 4294967296NA
Orbit and coverage Bit field8-bit unsigned integer150 - 255NA Number of Observations NA8-bit signed integer-10 - 127NA
8.2.3. MOD09Q1 / MYD09Q1
MODIS Terra/Aqua Surface Reflectance 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.A2004145.h12v10.004.2004157154243.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))
Units Data Type Fill Value Valid Range Scale Factor Surface Reflectance for band
1 (620-670 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001 Surface Reflectance for band
2 (841-876 nm)
Reflectance16-bit signed integer-28672-100 - 160000.0001 Surface reflectance 250m
quality control flags (see Ta-ble 11)Bit field
16-bit unsigned
integer
655350-4294966531NA
8.2.4. MOD09A1 / MYD09A1
MODIS Terra/Aqua Surface Reflectance 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.A2004145.h12v10.004.2004157154243.hdf.
Table 9. Science Data Sets for MOD09A1 / MYD09A1
Science Data Sets (HDF Layers (13)) Units Data Type-bit Fill Value Valid Range
Scale
Factor
Surface Reflectance for band 1
(620-670 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 2
(841-876 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 3
(459-479 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 4
(545-565 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 5
(1230-1250 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 6
(1628-1652 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface Reflectance for band 7
(2105-2155 nm)
reflectance16-bit signed integer -28672 -100 - 16000 0.0001 Surface reflectance 500m qual-
ity control flags (see Table 12)
Bit field 32-bit unsigned integer 4294967295 0 - 4294966531 NA Solar zenith Degree 16-bit signed integer 0 0 - 18000 0.01 View zenith Degree 16-bit signed integer 0 0 - 18000 0.01 Relative azimuth Degree 16-bit signed integer 0 -18000 - 18000 0.01 Surface reflectance 500m state
flags (see Table 13)
Bit field 16-bit unsigned integer 65535 0 NA Surface reflectance day of year Julian Day16-bit unsigned integer 65535 0 - 366 NA
8.2.5 MOD09GST / MYD09GST
MODIS Terra/Aqua Surface Reflectance Quality Daily L2G Global 1 km
Product description: MOD09GST is a restructured version of the quality data in level-2 surface re-flectance. It summarizes the quality of the MOD09 products, including atmospheric and other correc-tion 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
Figure 12. The table above interprets the colors
used to display the MOD09GST surface reflec-tance data state product over MODIS tile h08v06 covering northern Mexico on April 4, 2000.
MOD09GHK RGB-image
Corresponding information from MOD09GST
Table 10. Science Data Sets for MOD09GST / MYD09GST
Science Data Sets (HDF Layers (3))
Units Data Type-bit Fill Value Valid Range 1km Reflectance Data State QA (see Table 14 ) Bit field 16-bit unsigned integer 65535 0 - 65535 Orbit and coverage Bit field 8-bit unsigned integer 15 0 - 255 Number of Observations
NA
8-bit signed integer
-1
0 - 127