Data Set Characteristics
Area = ~2330 X 2000 km
Size = 2 (~2030 X 1354 row/column) Average File Size = 0.4 MB
Resolution = 1 kilometer
Projection = None (swath data)
Data Type Fire Mask = 8-bit unsigned
Data Format = HDF-EOS
Science Data Sets (SDSs) = 22
Pixel Value
Classes
Color
0
missing input data
Black
1
not processed (obsolete)
Black
2
not processed (obsolete)
Black
3
water
Dk Blue
4
cloud
Lt Blue
5
non-fire
Green
6
unknown
Purple
7
fire (low-confidence)
Yellow
8
fire (nominal-confidence)
Orange
9
fire (high-confidence)
Red
Product Description
The MODerate-resolution Imaging Spectroradiometer (MODIS) Thermal Anomalies/Fire products detect fire locations using 4- and 11-micrometer brightness temperatures. The detection strategy is based on absolute detection, if the fire is strong enough, and on detection relative to the background to account for variability of the surface temperature and reflection by sunlight. Numerous tests are employed to reject typical false alarm sources such as sun glint and unmasked coastline. Because the Terra MODIS instrument acquires data twice daily (10:30 am and 10:30 pm), as does the Aqua MODIS (2:30 pm and 2:30 am), four daily MODIS observations area available to contribute to global fire monitoring.
The MODIS/Aqua Thermal Anomalies/Fire 5-Min L2 Swath product, MYD14, is the most basic data in which active fires and other thermal anomalies, such as volcanoes, are identified. It is used to generate all of the higher-level fire products.
The image shown is a browse image of the Level 2 Thermal Anomalies/Fire product, MYD14. The data was acquired on February 24, 2004 over southern Myanmar around the Gulf of Martaban, and stretching into eastern Thailand to the right. Fires are visible as red pixels. MODIS data will also be used to monitor burn scars, vegetation type and condition, smoke aerosols, water vapor and clouds for overall monitoring of the fire process and its effects on ecosystems, the atmosphere, and climate.
NOTE: These products are provisional, meaning that product quality may not be optimal. Incremental product improvements are still occurring, and users are urged to contact MODIS Science Team representatives prior to use of the data in publications. These data are likely to be replaced when the validated product becomes available.
SDS
Units
Data Type
Fill Value
Valid Range
Fire mask
Bit
8-bit unsigned integer
0
0 - 9
Algorithm QA
Bit
32-bit unsigned integer
na
na
Granule line of fire pixel
na
16-bit signed integer
na
0 - ~2030
Granule sample of fire pixel
na
16-bit signed integer
na
0 - 1354
Latitude of fire pixel
Degree
32-bit floating point
na
-90.0 – 90.0
Longitude of fire pixel
Degree
32-bit floating point
na
-180.0 – 180.0
Channel 2 reflectance of fire pixel
Reflectance
32-bit floating point
-1
0 – 120
Channel 21/22 brightness temperature of fire pixel
Kelvins
32-bit floating point
0
na
Channel 31 brightness temperature of fire pixel
Kelvins
32-bit floating point
0
na
Channel 21/22 brightness temperature of background
Kelvins
32-bit floating point
0
na
Channel 31 brightness temperature of background
Kelvins
32-bit floating point
0
na
Mean background brightness temperature difference
Kelvins
32-bit floating point
0
na
Background channel 21/22 brightness temperature mean absolute deviation
Kelvins
32-bit floating point
0
na
Background channel 31 brightness temperature mean absolute deviation
Kelvins
32-bit floating point
0
na
Background brightness temperature difference mean absolute deviation
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science Center (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001
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