Level 2 Fire Product
MOD14 (Terra) and MYD14 (Aqua)
This is the most basic fire product in which active fires and other
thermal anomalies, such as volcanoes, are identified. The Level 2 product
is defined in the MODIS orbit geometry covering an area of approximately
2340 by 2030 km in the across- and along-track directions, respectively.
It is used to generate all of the higher-level fire products, and contains
the following components:
- an active fire mask that flags fires and other
relevant pixels (e.g. cloud);
- a pixel-level QA image that includes
19 bits of QA information about each pixel;
- a fire pixel table which provides
19 separate pieces of radiometric and internal-algorithm information about
each fire pixel detected within a granule;
- extensive mandatory and product-specific metadata;
- a grid-related data layer to simplify production of the Climate Modeling Grid
(CMG) fire product (see below).
Product specific metadata within the Level 2 fire
product includes the number of cloud, water, non-fire, fire, unknown, and other
pixels occurring within a granule to simplify identification of granules
containing fire activity.
The image to the right shows an example of the active fire mask for the
Terra granule acquired on 19 August 2002 at 03:00. In this image, water is shown
in blue, clouds in violet, non-fire land pixels in grey,
and fire pixels in white. The bottom edge of the image points in the
satellite's along-track direction.
Level 2G Daytime and Nighttime Fire Products
MOD14GD/MOD14GN (Terra) and MYD14GD/MYD14GN (Aqua)
The Level 2 active fire products sensed over daytime and nighttime periods are binned
without resampling into an intermediate data format referred to as Level 2G.
The Level 2G format provides a convenient geocoded data structure for
storing granules and enables the flexibility for subsequent temporal
compositing and reprojection.
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Level 3 8-Day Daily Composite Fire Product
MOD14A1 (Terra) and MYD14A1 (Aqua)
The MODIS daily Level 3 fire product is tile-based, with each product file
spanning one of the 460 MODIS tiles, of which 326 contain land pixels. The
product is a 1-km gridded composite of fire pixels detected in each grid
cell over each daily (24-hour) compositing period.
For convenience, eight days of data are packaged into a
single file.
The image on the right shows the fire mask for 9 October 2001
from the 8-15 October 2001 daily Level 3 fire product (version 3). The tile
is located in Northern Australia (H31V10).
In this image, water is shown
in blue, clouds in violet, non-fire land pixels in grey,
"unknown" pixels in yellow, and fire pixels in white.
Note that the current version 4 algorithm yields many fewer "unknown"
class (yellow) pixels.
Level 3 8-Day Summary Fire Product
MOD14A2 (Terra) and MYD14A2 (Aqua)
The MODIS daily Level 3 8-day summary fire product is tile-based, with each product file
spanning one of the 460 MODIS tiles, of which 326 contain land pixels. The
product is a 1-km gridded composite of fire pixels detected in each grid
cell over each 8-day compositing period.
The image on the right shows the 8-day summary fire mask from the
8-15 October 2001 8-day Level 3 fire product (version 3). The tile
is located in Northern Australia (H31V10).
As in the previous image, water is shown
in blue, clouds in violet, non-fire land pixels in grey,
"unknown" pixels in yellow, and fire pixels in white.
Note that the current version 4 algorithm yields many fewer "unknown"
class (yellow) pixels.
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MODIS Global Daily Fire QA Products
Daily, coarse-resolution (5 and 20 km) global summary fire imagery indicating
areas in which active fires were detected. This product is generated by
Land Discipline QA on a periodic basis, and is available from the
MODIS Land
Global Browse web site. An example is shown below, at
greatly reduced resolution, with fires colored red, water in dark
blue, clear land in green, clouds in cyan, and missing data in white.
0.25 Degree Climate Modeling Grid Fire Products
Daily and monthly gridded summaries of fire pixels intended for use in regional and
global modeling. These products will be released in late 2003 or early 2004.
Experimental Climate Modeling Grid Fire Products
Monthly gridded statistical summaries of consolidated fire pixels intended
for use in regional and global modeling. These products are currently
experimental.
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