WEBVTT
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An Introduction to MODIS
Version 6 Data.

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Presented by the Land
Processes Distributed Active

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Archive Center (LP DAAC).
The Moderate Resolution Imaging

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Spectroradiometer, or MODIS

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instrument operates on both
NASA’s Terra and Aqua spacecraft.

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The orbit of each spacecraft
allow MODIS to capture the

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entire Earth every one to two
days, providing data products

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with spatial resolution ranging
from 250 to 5,600 meters.

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The LP DAAC currently
distributes more than 100

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MODIS Version 6 products
covering Surface Reflectance,

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Temperature, and more.
This video will cover how to

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learn more about MODIS
Version 6 data using the

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LP DAAC website, the MODIS
File Naming Convention,

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and the external metadata.
One of the first places to

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learn more about MODIS
Version 6 data is the LP DAAC’s

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website, lpdaac.usgs.gov.
In-depth information about

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MODIS Version 6 data can be
found under the “Dataset 

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Discovery” tab. Hover over
“Dataset Discovery”, then

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hover over “MODIS” and click
on the “MODIS Products Table”.

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The “MODIS Products Table”
lists all of the MODIS products

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distributed by NASA’s LP DAAC.
Click on the “Version 6” tab

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to see the MODIS Version 6
products. The table provides

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information on the product
short name, the dataset,

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the product, the pixel size,
and the temporal granularity.

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The searchable table allows
users to search for specific

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data products in the MODIS
product table. For example,

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type in “leaf” to bring up
Leaf Area Index data from

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the Terra satellite (MOD),
the Aqua satellite (MYD),

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and data that are combined
from both satellites (MCD).

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Type in the specific short
name of a product to find

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that product. For example,
type in MOD09A1. Clicking on

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the hyperlinked name leads
to more product information.

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All of the MODIS Version 6
Digital Object Identifier 

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(DOI) Landing Pages have the
same layout. At the top of

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the DOI Landing Page is the
product short name and the

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product long name. The
“Description” section

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contains a brief description
of the product, as well as

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any improvements or changes
since the previous version

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of the product. The
description section also

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contains the necessary
information for properly

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citing the data product
and a citation generator.

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To the right of the
description section is a

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visual example of the
product tile, a brief

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informational outline about
the product, and the tools

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that can be used to access
the data. The next section of

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the DOI landing page describes
“Characteristics” of the data,

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including high level
information about the collection

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or product family and the
granules in the collection.

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Below that is information about
each of the data layers

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contained in the Hierarchical
Data Format (HDF) file.

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This section also provides
links to information about

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the product quality, which
looks at quality control

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aspects of each pixel in
the product, and any known

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issues with the data. The
third section provides links

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to documentation that relates
to that specific data product.

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These documentation sources
include the User Guide which

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provides a more in-depth and
up-to-date explanation of the

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product and the Algorithm
Theoretical Basis Document

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(ATBD) which provides
descriptions of the algorithms

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and calculations that are
fundamental to the product.

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The fourth section lists the
data tools that provide users

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with access to download and
explore the data product.

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This section also contains
data service tools that allow

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users to manipulate data
before downloading any files.

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Some of these services
include reprojection,

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subsetting the data layers,
and downloading data in a

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different file format.
The final section provides

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resources from the E-Learning
page. These resources include

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tutorials, use cases, scripts,
videos, and past webinars and

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presentations that relate to
the data product.

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The E-Learning table is
searchable. For example, type

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“AppEEARS” in the search bar
to bring up the E-Learning

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resources that relate to the
product and AppEEARS. In this

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case, the resources include a
video about accessing MODIS

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data with AppEEARS and a
python tutorial on using

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the AppEEARS Quality Service
to decode MODIS quality

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information. Now that the
product information on the

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LP DAAC website has been
explained, information on how

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to read the MODIS filename
will be discussed. The MODIS

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filename itself can tell users
a lot about the granule without

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needing to preview it. Here is
an example of a Granule ID.

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The first part of the
Granule ID is the product

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short name. The second part
indicates the Julian date of

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acquisition. The third part
indicates the location of the

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granule, based on the MODIS
sinusoidal Horizontal-Vertical

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tile system. The H/V grid is
accessible on the MODIS overview

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page on the LP DAAC’s website.
The fourth part indicates the

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product version. The fifth part
indicates the Julian date of

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production including the year,
day, hours, minutes, and seconds.

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The last part is the file format.
MODIS Version 6 are provided as

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an HDF file. Another great place
to find information about the

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data is the external metadata
file in XML format. The XML

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file is available through any
data access client used to

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download MODIS Version 6 data.
The metadata is data about

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the data. It provides useful
information about a specific

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granule. The metadata includes
the data product DOI link,

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which is needed to properly
cite the data. It also provides

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information ranging from the
granule’s corner coordinate

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boundaries to the input
granules for multiday products.

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Thank you for watching our
video. To learn more about

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MODIS Version 6 please visit
our website at lpdaac.usgs.gov.