Getting Started with MODIS V6 Surface Reflectance Data Part 1

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Detailed Description

Getting Started with MODIS Version 6 Surface Reflectance Data Part 1: All About Accessing Data This video focuses on the National Aeronautics and Space Administration’s (NASA) Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Version 6 Surface Reflectance data distributed by NASA’s Land Processes Distributed Active Archive Center (LP DAAC). Information about the MODIS Version 6 Surface Reflectance products, changes between the Version 5 and Version 6 products, and how to access MODIS Version 6 Surface Reflectance data using NASA’s Earthdata Search is provided. To learn more about MODIS Version 6 Surface Reflectance data and other data products distributed by the LP DAAC please visit https://lpdaac.usgs.gov/. The LP DAAC is one of twelve NASA Earth Observing System Data and Information System (EOSDIS) DAACs. It is located at the United States Geological Survey (USGS) Earth Resources Observation Systems (EROS) Center in Sioux Falls, South Dakota. The LP DAAC ingests, archives, processes and distributes NASA Earth science land processes data and information. 
 

(Credit: Andy Dykstra, USGS (Contractor). Public domain.)

Details

Date Taken: January 2017 (approx.)

Length: 00:06:31

Location Taken: Sioux Falls, SD, US

Video Credits: Script and content created by Danielle Golon, Innovate, Inc.! for the NASA LP DAAC

Transcript

Getting Started with MODIS
Version 6 Surface Reflectance

Data Part 1:
All about Accessing the Data.

Presented by the Land Processes
Distributed Active Archive Center

(LP DAAC). This video is part 1
of the “Getting Started with MODIS

Version 6 Surface Reflectance Data”
video series. This video will cover

the MODIS Version 6 Surface
Reflectance products, changes

between the Version 5 and
Version 6 products and how to

search for and download MODIS
Version 6 Surface Reflectance

data using the Earthdata Search
Client data access tool.

The LP DAAC distributes 14 MODIS
Version 6 Surface Reflectance

products. Detailed information
about individual products can be

found on the LP DAAC website.
These products provide daily and

8-day coverage, with a spatial
resolution ranging from 250 to

5,600 meters. MODIS Version 6
surface reflectance data products

are tiled and are available in
sinusoidal projection or are

Global Climate Modeling Grid (CMG)
products that are projected to a

latitude-longitude grid. 

MODIS Version 6 data are a normal

reprocessing of MODIS data to
provide users with an improved

product. The MODIS Version 6
Surface Reflectance data products

contain many improvements over
the previous Version 5 products. 

These updates include improvements
in aerosol retrieval and the

aerosol correction algorithm and
refinements to internal snow,

cloud, and cloud shadow detection
algorithms. There are also

improvements in discrimination of
salt pans from clouds and snow,

with the addition of a salt pan
flag in the Quality Assurance

information. Finally, the LP DAAC
is now distributing a new Aqua

and Terra Daily 1-km Ocean
Reflectance product.

The LP DAAC website provides
information about how to download

MODIS Version 6 Surface
Reflectance data. At the bottom

of the Digital Object Identifier
(DOI) Landing Page are links to

the tools that users can use to
download that specific data product.

Today’s data access demonstration
will provide step-by-step

information for downloading data
using NASA’s “Earthdata Search”.

All data distributed by the
LP DAAC is available at no charge.

From the Earthdata Search home
page, click on the 

“Earthdata Login” button to login
with your NASA Earthdata account.

If you do not have an Earthdata
account, click on the login button

and follow the prompt to create
one. Now, search for the Terra

MODIS Version 6 8-Day Surface
Reflectance 500 meter level 3

gridded product, MOD09A1.
Type “MOD09A1” in the search bar

and hit enter. There are several
collections that match “MOD09A1”.

Here it is important to choose
the correct dataset of interest.

Click on the MOD09A1 Version 6
data product. This will pull up

all of the MOD09A1 granules.
Parameters for a specific time

and location can be set above
the map. Set the parameters to

the county of Switzerland during
the month of September in the

year 2016. First, pan and zoom
the map to Switzerland. Change

the temporal range by clicking
on “Temporal” and then click on

the Start date and change to
“September 1, 2016.”

Change the End date to
“September 30, 2016.”

Now click on apply filter.
To change the spatial information,

click on “Spatial” and select
“rectangle” from the drop down menu.

Draw a rectangle around Switzerland.
You will now see a green outline

that indicates the footprint of
the Terra MODIS tile. The

September 2016 granules that are
located in the selected area are

now listed in the lower left hand
corner. Above the granule list are

the options to “Retrieve Collection
Data” which allows a user to

download all of the matching
granules, an “I” icon to learn

more about the data collection,
a filter icon to further filter

the data, and a plus sign icon,
which allows a user to add multiple

data products to their Earthdata
Search project. Click on the first

box in the lower left hand corner
list to select the most recent scene

in the list. This box contains a
preview of the granule, the Terra

MODIS filename, the dates of the
data, an “x” to remove the scene

from your granule list, an “I”
for more information, and the

retrieval icon to download a
single granule. Click on the

“I” icon, this will bring up the
metadata for the selected granule.

Remember, metadata are data
about data, including the DOI,

which is necessary for proper
citation, and information on

the scene’s corner coordinates,
input granules, and more. Click

on the “Metadata” tab for links
to download the metadata in

different standard formats.
Click on “Back to Granules” to

return to the granule list.
Click on “Retrieve Collection Data”

to download all the granules in
the granule list. Review the data

download order on the “Data Access”
page, this page lists the number

of granules in the order and the
size of the order. From here users

can select the service options.
Select “download” to instantly

receive the granules in the order
or select “Delivery Option” to

receive the granules via email.
The “MOD09A1.6 ESI Service”

option allows the user to select
various service options, including

reformatting the data from a
Hierarchical Data Format or HDF

file to a GeoTiff or other file
formats, re-projecting the data,

and subsetting the bands. Click
on “submit” or “continue” and

then “submit” to submit the order.
Depending on the data access method,

the data can be accessed
immediately or will be sent to

the user via email.

Thank you for watching our video.
For more information on MODIS

Version 6 Surface Reflectance
data please visit the LP DAAC

website at lpdaac.usgs.gov.