Choosing a Data Access Tool: AppEEARS Area Sampler

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Detailed Description

This video focuses on the Application for Extracting and Exploring Analysis Ready Samples (AρρEEARS) Area Sampler. With AρρEEARS, users can retrieve analysis ready data for specific areas of interest for a variety of NASA data products, including those derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard NASA’s Terra and Aqua satellites. AρρEEARS Area Sampler enables users to subset one or more geographic areas (polygons) temporally and by layer, as well as mosaic, reformat, and reproject the data in one simple step. AρρEEARS can be accessed via https://lpdaacsvc.cr.usgs.gov/appeears/

The National Aeronautics and Space Administration’s (NASA) Land Processes Distributed Active Archive Center (DAAC) is one of twelve NASA Earth Observing System Data and Information System (EOSDIS) DAACs. It is located at the U. S. Geological Survey's (USGS) Earth Resources Observation and Science (EROS) center in Sioux Falls, South Dakota. The LP DAAC ingests, archives, processes, and distributes NASA earth science land processes data and information. For more information about the LP DAAC, please visit https://lpdaac.usgs.gov/.

Details

Date Taken:

Length: 00:06:22

Location Taken: US

Video Credits: Content created by Cole Krehbiel (Contractor to USGS EROS)

Transcript

Choosing a Data Access Tool:
The Application for Extracting

and Exploring Analysis Ready
Samples or AρρEEARS Area

Sampler.
Presented by the LP DAAC.

NASA’s Land Processes Distributed
Active Archive Center,

or LP DAAC is one of twelve
NASA Earth Observing System

Data and Information System
EOSDIS DAACs. It is located

at the USGS EROS center in
Sioux Falls, South Dakota.

The LP DAAC ingests, archives,
and processes NASA earth

science land processes data
and information. It also

distributes the data through
a variety of data access tools

that can help you find the
data you need.

This video will be focusing
on the new functionality in

AρρEEARS for extracting
Area Samples.

The LP DAAC has deployed
OPeNDAP services to allow

access to this data.
OPeNDAP services enable you

to pull pixel values via
HTTP requests.

Middleware services have been
developed to interact with

OPeNDAP services. The AρρEEARS
web application provides

access to these services.
Leveraging these web services,

AρρEEARS provides access to
analysis-ready data from a

variety of NASA datasets,
allowing users to subset

spatially, temporally, and
by band or layer.

During this video we will be
answering these questions

based on using the data
access tool: AρρEEARS

Area Sampler.

What type of data are you
looking for? What is your

area size and how much data
do you need? Do you need to

see your data before you
download it? Do you need

to reformat, reproject, or
subset your data? When do

you need your data and how
do you want it delivered?

What type of data are you
looking for? Available datasets

include Aqua, Terra, and
Combined MODIS land products,

GPW UN-Adjusted population,
SRTM Digital Elevation Model,

and WELD data products. All
of our data products include

quality data that are included
in your request output.

Terra and Aqua MODIS snow
cover data and the GPW data

are provided in collaboration
with the National Snow and

Ice Data Center and the
Socioeconomic Data and

Applications Center. 
New products are continuously

being added to AppEEARS as
well. From the “Help” tab

you can view the most
up-to-date list of products

currently available in
AppEEARS. Click on the product

name links for more
information on a specific product.

What is your area size and
how much data do you need?

With the AρρEEARS Area Sample
function, you can retrieve

time series data for areas
anywhere on the globe for a

defined set of layers. 
Do you need to see your data

before you download it?
You can explore the summary

statistics from your region
of interest within the

AρρEEARS application before
you download the data.

You can also download the
summary statistics, which

are provided by region of
interest, dataset, and

observation. You can also
view quality information

associated with your data. 
Do you need to reformat,

reproject, or subset your
data? You can define your

region of interest by uploading
a shapefile or geojson file

into the AppEEARS Extract Area
Sample page, or use the map on

the right to draw a polygon or
bounding box for your desired

study area. 
You can subset your time

period of interest by defining
the Start and End Dates for

your request.
To subset by band, search for

your product of interest and
select it. From there, you

will see a list of available
bands that you can select for

your request. Also, AρρEEARS
Area Sampler provides you

with a list of output options
for your sample request.

You can request the output
files to be in GeoTIFF or

NetCDF-4 format for your
requested products in either

their native projection,
or reproject to a list of

coordinate reference
systems allowed. All

transformations use
nearest neighbor resampling.

If your region of interest
spans multiple tiles for

a requested product,
AppEEARS will mosaic the

tiles in order to generate
your results. The list of

projections includes all
projections native to

datasets available in
AppEEARS.

When do you need your
data and how do you want

it delivered? Your request
will be processed after

you have named and
submitted your sample request.

You will receive an email
notifying you of a successful

submission. The time for
AρρEEARS to process your

request depends on the
amount of data you have

requested. You will receive
an additional email once

your request is completed.
Options to visualize and

download your results will
appear in the AρρEEARS

“Explore” page once your
request has been completed.

Once you have selected to
download your data, AρρEEARS

will redirect you to the
Download Area Sample Page.

All data output files can
be found in the table of

files below. AppEEARS also
provides the quality layers

associated with your
requested datasets for you

to download as well. 
The supporting files

provided include a granule
list, CSV files with quality

information and summary
statistics, and metadata XML

files for the results of
each of the specific products

you have chosen, a readme
text file, and a JSON file

to share the request
parameters with your

colleagues. On the download
page, you can choose to

download a single file or
bulk download all of your

results.
Here is an example of an

AppEEARS output and the
associated quality layer.

Thank you for watching our
videos. If you are interested

in AppEEARS for Point
Extraction, be sure to check

out our ‘Choosing a Data
Access Tool: AppEEARS’ video.

Please visit the LP DAAC
website at lpdaac.usgs.gov

for more information about
AppEEARS and our other

data access tools.