Choosing a data access tool: The Application for Extracting and Exploring
Analysis Ready Samples or AρρEEARS. 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, SD.
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 AρρEEARS.
AρρEEARS is great for providing access to analysis-ready data from Aqua and Terra Moderate
Resolution Imaging Spectro-radiometer MODIS and Web-Enabled Landsat data WELD
data products in the LP DAAC data Pool. The LP DAAC has deployed (Open-source Project
for a Network data Access Protocol) or 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.
During this video we will be answering these questions based on using the data access tool: AρρEEARS.
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?
And when do you need your data and how do you want it delivered?
What type of data are you looking for? AρρEEARS provides access to tiled MODIS data,
as well as conterminous United States CONUS and Alaska WELD data.
From the “Help” tab you can view the products currently available in AppEEARS.
What is your area size and how much data do you need? With AρρEEARS you can retrieve
pixel values for point locations over a time series for several layers. There are no restrictions
to the number of points you can request in a sample, nor are there any data download limits.
Do you need to see your data before you download it? You can explore the pixel values
of your input point locations within the AρρEEARS application before you download the data.
Using AρρEEARS you can compare the data values for the various layers that you have chosen.
You can also view and filter data based on quality information.
Do you need to reformat, reproject, or subset your data?
AρρEEARS provides you with a CSV file
containing the extracted pixel values for your requested point locations in their native projection.
It allows you to subset your data to only retrieve your pixels of interest.
You cannot reformat nor reproject your data using the AppEEARS application.
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.
The time for AρρEEARS to process your request depends on the amount of data you have requested.
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 immediately provide
you with an analysis-ready data download bundle.
All data output files will be tied to the sample name you previously selected.
The data download bundle includes a granule list, a CSV file of your total results,
CSV 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.
Thank you for watching our videos. Please visit the LP DAAC website at lpdaac.usgs.gov
for more information on AppEEARS and our other Data Access tools.