WEBVTT

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An Introduction to the AppEEARS Area Sampler.

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Presented by the Land Processes Distributed Active Archive Center or LP DAAC.

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The Application for Extracting and Exploring Analysis Ready Samples or AppEEARS provides an easy and

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quick way to access and transform geospatial data from several federal archives.

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It allows for spatial, temporal, and band and layer subsetting and provides interactive visualizations for

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each sample output.

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Using the AppEEARS Area Sample users can reproject and reformat the desired data output and

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associated quality data for user-defined areas of interest.

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Finally, Summary Statistics calculated from the extracted data are also made available to download with

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the output data files.

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This video provides a brief overview of how to submit an Area Sample request, visualize

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the output, and download the data.

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First, find the AppEEARS landing page using this URL.

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A NASA Earthdata Login account is required to use AppEEARS.

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Login with your NASA Earthdata account by clicking on the sign in button.

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Don’t worry if you do not have an account, they are freely available, and you

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can create an account using the sign in button, as well.

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Lets explore the Area Sample feature.

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In this example, we are going to look at MODIS Land Surface Temperature, Fire, and

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Vegetation data for all the National Parks in Colorado from January 1, 2015 to December 31, 2017.

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First, click Extract then Area Sample.

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There are three ways to start a sample.

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You can either start a new request, copy a previous request, or upload a JSON file

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with request parameters.

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We are going to submit an AppEEARS area request by clicking Start a new request

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and filling out the request form from scratch.

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This is the Area request form.

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First, we will name the request.

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Let’s name this request Colorado NPS 2015-2017.

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When extracting by area you can either upload a GeoJSON or an ESRI shapefile, which

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will enable you to extract multiple areas, or you can draw a polygon to extract

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a single area.

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Lets start with uploading a shapefile zip folder of the National Parks in Colorado from data.gov.

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Drag and drop the zipped folder containing the .shp, .dbf, .prj, and .shx files.

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AppEEARS allows you to subset temporally, meaning you can select the dates or reoccurring date

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range that you are specifically interested in.

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I’m going to select January 1, 2015 to December 31, 2017.

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You can also subset the data products by adding only the data layers or variables you want.

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If you want to learn more about a layer you can click on the I

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icon next to it.

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If you accidentally added a layer you can remove it by clicking on it under selected layers.

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Here you can select several layers from several different data products.

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Now I’m going to search for the rest of the data I want and add

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the layers I need.

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Next select your output options.

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You can choose to receive your data in GeoTIFF or NetCDF-4 file format and you

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have the option of either leaving your data output in their native projection or reprojecting

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to one of the projections listed below.

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When you are satisfied with the variables you’ve selected you can submit your request.

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Once your request has been successfully submitted you will receive an email to confirm that

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the request has been received and a second email when the request is complete.

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To see your request go to the Explore tab.

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This tab contains all of the requests you've submitted and includes their request details, their

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status, and links to visualize and download the data.

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Note that upon request completion you will have 30 days to view and download your request.

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After 30 days your request status will change to expired and you will need to

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reprocess it to view and download the request again.

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Once you are ready to explore the data, find your request and click on the

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graph icon to view the contents of this request.

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AppEEARS allows you to preview and interact with your data values.

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These graphs are aggregated statistics for your region of interest through time.

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For Area samples AppEEARS provides two plot types.

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A box-and-whisker for variables that contain continuous data values and stacked bar charts for categorical data values.

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The box and whisker plot illustrates the central tendency and distribution of the data values

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extracted for each input feature or area of interest through time.

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It also allows you to preview the associated quality information as stacked bar charts.

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These display the pixel counts for each quality category.

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Once you are done exploring the data you can download the output files via the

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dropdown arrow or by returning to the explore tab.

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In addition to the data extracted for your requests, AppEEARS offers a number of supporting

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or auxiliary files including ISO 19115 compliant metadata, a granule list with links to the

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source data files, a readme for additional request details, a JSON file to share and

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reproduce requests, and product specific quality lookup tables and aggregated statistics.

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Finally, the GeoTIFF or netCDF-4 files containing the extracted data values are available to download

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individually or as a bulk download.

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So there you have it, AppEEARS, an intuitive, time-saving application that provides access to geospatial

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data from a variety of federal data archives all in one place. If at any

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time you need help while using AppEEARS feel free to click Help.

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This will provide you with information on how to use AppEEARS and on what data

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products are available in AppEEARS.

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You can also always contact the LP DAAC User Services team at lpdaac at usgs.gov.

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Thank you for watching this video on the AppEEARS Area Sampler presented by the Land

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Processes Distributed Active Archive Center or LP DAAC.

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