Documentation Revision Date: 2017-09-26
Data Set Version: 1
ORNL DAAC. 2017. MODIS Collection 6 Land Products Global Subsetting and Visualization Tool. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1379
Table of Contents
- Data Set Overview
- Data Characteristics
- Application and Derivation
- Quality Assessment
- Data Acquisition, Materials, and Methods
- Data Access
- Data Set Revisions
Data Set Overview
The MODIS Global Subsetting and Visualization Tool provides on-demand, customized subsets of several MODIS Collection 6 land products.
Subset products are made available to the user through an interactive web page. The user specifies the center point for the area of interest by entering geographic coordinates or selecting the location on a map. The user then selects the desired MODIS land product and specifies a rectangular area surrounding the center point by providing the number of kilometers "Above and Below" and "Left and Right" of the center point. In the final step, the user is given the option to receive spatial data for their order in MODIS sinusoidal or geographic (WGS84) projection and is asked to provide an email for order delivery.
Subsets are made available to the user through an order visualization page with interactive time series plots, MODIS data quality information, land cover and phenology data, order and product citations, and download access for the data in tabular and spatial data formats.
How to Cite Collection 6 Land Product Subsets:
Please refer to Section 5 of this document and to the MODIS Citation Policy page for more information on how to cite your MODIS product subsets.
The data products available through the MODIS Global Subsetting and Visualization Tool are generated by the MODIS instruments flown on NASA's Terra and Aqua satellites. Terra products are available from February 2000 to present and Aqua products are available from June 2002 to present. They are available for daily, 4-day, 8-day, 16-day, and annual composite periods at 250-m, 500-m, or 1-km resolution, depending on the product. Data in spatial file formats are available in MODIS Sinusoidal and geographic (WGS84) projections.
Please refer to the MODIS Documentation page for a list of available MODIS Collection 6 land products.
Application and Derivation
The MODIS Global Subsetting and Visualization Tool streamlines the use of MODIS data for characterization of field sites, rapid time-series visualization, validation of models and other remote sensing products, and other research activities.
The results of routine quality assessments are maintained at the MODIS Land Quality Assessment (MODLAND) site by the MODIS Land Science Team and provided through product metadata and per-pixel information for each MODIS granule.
Data Acquisition, Materials, and Methods
MODIS tiles are provided to the ORNL DAAC by the Land Processes DAAC (LP DAAC). The ORNL DAAC creates subsets and packages the data.
How to Cite Collection 6 Land Product Subsets
For your convenience, you will receive citations for your order and the MODIS product in the order delivery email. Users should include both a citation to the subsetting tool itself and a citation to the specific MODIS product(s) used as references in subsequent manuscripts. Citations for available MODIS Products are included in the references section of this document. Please refer to the MODIS Citation Policy page for more information on how to cite your MODIS product subsets.
The MODIS Global Subsetting and Visualization Tool is accessed via the link on the MODIS Get Data page. Users are required to log in with their NASA Earthdata login information before placing an order. The four steps for ordering a custom subset are described below. Clicking Back returns the user to the previous step.
Step 1. Select the location of the center point for the subset order by either clicking the map or providing latitude and longitude coordinates in decimal degrees. Click Continue.
Step 2. Select a MODIS Land Product; enter desired subset size by providing the number of kilometers Above and Below and to the Left and Right of the center point specified in Step 1. Click Continue.
Step 3. Select the temporal starting and ending dates; choose to output GeoTiff subsets in native MODIS Sinusoidal Projection, or to reproject to Geographic Lat/Long (WGS 84); provide an email address. Click Review Order.
Step 4. Review order details and click Create Subset.
An order summary with order status is displayed. The subset order is placed when the user clicks the "Create Subset" button. The user will be notified via email when the subset is ready for download and viewing.
Order Visualization and Download:
A unique URL containing the order content is provided via email. The email also provides citations to the data products and the subsetting tool.
The order viewing page contains order details, visualizations and legend, subset and QC details, citations, and download links available in the tabs at the top of the page.
- Users have the option to visualize data from individual composite dates by clicking the Visualize Subset Area by Dates button.
- Check the Stack by Year box to visualize a stacked yearly time series.
- Coarse and fine adjustments to the temporal range for Stacked and Default time series plots can be made using the sliders at the top of the page and directly below the plots.
- IGBP land cover classification, vegetation phenology, and various R plots are accessible for subset data near the bottom of the visualization page.
Please note that subset orders are deleted after 30 days.
User Order History:
A record of past orders is kept for each user at the User Order History page. Orders are listed chronologically and sortable by processing status, product, latitude, or longitude.
Classroom exercises are maintained on the MODIS Land Products Subsets page. The exercises have been provided by instructors from various institutions to help students and researchers understand the basic concepts of remote sensing as well as the use of the MODIS subsetting and visualization tools provided by the ORNL DAAC.
These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
Contact for Data Center Access Information:
- E-mail: email@example.com
- Telephone: +1 (865) 241-3952
ORNL DAAC. 2008. MODIS Collection 5 Global Subsetting and Visualization Tool. ORNL DAAC, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1241
Paper describing the ORNL DAAC MODIS Subsetting and Visualization Tool
S.K. Santhana Vannan, R.B. Cook, S.K. Holladay, L.M. Olsen, U. Dadi, B.E. Wilson. 2010. A Web-Based Subsetting Service for Regional Scale MODIS Land Products. IEEE JSTARS, 2(4): 319–328
Data Set Revisions
The MODIS Collection 6 Global Subsetting and Visualization Tool provides users the same functionality as the previous Collection 5 Tool (ORNL DAAC, 2008).