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README.md

Tutorial: Access Distributed NASA Earth Science Data from OPeNDAP Services using Matlab

Author: ORNL DAAC
Date: April 10, 2018
Contact for ORNL DAAC: uso@daac.ornl.gov

Keywords: OPeNDAP, THREDDS, Matlab, temperature

Overview

In this tutorial, we will explore how to use ORNL DAAC data from THREDDS Data Server through OPeNDAP protocol using Matlab. THREDDS is a web server that provides direct access to scientific data sets and OPeNDAP is a protocol that allows access to remote data without having to download the data. This example uses temporal subset of mean temperature in global 30-year monthly climatology dataset. The mean monthly temperature data is read and its attributes, dimensions and size are retrieved. A subset of mean temperature data in June is created and plotted.

Source Data

Spatial subsets of 30-year(1961-1990) mean monthly surface climate over global land areas, excluding Antarctica. In this example, monthly mean temperature climatology data is obtained from this ORNL DAAC's THREDDS server. Get its OPeNDAP Data URL (https://thredds.daac.ornl.gov/thredds/dodsC/ornldaac/542/climate6190_TMP.nc4) from the OPeNDAP Dataset Access Form.

Prerequisites:

Matlab R2012a or later.

Procedure

The Matlab live script can't be previewed in GitHub webpage. The tutorial below is in PDF version just for preview purpose. Access the tutorial here: Tutorial pdf

The R scripts are also accessible and downloadable. These two files are just in different format, but have the same contents. Access the Matlab scripts here: Matlab Live Script in .mlx, Matlab script in .m

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Access Distributed NASA Earth Science Data from OPeNDAP Services using Matlab

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