The NASA-developed Earth Observing System (EOS) Clearinghouse (ECHO) is a spatial and temporal metadata registry and order broker built by NASA's Earth Science Data and Information System (ESDIS) that enables the science community to more easily use and exchange NASA's data and services.

ECHO includes metadata for more than 2500 datasets and over 100,000,000 granules in the ECHO Metadata Model. Understanding the relationships and crosswalks between the ECHO Model and the ISO Standards is an important step towards building bridges between them. This category includes pages that explore those relationships.