Fig. 3 shows the graphical user interface for data discovery.
Its design uses the four sets of queryable properties. “Catalog”
allows user to choose which affiliated catalogue will be
searched. “Spatial” enables the user to express spatial constraints
on data discovery. Google Map is integrated to give
user a convenient way to find the desired location. The user can
also select states, counties, and cities within the United States
or input country name or code to specify the spatial bounding
box of area of interest. “Temporal” allows the user to query
time series data in which “ProductTime” specifies the date
and time of data generation and “CollectionRange” specifies
the date and time when the temporal coverage covers. And
“Others” allows the user to discover geospatial data through
data physical attributes described in class “dataGranule”