Giovanni Concepts, Skills, & TechniquesIntroduction to Giovanni
Giovanni has multiple interfaces, called instances. Instances are divided into four broad categories based on the type of Earth science data they display:Selecting a dataset with Giovanni
- Atmospheric Instances: aerosol optical thickness, clouds, water vapor, ozone, trace gas profiles, reflectivity data
- Environmental Instances: air quality, precipitation, multi-satellite atmospheric & land parameter data
- Ocean Instances: ocean color, NASA Ocean Biogeochemical Model (NOBM) assimilated products (chlorophyll and phytoplankton functional groups) data
- Hydrology Instances: rainfall, aerosols, clouds, water vapor, historical analyses of the hydrological cycle, land surface state data
- Giovanni Interface - General
- Select an Area of Interest
- Select Visualization Type
- Set Parameters
A parameter is one of the variables that define a specific instance of a map projection. The parameters tab in Giovanni allows users to select the data source and type of data to be displayed on the map. From within the Giovanni interface, users can access the details of the particular dataset selected by clicking on the title of the data set.
- Set Temporal (Time) Boundaries
Temporal, or time, boundaries can be set within the Giovanni interface. To set a temporal boundary users select a starting and ending date.
- Visualization Output
Visualization is the representation of data in a viewable (graphic) medium or format. It is used to organize spatial data and related information. 15 types of visualizations are available with Giovanni. The most common forms used are Lat-lon time averaged maps and Time series plots. More complex forms include: Animations, Comparison, and Hovmöller Plots.
- Zooming and Panning
Using Giovanni to Access Data
- Access Chlorophyll-a data with Giovanni (MODIS data)
- Animate Chlorophyll Concentrations Over One Year
- Create a KML File Using Giovanni and Import it into Google Earth
- Export Giovanni Images to use with ImageJ
- Set up and Download a Giovanni Visualization
Giovanni data is available in several output formats for use in other applications. Two common forms of output are "GIF"Graphics Interchange Format, which is suitable for animations, and "KMZ"Keyhole Markup Language - zipped, which is viewable in Google Earth.
- Use Giovanni to Explore Precipitation (TRMM data)