Hi Ronak,
Patel, Ronak Avinash (US SSA) wrote:
Hello,
I guess my main problem is that I don’t understand the lingo that’s being used here.
1. What is a “feature” in the DataStore sense? Is this the same thing
as what WFS considers to be a “feature”?
More or less. The term "feature" definitely comes form WFS. When in teh context of data store a feature means an entry in a dataset which has some attributes.
2. How do I return coverages through this DataStore interface? What
format are the coverages supposed to be in?
Coverages are not managed via the DataStore interface. Look at the AbstractGridFormat and AbstractGridCoverage2DReader classes in the org.geotools.coverage.grid.io package for the data access classes relevant to coverages.
3. Are there any typeNames that I must return? Or can typenames be
any random string I want? What is a TypeName used for? Does this
get shown to the enduser of Geoserver?
Yes type names is the list of "types" you want to publish through the datastore, and should not be random. Type name is used by the outside world to identify "datasets" served by the datastore. For instance when the datastore is db based, type names correspond to table names.
4. How do I return images through this interface? Is there any
specific format those images have to be in? PlanarImage?
RenderableImage? Or a simple byte?
The StreamingRenderer class (org.geotools.renderer.lite) can render data from a DataStore into a Graphics2D context... which can originate from a RenderedImage.
Thanks for your continued support!
Hope that helps 
Ronak
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Enterprise support for open source geospatial.