Sea-Viewing Wide Field-of-view Sensor (SeaWiFS)
gsn_csm_contour_map_ce is the plot interface that creates a cylindrical equidistant plot.
There is no coordinate information on the file, it has to be created. See the script for the specifics.
gsn_csm_contour_map is the plot interface that allows the user to select which type of projection they want. You can see more ways to modify satellite projections on the satellite projection example page
In addition to plotting the original 9KM data, the area_hi2lores is used to interpolate the data to a 0.5x0.5 grid. A netCDF file is created.
Other 'L3' datasets could be directly used in the sample script. For example: Example 4 on the HDF/HDF-EOS Application page.