SeaWiFS
SeaWiFS
From the same OceanColor website as the MODIS data (gsfc.nasa.gov) you can download SeaWiFS data, a particularly good source for chlorophyll-a at sea and NDVI on land.
- the SeaWiFS Standard Mapped Products are already geocoded in WGS84 so should be easy to load into a lat/lon location with r.in.gdal (at least this is true for PAR maps).