Greetings all, I'm curious if anyone out there can help me with some questions I have about GeoGrids. Specifically I'm wondering if anyone knows how I can go about the process of combining multiple GeoGrids into one "object" and then write that object to a local .nc file. Thus far, I've succeeded in connecting to an opendap server, getting a single geogrid, subsampling it and using the GeoGrid.writeFile() method to create a local file. I've noticed that the javadoc for GeoGrid says not to use the writeFile method - but I couldn't see another way of getting the data to disk. So my first question is - what is the correct method for writing the contents of a GeoGrid to a local file?? I've checked out NetcdfFileWriteable, but that doesn't allow me to add a GeoGrid (at least not directly). My second question is - is there a way to combine multiple geogrids so that their contents can be written to a single file. For example - if my opendap dataset has U, V, and Temp variables, I'd like them all to be written to a single file. My geogrid.writeFile method produces a dataset for each at this point... In relation to this second question - how would I combine geogrids from 2 separate opendap sources - assuming that they are identical aside from the variable(s) of interest? Thank you in advance for your help - it's most appreciated. Chris Christopher Mueller | Scientist Applied Science Associates 70 Dean Knauss Drive | Narragansett, RI 02882 USA p: +1 401-789-6224 | f: +1 401-789-1932 e: cmueller@xxxxxxxxxxxxxx <mailto:ehowlett@xxxxxxxxxxxxxx> | www.asascience.com <http://www.asascience.com/> ASA | Science. Services. Solutions.