I've been tasked with visualizing a few types of metoc data onto Worldwind based on .grib files. I'm VERY new to the GIS world and I'm just beginning to figure out how a lot of these pieces go together (so expect more questions from me!)
I just learned how to use an SLD to generate windbarbs in Geoserver. The windbarbs themselves look correct and get plotted in Worldwind correctly (in the right location) when I download a geotiff off Geoserver. However question #1 is how do I generate an image file that I can import into WorldWind with a transparent background? I think i read that tiffs don't support transparency, so should I use a different format? Which one? and how do I configure my layer in geoserver or edit my SLD to produce a transparent background?
I tried downloading jpeg, png, etc.. from Geoserver but the only format that produces an image is any tiff format.
Here's a link to my SLD file: http://pastebin.com/km05xVAR
Here's the variable info from the grib2 file I'm using (v-component obviously identical):
float u-component_of_wind_surface(time=61, lat=29, lon=29); :long_name = "u-component of wind @ Ground or water surface"; :units = "m/s"; :abbreviation = "UGRD"; :missing_value = NaNf; // float :grid_mapping = "LatLon_Projection"; :coordinates = "reftime time lat lon"; :Grib_Variable_Id = "VAR_0-2-2_L1"; :Grib2_Parameter = 0, 2, 2; // int :Grib2_Parameter_Discipline = "Meteorological products"; :Grib2_Parameter_Category = "Momentum"; :Grib2_Parameter_Name = "u-component of wind"; :Grib2_Level_Type = "Ground or water surface"; :Grib2_Generating_Process_Type = "Forecast";
If you're curious, here's the entire data dump of u/v data: http://pastebin.com/sJf61EYk
Here's what I have in Worldwind right now: