Hi Martha- > Full Name: Martha > Email Address: address@hidden > Organization: Oregon State U. > Package Version: 2.7u1 build date:2009-07-14 19:24 UTC > Operating System: Windows XP > Hardware: Java: home: C:\Program Files\IDV_2.7u1\jre version: 1.6.0_13 > j3d:1.5.2 fcs (build4) > Description of problem: Hi Don, > > Crossing the 0 longitude (the area I'm working on is Lat -30 to -60; Lon 330 > - 30 (or -30 to 30). > > I've sent you a bundle but contend it would be better for you to just grab > the data yourself because it will show you how it's impossible to use the > region option to try things and how the bounding box shifts around. > > If you access: Catalogue - NOAA Oceanographic Data - Coast Watch (2nd one) - > Satellite DataSets - Color - Chlorophyll-a, OrbView-2 SeaWIFs,Global - monthly > you will find the gridded data I've been trying to cross the 0 longitude. > Just grabbing one time 8/16/2002 show enough. > > I can only use the properties to set the area and have found that: > Request longitude 330 - 30 will only provide 0-30 > 330 - 0 gives you 0 - 330 > 330 - 360 gives you 0 - 330 > -30 - 0 gives you 0 - 330 > > However, 330-359 works and requesting 0-30 filles in on the other side with > no data in the center. The problem is that the data in the original dataset goes from 0-360 and the underlying netCDF-Java library does not allow subsetting across the grid bounds. Thus, we can't make a request to satisfy what you want in the IDV. However, it looks like the Live Access Server knows how to stitch together a cross seam request and can output a netCDF file that the IDV can read. I got a file from: http://las.pfeg.noaa.gov/oceanWatch/oceanwatch.php and made the request to be -30 to 30. Unfortunately, I haven't had similar success trying to download a lat-lon region vs. time. That doesn't seem to subset correctly. > I have had other various problems trying to cross the 0 and 180 and will send > you examples of those as they occur. If you have some that use to work, but don't now, that would be helpful. I made a change the might fix those, but don't have a test case yet. > Thanks so much for your attention to this issue. I'll be working with the > "spliced" sets for analysis but would love to have the capability of a > contiguous set for animations. Until we have support in the underlying netCDF layer, I don't see this happening in the IDV side. I'll talk to the developer again. Don Ticket Details =================== Ticket ID: VGT-219571 Department: Support IDV Priority: Normal Status: Open
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