Re: [thredds] cannot figure out why WCS won't work with this FMRC

  • To: Jonathan Wilkins <wilkins@xxxxxxxxxx>
  • Subject: Re: [thredds] cannot figure out why WCS won't work with this FMRC
  • From: John Maurer <jmaurer@xxxxxxxxxx>
  • Date: Thu, 19 Apr 2012 14:54:43 -1000
Thanks again, Jonathan! That fixed things up nicely: WCS works now.
Cheers,
John Maurer

P.S. For Unidata: The TDS WCS documentation (
http://www.unidata.ucar.edu/projects/THREDDS/tech/reference/WCS.html)
states that the Z axis must also be regularly spaced. This doesn't seem to
be true since our depths are not regularly spaced: -5500, -5000, -4500,
-4000, -3500, -3000, -2500, -2000, -1750, -1500, -1400, -1300, -1200,
-1100, -1000, -900, -800, -700, -600, -500, -400, -300, -250, -200, -150,
-125, -100, -75, -50, -30, -20, -10, -5. Might need to update the
documentation on that page. Thanks.

On Thu, Apr 19, 2012 at 7:42 AM, John Maurer <jmaurer@xxxxxxxxxx> wrote:

> Thanks, Jonathan! We had intended to produce a regular grid but I see now
> on close inspection that latitude spacing varies between ~0.0368 and 0.0352
> deg. We'll even these out and report back...
> Cheers,
> John Maurer
> PacIOOS
>
>
> On Thu, Apr 19, 2012 at 7:24 AM, John Caron <caron@xxxxxxxxxxxxxxxx>wrote:
>
>>  Yes, of course. The lat coordinate is irregular.
>>
>> its lame that WCS only allows regular spacing. I think thats fixed in WCS
>> 2.1 (?)
>>
>> thanks for seeing that, Jonathan!
>>
>>
>> On 4/19/2012 9:27 AM, Jonathan Wilkins wrote:
>>
>> Hi,
>>
>> I think the problem is that latitude values are not regularly spaced as
>> specified
>> by http://www.unidata.ucar.edu/projects/THREDDS/tech/reference/WCS.html
>>
>> I faced the same problem and after regridding my dataset, it was
>> available through WCS.
>>
>> Regards
>>
>> Jonathan Wilkins
>>
>>
>> Le 11/04/2012 17:07, John Caron a écrit :
>>
>> Hi John:
>>
>> Nothing obviously wrong here.
>>
>> Can you look and see if theres any messages in the logs. Probably it
>> would be in models.log and/or featureCollectionScan.log. You can just send
>> me the whole thing if you want.
>>
>> John
>>
>> On 4/11/2012 5:26 AM, John Maurer wrote:
>>
>> P.S. To make sure, I checked that my files are CF compliant at
>> http://puma.nerc.ac.uk/cgi-bin/cf-checker.pl and all looks good. After
>> trying several more things, I still cannot see what is wrong. Seems strange
>> that all other services besides WCS would work (including WMS, NCSS,
>> OPeNDAP, ISO, NcML). Perhaps a bug in the FMRC-to-WCS side of things?
>> Though I don't see what's tripping it up since I have other FMRC's whose
>> WCS works fine. Note that some variables are 3-D (surface elevation) while
>> others are 4-D (temperature, salinity, u/v velocities). Anyways, hoping
>> somebody can eventually give this a look. I realize Unidata's swamped with
>> 4.3 right now, so maybe after that sometime...
>> Thanks!,
>> John Maurer
>>
>> On Thu, Apr 5, 2012 at 12:04 AM, John Maurer <jmaurer@xxxxxxxxxx> wrote:
>>
>>> Hi everyone,
>>> I'm stumped: any ideas why the following regular gridded FMRC dataset
>>> produces an empty WCS capabilities document (no variables/coverages get
>>> listed; ContentMetadata section is entirely missing)?:
>>>
>>>
>>> http://oos.soest.hawaii.edu/thredds/catalog/hioos/roms_forec_regridded/hiig/catalog.html
>>>
>>> In particular, I'm looking at the Best Time Series at:
>>>
>>>
>>> http://oos.soest.hawaii.edu/thredds/catalog/hioos/roms_forec_regridded/hiig/catalog.html?dataset=roms_hiig_forecast_regridded/ROMS_Hawaii_Regional_Ocean_Model_Regridded_best.ncd
>>>
>>> Whose WCS URL is this:
>>>
>>>
>>> http://oos.soest.hawaii.edu/thredds/wcs/hioos/roms_forec_regridded/hiig/ROMS_Hawaii_Regional_Ocean_Model_Regridded_best.ncd?service=WCS&version=1.0.0&request=GetCapabilities
>>>
>>> The other services all work fine, including OPeNDAP, NCSS, WMS, ISO, and
>>> NcML.
>>>
>>> Although the original ROMS ocean forecast model was on a curvilinear
>>> grid (which WCS cannot handle), we've regridded onto a regular grid. One
>>> positive outcome of this was that I should be able to turn on WCS for it
>>> now (so that people can download GeoTIFFs); however, I'm not having any
>>> luck yet. The logs are not showing anything useful. threddsServlet.log just
>>> shows this:
>>>
>>> 2012-04-04T23:19:53.210 -1000 [    847655][     643] INFO  -
>>> thredds.server.wcs.WCSServlet - Remote host: 128.171.151.240 - Request:
>>> "GET
>>> /thredds/wcs/hioos/roms_forec_regridded/hiig/ROMS_Hawaii_Regional_Ocean_Model_Regridded_best.ncd?service=WCS&version=1.0.0&request=GetCapabilities
>>> HTTP/1.1"
>>> 2012-04-04T23:19:53.214 -1000 [    847659][     643] INFO  -
>>> thredds.server.wcs.v1_0_0_1.WcsHandler - Request Completed - 200 - -1 - 4
>>>
>>> I have other regular gridded FMRC's whose WCS works fine; one example
>>> (NCOM):
>>>
>>>
>>> http://oos.soest.hawaii.edu/thredds/catalog/pacioos/ncom/hawaii/catalog.html
>>>
>>> http://oos.soest.hawaii.edu/thredds/catalog/pacioos/ncom/hawaii/catalog.html?dataset=ncom_hawaii/NCOM_Hawaii_Regional_Ocean_Model_best.ncd
>>>
>>> http://oos.soest.hawaii.edu/thredds/wcs/pacioos/ncom/hawaii/NCOM_Hawaii_Regional_Ocean_Model_best.ncd?service=WCS&version=1.0.0&request=GetCapabilities
>>>
>>> In case it helps, I've placed my catalog file and one of the data files
>>> (174 MB) on anonymous FTP:
>>>
>>> ftp ftp.soest.hawaii.edu
>>> cd jmaurer
>>> get ocn_mod_hiig.xml
>>> get hiig_forec_gridded_20120402.nc
>>>
>>> Thanks for your help on this!,
>>> John Maurer
>>> Pacific Islands Ocean Observing System (PacIOOS)
>>> University of Hawaii at Manoa
>>>
>>
>>
>>
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