Hi again John.
On Wednesday 21 December 2005 19:15, you(John Caron) wrote:
Bjørge Solli wrote:
John Caron wrote:
Unidata Support wrote:
------- Forwarded Message
To: address@hidden
From: =?ISO-8859-1?Q?Bj=F8rge_Solli?= <address@hidden>
Subject: NcML Aggregation in THREDDS
Organization: Nansen Environmental and Remote Sensing Center - Bergen
Keywords: 200512201217.jBKCH47s009594 THREDDS NcML aggregation
Hi,
I am currently rewriting our xml-files to use the new aggregation
functionality in Thredds 3.4. I have looked over all the
documentation I could find on thredds and NcML but still have one
unansvered Q. Hope you can help:
In the old version we used AggServer with an xml-statement like this:
...
<aggregation serviceName=".." aggType=".." varType=".." varUnit".."
dateFormat="yyyy/M/d:hh:mm:ss z">
<fileAccess urlPath="long_name_b20030604_f200305289999.nc"
coord="2003/05/28:00:00:00 GMT" />
...
...
My remaining Q is where I should write dateFormat now. I have
something like this:
...
<variable name="time" type="int" shape="time">
<attribute name="units" value=".." />
<attribute name="_CoordinateAxisType" value="Time" />
</variable>
Here you are defining a time coordinate of dataType "int"
I see I omitted the units-value, it is "secs since 1970-01-01 00:00:00".
This is a value I don't think my research coworkers want to change since
I understand it is some standard in their field. The one in charge are
on holidays, so will have to wait till he's back for the definite
answer.
yes thats a udunit string, which thredds also uses.
but if you use this, then you must write the correct integer values in
the coord field.
<aggregation dimName="time" type="joinNew">
<variableAgg name="T" />
netcdf location="long_name_b20030604_f200305289999.nc"
coord=""2003/05/28:00:00:00 GMT" />
But you are giving it String values.
I guess I could give it int-values, but that would remove readability.
true, so the ISO 8601 date strings would work better.
I tried with strings, but failed, and now I try with int, like this:
I have enclosed a full xml-file, but here is how it looks now:
...
<dataset name="MERSEA CLASS 1 Aggregated files">
<service name="this" serviceType="OpenDAP" base="" />
<service name="TOPAZ" serviceType="OpenDAP" base="/thredds/dodsC/">
<datasetRoot path="topaz"
dirLocation="http://nerscweb.bccs.uib.no/nersc/nph-dods/mersea-ip/nat/mer
sea-class1/" /> </service>
<metadata inherited="true">
<serviceName>this</serviceName>
<dataType>Grid</dataType>
</metadata>
<dataset name="Best estimate - Atlantic"
ID="mersea-ip-topaz-class1-nat-be"
urlPath="topaz/mersea-ip-topaz-class1-nat-be">
<serviceName>TOPAZ</serviceName>
<netcdf
xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<dimension name="time" length="0" />
<variable name="time" type="int" shape="time">
<attribute name="units" value="secs since 1970-01-01 00:00:00" />
<attribute name="_CoordinateAxisType" value="time" />
</variable>
<aggregation dimName="time" type="JoinNew">
<netcdf
location="http://nerscweb.bccs.uib.no/nersc/nph-dods/mersea-ip/nat/mersea
-class1//topaz_V2_mersea_nat_grid1to8_da_class1_b20050706_f200506299999.nc
" coord="1120003200" />
...