-----Original Message-----
From: thredds-bounces@xxxxxxxxxxxxxxxx [mailto:thredds-
bounces@xxxxxxxxxxxxxxxx] On Behalf Of John Caron
Sent: Monday, July 23, 2012 5:50 PM
To: Roy Mendelssohn
Cc: thredds@xxxxxxxxxxxxxxxx
Subject: Re: [thredds] Scan Aggregation vs. Feature Collection
Well, its complicated.
Old style aggregations, aka "NcML aggegations" remain supported. I think of
these as low level index manipulations. These are embedded in NcML, either
on the client or in TDS config catalog, see:
http://www.unidata.ucar.edu/projects/THREDDS/tech/tds4.3/tutorial/NcML.ht
m
We can do much better when we know the "feature type", and the new way is
called "feature collections":
1) type=FMRC is for gridded data. Works mostly of in 4.2, but refactored in 4.2
and still testing.
2) type=GRIB is for GRIB data, which is a special kind of gridded data.
This supersedes FMRC when the data is in GRIB. Only in 4.3, ready for beta
test.
3) type=point are for point feature types. Still in alpha in 4.3
NcML works fins when you know what you are doing and you have
homogenous files. feature collections are intededd to be easier to use and
tolerate heterogeneous files.
John
On 7/23/2012 3:27 PM, Roy Mendelssohn wrote:
But is this just for FMRC aggregation, or for all aggregations? I could swear I
remember a web age with feature collections that "grid" was a feature type,
but when I looked the other day, it was point, station and grib I believe.
Maybe it was my old age and bad vision seeing "grid" for "grib". If there is an
aggregation for featureType=grid, can you point me to the page that describes
this.
We do not have any FMRC aggregations, but if there all of our aggregations
should be feature collections, then I have a lot of editing to do on our xml
files.
Thanks,
-Roy
On Jul 23, 2012, at 1:59 PM, John Caron wrote:
On 7/19/2012 11:50 AM, Roy Mendelssohn wrote:
Hi All:
I have asked this before and am not certain that I ever got a response.
For TDS 3.0 is it correct to assume that scan aggregation is deprecated and we
should be using feature collections for aggregation instead?
Hi Roy:
Yes correct, though we are still debugging the FMRCs in 4.3.
For GRIB files, you really want to use feature collections , type = GRIB.
4.3.12 is the last alpha, next release will be beta. It should be ready this
week.
Would appreciate use and feedback.
John
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"The contents of this message do not reflect any position of the U.S.
Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst NOAA/NMFS Environmental
Research Division Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
"the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
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