[webservices] StationEpoch duplicates
John D. West
john.d.west at asu.edu
Sun Nov 13 20:20:54 PST 2011
Hi, Alex.
OK, I understand why I'm getting duplicates. I do think, however, that the
service should only return distinct StationEpochs. If the service returns
this level of duplicated information, it makes me wonder whether the
level=sta format has any utility. Why even provide it?
Thanks!
-- John
On Mon, Nov 14, 2011 at 1:16 PM, Alex <alex at iris.washington.edu> wrote:
> Hi John,
>
> What happened is that you selected "station level" information using the
> -sta flag. If you didn't use that, it would default to channel level and
> you would see that WS is returning one line for each channel and omitting
> the channel name, so it looks like lots of duplicates. If you want only
> the earliest and latest station epochs, you will have to read them all to
> figure this out.
>
> Also just as an FYI since you are interested in the epochs, sometimes a
> very tiny gap in station epochs can exist (like one sample point e.g.
> 0.05sec) or metadata gets changed and what happens is that you will see 2
> epochs where the end of the first epoch will equal the start of the second.
>
> epoch 1: 2002-03-17T00:00:00,2005-04-05T06:07:08
> epoch 2: 2005-04-05T06:07:08,2599-12-31T23:59:59
>
> Alex
>
>
> channel level:
>
> scoop synthetics/METADATA> FetchMetadata -ua 2011-06-06 -N ND -vvv -s
> 2010-01-01 -e 2500-12-12
> FetchMetadata (2011.172) at 2011-11-13 18:37:39
> == Data selections ==
> ND||||2010-01-01T00:00:00|2500-12-12T00:00:00
> Metadata URI: '
> http://www.iris.edu/ws/station/query?level=chan&network=ND&timewindow=2010-01-01,2500-12-12&updatedafter=2011-06-06
> '
> Fetching metadata :: Received 108.1 KB
> Received 108.1 KB of metadata in 0.1 seconds (1.2 MB/s)
> Parsing XML metadata... Done (0.1 seconds)
> Processed metadata for 84 channel epochs in 0.2 seconds (488.3 KB/s)
> Writing metadata (84 channel epochs) file
>
> #net,sta,loc,chan,lat,lon,elev,depth,azimuth,SACdip,instrument,scale,scalefreq,scaleunits,samplerate,start,end
> ND,KOUNC,--,BHE,-20.5507,164.2861,88.0,0.0,90.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,BHN,-20.5507,164.2861,88.0,0.0,0.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,BHZ,-20.5507,164.2861,88.0,0.0,0.0,0,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,BNE,-20.5507,164.2861,88.0,0.0,90.0,90,Episensor; DC to >200
> Hz; 20V differential full
> s,2.18979E8,0.05,M/S**2,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,BNN,-20.5507,164.2861,88.0,0.0,0.0,90,Episensor; DC to >200
> Hz; 20V differential full
> s,2.18979E8,0.05,M/S**2,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,BNZ,-20.5507,164.2861,88.0,0.0,0.0,0,Episensor; DC to >200 Hz;
> 20V differential full
> s,2.18979E8,0.05,M/S**2,20,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HHE,-20.5507,164.2861,88.0,0.0,90.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HHN,-20.5507,164.2861,88.0,0.0,0.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HHZ,-20.5507,164.2861,88.0,0.0,0.0,0,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HNE,-20.5507,164.2861,88.0,0.0,90.0,90,Episensor; DC to >200
> Hz; 20V differential full
> s,2.18979E8,0.05,M/S**2,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HNN,-20.5507,164.2861,88.0,0.0,0.0,90,Episensor; DC to >200
> Hz; 20V differential full
> s,2.18979E8,0.05,M/S**2,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,--,HNZ,-20.5507,164.2861,88.0,0.0,0.0,0,Episensor; DC to >200 Hz;
> 20V differential full
> s,2.18979E8,0.05,M/S**2,100,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,--,BHE,-20.7771,167.2402,33.0,0.0,90.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,--,BHN,-20.7771,167.2402,33.0,0.0,0.0,90,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,--,BHZ,-20.7771,167.2402,33.0,0.0,0.0,0,Trillium 120P; 120 s;
> 1201 V/m/s-Kephren; gain
> 1;,1.28257E11,0.05,M/S,20,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,--,BNE,-20.7771,167.2402,33.0,0.0,90.0,90,Episensor; DC to >200
> Hz; 20V differential full
> s,2.18979E8,0.05,M/S**2,20,2010-08-28T00:00:00,2599-12-31T23:59:59
>
>
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> station level (-sta flag):
>
> scoop synthetics/METADATA> FetchMetadata -ua 2011-06-06 -N ND -vvv -s
> 2010-01-01 -e 2500-12-12 -sta
> FetchMetadata (2011.172) at 2011-11-13 18:36:27
> == Data selections ==
> ND||||2010-01-01T00:00:00|2500-12-12T00:00:00
> Metadata URI: '
> http://www.iris.edu/ws/station/query?level=sta&network=ND&timewindow=2010-01-01,2500-12-12&updatedafter=2011-06-06
> '
> Fetching metadata :: Received 38.3 KB
> Received 38.3 KB of metadata in 0.1 seconds (492.5 KB/s)
> Parsing XML metadata... Done (0.0 seconds)
> Processed metadata for 84 station epochs in 0.1 seconds (323.3 KB/s)
> Writing metadata (84 station epochs) file
> #net,sta,lat,lon,elev,site,start,end
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,KOUNC,-20.5507,164.2861,88.0,Koumac; New
> Caledonia,2011-03-17T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,-20.7771,167.2402,33.0,Lifou; Loyalty Islands; New
> Caledonia,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,-20.7771,167.2402,33.0,Lifou; Loyalty Islands; New
> Caledonia,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,-20.7771,167.2402,33.0,Lifou; Loyalty Islands; New
> Caledonia,2010-08-28T00:00:00,2599-12-31T23:59:59
> ND,LIFNC,-20.7771,167.2402,33.0,Lifou; Loyalty Islands; New
> Caledonia,2010-08-28T00:00:00,2599-12-31T23:59:59
>
>
>
> On Nov 13, 2011, at 4:05 PM, John D. West wrote:
>
> Hi.
>
> The query
> http://www.iris.edu/ws/station/query?updatedafter=2011-06-06&level=sta&net=ND&timewindow=2010-01-01,2500-12-12
> returns multiple duplicates of the <StationEpoch> sections for each
> station.
>
> Makes my sync to a local copy procedure very slow...
>
> Thanks!
>
> -- John
> _______________________________________________
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> webservices at iris.washington.edu
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>
>
>
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