Ocean Modeling Discussion

ROMS/TOMS

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PostPosted: Fri Oct 29, 2010 2:18 am 
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Joined: Tue Sep 29, 2009 3:50 pm
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Location: School of Environment System Engineering,UWA
Number of State Observations Processed: ObsTime = 40124.0000

Variable IstrObs IendObs Count Rejected

temp 1 33 33 32

Total 33 32
Obs Tally 33 32

Wrote NLM state at observation locations, datum = 0000001 - 0000033


Almost all of my data were rejected.Does anyone have the similar problems?


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PostPosted: Sat Oct 30, 2010 12:45 am 
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Joined: Thu Jan 14, 2010 7:28 pm
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Location: University of Hawaii Manoa
Have you checked to make sure that your obs file variables are all in the correct format? The model is very particular in how it reads in the data.


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PostPosted: Mon Nov 01, 2010 3:35 pm 
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Joined: Wed Feb 26, 2003 4:41 pm
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Location: IMCS, Rutgers University
The 4D-Var algorithms reject data if the input observations locations are not in inside the application grid or inside the assimilation time window. Notice the the spatial locations (obs_Xgrid, obs_Ygrid, obs_Zgrid) are in in grid fractional coordinates (0:L, 0:M, 1:N) and the time coordinate (survey_time, obs_time) is in days with the same calendar as the model time and forcing (for example, days since 1968-05-23 00:00:00 GMT).

Users need to check the observations before assimilating. There is not quality control on the observations inside ROMS. This needs to be done during pre-processing.


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PostPosted: Thu Oct 24, 2013 1:22 pm 
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Joined: Fri Dec 28, 2012 5:44 am
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Location: National Marine Environmental Forecasting Center
hi,
i come with the same question. Gauge data is assimilated to the model and i check every point to make sure
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the spatial locations (obs_Xgrid, obs_Ygrid, obs_Zgrid) are in in grid fractional coordinates (0:L, 0:M, 1:N) and the time coordinate (survey_time, obs_time) is in days with the same calendar as the model time and forcing
. The cycle runs 1 day and data per hour has prepared for the poried. Only one time level data is accepted。
Anyone know why?


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PostPosted: Thu Oct 24, 2013 1:31 pm 
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Joined: Fri Dec 28, 2012 5:44 am
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Location: National Marine Environmental Forecasting Center
And also,
i prepare 24 gauge data along the coast, and restore it in form of grid.Then 'd_ssh_obs.m' is changed to process the grid data. The result is, only 7 diffetent gauge data writes to the obs.nc.Why?


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