[ferret_users] RE: Error in plotting time series data with 6.1?

["McCann, Mike" <mccann@xxxxxxxxx>]

Hi again,

 

I generated another netCDF file with fewer points (10-minute interval sampling from the original data) and Ferret properly recognizes the time axis as irregular:

> ferret
        NOAA/PMEL TMAP
        FERRET v6.1
        Linux(g77) 2.4.21-32 - 03/25/08
        26-Aug-08 13:11

yes? use "http://dods.mbari.org/cgi-bin/nph-nc/data/ssdsdata/deployments/mse2006/200609/mse2006_ctd_20061106_original.nc"
yes? show grid GAF1
    GRID GAF1
 name       axis              # pts   start                end
 LONGITUDE LONGITUDE            1mr   122.89W(-122.89)     122.89W(-122.89)
 LATITUDE  LATITUDE             1 r   36.237N              36.237N
 NOMINALDEPTH DEPTH (m)         1 r-  3450                 3450
 ESECS     TIME             14760 i   06-NOV-2006 01:00    27-APR-2007 23:50

Ferret thinks that the 2-minute interval data is regular:

yes? use "http://dods.mbari.org/cgi-bin/nph-nc/data/ssdsdata/deployments/mse2006/200609/mse2006_ctd_20061106_original_120.nc"
yes? show grid GMH1
    GRID GMH1
 name       axis              # pts   start                end
 LONGITUDE LONGITUDE            1mr   122.89W(-122.89)     122.89W(-122.89)
 LATITUDE  LATITUDE             1 r   36.237N              36.237N
 NOMINALDEPTH DEPTH (m)         1 r-  3450                 3450
 ESECS1    TIME             68919 r   06-NOV-2006 01:00    27-APR-2007 23:48

Seems like Ferret is making a decision to make the time axis regular even though it's not.  Should I provide some help by adding an attribute of 'point_spacing: "uneven"' to the time axis definition in the netCDF file?

 

-Mike

 

---

From: McCann, Mike
Sent: Tuesday, August 26, 2008 10:32 AM
To: ferret_users@xxxxxxxx
Subject: Error in plotting time series data with 6.1?

Hello,

 

We just upgraded to Ferret 6.1 on a Linux host and I'm getting strange results in plotting an irregular time series. 

 

Here's the plot with an older version running on my Windows box (plots correctly):

bash-2.05$ ferret
        NOAA/PMEL TMAP
        FERRET v5.51
        cygwin 1.3.x - 02/28/03
        26-Aug-08 10:06

yes? use "http://dods.mbari.org/cgi-bin/nph-nc/data/ssdsdata/deployments/mse2006/200609/mse2006_ctd_20061106_original_120.nc"
yes? plot PRESSURE

 

Here's the plot with the current release running on my RH Linux (seems to treat the time series as regular) :

> ferret
        NOAA/PMEL TMAP
        FERRET v6.1
        Linux(g77) 2.4.21-32 - 03/25/08
        26-Aug-08 10:07

yes? use "http://dods.mbari.org/cgi-bin/nph-nc/data/ssdsdata/deployments/mse2006/200609/mse2006_ctd_20061106_original_120.nc"
yes? plot PRESSURE

 

Any help or suggestions are appreciated.

 

-Mike

 

--
Mike McCann
Software Engineer
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, CA 95039-9644
Voice: 831.775.1769  Fax: 831.775.1736 http://www.mbari.org