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Re: [ferret_users] reversing of z axis



Hi,

It looks as though the axis needs to be marked as a "depth" axis. In the file, the coordinate variable needs an attribute

   ST_OCEAN :positive = "down" ;

You can correct how Ferret sees the axis within the Ferret session,

yes? use my_data
yes? set axis/depth `var,return=zaxis`

Then the "show grid" would have a minus sign showing the direction of the axis


    GRID GBT1
 name       axis           # pts      start                   end              subset
 XT_OCEAN  LONGITUDE       720mr     0.25E                    0.25W            full
 YT_OCEAN  LATITUDE        330 r     74.75S                   89.75N           full
 ST_OCEAN  Z (meters)       50 i-     5.0335                5395               full
 TIME      TIME              1 r      17-MAR-2004 13:00    17-MAR-2004 13:00   full



On 3/13/2019 10:55 AM, saurabh rathore wrote:
Dear Ferreters,
I am facing a problem for z axis for 50 vertical levels from soda ocean temperature data . when I list the z axis it look good to me as...

let p=z[gz=var]
list p
5      /  1:     5.
 15.1   /  2:    15.
 25.2   /  3:    25.
 35.4   /  4:    35.
 45.6   /  5:    46.
 55.9   /  6:    56.
 66.3   /  7:    66.
 76.8   /  8:    77.
 87.6   /  9:    88.
 98.6   / 10:    99.
 110.1  / 11:   110.
 122.1  / 12:   122.
 134.9  / 13:   135.
 148.7  / 14:   149.
 164.1  / 15:   164.
 181.3  / 16:   181.
 201.3  / 17:   201.
 224.8  / 18:   225.
 253.1  / 19:   253.
 287.6  / 20:   288.
 330    / 21:   330.
 382.4  / 22:   382.
 446.7  / 23:   447.
 525    / 24:   525.
 618.7  / 25:   619.
 728.7  / 26:   729.
 855    / 27:   855.
 996.7  / 28:   997.
 1152.4 / 29:  1152.
 1320   / 30:  1320.
 1497.6 / 31:  1498.
 1683.1 / 32:  1683.
 1874.8 / 33:  1875.
 2071.3 / 34:  2071.
 2271.3 / 35:  2271.
 2474   / 36:  2474.
 2678.8 / 37:  2679.
 2884.9 / 38:  2885.
 3092.1 / 39:  3092.
 3300.1 / 40:  3300.
 3508.6 / 41:  3509.
 3717.6 / 42:  3718.
 3926.8 / 43:  3927.
 4136.3 / 44:  4136.
 4345.9 / 45:  4346.
 4555.6 / 46:  4556.
 4765.4 / 47:  4765.
 4975.2 / 48:  4975.
 5185.1 / 49:  5185.
 5395   / 50:  5395.

but the interesting thing is when I plot this data it is showing me a reverse plot... which is attached in this email.

sh gr temp
    GRID GBT1
 name       axis                        # pts      start                      end                        subset
 XT_OCEAN  LONGITUDE       720mr   0.25E                    0.25W                         full
 YT_OCEAN  LATITUDE          330 r     74.75S                   89.75N                       full
 ST_OCEAN  Z (meters)          50 i       5.0335                       5395                       full
 TIME      TIME                        1 r      17-MAR-2004 13:00    17-MAR-2004 13:00   full

so I am just confused that in data how this axis is defined I tried using /order=xy-zt but that was not working.

I hope to get some help

cheers, saurabh

--


REGARDS

Saurabh Rathore
Research Scholar (PhD.)
Centre For Oceans, Rivers, Atmosphere & Land Science Technology
Indian Institute Of Technology, Kharagpur
contact :- 91- 8345984434

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