Re: [ferret_users] Spatial Trend

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hello,
Your data is organized as lists of longitude, latitude, time and measurements. You used a good method, plot/vs/ribbon, to visualize the density and range of the data.

yes? go basemap x=15:120 y=-60:30
yes? plot/vs/over/nolab/ribbon/thick/size=0.08/symbol=17/key/LEV= v LON,LAT,SWHCOR

To interpolate it to a grid, use one of the SCAT2GRID functions

   yes? show function scat2grid*xy

Perhaps the scat2gridgauss_xy function. A note on the syntax: in your axis definition, the latitude axis should be one of these:

DEFINE AXIS/Y=60S:30N:10/UNIT=DEGREES ylat
DEFINE AXIS/Y=-60:30:10/UNIT=DEGREES ylat

Not -60S. 

-Ansley

On 2/3/2014 7:49 PM, Selvam G. wrote:

Dear Prof,

I would like to know the ferret command for linear Interpolation. I am dealing with Ifremer altimeter wave data for Indian Ocean.I plotted the map but when the Interpolation command is given the .des file is not shown as it is Interpolated. I am attaching one of my wave data for your consideration. I request your guidance for this Interpolation. 

Thanks & regards
Selvam G.

----- Original Message -----
From: "Russ Fiedler" <russell.fiedler@xxxxxxxx>
To: "ferret users" <ferret_users@xxxxxxxx>
Sent: Tuesday, February 4, 2014 3:16:38 AM
Subject: Re: [ferret_users] Spatial Trend


The time units for the trend should correspond to the time axis for your 
data. If it's days then you will have to multiply by 365 or 365.25 to 
get the trend in terms of years.

Russ

On 03/02/14 23:45, iwlod@xxxxxxxxxxxxxxxxxxx wrote:

I dont think it is that simple - units on slope are way to small

can someone else confirm?
thanks

Simply shade slope.

Sent from my iPhone

On Jan 31, 2014, at 4:17 AM, iwlod@xxxxxxxxxxxxxxxxxxx wrote:


Collective Ferret Wisdom :-)

How do I go from a linear regression line plot (with go regresst) to a
SPATIAL (lat x lon) trend map of say, temperature  for the past 20
years?

Thank you