Re: x2sys tools: time gap does not work

Dear professor Paul，

Today I reviewed  my question and  found that I confused the Time Tag.
In GMT x2sys tools what the -Wt sets is the  maximum time gap between the
two data points immediately on either side of a crossover.
Unfortunately , I thought it was the time lag between the two pass at the
crossover point. So it did not work.
Stupid me ..

But it will be useful if GMT x2sys tools have such function.
For example, when calculate sea surface height SSH crossover difference of
satellite altimetry data, the maximum time lag of two passes should not be
very long, e.g 10days.

thanks very much

Yang Lei



2013/11/14 Paul Wessel <[email protected]>

> Hi Yan Lei-
>
> WOuld you be able to put together a very small subset (say two track
> segments) that shows the problem so that I may debug the code. If you are
> right then you would just need to send me two small files with data for two
> tracks that intersect but has times such that they should be skipped via -W.
>
> -p
>
> On Nov 12, 2013, at 5:50 PM, 杨磊 <[email protected]> wrote:
>
> hello GMT,
>
> First  thanks Paul for giving the excellent x2sys tools.
> The problem I meet is the time gap unworkable.
> I set the  maximum time gap to 864000 seconds (10 days) by
>  x2sys_init CROSSHY2 -Dxys -Exys  -Cg  -Gd -Ndk -Wd8 -Wt864000 -F
>
> But the output is the same with the one without setting a time gap.
> It still contains times longer than 10 days, such as
> '2013-08-31T03:03:35 2013-08-07T17:22:53' which are t_1 and t_2 fields in
> out file.
>
> That means that the -Wt864000 dose not work. right ?
>
> In addition, there is a little bug of x2sys_cross when out put the headers
> to outfile, which is the  'Command' line is wrote twice.
> Here is headers in my out put:
> # Command : x2sys_cross -TCROSSHY2 srl_sla.xys -Qi -W10 -Ia -Rd -V2
> # Tag: CROSSHY2
> *# Command: x2sys_cross -TCROSSHY2 srl.xys -Qi -W10 -Ia -Rd -V2 *
> # lon lat t_1 t_2 dist_1 dist_2 head_1 head_2 vel_1 vel_2 ssh_X ssh_M
> sla_X sla_M
>
> thanks very much
>
> Yang Lei
>
>
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