[gradsusr] convert world coordinate distance to real distance (km)

[wendi harjupa]

Dear Mr Jeff

Thank you very much for your help.

I have two different types of data set and I need to make composite data
with those data.
One data is mismatch, then I need to know how far the mismatch.

One of my data set is binary and another one is netCDF.
I can change my control file in my binary data. But, I cannot do this for
my netCDF data.
Would you mind to suggest me, how to change XDEF and YDEF in netCDF data?

Thank you very much

best regards,
wendi

On Wed, Nov 2, 2016 at 12:02 AM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> Wendi,
> It sounds like you want to draw a plot with geographic coordinates
> replaced by straight-line/distance coordinates instead. If that is the
> case, one thing you can try is removing the PDEF line from your control
> file and resetting your XDEF and YDEF lines to start at 0 (but keep the
> delta value). That might work. If that doesn't work, you could also try
> turning off the map projection in grads (set mproj off) and then using 'set
> xaxis' and 'set yaxis' in clever ways to make it look like the map you draw
> is in terms of linear distance. Good luck.
>
> Jeff Duda
>
> On Tue, Nov 1, 2016 at 9:32 AM, HARVEY, PHILIP O NH-03 USAF AFMC 412
> OSS/OSW <philip.harvey.1 at us.af.mil> wrote:
>
>> See Ed Williams' Aviation Formulary at http://williams.best.vwh.net/a
>> vform.htm for great circle distance, etc formulas.  The formula you
>> desire is only requires 1 line and can easily be written into a function.
>>
>> Phil
>>
>>
>> -----Original Message-----
>> From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org]
>> On Behalf Of wendi harjupa
>> Sent: Tuesday, November 01, 2016 2:01 AM
>> To: GrADS Users Forum <gradsusr at gradsusr.org>
>> Subject: [gradsusr] convert world coordinate distance to real distance
>> (km)
>>
>> Dear every one
>>
>> I have problem with converting distance in world coordinate to distance,
>>
>> I have map with
>> lon = 135  135.5
>> lat = 34.5   35
>>
>> I want to set lon =135, as 0 km, and lat=34.5 as 0 km.
>> as we know that 1 deg is about 110 km.
>>
>> Is there any function in grads that can directly convert the world
>> coordinat distance to real distance (km)?
>>
>> Please, any help would be very appreciate.
>>
>> thank you
>> regards,
>> wendi
>>
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>
>
>
> --
> Jeff Duda
> Post-doctoral research associate
> University of Oklahoma School of Meteorology
>
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>
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