[gradsusr] How to get grid distance within GrADS script?

[Hosmay Lopez]

Hello Ivan,

If grid spacing is what you need, you could follow the simple steps below.


* Earth's radius in meters

'define a=6.37*1E+06'


* Grid spacing of latitude (in radians)

'define dlat = cdiff(lat,y)*3.1415/180'


* Grid spacing of longitude (in radians)

'define dlon = cdiff(lon,x)*3.1415/180'


* Cosine of latitude for area weighting

'define coslat = cos(lat*3.1415/180)'


* Longitude grid spacing (meters)

'define dx = a*coslat*dlon'


* Latitude grid spacing (meters)

'define dy = a*dlat'

Hope this helps,

Hosmay Lopez
UM/CIMAS/RSMAS NOAA/AOML/PHOD
4301 Rickenbacker Causeway,
Miami, FL 33149, USA
Phone: (305) 361-4329

________________________________
From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on behalf of Ivan Toman [ivtoman at inet.hr]
Sent: Monday, June 06, 2016 3:07 PM
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] How to get grid distance within GrADS script?

Thanks,

but I needed value inside .gs script to do some automatic calculations there (for example automatically set vector density on map, regardless of grid distance, plotted area, ...).

Best regards,
Ivan


On 06/06/2016 07:15 PM, Anubhav Choudhary wrote:
hi ivan, if you just want the information,
just try--
cdo griddes filename

On Mon, Jun 6, 2016 at 10:27 PM, Ivan Toman <ivtoman at inet.hr<mailto:ivtoman at inet.hr>> wrote:
Hello again,

I found the way, if anyone is interested, I did this, for my application
works OK:

'set y 1'
laty1 = subwrd(result,4)
'set y 2'
laty2 = subwrd(result,4)
gridspacing=(laty2-laty1)*111


Best regards,
Ivan


On 06/03/2016 05:43 PM, Ivan Toman wrote:
> Hello,
>
> Is it possible to get grid distance value inside GrADS script somehow?
>
>
> Best regards and thanks!
>
> Ivan Toman
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--
Anubhav Choudhary
Ph.D. Student (UGC-JRF)
School of Environmental Sciences
Jawaharlal Nehru University, New Delhi

Ph: +91-8527706122
Email: yoursanubhav at gmail.com<mailto:yoursanubhav at gmail.com>



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