[Thread Prev][Thread Next][Index]

Re: [ferret_users] Changing X_axis and Y-axis



Hello Mr. Martin

The verical_section.jnl didn't quite help me but samplexy_demo.jnl mentioned in that script has solved my problem. 

Thank you very much! 

Regards,
B.Yadidya 

On 8 Feb 2017 8:44 p.m., "Martin Schmidt" <martin.schmidt@xxxxxxxxxxxxxxxxx> wrote:
Hi,
I would like to draw your attention to the script vertical_section.jnl. Please type

go/help vertical_section

for more details.

Best,
Martin
On 02/08/2017 01:24 PM, Yadidya Badarvada wrote:
Hello Mr. Ryo

My main objective is to find the vertical structure of the currents flowing parallel to the coast, so that's why i took a perpendicular section from the coast.

Regards, 
B.Yadidya


On 8 Feb 2017 5:33 p.m., "Ryo Furue" <furue@xxxxxxxxxx> wrote:
Hi Yadidya,

I don't know how to do it within Ferret only. I'll describe what I would do.

On Wed, Feb 8, 2017 at 6:37 PM, Yadidya Badarvada <israeljedidiah@xxxxxxxxx> wrote:

I'm looking to the vertical profile of the ocean currents 200 km from the shoreline.
If the shoreline is exactly perpendicular to any latitude or longitude then it's very easy to just select that particular latitude (longitude) and see  get the profile of the current with varying longitude (latitude). But unfortunately, most of the coastlines are not perpendicular to any lat or long but are at an angle.
 
So, how do I get the vertical profile of the current(or anything) perpendicular from the coast to a certain distance ?

First of all, 200 km in the direction perpendicular to the coast line may not be what you want. Let's imagine drawing a curvy coastline. Let's stick out 200-km-long line segments in the directions perpendicular to the coastline from points on the coastline. We'll find some line segments cross each other when the coastline is concave.  That is, the tips of the line segments may not form a simple curve.

What I would do instead is first to "paint" the land.  Then I would draw a circle with a 200-km radius centered at a point on the coastline and "paint" the area enclosed by the circle. Repeat this for all the points on the coastline. Then I would get a new area which is extended by 200 km from the original land.  (If you have ever seen a map of the EEZ of a country, you get the idea.)

Next find the edge points of this new area (Somebody posted a Ferret way to detect the edge of an area in this mailing list).  This is the set of ocean points for which the closest land point is 200 km away.  This is ONE definition of a curve 200 km off the coast.

I would do this all in Fortran but somebody may help you do it i Ferret.

Cheers,

Ryo



[Thread Prev][Thread Next][Index]
Contact Us
Dept of Commerce / NOAA / OAR / PMEL / Ferret

Privacy Policy | Disclaimer | Accessibility Statement