[ferret_users] Sample a field along a set of line segments?

["William S. Kessler" <William.S.Kessler@xxxxxxxx>]

I want to sample a field along a line defined by a set of (x,y)  
points. Clearly I could use SAMPLEXY to extract the values at the  
given points, but I want to, in effect, draw straight lines between  
those points and sample all along those lines.

It is necessary to say how densely I want to sample, that is, how  
many intermediate points to add in between the given ones. Suppose I  
want to add an intermediate point at each value of the x-grid of the  
field to be sampled. As an example, suppose I have two points (155,7)  
and (158,13), and my background grid is 1 by 1, on integers. The  
points I want to add would be (156,9) and (157,11). How can I find  
those points and augment my original set to include them? Then I can  
use SAMPLEXY to sample the field.

Billy K
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
William S. Kessler
NOAA / Pacific Marine Environmental Laboratory
7600 Sand Point Way NE
Seattle WA 98115 USA

william.s.kessler@noaa.gov
Tel: 206-526-6221
Fax: 206-526-6744
Home page: http://www.pmel.noaa.gov/people/kessler/