Altitude in Km above sea level for a given pair of coordinates (lat,long)

Calculates the altitude of any site in the world, in Km above sea level.

Description

%function alt_km=ITU_P1511(lat,long)
%computes altitude of a site at given lat,long coordinates
%by means of bicubic interpolation using itu topo 0.5 degrees resolution
%matrix.
%refer to ITU-R Recommendation P 1511.
%
%INPUTS
%lat: latitude + = North, -=south
%long: longitude, positive degrees East.
%
%Required data: TOPO_0d5.txt, available from the ITU-R SG3 software site
%http://www.itu.int/ITU-R/study-groups/software/rsg3-p1511-topography.zip
%http://www.itu.int/ITU-R/index.asp?category=documents&link=rsg3&lang=en
%example of usage:
%alt_km=ITU_P1511(52,0); %somewhere in the UK
%Luis Emiliani. Rel. 16/01/2009

• MATLAB release: MATLAB 7 (R14)

[OH]

Error in ==> ITU_P1511 at 20
I=find(long<0);
 
??? Input argument "long" is undefined.

[luis emiliani]

itu data location:

http://www.itu.int/ITU-R/index.asp?category=study-groups&rlink=rsg3-software-ionospheric&lang=en

make sure you paste all the url in the browser.