[MLB-WIRELESS] Node details and antenna altitude value

[mw at freenet.net.au]

Hi All,

 

I've been doing a bit of work on the Melbournewireless web site to fix up
the mapping features and add some enhancements that have become available
with new google map functionality released recently.  One of the features
I've been playing with is a terrain profiler view that shows line of sight
between two selected nodes, which by itself is rather cool - check out an
example here:

                http://dev.melbournewireless.org.au/maps/compare?id_1=KBN
<http://dev.melbournewireless.org.au/maps/compare?id_1=KBN&id_2=KBQ>
&id_2=KBQ

 

Note that the profiler uses the data entered in node details to also
represent the height above ground level that the antenna is installed. 

 

What I discovered while testing out these functions is that some nodes have
height above sea level entered for anytenna height instead of height above
ground.  The end result is that the profiler view is way inaccurate.  Take
this one for example:

                

 

It has antenna height above ground level set to more than 400m which is such
a tall mast that it could get a line right over the top of mount macedon
from the plains on each side ;-D

 

I won't write here which nodes they are because I don't want to single out
one person when probably several others have made the same easy mistake ;-)

 

In any case, in preparation to these features going live, it will be useful
if folks take a look at their node definitions and just check that
'altitude' entered is above local terrain height rather than above sea level
;)

 

Cheers!

Mike.

 

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