NoFlyPaul
I’m guessing that what you are trying to do is compare obstacle data from two separate commercial suppliers. I have never dealt with your normal supplier, but the other company uses AIP charts and an optical scanner to plot the position of the obstacles, these charts go out to a maximum distance of around 12 nm’s. (I can hear JT starting to scream at this stage…..
)
I would presume that your normal supplier uses a pretty similar system. It should therefore be relatively easy for you to obtain AIP charts for the airports that you want to review and plot the obstacles yourself. (Try
www.iata.aodb.org to download AIP charts.) Alternatively you could get the information from a topographical map of the airport area. The margin of error that you are looking for is ZERO.
The data that either supplier uses is only as good as they receive from the regulatory bodies. I have seen AIP obstacle data that was mixed up and gave the obstacles for the opposite end of the runway. So you will need some form of “human” review of this data before you start to use it operationally.
J_T and 4dogs, that’s actually the first time that I have heard about making amendments to the spot heights for vegetation. Our newest route is going to be to Peshewar (sp) in Pakistan, there is no way on earth that I’m going to stroll around this airport looking at the plant life……….
4dogs,
Australia (250 feet either side expanding at 12.5% until reaching LSALT),. Is there a maximum splay width?
Mutt
(Edited to add smiley things..)
[ 25 October 2001: Message edited by: mutt ]