Elevations in Oziexplorer

[strider01]

Hope someone has an answer for this!!

I loaded a Topoview map of Yengo with Ozi3d elevation toolbar open and I noticed when I run the cursor over the map the elevation data changes depending on the location.

No major find there, except when you run over a contour line you find that the elevation data doesn't match the contour height. I have found some really major differences of around 50m in only of short time of looking at the map.

Does anyone know why this might be so? Is the SRTM data for elevation therefore more accurate than the contour on the topo map?

Differences of such magnitude isn't a real problem when 4WDing but using this for radio path analysis makes it fairly useless for this purpose. Not that Ozi was ever created with this in mind I imagine.

[arthurking83]

I think you may find that'll be a cause of "less accurate" SRTM data.

Which data did you end up using?

If you find the Geoscience website(Oh! maaaannn! all these tabs are killing me ;))... Geoscience sells elevation data on CD/DVD which may be more accurate than the NASA SRTM data? (I think they also have this SRTM data available for download.. but the "more accurate data that you may want, you have to pay for...

Can't really remember the specifics... as you said..
Differences of such magnitude isn't a real problem when 4WDing but using this for radio path analysis makes it fairly useless for this purpose.

As a 4WDer I never needed anything more accurate.

Is there a specific area/state that you're after?
(do your radio towers cover all Aus?)

Maybe look to the relevant state mapping department for more(accurate) height data.

Ozi will only show you(on screen) what you have supplied as data.

Of course the contours on the map may not be a perfect representation of the actual elevation??? :confused-
Opens up another can'o'worms.... will the real accurate elevation data, please stand up! ;)

let us know how you get on.

[Michael]

When I am sailing the GPS often says we are at an elevation of 5 - 15 metres.
It is a very fast yacht, and we often claim we flew on the spinnaker legs of the race.
But I think this is another example of elevation data being just a little eratic.

regards Michael