[DogParkList] MacLoggerDX Great Circle

[Don Agro]

Hi Stephane,

On 24-Nov-04, at 3:35 AM, stephane.winnepenninckx at agfa.com wrote:

> Don,
>
> Maybe there is a possibility to get a Azimuthal Equidistant map from:
>  http://www.wm7d.net/azproj.shtml
> and to use it in MacLoggerDX.
>
> This projection gives a map in which points on the same bearing lie 
> along straight lines.

A true 3D map shows points on the same bearing along the same circle - 
and it has the advantage of not being spatially distorted.

> Distance along those straight lines is proportional to distance along 
> the great circle with that bearing.

But the farther away you go from your location the more distorted and 
unreadable the map becomes.

> This projection is unique for each place on earth and a new map must 
> be calculated for each location.

Yes.

> This means that we need one map per QTH and that location on the map 
> has to be calculated differently. Not an impossible mission ;-)

But is it a desirable thing to do ?

Azimuthal Equidistant maps are easy to create - but the question 
remains - wouldn't you rather have a true 3D map like these ?
<http://dogparksoftware.com/mdpss.html>


73 Don Agro VE3VRW

D o g   P a r k   S o f t w a r e   L t d .

email: dagro at dogparksoftware.com
   www: http://www.dogparksoftware.com
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