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[aprssig] strange map behavior

Gerry Creager N5JXS gerry.creager at tamu.edu
Mon Aug 30 01:08:30 UTC 2004


Got a better shapefile archive James can use?

WA8LMF at aol.com wrote:
> Art Snapper wrote on 8/28/2004, 8:22 PM:
> 
>  > I have been playing around with aprs on my sail oat (nk8x-8) on Lake
>  > Michigan. The maps on findu.com and aprsworld.net behave strangely for
>  > plots on the lake. I captured a plot and saved it here:
>  > http://lakemichiganfun.com/plot.png
>  > Perhaps this is an old problem. I subscribe to the APRS sig in a
>  > digest and must confess to not reading all the posts!
>  >
>  >
> 
> The aprsworld maps that are used by findu are composed (like most GIS 
> and map display systems) of multiple layers of data displayed one on top 
> of the other.  Highways, city streets, state and county boundries, etc 
> may come from different sources with wildly differing levels of 
> completeness and accuracy.
> 
> There appear to be numerous errors and omissions in the database 
> aprsworld uses to place bodies of water (ocean coastline, lakes, rivers 
> and streams, etc) on the maps.  I have noticed here on the west coast 
> that many portions of the Pacific Coast Highway are "under water" also 
> while several major lakes and reservoirs don't show at all!
> 
> 
> 
> 
> 
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843





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