filepro & maps

[John Esak]

Wow! Ryan, that is the simplest decoding of that particular algorithm I've
ever seen. Thanks!

BTW, when I visited FP Tech when it was a subsidiary of Fiserve, I saw some
of Ryan's work with maps (and filePro). Amazging...  Did any of that stuff
ever turn into a product Ryan?

Thanks again, I don't have much use for this right now... but if ever I need
a way to do this in future, perhaps for our drivers... this is great.

John


> -----Original Message-----
> From: filepro-list-bounces at lists.celestial.com
> [mailto:filepro-list-bounces at lists.celestial.com]On Behalf Of
> ryan at bulldogsoftware.com
> Sent: Sunday, November 06, 2005 3:57 PM
> To: Linda Hapner
> Cc: FPList
> Subject: Re: filepro & maps
>
>
> On Thu, Nov 03, 2005 at 06:30:09PM -0600, Linda Hapner said:
>
> > has anyone ever worked with a filepro database of GPS
> coordinates to develop a map?
> >
> > We have the maps
> > We have the data
> >
> > need specific dots and number to be plotted on the maps based
> on the data.
>
> What I have done in the past goes something like this:
>
> 1. Convert all coordinates to seconds.
> (Degrees x 3600) + (Minutes x 60) + Seconds.
>
> 2. Establish your origin in lat/long seconds.
>
> 3. Establish your extent in lat/long seconds.
>
> 4. Using 3 & 2 and your resolution, calculate your ratio of
> pixels per second
> in both directions. Thats one ratio for latitude and another for
> longitude.
>
> Then given the target coordinates you will be able to approximate the
> location on the map.
>
> Remember that lines of longitude converge at the poles and therefore
> the longitudinal ratio is only an approximation. There is a formula that
> you can use but I don't have it handy. But for large-scale maps such
> as an entire town it wouldn't be a factor.
>
> --
> Ryan Powers
> Bulldog Software, Inc.
> http://www.bulldogsoftware.com
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