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| Subject: | Re: [gislist] Van Der Grinten, countries, lat/long data, Flash,
issues... |
| Date: |
05/24/2004 03:30:01 PM |
| From: |
Brian Russo |
|
|
At Mon, May 24, 2004 at 03:27:20PM -0400, FB` wrote:
> Hi,
>
> Quite a kitchen-sink issue here, but any light shed on any part of
> this would be immensely helpful - please keep in mind that
> cartographically, I know very little, so what may seem obvious to you
> here might have completely escaped me.
>
> I'm developing a (seemingly) simple Flash-based map navigation tool,
> (slightly more complex than the one shown at
> http://www.computerlove.net, but with a similar basic function) and am
> facing the following issues, some of which I feel certain can be
> solved with the right kind of data/approach:
>
> An original world map to start with, which is a Van Der Grinten
> projection in Illustrator format, with some cropping, the specifics of
> which we know absolutely nothing about.
What software do you have to work with as far as stuff that handles
georeferenced data?
And what scale are you aiming for?
>
> This file is too detailed to use effectively in Flash - so the
> original issue is locating a reasonable substitute. We have discussed
> rolling our own from USGS data, but it seems like quite a long way to
> go for a simple map...
>
> However, the original vdg projection should be retained if at all
> possible, for its appearance.
>
> Then, I have a list of ~500 cities I need to plot on this map - and a
> reasonably good approach currently for determining the lat/long of
> each city (have much larger file, extract names as they appear in
> selected list, manually select from multiples)
>
> However, knowing as little as I do about the present map, the next
> problem presents itself: plotting those points on the map - I have
> thus far been unsuccessful in locating working code/formula to use for
> lat/long->vdg projection - so this is the first real need - if you
> know this, or can point me at a resource that explains it, please let
> me know.
Use either GIS software or something like NIMA GeoTrans to convert.
>
> The next problem is that of country names and leads into other
> country-related issues - the spec calls for country names to be shown
> within each country at a specific magnification - so I would need to
> be able to track down some data regarding the position of the center
> of gravity (so to speak) of each country... If this type of data
> exists... Additionally, a click-to-zoom-to-country functionality is
> desired, and for this, I figure data regarding the N,E,S,W-ern-most
> point in each country would be useful... otherwise, I'd have to enter
> coordinates/mag settings by hand...
Centroid of the polygon (more often actually the bounding rectangle)
should work ok in most cases.. manually adjust when it doesn't.
>
> Due to budget constraints, I can only really look into GPL/PD
> solutions to this problem - to that end, I have been browsing the GMT
> documentation, but nothing has jumped out just yet...
Mapserver is probably more useful than GMT here.. GMT is more useful for
gridded than vector data..
- bri
>
> If you can think of anything that may shed light on any part of it,
> please let me know.
>
>
> TIA
>
> FB`
>
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--
Recursivity. Call back if it happens again.
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