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| GeoCommunity Mailing List |
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| Subject: | [gislist] Van Der Grinten, countries, lat/long data, Flash,
issues... |
| Date: |
05/24/2004 03:25:01 PM |
| From: |
FB` |
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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.
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.
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...
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...
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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