Re: phl.pm map

["Sean Cannon" <dodger@necrosoft.net>]

Would be pretty easy to do this with Image::Magick, too, particularly if you
had a map sized with a nice even number of minutes/degrees per pixel and
square.

You could not only generate the dotted map, but you could very easily use as
many colours as you want to code whatever, as well as the drawing of the
circles.

--
Dodger

----- Original Message -----
From: "Robert Spier" <rspier@pobox.com>
To: "Joe Smith" <jes@martnet.com>
Cc: <phl@lists.pm.org>; <list@la.pm.org>
Sent: Wednesday, September 26, 2001 12:38 AM
Subject: Re: phl.pm map


>
> Joe Smith writes:
> >Hi Rob, this is cool.  I've been looking for a way to generate this kind
of
> >map to do some simple demographics.  It might involve 150-200 locations
and
> >circles from a fixed location (e.g. within 3 miles).  Can Tiger do this?
> >Could you post a note to the list that outlines how you create the map?
As
> >far as I can tell, the Tiger map generator only does one point (or one at
a
> >time at least).
>
> Joe asked how I generate the map, so here's brief answer:
>
> 1. Drop data into a file that looks something like this:
>
> # Robert
> home: 34.186238  118.300898
> work: 34.171746  118.323148
> # etc...
>
> 2. Run simple perl script to convert it into tiger format, which looks
>    like this.
>
> #tms-data
> -118.300898,34.186238:bludot10:
> -118.323148,34.171746:reddot10:
>
>    This is what lets me put multiple points on the map.  It's
>    documented in the instructions document, which is a little hard to
>    find.
>
>     http://tiger.census.gov/instruct.html#MURL
>
> 3. Go to tiger web page, tell it the URL of the file generated in step
>    2.  Tweak settings of position, scale, size, etc.
>
> 4. Save generated .gif file and put on web somewhere.
>
> It's really that simple.
>
> Joe- as for your specific question about circles, I don't think it's
> possible - but, you could probably make circles with a little bit of
> math and some small dots, or just draw them on afterwards :)
>
> One thing to remember about Tiger, is a) it's free, and b) it's mostly
> unsupported.  It was an experiment, that thankfully (Thanks Lisa's
> coworkers!) they've kept running.
>
> -R
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