Re: [svg-developers] US Map with US Census data
Hi Barend,
Thanks for the observations and grumbles! I was thinking of giving the
observer three choices:
(1)the one I've got now: a ratio of the region's value to the maximum
value on the scale, which in the case of some variables overly condenses
the chromatic range
(2) a measure which calibrates the value map according to a region's value
relative to min = light and max = dark
and
(3) one that merely rank orders the regions by value
The last would maximize visual discrimination of subtleties, while obscuring
quantitative magnitudes. I think (2) is probably what most maps do, so would
that make sense as a default presentation? It is sort of philosophically
between (1) and (3) .
Ultimately, I'd like the observer to be able to choose her own data spigot
from any URL on the web that presents a column of state-related data in
easily parseable form, or to meta-mine search data for queries like alabama
shoes through wyoming shoes from a search engine, to make the shell
infinitely extensible, but am trying to get permission from search providers
for such meta-mining.
I'll have to figure out a way to find the real estate for the title on
screens with funny aspect ratios.
A fun thing about this is how little server-side script there is, just ten
lines, and requiring just one linear pass of the dataset per user-chosen
variable -- that should, in theory, make it fast and extensible to very
large datasets. My understanding is that PHP caches a lot of the memory so
that reuse of the same data source may be optimized server-side:
?php
$f=/mydatafile;
$o=file($f);
$data=;
for ($i=0;$icount($o);$i++){
$line=explode(,,$o[$i]);
$data=$data.$line[$num].,;
}
echo $data;
?
best,
David
-
PS I'll need to learn a bit of an introduction to the cartographer's art and
science, since I suspect I'll be in over my head next semester. Tips like
this are sought!
- Original Message -
From: Barend Köbben kob...@itc.nl
To: svg-developers@yahoogroups.com
Sent: Tuesday, November 23, 2010 2:47 AM
Subject: Re: [svg-developers] US Map with US Census data
Nice.
cartographer grumble
don't use a value map (choropleth) for absolute values (data of
measurement level ratio),
Its perception properties makes for confused readers...
/cartographer grumble
:-) as an example of the power of SVG (for which I am sure it was meant), it
is of course excellent. Note that on a display with portrait ratio the map
is obscuring the title.
Yours,
--
Barend Köbben (Senior Lecturer)
ITC - University of Twente, Faculty of Geo-Information
Science and Earth Observation
PO Box 217, 7500AE Enschede (The Netherlands)
+31-(0)53 4874 253
From: ddailey ddai...@zoominternet.netmailto:ddai...@zoominternet.net
Reply-To:
svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com
svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com
Date: Sun, 21 Nov 2010 22:12:52 +0100
To: svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com
svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com
Subject: [svg-developers] US Map with US Census data
Here's a little something I cobbled together in the past couple of days.
http://granite.sru.edu/~ddailey/usmap.svg
It works in Opera, Firefox, Chrome and Safari, but not in ASV(IE). I've not
tested it in IE9, but would be interested to know if it works there.
I took a gnu-licensed SVG map from Wikimedia Commons and then wrote AJAX and
JavaScript and PHP to take data from the US Census bureau's 82 variable set,
shading the states accordingly. After a variable is chosen then you can
mouseover each state to see its numeric value on that variable.
Since it borrows from something with a GNU license I suppose you can't make
profit out of it, but feel free to improve and share!
cheers
David
[Non-text portions of this message have been removed]
Faculty of Geo-Information Science and Earth Observation (ITC)
University of Twente
Chamber of Commerce: 50130536
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Re: [svg-developers] US Map with US Census data
Nice. cartographer grumble don't use a value map (choropleth) for absolute values (data of measurement level ratio), Its perception properties makes for confused readers... /cartographer grumble :-) as an example of the power of SVG (for which I am sure it was meant), it is of course excellent. Note that on a display with portrait ratio the map is obscuring the title. Yours, -- Barend Köbben (Senior Lecturer) ITC - University of Twente, Faculty of Geo-Information Science and Earth Observation PO Box 217, 7500AE Enschede (The Netherlands) +31-(0)53 4874 253 From: ddailey ddai...@zoominternet.netmailto:ddai...@zoominternet.net Reply-To: svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com Date: Sun, 21 Nov 2010 22:12:52 +0100 To: svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com svg-developers@yahoogroups.commailto:svg-developers@yahoogroups.com Subject: [svg-developers] US Map with US Census data Here's a little something I cobbled together in the past couple of days. http://granite.sru.edu/~ddailey/usmap.svg It works in Opera, Firefox, Chrome and Safari, but not in ASV(IE). I've not tested it in IE9, but would be interested to know if it works there. I took a gnu-licensed SVG map from Wikimedia Commons and then wrote AJAX and JavaScript and PHP to take data from the US Census bureau's 82 variable set, shading the states accordingly. After a variable is chosen then you can mouseover each state to see its numeric value on that variable. Since it borrows from something with a GNU license I suppose you can't make profit out of it, but feel free to improve and share! cheers David [Non-text portions of this message have been removed] Faculty of Geo-Information Science and Earth Observation (ITC) University of Twente Chamber of Commerce: 50130536 E-mail disclaimer The information in this e-mail, including any attachments, is intended for the addressee only. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or action in relation to the content of this information is strictly prohibited. If you have received this e-mail by mistake, please delete the message and any attachment and inform the sender by return e-mail. ITC accepts no liability for any error or omission in the message content or for damage of any kind that may arise as a result of e-mail transmission. [Non-text portions of this message have been removed] - To unsubscribe send a message to: svg-developers-unsubscr...@yahoogroups.com -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) * To change settings via email: svg-developers-dig...@yahoogroups.com svg-developers-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: svg-developers-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[svg-developers] US Map with US Census data
Here's a little something I cobbled together in the past couple of days. http://granite.sru.edu/~ddailey/usmap.svg It works in Opera, Firefox, Chrome and Safari, but not in ASV(IE). I've not tested it in IE9, but would be interested to know if it works there. I took a gnu-licensed SVG map from Wikimedia Commons and then wrote AJAX and JavaScript and PHP to take data from the US Census bureau's 82 variable set, shading the states accordingly. After a variable is chosen then you can mouseover each state to see its numeric value on that variable. Since it borrows from something with a GNU license I suppose you can't make profit out of it, but feel free to improve and share! cheers David [Non-text portions of this message have been removed] - To unsubscribe send a message to: svg-developers-unsubscr...@yahoogroups.com -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/svg-developers/join (Yahoo! ID required) * To change settings via email: svg-developers-dig...@yahoogroups.com svg-developers-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: svg-developers-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
