ben at vterrain.org
Wed Apr 2 12:36:10 PST 2003
Hi Daniel, welcome,
Interesting idea at ThereThen. Some feedback.
The first thing it made me think of was the DotGeo/GeoWeb initiative
(http://www.dgeo.org/), shot down by ICANN. Didn't see this effort linked
from the ThereThen site ("Other Web Sites Of Interest").
The DotGeo guys (SRI/TerraVision) did their own 'photo database project'. I
saw it one time on a visit to SRI, before they had to leave the ivory tower.
ThereThen says "Implementation of this does not require any change to
existing web documents." Well.... that's literally true, but it does
require producing a whole new site layout and filing each document into it
own directory. That's potentially more work than just changing the
Regarding how to find the lon/lat corners around a point, i could suggest
many ways to do this of varying simplicity and accuracy, but i would ask the
larger question of why do you want to do it? If it's to find all points
that a "close" to a given point, why not just use geodetic distance?
Background references: http://vterrain.org/Misc/distance.html
P.S. miles? Eeeeek! km please!
> -----Original Message-----
> From: geowanking-admin at lists.burri.to
> [mailto:geowanking-admin at lists.burri.to]On Behalf Of Daniel Smith
> Sent: Wednesday, April 02, 2003 2:30 PM
> To: geowanking at lists.burri.to
> Subject: [Geowanking] intro
> Thanks for the list invite Peter & Joshua.
> I wrote up the idea of ThereThen addresses
> at http://ThereAndThen.org (this is more
> for the archives, I am aware you already know this :-)
> I'm bringing daniel.org up to speed, after having
> neglected it for many years, and started a blog at
> My interest in searching by location and time grows
> out of a photo database project (Apache/MySQL/PHP)
> I am developing.
> I'm not familiar with GIS stuff in general, so one of
> my questions these days would be "how do find the long/lat of
> the four corners around a centered point, say for a 10x10
> mile square?" (in other words, algorithm for "locations nearby",
> and knowing that the corners are actually 7.07 miles
> from the center... 45/45/90...)
> Daniel L. Smith - Sonoma County, CA - AIM: SonomaDaniel
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