Hi Michael - I'm not sure I'm distinguishing theory from practice (or what's practical) - maybe this thought exercise is between the two overlapping spheres.
What's pragmatic covers a lot of stuff; my use here is utilitarian and not necessarily deciding about what's "real" or "true" - I just need a tool for structuring data and points and polygons are not practical for me. I need a simple framework to associate geo-spatial location with measured attributes. Right now that framework is just a theory with a pragmatic need to test it among many minds who think in geo-spatial terms and aren't afraid to write them down and share it with each other. - Brian michael gould wrote: > Brian: I wonder what is pragmatic (or do you mean practical?) about the > below exercise. Pragmatics is another thing...proposed by a practicing > geodesist (CS Peirce) by the way...aimed at truth testing. > > And then I agree with Paul (see message 2 below), that categorization is, > uh, rather important to knowledge. I recommend George Lakoff's "Women, fire > and dangerous things" on the subject (if bored, skip to chapter 16). By the > ways categories do not need to be fixed, but can also be graded. The Pope > may not be a bachelor if a fixed definition is used, however his > bachelorness can be quite high all the same :-) > > -- > > Message: 1 > Date: Fri, 04 Jul 2008 10:17:23 -0400 > From: Brian Grant <[EMAIL PROTECTED]> > Subject: [Geowanking] pragmatic exercise > To: [email protected] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > as a pragmatic exercise allow me to start with a map and end with a database > schema. > > begin with a Fuller projection > (http://en.wikipedia.org/wiki/Fuller_projection) an icosahedral framework of > 20 triangular areas (actually tetrahedra to the center - but we'll leave > that out for now). Each triangular area is designated a Major Triad. > > Each Major Triad is subdivided ** by the same base as the original sphere ** > into 400 Minor Triads (20^2). If the edge of a Major Triad is 8,000 km the > edges of the Minor Triads are 400 km. Major Triads are designated with > characters A through T; Minor Triads are designated AA through TT. > > Minor Triads are further subdivided into Trixels (or whatever) again by the > same base creating a recursive triangular mesh capable of defining unique > triangular regions 2.5 m on edge with 13 characters. > > Forgive me as it may be apparent by now that I'm not a geographer. I'm an > application engineer that builds wireless sensor networks and needs a place > to store data based on sensor location - sometimes static - sometimes > mobile. I've got networks in the US, Pacific islands, India and Europe. This > Recursive Triangular Mesh is what I'm using to do it. > > The database schema is nothing more than a wiki with a directory structure > that looks like "D/FH/KP/ET/SA/RO" - addressing a unique area of less than 3 > square meters directly converted from a Lat/Long point. > > My other concern is the precision and accuracy of the location measuring > instrument - how many digits does my GPS provide? It defines the size of the > final Trixel. > > - Brian > > > ------------------------------ > > Message: 2 > Date: Fri, 4 Jul 2008 08:30:48 -0700 > From: "Paul Ramsey" <[EMAIL PROTECTED]> > Subject: Re: [Geowanking] polarized light etc > To: [email protected] > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1 > > Ah, you just want to discard all of Western thought back to Aristotle. > And here I thought you were a wanker. (categorization) > > P > > On Fri, Jul 4, 2008 at 2:07 AM, stephen white <[EMAIL PROTECTED]> wrote: >> On 04/07/2008, at 5:24 PM, Will King wrote: >>> So give us a sample problem, no waffle, Stephen and the pragmatists >>> on geowanking will probably come up with a pretty good solution. >> >> How can we organise all forms of captured information without >> categorising? Voxels? Turing? Red dots? Layers? >> >> That problem has the pre-requisite that you agree that categorisation >> damages information. >> >> -- >> [EMAIL PROTECTED] > > [..cut] > ______________________________________________ > Michael Gould > Dept. Information Systems (LSI) > Universitat Jaume I, 12071 Castellón, Spain. > email: gould (at) lsi.uji.es > www.geoinfo.uji.es > > > > > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG. > Version: 8.0.136 / Virus Database: 270.4.5/1536 - Release Date: 7/5/2008 > 10:15 AM _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
