[Tiling] Fwd: [OSGeo-Standards] Irregular tile coverage in TMS?

[Mateusz Loskot]

Folks,

I have posted a little question about TMS spec to the standards,
but perhaps I could receive some feedback here as well:



-------- Original Message --------
Subject: [OSGeo-Standards] Irregular tile coverage in TMS?
Date: Sat, 11 Sep 2010 19:46:51 +0200
From: Mateusz Loskot <mateusz at loskot.net>
To: standards at lists.osgeo.org

Folks,

I'm reading the TMS spec which says:

"a coverage of regularly sized and spaced images that taken together
form a complete visual representation of the entire area of coverage"

I understand the size and spacing constraints.
What I'm missing, however, is what TMS says about "topological"
regularity of tiles within a coverage.

I attached basic drawing with two example tile coverages:

a) blue - regular coverage, rectangular

b) red - irregular coverage

Is only blue version kosher for TMS or both versions are valid?

Best regards,

-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org
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