[postgis-devel] [raster] Implementations of rotation and pixel size.

[David Zwarg]

Bryce,

That's a great idea. I had some questions about it, and I think it'll be
helpful for folks seeking to understand the worldfile and affine
transformations. I know it wasn't straightforward, and it took me a minute
to wrap my head around it (even then, I may not have gotten it 100% right,
as you have noticed).  As a wiki page, it would be a great resource.

I had used the wikipedia page as my starting point when I was working with
the raster rotation stuff: http://en.wikipedia.org/wiki/World_file

Thanks,
David

On Mon, Sep 12, 2011 at 1:30 PM, Bryce L Nordgren <bnordgren at gmail.com>wrote:

> On Mon, Sep 12, 2011 at 5:08 PM, David Zwarg <dzwarg+postgis at azavea.com>
> wrote:
> > In addition, I'm at FOSS4G this week -- any chance you're attending so we
> > can discuss the other details of your email? I'm more interested in doing
> > this "right" than doing it some hacky way (I'm not a math whiz, and my
> > initial efforts may not have been totally correct -- I'm more than happy
> to
> > change the calculations to be correct).
>
> I'm super lame and am not attending. :) I'm going to try and virtually
> attend the code sprint on saturday via IRC.
>
> However, I was thinking I should probably recast that email onto a
> developer's wiki page with real equation formatting. If you can edit
> or ask questions on what is unclear, it could become a good reference
> for these parameters which are otherwise somewhat mysterious.
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