Hi Ari,
I checked out the repo and tried this from a Python prompt:
>>> import fiona
>>> from shapely.geometry import shape
>>> with fiona.drivers():
... with fiona.open('poly_test/polygon.shp') as src:
... for f in src:
... print shape(f['geometry']).area
...
660.036866573
635.789329099
That's what you expect, right? Fiona and Shapely are doing the right thing,
so I think there could be misplaced coordinates in your triangles.
Thanks for providing a link to the repo, it makes debugging a lot easier!
On Tue, Feb 25, 2014 at 2:54 AM, Ari Simmons <ari.ucb.f...@gmail.com> wrote:
>
> ..data is in Pseudo Mercator...unit meters...in Georgia/Florida
> whereabouts...and still under 700 sq meters...
>
> On Tue, Feb 25, 2014 at 1:46 AM, Ari Simmons <ari.ucb.f...@gmail.com>wrote:
>
>> Hello (again)...
>>
>> I am attempting to re-create yet another Visvilingam simplify algorithm
>> using Shapely/Fiona (...this is mostly an effort to experiment with
>> Fiona/Shapely).
>>
>> I have some test data (trivial in size -- polygons under 700 sq meters),
>> but in calculating the triangles (which all should be less then 700 sq.
>> meters)...I am pulling out areas in the millions.
>>
>> I've exhaustively run through the way I am picking up points (and
>> calculating area)...so to try this a different way...could this all have
>> something to do with the Fiona reading/writing...? A projection issue
>> perhaps...? From what I can tell the file reads and outputs fine -- I am
>> just getting really large areas out of my 'not that big' polygons.
>>
>> Anybody ever had something like this come up? Or have a tip...
>>
>> P.S> I didn't really think posting my code is going to be that helpful,
>> but here is a link to my Git[2] if nothing I said above computes...since
>> the test data was small I added it in too...
>>
>>
>> [1]: https://pypi.python.org/pypi/Fiona . I modeled most the read/write
>> code based on what I found on the site ...but in my noobness might be
>> totally not getting it...
>> [2]: https://github.com/ARSimmons/Shapely_Fiona_Visvalingam_Simplify
>> my git, with code and the trivial size polygons if you want to see what I
>> mean...
>>
>
>
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--
Sean Gillies
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