Re: [Geotools-gt2-users] Properly Reducing Decimal Precision

[Jason F. <fer...@gm...>]

Okay, it's looking like TopologyPreservingSimplifier is what I need.
However, a question: how do I determine what value to use for the
distance tolerance? The only example I found used a value of 0.1, so I
don't know if that simplifies to 0.1 (meters/feet/whatever), or it
means something else. In general, I'm happy with 1.5 Meters or 5 feet
or so.

Jason

On Mon, May 23, 2011 at 9:58 PM, Jody Garnett <jod...@gm...> wrote:
> JTS does provided a Precision object you can use with a Gometry factory to
> explicitly control precision. That combined with simplify geometry
> operations should give you the control you need?
> Note we also make use of "decimation" to skip over points that would
> otherwise render into the same pixel; perhaps that code could be a useful
> example for you?
> While there is a page in the user guide
> (http://docs.geotools.org/latest/userguide/library/jts/simplify.html) I
> could really use a code example if you can produce one :-)
>
> --
> Jody Garnett
>
> On Tuesday, 24 May 2011 at 10:47 AM, Jason Ferguson wrote:
>
> I am attempting to store data from the TIGER/Line shapefiles into a
> database table, but am having issues with reducing the precision from
> the 5 decimal places to 3 decimal places.
>
> What I find is that after I dig down and get the coordinates, then
> eliminate duplicates, I'm left with a list of coordinates something
> like this (which I call semi-duplicates for lack of a better term):
>
> 45.900, 178.353
> 45.900, 178.355
> 45.900, 178.361
> 45.900, 178.363
>
> I end up with the same latitude, but several intermediate longitudes
> (or vice versa). I don't need all of these intermediate points, but I
> realize that this is an artifact of brute force rounding.
>
> Is there a "better" way to reduce the decimal precision?
>
> Jason
>
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