Thank you, Andrea,
Thanks for that info. I just wrote a quick UTM zone lookup java array
using the longitude west and east bonds to find the right EPSG code. Works
like a charm. Now my "2000" meter buffer in Hawaii is 2000 meters.
On Mon, Dec 19, 2016 at 3:02 AM, Andrea Aime <[email protected]>
wrote:
> Hi,
> we don't have facilities for doing that, but as long as the buffered
> distance
> is small, I believe you can pick a parametric projection and just center
> it on
> the area of interest.
>
> An azimuthal equidistant projection centered on the geometry to be buffered
> should do the trick. I have not tried, but believe you can template this
> WKT definition
> and change its center (central meridian, latitude of origin) according to
> your needs:
>
> PROJCS["World_Azimuthal_Equidistant",GEOGCS["GCS_WGS_
> 1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,
> 298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",
> 0.0174532925199433]],PROJECTION["Azimuthal_Equidistant"],PARAMETER["
> Central_Meridian",0.0],PARAMETER["Latitude_Of_Origin"
> ,0.0],UNIT["Meter",1.0]]
>
> and then use CRS.parseWKT to get the CoordinateReferenceSystem object that
> you'll use for reprojection.
>
> One downside, this projection has been added to GeoTools very recently,
> I'd recommend using the upcoming
> GeoTools 16.1 for it.
>
> If that does not work, you can pull the same/similar trick using a
> LambertAzimuthalEqualArea.
> Even a classic UTM would do, assuming your geometries are not too far up
> north, in which case you should consider a UPS instead.
>
> Hope this helps
>
> Cheers
> Andrea
>
>
> On Sun, Dec 18, 2016 at 11:18 PM, <[email protected]> wrote:
>
>> Hello List,
>>
>> Using Geotools, what's the standard practice for finding the appropriate
>> CRS to perform a buffer operation on a, say, Line Geometry?
>>
>>
>> I want to say
>> Geometry buffer = theGeom.buffer(1000); // 1000 meters.
>> First I need to transfo rm theGeom, but I don't know how to discover the
>> appropriate meter based CRS.
>> TheGeom could be Hawaii, it could be in New York.
>>
>> Thanks for any pointers.
>> -Thomas.
>>
>>
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