Re: [Geotools-devel] CRS AutoFactory?

[Jody G. <jga...@re...>]

Here is a link: http://www.opengis.org/docs/01-068r3.pdf

> I have been enjoying the high quality CRS classes and reprojection 
> services over the last while. And may have finally hit on something I 
> can contribute.
>
> Is automatic projections supported?  (See Annex E of OGC 01-068r3)
>
> Basically it would be a new factory that takes something like WKT (is 
> it wkt?):
>
>> The definitions use OGC Well-Known Text (WKT) format. In the notation 
>> below,
>> "${var}" is a reference to the value of variable "var". The variables 
>> "lon0" and "lat0"
>> are the central point of the projection appearing in the SRS 
>> parameter of the map request
>> (see Section 6.5.5.2).
>
> PROJCS["WGS 84 / Auto UTM",
>    GEOGCS["WGS 84",
>    DATUM["WGS_1984",
>    SPHEROID["WGS_1984", 6378137, 298.257223563]],
>    PRIMEM["Greenwich", 0],
>    UNIT["Decimal_Degree", 0.0174532925199433]],
>    PROJECTION["Transverse_Mercator"],
>    PARAMETER["Central_Meridian", ${central_meridian}],
>    PARAMETER["Latitude_of_Origin", 0],
>    PARAMETER["False_Easting", 500000],
>    PARAMETER["False_Northing", ${false_northing}],
>    PARAMETER["Scale_Factor", 0.9996],
>    UNIT["Meter", 1]]
>
> where
>    central_meridian = -183.0 + ${zone} * 6.0
>    zone = min( floor( (${lon0} + 180.0) / 6.0 ) + 1, 60 )
>    false_northing = (${lat0} >= 0.0) ? 0.0 : 10000000.0
>
> I was thinking of setting up an AutoFactory to handle things like this...
>
> I just wanted to check:
> - of this had already been done?
> - is this something geserver has already done for its wms support?
> - is this even a good idea (remember I also thought a property file of 
> EPSG to WKT codes would be fun)
>
> Cheers,
> Jody
>
> BTW - this is a great week - I love to see the list (and developers so 
> active)!
>
>
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