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In my GIS application the data are sometimes stored in "Google Mercator" (in meters), sometimes in WGS84 LatLon. I'd like a reliable library to convert this data easily and in a "scientific" way, rather than messing with it manually, risking big errors.
I've come across Proj4, which apparently is able to do this: http://trac.osgeo.org/proj
but I can't find a similar library for Java (or Groovy). Such a project would be highly beneficial, given that those projections are increasingly common in online applications. A little jar would be amazing :-)
There is a Java port, but there aren't any files to download: http://www.jhlabs.com/java/maps/proj/
Basically I need to do this type of conversion: http://proj4js.org
Any idea about how to do this in Java?
Thanks, Mulone
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The only factor that distinguishes different cylindrical map projections from one another is the scale used when spacing the parallel lines on the map.
Equivalent projections preserve areal relationships. This means that comparisons between sizes of land-masses (e.g., North America vs. Australia) can be properly made on equal area maps.
We have many different map projections because each has different patterns of distortion—there is more than one way to flatten an orange peel. Some projections can even preserve certain features of the Earth without distorting them, though they can't preserve everything.
Have a look at GeoTools. The bad thing is you don't get a little jar, but about a hundred.
This Tutorial might show something similiar to what you want to accomplish.
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