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Does a library exist for parsing the PDS files that scientific planetary data gets shipped as?

For example, here's a link to to the lunar topographic data from the Lunar Reconnaisance spacecraft (it's huge):

http://wms.lroc.asu.edu/lroc/global_product/256_ppd_DEM

I've seen the same format used elsewhere (for example, similar data from the Japanese Kaguya spacecraft).

Previously I've written custom parsers to massage the data into something I can actually use, but this is getting a bit complicated --- the LROC dataset has tiles of two different types of projection. What I'd really like is a library that I can just throw the PDS files at and say 'what is the data point for lat Y lon X' and have it give me an answer. Does such a thing exist?

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