| accessInformation:
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Erik O'Brian- initial revision;
Christian Hager-further revision;
Andrew Shaw- remaining revisions and documentation;
Ashley Summers- revision to ULM 2010;
References_Cited
constituent coverage citations:
esi-beg: from tnris web site (nwi?) http://www.tnris.state.tx.us
txdot: from tnris web site; provide majority of linework missing from nwi cov.
noaa: from digital nautical charts (for channel markers, beacons, etc.)
usgs: from 1:24k drgs
doqq: 1m digital ortho quarter quads
TPWD counties 2004 layer |