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The National Map, a collaborative effort between the USGS and other agencies and partners, includes ortho imagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures, and land cover.
There are a variety of freeware and shareware tools as well as other commercial software tools available to support metadata development. These tools offer a range of features and capabilities. FGDC provides a short list of questions to help you evaluate which tool to consider.
A National inventory of U.S. terrestrial and marine protected areas that are dedicated to the preservation of biological diversity and to other natural, recreation and cultural uses, managed for these purposes through legal or other effective means.