Yes. On average, the Forest Service updates its maps every 2 to 7 years. For some maps where little change occurs, revision may not be scheduled for many years.
USGS does not currently offer vector downloads in bulk other than by special request only.
Almost 179,000 USGS historical topographic maps are available free of charge as PDF documents.
Instructions for downloading from The National Map viewer are located in a Download and Cart user guide. Orthoimagery is downloaded with the following steps:
Select the Print icon in the upper right-hand corner. You can save and print a map either in PDF, JPEG, or PNG formats. PDF allows the user to include map elements in the header, such as a title and notes.
The Add Data tool in the Advanced toolbar allows you to add an ArcGIS Server (AGS) REST service, Keyhole Markup Language (KML) data file, Really Simple Syndication (RSS), Web Map Service (WMS), or Web Map Tile Service (WMTS) to the map display. Before
PLSS data is available in the Content sub-tab under Overlays in a panel called Other Featured Data in the table of contents of The National Map viewer.
The National Map Viewer Quick Start Guide can be found here.
USGS Digital elevation models (DEMs) are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM) projection or to a geographic coordinate system.
Open Issues/Key Notes(last updated: 6/26/2015)Viewer
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