![]() ![]() Accessing the information you need is easier and quicker than ever. Filters and searches work seamlessly with the map records table to get you the info you need with fewer clicks. We've added the ability to preview maps within the interface and give you tools to compare any historical map with maps of the present. The latest version of topoView is full of enhancements based on hundreds of your comments and suggestions. ![]() New functionality driven by your feedback Like the historical topographic mapping collection, we've added a variety of file formats previously unavailable for the US Topo series, including GeoTIFF and KMZ. ![]() The US Topo series is a latest generation of topographic maps modeled on the USGS historical 7.5-minute series (created from 1947-1992). We've added the US Topo series to topoView, giving users access to over 3 million downloadable files from 2009 to the present day. The NGMDB project is proud to assist the NGP in bringing these maps to the Web. The point of this example is to illustrate a quirk of using raster fill with transparency. Geologic and topographic mapping have a long tradition together (see 1888 report). toporaster7.ncl This example is almost identical to topo7.ncl above except the reflectivity values are drawn as raster filled contours instead of smooth contours. This interface was created by the National Geologic Map Database project (NGMDB), in support of the topographic mapping program, managed by the USGS National Geospatial Program (NGP). TopoView shows the many and varied older maps of each area, and so is especially useful for historical purposes-for example, the names of some natural and cultural features have changed over time, and the historical names can be found on many of these topographic maps. Digital Elevation Models (DEMs) are one of the most commonly used rasters for GIS folks and well be. Digital Raster Graphics JanuView Web Tool Digital raster graphic (DRG) files are being redistributed through this Web site as a service to program partners of the Upper Midwest Environmental Sciences Center. The most current map of each area is available from The National Map. Topo maps can be downloaded from the USGS web site. As the years passed, the USGS produced new map versions of each area. This mapping was done at different levels of detail, in order to support various land use and other purposes. In 1879, the USGS began to map the Nation's topography. TopoView highlights one of the USGS's most important and useful products, the topographic map. ![]()
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