Regardless of actual accuracy, USGS maps and geospatial products are intended for general reference and are not authoritative or official for navigation or for any regulatory purpose. The match between US Topo vector layers and the orthoimage layer is generally very good, evidence that the maps meet traditional accuracy standards for most feature classes in most areas. The production of these images is well controlled they have an accuracy of 6 meters (~20 feet) or better.
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This guide assumes that you have such a receiver, and also that you have one of the Mapsource PC products to go with it.
It is not possible to upload the maps to a non-mapping receiver. GPS File Depot The best source for US topo maps, this site also includes a limited selection of. TopoQuest Map Finder lets you search for USGS topographic map quads and view or.
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The orthoimage layer in US Topo maps is derived from images of the National Agriculture Imagery Program (NAIP). The SMC contour map data files are in a proprietary format, and can ONLY be used with Garmin mapping GPS units. GPSFileDepot Home Page - Free GPS Topo Maps for Garmin GPS Receivers. High-accuracy geospatial data is increasingly common, mostly due to Global Positioning System (GPS) technology. Topographic detail (1:24,000 scale) of select trail systems, featuring terrain contours, searchable points of interest and turn-by-turn directions.
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There are reasons to believe that the overall accuracy of the US Topo series is very good. Cycling Maps Trailhead Series TOPO 100K BirdsEye Select Raster TOPO 24K On the Trail Apps BirdsEye TOPO Raster TOPO BirdsEye Satellite Imagery HuntView TOPO PRO TOPO Light. Accuracy information for individual data sources is included in the metadata file that’s attached to each US Topo’s GeoPDF file (open the file in Acrobat Reader and click on the paperclip icon) and each GeoTIFF file. Find Geocaching GPS & Supplies here in Calgary, Alberta, Canada at GPSCentral.ca. US Topo maps, therefore, do not have a traditional accuracy statement in the map collar. We stock everything - Garmin GPS, Lowrance and Humminbird Marine Units, Satellite Phones, GPS Digital Maps and Charts, Amateur Radios and accessories, Metal Detectors, Binoculars, Ram Mounts and more We also offer tracking for personal and fleet applications by Bluefox Tracking Solutions.
US Topo maps are as accurate as the data sources used to make them, but because these sources are many and varied, it is not possible to make a single simple statement that the map as a whole meets a particular level of accuracy.
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