Topo Maps: Frequently Asked Questions
What is a Topographic Map?
What information can I find on a topographic map?
What do the different colours represent?
Is a topo map similar to a road map?
What is "scale"?
What scale do I need?
Topo maps are interesting from several respects. They provide useful elevation data directly, and they can be overlaid on top of DEMs (see below).
5 topo maps in TIFF format and imported this to Erdas/Imagine and georeferenced this to the hardcopy version on a digitizing tablet (fig. 1.a).
You will see two folders, one containing a scanned, georeferenced topo map from the US Geological survey. There is also a folder for user data.
3D DEM (digital terrain model) can be created automatically from vectorized topo maps or XYZ point clouds and exported to USGS DEM format, as well as 3D VRML and STL formats for 3D printing applications.
meter panchromatic) land use/land cover map (derived from sSot image data), geology (generated from 1:80,000 geology map of the upper 2/3 part of the region), faults (from the same 1:80,000 geology map), hydrology (from the three 1:50,000 topo maps), ...
USA: TOPO Maps on CD-ROM
USA: EarthVisions -- commercial purveyor of US topo maps
USA: PepperWhite -- supplier of mapping and geographic information system components for software developers ...
If you travel with a GPS unit and laptop PC, USAPhotoMaps can display your real-time track on a photo or topo map as you move. Simply connect the GPS unit to your laptop PC via a serial cable, start USAPhotoMaps, and select "GPS>Show Location".
Fragment of the Dutch topo map showing the border of Belgium and the Netherlands. The Mean Sea Level of Belgium differ -2.34m from the MSL of The Netherlands. As a result , contour lines are abruptly ending at the border.
Recently, the USGS has begun releasing 'metric' topo maps. These maps are based upon a new State Plane Coordinate System based on the NAD83 datum. This system is significantly different than the older system based on the NAD27 datum.
Invented by Giovanni Cassini Used for topo maps in France until 1803 Modified in 1810 by Soldner and used for topo maps in U.K. and German States Declined use in 20th century
Transverse Mercator ...
Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5° grid, they are often called topo quads (or quadrangles).
A map containing contours indicating lines of equal surface elevation (relief), often referred to as topo maps.
2. Often used to refer to a map sheet published by the U.S. Geological Survey in the 7.
quadrangle (quad) : Typically refers to a map sheet published by the U.S. Geological Survey, a 7.5 minute quadrangle series or the 15 minute quadrangle series. Also known as a topographic or topo map.
About paradigm IT ...
by chosing between, X,Y, Latitude-Longitude, UTM, or "other" coordinate system. This choice depends on your data and the use you will make of it.
You are then prompted for a single line of text describing the project area, for example "Topo Map of ...
The outline is generally defined by latitude or longitude. Typically refers to USGS topographic maps or to a map sheet published by the U.S. Geological Survey. Also known as a topographic or topo map.
 See also: Map, Mapping, Information, GIS, Digital
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