UTM: a transverse Mercator projection (Universal Transverse Mercator), dividing the Globe into 60 zones of 6° degree longitude each, based on geodetic datum WGS84 (World Geodetic System 1984) UTM with geodetic datum NAD83 (North America), GDA94 (Australia) or ETRS89 (Europe) can be treated as equivalent to WGS84 for TransDEM purposes. Benelux grids. A stereographic projection for the Netherlands, a Lambert projection for Belgium and a transverse Mercator projection for Luxembourg. One zone each. French grids: Older and newer Lambert projections. The older system has four zones, the newer system only one. Swiss and Austrian grids: An oblique Mercator projection for Switzerland and transverse Mercator (Gauss/Krueger) for Austria. One zone for the Swiss system, three for Austria. Eastern European and Russian grid: Two variants of the Pulkovo/Krassovski projections (transverse Mercator), several zones. Australian grids: transverse Mercator and Lambert projections for New South Wales, Victoria and South Australia. Older and newer systems. Lambert projections with one zone each. Forward map projection of the geographicWGS84 coordinates into Cartesian UTM coordinates. Exact transformation. GeoPDF: Proprietary format with georeferencing information embedded into pdf file. Requires GDAL utilities With version 1.2 TransDEM offers a WMS client to acquire map clippings from OGC compliant web servers, both single images and images along a path,. e.g. a railway line. Georeferencing will happen automatically. The TransDEM WMS client has many user options and comes with detailed documentation. The screenshot depicts 1:50000 map clippings of the island of Usedom, at the Baltic Sea, Germany, with the railway line, connecting the seaside resorts with the mainland. Map data available via WMS server operated by the state surveying agency: Amt für Geoinformation Mecklenburg-Vorpommern. TransDEM 1.3 added a Map Tile client to acquire map clippings via the map tile de-facto standard. a standard Mercator projection organized as a quad-tree for different zoom levels. Data available from various providers. This screenshot shows Open Street Map tiles, produced by the “transport” renderer, island of Usedom again, zoom level 13 (approx. 1:120,000) TransDEM allows semi-automatic georeferencing of Google Earth orthophotos. Necessary reference information is provided by a Google Earth placemark, which has to be created for each image. TransDEM reads the placemark and extracts coordinate information from it. The screenshot shows Heringsdorf railway station on the island of Usedom as a Google Earth image in combination with the 1:25000 topographical map. TransDEM allows to zoom the display window to the user's needs. Source.


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Last Modified: April 25, 2014 @ 12:00 am