Exporting calibrated maps – OpenStreetMap Wiki

Because embedding calibration in raster can't be explicit view read , people must use a tool like gdalinfo to be able to read text information.gdalinfo could be find in GDAL . GDAL (Geospatial Data Abstraction Library) is a library for reading and writing raster geospatial data formats. install this two tools ( gdalinfo,tool) in the same directory to be able to read the calibration information .Another way is to use gdal commandline as describe here after install FWTools (22.5 Mo) It should be possible to export calibrated maps from OSM servers. The map could be a raster (Tiles) or projection or vector files. This would make it quick and easy for someone to actually use OSM in their device and software of choice. A raster uncalibrate map can be easely downloaded using openstreetmap slippyMap by using the Export tab and select [renderers] (osmrenderer, manik) and output raster (JPEG, PNG). This is slightly complicated by the wide range of calibration file formats. The Taho Programs produce 5 different formats, but there are a few conversion programs around (see below) which suggests these should all be fairly interchangeable. Before a scanned map can be displayed in the correct location, it needs to be calibrated (geo-referenced). This process involves specifying the location of two or three known points on the map. Once the correct geographic coordinates are known for these points (called Calibration Points), a calibrate software can calculate the coordinates of every other point on the map. Every calibrate software need specific requirements: The calibration process step is to associate waypoint ( calibration point) from GPX to some wellknow waypoint in the raster file . Two calibration points are generally sufficient to geo-reference a topo map or nautical chart. If the lines of longitude on your map are not perfectly vertical, or if your map is rotated, you may need a third calibration point to correct for the rotation. Your scanned map is now calibrated and ready for use. The next time you want to view GPS data over this map, click Show Scanned Map on the View menu. If the map is a subset of a big map that come from a server , some tool can do all the work for you if you enter only the url of the server and the bounding box ( in a gui or script way). The tool manage calibration, merge raster graphic tiles and export all in one or two files . There are many calibrations softwares ( All professional gis software do this). Those kind of software are mainly use for navigate in area where there is no road [3]: MAPC2MAPC is a program to calibrate maps and convert calibration files for digital maps from one format to another. Will read and write MAP (Ozi), JPR (Memory-map, Fugawi), GMI (GPSTuner), GUX (GPSU), MCD (GPSMAPOS, GPSGO), CAL (Pathaway), TFW (Mapyx/Quo). Will also crop and re-size calibrated maps whilst retaining the calibration. Will handle different input datums but always writes WGS84. More information in the readme file. The software is provided 'as is' without warranty. It is free to download and use for personal or commercial purposes. Note that this program only converts calibration files that are held alongside image files - it will not convert maps in a proprietory format such as Memory-map's .qct files. Other sites can be used for specific programs, e.g. OSM to TrekBuddy at http://osm.bandnet.org/browse/?2030,1318,12,1 Source.

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Last Modified: November 29, 2014 @ 12:00 am