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@@ -0,0 +1,133 @@ +====== +gipfel +====== + +gipfel is a tool to find the names of mountains or points of interest +on a picture. +It uses a database containing names and GPS data. With the given viewpoint +(the point from which the picture was taken) and two known mountains +on the picture, gipfel can compute all parameters needed to compute the +positions of other mountains on the picture. +Additionally, gipfel can try to guess these parameter if only one mountain +is known on the picture. In this case, a few other peaks need to be marked, +but it is not necassary to know their names. +gipfel can also be used to play around with the parameters manually. But be +warned: It is pretty difficult to find the right parameters for a given +picture manually. + + +Requirements +============ +- gipfel works on UNIX-like system (e.g. Linux, *BSD and probably others). +- You need fltk-1.1.x from www.fltk.org. +- You need the ccmath library (http://freshmeat.net/projects/ccmath/). + + +Installation +============ +- Unpack the tar file and run ./configure; make; make install + + +The Data File +============= +As stated before, gipfel needs GPS input data. The input data must be +an ASCII file with one line per mountain / point of interest. +Each line must contain the following values separated by a comma: + +<SHORTNAME>,<NAME>,<DESCRIPTION>,<LATITUDE>,<LONGITUDE>,<HEIGHT> + +<SHORTNAME> and <DESCRIPTION> may be left empty. + +The following line is a valid example: +SMTSBG,Simetsberg,,47.56617,11.25358,1836 + +Fortunately, there is a great website http://www.alpin-koordinaten.de, where +you can download a suitable file containg quite a lot of data mostly +concerning the alps: +Click on the "Suchen" button and the click on the diskette symbol below +the first table then select "Fugawi 3 TXT" format and click on "Download". + +The resulting file has already the right syntax for gipfel, but contains +some duplicate entries. Use: +sort -u -t , -k 2,2 <infile> > <outfile> +to remove these duplicate entries. + +Obviously you can easily add your own entries to the data file or add them +to the database at http://www.alpin-koordinaten.de. + + +Running +======= + +To start gipfel, enter + +gipfel -v <viewpoint> -d <datafile> <image> + +Where <viewpoint> is the name of the location from which the picture has +been taken. This name must be found exactly in the datafile. +<datafile> is the file conatining the GPS data. +<image> is the actual picture in JPEG format. + +You should now see a control window and the actual picture. +You can now use the controls in the control window to modify the view +paramaters. These are: +- View direction +- Nick angle +- Tilt angle +- Scale +- Visibility + +Play around with these parameters, until you see the names of one or two +mountains, which you already recognize on the picture. +Now click on the small cross at the left of the name to mark it and drag +them to the position of the mountain on the picture. +The marked mountains should now have a red flag. +If you have positioned two mountains, you can now click on the "comp" button +in the control window. +If you have only marked one mountain, you need to mark other peaks on the +picture using the green flags which you find at the center of the picture. +Make sure, that the one marked mountain has a red flag containing a "1" if +it has a "2" in its flag, just keep clicking on it until it changes to a "1". +Then click on the "guess" button. If the result is disapointing, try to adjust +the visibility parameter as only visible mountains are taken into account +during the "guess"-process. + + +Troubleshooting +=============== + +- Obviously gipfel can only be as good as its input data. If there is now +data about the mountains on your picture, you are out of luck... +But as the data file format is pretty simple and GPS receivers are common, +you can build up your own datafile. + +- gipfel only works with full normal unmodified pictures taken with a +non-distorting standard objektive. Stitched panorama pictures will not work! + + +Commercial Application +====================== + +If you are interested in a commercial application of the methods used in +gipfel, feel free to contact me. + + +Acknowledgements +================ + +Thanks to the guys from http://www.alpin-koordinaten.de for their public +GPS database. +Also have look at their other site http://www.alpen-panoramen.de/ ! +I also want to thank my brother Martin Hofmann for his tips and the +discussions. + + +DISCLAIMER +========== +gipfel must NOT be used for real navigation. You should not rely on the +results of gipfel. + + +Johannes Hofmann +(Johannes.Hofmann@gmx.de) +May 10, 2005 |