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-gipfel
-======
-
-[homepage](http://www.flpsed.org/gipfel.html)
-
-Description
------------
-__gipfel__ helps 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.
-gipfel can also be used to play around with the parameters manually.
-But it's pretty difficult to find the right parameters for a given
-picture manually.  
-You can think of gipfel as a georeferencing software for arbitrary images
-(not only satelite images or maps).  
-gipfel also has an image stitching mode, which allows to generate
-panorama images from multiple images that have been referenced with gipfel.
-The nice thing about image stitching is that it reuses the code that
-already exists for referencing images.  
-gipfel uses the non-linear
-[least squares method](http://en.wikipedia.org/wiki/Least_squares) to
-compute the viewing paramteres from the given data points.
-
-Requirements
-------------
-* [fltk-1.x.x](http://www.fltk.org)
-* [libtiff](http://www.remotesensing.org/libtiff/)
-* [libjpeg](http://www.ijg.org/)
-* [exiv2](http://www.exiv2.org/)
-* [GSL - GNU Scientific Library](http://www.gnu.org/software/gsl/)
-* gipfel works on UNIX-like systems (e.g. Linux, *BSD and probably others)
-
-Installation
-------------
-Unpack the tar file and run `./configure; make; make install`
-
-Running
--------
-To start gipfel, enter 
-
-	gipfel <image>
-
-where <image> is the actual picture in JPEG format.
-
-You should now see a control window and the actual picture.
-Additionally a "Choose Viewpoint" window should pop up, where you can search
-for the viewpoint from which the picture was taken. Select a viewpoint and 
-click "Ok".
-Alternatively, you can enter the GPS coordinate of the viewpoint directly in
-the control window (hit <Enter> for every data field).  
-You can now use the controls in the control window to modify the view
-parameters. These are:
-* View direction
-* Nick angle
-* Tilt angle
-* Focal Length
-* Visibility
-
-Play around with these parameters, until you see the names of 
-mountains, which you already recognize on the picture.
-Now middle-click on the small cross at the left of the name to mark it.
-It should turn red. Now you can drag it with the left mouse button pressed
-to the position of the mountain on the picture.
-If you have positioned at least two mountains all other mountains should
-move to their correct positions in the picture.
-You can try to set more than two mountains to ge a more accurate result.
-
-You may also want to have a look at the (outdated)
-(screen video)[http://www.flpsed.org/images/gipfel.avi]
-for an example session.
-
-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".
-
-Obviously you can easily add your own entries to the data file or add them
-to the database at http://www.alpin-koordinaten.de.
-
-Thanks to the kind permission of
-[Jonathan de Ferranti](http://www.viewfinderpanoramas.org/) and the
-creators of http://www.alpin-koordinaten.de, the standard gipfel
-tarball includes a default datafile generated from these two sources.
-
-For the USA, you can download a data file
-from [USGS](http://geonames.usgs.gov/domestic/download_data.htm)
-The file can be transformed for gipfel with
-	awk 'BEGIN {FS="|"; OFS=","};
-	     $3 == "Summit" {print "usgs_" $1, $2,"" , $10, $11, $16};'
-
-GPS Tracks
-----------
-Once you have determined the right parameters using the procedure described
-above, you can load GPS tracks and display them on the picture. Use the
-File->Load Track menu item. GPS tracks should be text files containing
-one line per waypoint. Each line should be of the form:
-
-<LATITUDE>,<LONGITUDE>,<HEIGHT>
-
-GPS tracks are displayed with variable width depending on the distance 
-of the way points from the current view point and the scale value. 
-You can also modify the width using the "Track Width" slider.
-
-Loading and Saving Images
--------------------------
-gipfel allows to save the image paramters in the comment section of 
-the JPEG image. Use the File->Save Image menu item. 
-Note, that in the saved image all previous JPEG comments are removed.
-If you open an image containing gipfel image parameters, they are 
-automatcally set.
-
-Hidden Object Detection
------------------------
-gipfel tries to identify objects in its database, that are hidden by others.
-This is done by assuming that every object/peak has the form of a cone 
-with a fixed steepness. If such imaginary cone would hide the view to a
-point in the database, gipfel marks it as hidden. Hidden objects are
-not shown by default, but you can enable the display of hidden objects using
-the Option->Show Hidden menu entry. Hidden objects and hidden GPS way points
-are displayed in blue.
-
-Refraction
-----------
-Refraction caused by temperature and density gardients in the atmosphere is
-taken into account according to the approximation described by
-[Tom Chester](http://tchester.org/sgm/analysis/peaks/refraction_calculation.html).
-under the assumption of a temperature change of 6.5C per 1000m and a
-temperature T0 at view point level of 10C.
-
-Exif Data
----------
-gipfel tries to get useful information from the exif data of the
-input image. It uses the "Focal Length in 35mm Film" and the 
-"GPS Longitude", "GPS Latitude", and "GPS Height" parameters, if they
-exist.
-
-Lens Distortion
----------------
-Typical lenses especially wide-angle lenses diverge from the optimal
-rectilinear projection.
-gipfel can now partly correct the resulting errors.
-To this end gipfel uses a standard distortion model with three parameters 
-(k0, k1, and x0). Depending on these values, the distance d of an image
-point from the center is modified by (k0 * d + k1 * d ^ 2).
-x0 is the main point offset in X direction.  
-
-If you mark and position more than 3 mountains on an image, gipfel
-tries to correct lens distortion. You can see that the flags turn
-green in this case.
-Once you have reasonable values for k0 and k1 for a special camera and
-focal length you can save the distortion profile (Distortion/Save Profile).
-Whenever you now open an image taken with this camera model and focal
-length, gipfel will use this distortion profile.
-The distortion profiles are stored in the 
-	$HOME/.fltk/Johannes.HofmannATgmx.de/gipfel
-directory and can also be edited manually.
-Independent of the distortion profiles one can also modify the
-distortion parameters per image.
-Distortion correction is also used when stitching panorama images.
-
-Stitching Panorama Images
--------------------------
-If you have multiple images from the same viewpoint referenced with gipfel
-you can stitch them together to form a panorama image.
-For stitching the input images must all have been correctly referenced
-with gipfel and saved (see "Loading and Saving Images").
-You can then call
-        gipfel -s <img1> <img2> ...
-to see the result in a window. Alternatively you can call
-        gipfel -s -j <outimg> <img1> <img2> ...
-to save the result as a JPEG image to <outimg> or
-        gipfel -s -t <outimg> <img1> <img2> ...
-to save the result as TIFF image.
-To get multiple TIFF images as input for
-<http://enblend.sourceforge.net/>, call gipfel like this:
-	for i in *.jpg; do gipfel -s -b -t tiff/$i $i; done
-
-The width and height of the result images can be adjusted with
-additional -w and -h options.
-You can use the -b switch to enable bicubic interpolation, which
-gives smoother results but is a bit slower.  
-
-gipfel simply scans all directions needed for the panorama and determines
-where these directions would end up on the various pictures. It can then
-record the corresponding color values from the input images.  
-
-In contrast to other stitching programs, the input images don't need to
-overlap.
-
-If you want to open a stitched image in gipfel to locate the mountains
-on it, don't forget to choose Panoramic Projection!
-
-Troubleshooting
----------------
-* Obviously gipfel can only be as good as its input data. If there is no 
-  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. If you have a panorama picture, you
-  might want to try the "Panoramic Projection" support which 
-  imlements a cylindrical projection (see "Projection" menu).
-* I don't know, whether gipfel currently works correctly on pictures taken on
-  the southern hemisphere, but I would appreciate any feedback about it.
-
-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).
-In newer versions I use [maxima](http://maxima.sourceforge.net/) for
-symbolic computation and code generation.
-I also want to thank my brother Martin for his suggestions 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>
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