Package: gpscorrelate Version: 1.5.6-1+b1 Severity: wishlist Hello,
Thanks for maintaining gpscorrelate. There is an interesting technique used by OpenStreetMap people to compute the time difference between EXIF time and GPS time, and then geocorrelate images: (from http://wiki.openstreetmap.org/index.php/JOSM) * Automatically Matching Photos to GPS traces One of the problems when out mapping with a GPS is trying to keep accurate notes about the street names as you pass each junction. If you have a digital camera to take out with you, JOSM can help. * take a photo of your GPS screen/display showing the time (on the GPS) when you start As you are travelling around, take a picture at appropriate places/junctions/road signs. Then, when you get home with your completed GPS track uploaded into JOSM: * In the "Layers" box, top right [...] * Right click the photos layer, * Sync the clocks using the (camera's timestamp on the) photo you took at the start (of the GPS screen/display clock) o If you do not have a picture of the GPS for some reason, turn on the camera and GPS now. Work out the time difference between them. Now, subtract or add this to the time shown in the 'sync clocks' photo dialog. This technique can be useless without bothering to set the camera time to anything meaningful, and the synchronisation can even be done afterwards, still by just taking a picture of the GPS time and computing the offset between the time in the picture and the time in the EXIF of the picture. To bring this into gpscorrelate, you would basically have a commandline switch to point to a 'reference' image (the picture of the time) and another switch to specify the time that you can read in the reference image. Subtract the two and you have the precise time offset between the camera and the gps, with one second accuracy, foolproof, regardless of timezones or anything. In the GUI it's even easier as you can just show the image and a text field to type the time. Only, if done in the GUI it's quite important to be able to zoom in some part of the image, because sometimes the GPS time in the picture only gets readable after some enlarging. Ciao, Enrico -- System Information: Debian Release: lenny/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 2.6.22-3-amd64 (SMP w/2 CPU cores) Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages gpscorrelate depends on: ii libc6 2.7-6 GNU C Library: Shared libraries ii libexiv2-2 0.16-3 EXIF/IPTC metadata manipulation li ii libgcc1 1:4.3.0-1 GCC support library ii libstdc++6 4.3.0-1 The GNU Standard C++ Library v3 ii libxml2 2.6.31.dfsg-2 GNOME XML library gpscorrelate recommends no packages. -- no debconf information -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
