![]() | ![]() | ![]() | The geopicts Command |
The geopicts command geo-references files (e.g., picture files
from a digital camera) either based on their time-stamps and a given
track, or by using the sequence of waypoints in a group. The result is
a file with waypoints (at present in GPX format) that can be suitable
for use with World Wide Web applications.
geopicts IN-FORMAT [IN-PARAMS] IN-TYPE IN-PATH [PROC-PARAMS] \ [OUT-FORMAT] [OUT-PARAMS] OUT-PATH PICT-PATHSwhere
IN-FORMAT [IN-PARAMS]
and IN-PATH
are the input
file format, its parameters (if any) and path; use show
formats for a list of the currently accepted formats;
IN-TYPE
is the data type to read; the possible types
are
TR
, a track: the time-stamp of each file is compared
with the track points time-stamps and a position is computed by
linear interpolation/extrapolation; strange results can be
caused by track points being widely apart in distance or time;
GR
, a group: the files are sorted by their
time-stamps in increasing order and each file is put into
correspondence with a waypoint in the group in the order they
appear there, undefined waypoints being discarded; if there are
more files than waypoints, the last waypoint is used for the
remaining files;
PROC-PARAMS
, the processing parameters can be
id=ID
gives the name or identifier number of the item
to be used from the input file; if not given the last item of
IN-TYPE
that was read in is used;
date=DMODE
describes how file time-stamps should be
retrieved, DMODE
being
pict
(the default): the file is a picture file, the
time-stamp should be got from the EXIF tags in the file; the
following methods will be tried in sequence: using the Tcl
exif
package, running the exif
or the
metacam
external utilities; if all of them fail, the
file is discarded;
fmod
: the file last modification time as given by
the operating system is taken as time-stamp;
OUT-FORMAT
and OUT-PATH
are the output file
format and path; at present the only supported format is
GPX
;
OUT-PARAMS
are the parameters for OUT-FORMAT
but
may also contain the following ones used when generating the
resulting waypoints
datum=DATUM
;
sy=SYMBOL
, with SYMBOL
the internal name of
the symbol; use show symbols for a list
of the symbol names;
prefix=STRING
gives the prefix of the waypoint names,
the default being P
; each name starts with the prefix and
is followed by a 5 digit number;
PICT-PATHS
are the paths to the files to be geo-referenced.
A file with a time-stamp already found will be discarded.
mig_at_ncc.up.pt
, LIACC & DCC Faculdade de Ciências, Universidade do Porto![]() | ![]() | ![]() | The geopicts Command |