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## Copyright (C) 2018-2022 Philip Nienhuis
##
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see
## <https://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{kml} =} kmlread (@var{fname})
## (EXPERIMENTAL) Read a Google kml file and return its contents in a struct.
##
## @var{name} is the name of a .kml file.
## Currently kmlread can read Point, LineString, Polygon, Track and Multitrack
## entries.
##
## @var{kml} is a struct with fields Type, Lat, Lon, Ele, Time and Name. If
## the .kml file contained LineStrings and/or Polygons also field BoundingBox
## is present containing suitable values for the relevant items.
##
## @seealso{kmzread}
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2018-05-03
function outp = kmlread (fname)
fid = fopen (fname, "r");
if (fid > 0)
xml = fread (fid, Inf, "*char")';
fclose (fid);
else
error ("kmlread: couldn't read %s", fname);
endif
outp = repmat (struct ("Type", "-", ...
"Lat", [], ...
"Lon", [], ...
"Ele", [], ...
"Time", [], ...
"Name", "-"), 0, 1);
## Points
is = 1;
ipt = 0;
while (is > 0)
[pnt, il, is] = getxmlnode (xml, "Point", is, 1);
if (is > 0)
outp(end+1).Type = "Point";
++ipt;
pnam = regexp (xml(max (1, il - 1000):il+7), ...
'<Placemark.*?>.*?<name>(.+?)</name>.*?<Point', "tokens");
if (! isempty (pnam))
pname = cell2mat (pnam){end};
outp(end).Name = pname;
else
outp(end).Name = ["Point #" num2str(ipt)];
endif
coords = strrep (getxmlnode (pnt, "coordinates", 1, 1), ",", " ");
xyz = sscanf (coords, "%f", Inf);
outp(end).Lon = xyz(1);
outp(end).Lat = xyz(2);
if (numel (xyz) == 3)
outp(end).Ele = xyz(3);
endif
endif
endwhile
## Linestrings / Polylines
is = 1;
iln = 0;
while (is > 0)
[lin, il, is] = getxmlnode (xml, "LineString", is, 1);
if (is > 0)
outp(end+1).Type = "Line";
++iln;
lnam = regexp (xml(max (1, il - 1000):il+12), ...
'<Placemark.*?>.*?<name>(.+?)</name>.*?<LineString', "tokens");
if (! isempty (lnam))
lnam = cell2mat (lnam){end};
outp(end).Name = lnam;
else
outp(end).Name = ["Line #" num2str(iln)];
endif
coords = getxmlnode (lin, "coordinates", 1, 1);
## Check if we have Ele (Z). Coordinate tuples are separated by spaces
lines = strsplit (strtrim (coords), {" ", "\n"});
nd = numel (strfind (lines{1}, ",")) + 1;
xyz = reshape (sscanf (strrep (coords, ",", " "), "%f", Inf)', nd, [])';
outp(end).Lon = xyz(:, 1);
outp(end).Lat = xyz(:, 2);
outp(end).BoundingBox = [min(outp(end).Lon), max(outp(end).Lon); ...
min(outp(end).Lat), max(outp(end).Lat)];
if (nd > 2)
outp(end).Ele = xyz(:, 3);
outp(end).BoundingBox = [outp(end).BoundingBox;
min(outp(end).Ele), max(outp(end).Ele)];
else
outp(end).BoundingBox = [outp(end).BoundingBox;
NaN, NaN];
endif
endif
endwhile
## Polygons
is = 1;
ip = 0;
while (is > 0)
[pol, il, is] = getxmlnode (xml, "Polygon", is, 1);
if (is > 0)
outp(end+1).Type = "Polygon";
++ip;
pnam = regexp (xml(max (1, il - 1000):il+12), ...
'<Placemark.*?>.*?<name>(.+?)</name>.*?<Polygon', "tokens");
if (! isempty (pnam))
pnam = cell2mat (pnam){end};
outp(end).Name = pnam;
else
outp(end).Name = ["Polygon #" num2str (ip)];
endif
ir = 1;
## First get outer ring
[ring, ~, ir] = getxmlnode (pol, "outerBoundaryIs", ir);
coords = strrep (getxmlnode (ring, "coordinates", 1, 1), ",", " ");
xyz = reshape (sscanf (coords, "%f", Inf)', 3, [])';
## FIXME check on CCW
outp(end).Lon = xyz(:, 1);
outp(end).Lat = xyz(:, 2);
outp(end).Ele = xyz(:, 3);
## Next, any inner rings
while (ir > 0)
[ring, ~, ir] = getxmlnode (pol, "innerBoundaryIs", ir);
if (ir > 0)
coords = strrep (getxmlnode (ring, "coordinates", 1, 1), ",", " ");
xyz = reshape (sscanf (coords, "%f", Inf)', 3, [])';
## FIXME check on CW
outp(end).Lon = [outp(end).Lon; NaN; xyz(:, 1)];
outp(end).Lat = [outp(end).Lat; NaN; xyz(:, 2)];
outp(end).Ele = [outp(end).Ele; NaN; xyz(:, 3)];
endif
endwhile
outp(end).BoundingBox = [min(outp(end).Lon), max(outp(end).Lon); ...
min(outp(end).Lat), max(outp(end).Lat); ...
min(outp(end).Ele), max(outp(end).Ele)];
endif
endwhile
## Tracks and MultiTracks
ptrnT = '<when>(.*?)</when>';
is = em = 1;
it = 0;
while (is > 0)
if (em <= is)
## Try to get extent of multiTrack node
[mtrk, ~, em] = getxmlnode (xml, "gx:MultiTrack", is, 1);
if (em > 0)
## Get specific attributes for this Multitrack
mtid = getxmlattv (mtrk, "id");
intpm = str2double (getxmlnode (mtrk, "gx:interpolate", 10, 1));
## MultiTrack; start new struct item for next tracks
outp(end+1).Type = "Track";
++it;
if (isempty (mtid))
outp(end).Name = ["Track #" num2str(it)];
else
outp(end).Name = mtid;
endif
endif
endif
[trk, ~, is] = getxmlnode (xml, "gx:Track", is, 1);
if (is > 0)
if (! em)
## Separate track; start new struct item
outp(end+1).Type = "Track";
++it;
tnam = getxmlattv (trk, "id");
if (isempty (tnam))
outp(end).Name = ["Track #" num2str(it)];
else
outp(end) = tnam;
endif
outp(end).BoundingBox = [min(outp(end).Lon), max(outp(end).Lon); ...
min(outp(end).Lat), max(outp(end).Lat); ...
min(outp(end).Ele), max(outp(end).Ele)];
endif
times = cell2mat (regexp (trk, ptrnT, "tokens"));
ltime = cellfun ("numel", times);
if (any (ltime < 20))
## Year resolution
times(ltime == 4) = ...
cellfun (@(x) [x "-00-00T00:00:00Z"], times(ltime == 4), "uni", 0);
## Month resolution
times(ltime == 7) = ...
cellfun (@(x) [x "-00T00:00:00Z"], times(ltime == 7), "uni", 0);
## Day resolution
times(ltime == 10) = ...
cellfun (@(x) [x "T00:00:00Z"], times(ltime == 10), "uni", 0);
endif
times = datenum (times, "yyyy-mm-ddTHH:MM:SSZ");
ptrnP = '<gx:coord>(.+?) (.+?) (.+?)</gx:coord>';
xyz = reshape (str2double (cell2mat (regexp (trk, ptrnP, "tokens"))), 3, [])';
if (isempty (outp(end).Lat))
outp(end).Lon = xyz(:, 1);
outp(end).Lat = xyz(:, 2);
outp(end).Ele = xyz(:, 3);
if (! isempty (times))
outp(end).Time = times;
endif
elseif (intpm)
outp(end).Lon = [outp(end).Lon; xyz(:, 1)];
outp(end).Lat = [outp(end).Lat; xyz(:, 2)];
outp(end).Ele = [outp(end).Ele; xyz(:, 3)];
if (! isempty (times))
outp(end).Time = [outp(end).Time; times];
endif
else
outp(end).Lon = [outp(end).Lon; NaN; xyz(:, 1)];
outp(end).Lat = [outp(end).Lat; NaN; xyz(:, 2)];
outp(end).Ele = [outp(end).Ele; NaN; xyz(:, 3)];
if (! isempty (times))
outp(end).Time = [outp(end).Time; NaN; times];
endif
endif
outp(end).BoundingBox = [min(outp(end).Lon), max(outp(end).Lon); ...
min(outp(end).Lat), max(outp(end).Lat); ...
min(outp(end).Ele), max(outp(end).Ele)];
endif
endwhile
endfunction
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