1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
## Copyright (C) 2017-2022 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 <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{gml} =} gmlread (@var{fname}, @var{dots})
## Read a .gml (Geographic Markup Language) file.
##
## gmlread only reads coordinates, no attributes.
##
## Required input argument @var{fname} is the name of a .gml file. If
## no other arguments are specified all features in the entire .gml file
## will be read.
##
## The following optional property/value pairs (all case-insensitive)
## can be specified to select only some feature types and/or features
## limited to a certain area:
##
## @itemize
## @item "FeatureType"
## (Just one "f" will do) Only read a certain feature type; the value
## can be one of "Points", "LineStrings" or "Polygons" (only the first
## three characters matter). Multiple feature types can be selected by
## specifying multiple FeatureType property/value pairs.
##
## @item BoundingBox
## (just one "b" suffices) Only read features that lie entirely within
## a coordinate rectangle specified as a 2x2 matrix containing [minX minY;
## maxX maxY].
## @end itemize
##
## In addition verbose output can be obtained by specifying the following
## property/value pair:
##
## @itemize
## @item Debug
## (a "d" will do) followed by a numeric value of 1 (or true) specifies
## verbose output; a numeric value of 0 (or false) suppresses verbose output.
## @end itemize
##
## The output of gmlread comprises a struct containing up to three
## mapstructs (MultiPoint and/or Polyline and/or Polygon mapstructs),
## depending on optional featuretype selection.
##
## @seealso{shaperead}
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2017-03-06
function [gml] = gmlread (fname, varargin)
## FIXME Input validation
fid = fopen (fname, "r");
if (fid < 0)
error ("gmlread: file %s not found.\n", fname);
endif
## Process [property, value] options
idx = pol = [];
dbug = feat = ipt = iln = ipg = 0;
for ii=1:2:numel (varargin)
if (ischar (varargin{ii}) && numel (varargin{ii}) > 0 && mod (numel (varargin), 2) == 0)
switch lower (varargin{ii})(1)
case "f"
## Feature type. Keep track of whether this option was entered
feat = 1;
if (ischar (varargin{ii+1}))
switch lower (varargin{ii+1})(1:3)
case "poi"
ipt = 1;
case "lin"
iln = 1;
case "pol"
ipg = 1;
otherwise
error ("gmlread: unknown FeatureType '%s'", varargin{ii+1});
endswitch
else
error ("gmlread: illegal value for argument %d\n", ii+1);
endif
case "b"
## Bounding box
bbox = varargin{ii+1};
if (! isnumeric (idx) && size (bbox, 1) != 2 && size (bbox, 2) != 2)
error ("gmlread: numeric 2x2 matrix expected for arg.# %d\n", ii+1);
else
pol = [bbox(1, 1), bbox(2, 1), bbox(2, 1), bbox(1, 1), bbox(1, 1); ...
bbox(1, 2), bbox(1, 2), bbox(2, 2), bbox(2, 2), bbox(1, 2)];
endif
case ("d")
## Debug
dbug = varargin{ii+1} == 1;
otherwise
warning ("gmlread: unknown option '%s' - ignored\n", varargin{ii});
endswitch
else
error ("gmlread: wrong [property, value] options list");
endif
endfor
if (! feat)
ipt = iln = ipg = 1;
endif
if (dbug)
printf ("Reading %s ... ", fname);
endif
xml = fread (fid, 1000, "char=>char")';
## Skip header lines/-nodes
hdls = cell2mat (regexp (xml, '(<\?.*?\?>)|(<!.*?>)', "tokenExtents"));
spos = hdls(end);
## Start with outer content node
fseek (fid, spos+1, "bof");
xml = fread (fid, Inf, "char=>char")';
fclose (fid);
## Parse xml int 5xN cell array
ptrn = '<gml:((Point|LineString|Polygon)) .*?<gml:(coordinates|posList|pos).*?srsDimension="(\d)".*?>([\d\. ]*?)</gml:(coordinates|posList|pos)>';
feats = reshape (cell2mat (regexp (xml, ptrn, "tokens")), 5, []);
if (ipt)
if (dbug)
printf ("\nSearching Points ... ");
endif
ipt = find (strcmp (feats(1, :), "Point"));
if (dbug)
printf ("%d found.\n", numel (ipt));
endif
else
ipt = [];
endif
if (iln)
if (dbug)
printf ("Searching LineStrings ... ");
endif
iln = find (strcmp (feats(1, :), "LineString"));
if (dbug)
printf ("%d found.\n", numel (iln));
endif
else
iln = [];
endif
if (ipg)
if (dbug)
printf ("Searching Polygons ... ");
endif
ipg = find (strcmp (feats(1, :), "Polygon"));
if (dbug)
printf ("%d found.\n", numel (ipg));
endif
else
ipg = [];
endif
if (dbug)
printf ("Converting ....\n", numel (ipg));
endif
## Points
if (! isempty (ipt))
gmlpt = repmat (struct ("Geometry", "Multipoint", "X", NaN (1, 10), "Y",
NaN (1, 10), "BoundingBox", NaN (2, 2)), numel (ipt), 1);
jpt = 0;
for ii=1:numel (ipt)
if (dbug)
printf ("%d of %d Points ....\r", ii, numel (ipt));
endif
[xy, cnt] = sscanf (feats{4, ipt(ii)}, "%f");
dimsn = str2double (feats{3, ipt(ii)});
xy = reshape (xy, dimsn, []);
if (isempty (pol) || bbox <= 0 || all (inpolygon (xy(1, :), xy(2, :), pol(1, :), pol(2, :))))
++jpt;
gmlpt(jpt).X = xy(1, :);
gmlpt(jpt).Y = xy(2, :);
gmlpt(jpt).BoundingBox = [min(xy(1, :)), min(xy(2, :)); max(xy(1, :)), max(xy(2, :))];
if (dimsn >= 3)
gmlpt(jpt).Z = xy(3, :);
gmlpt(jpt).BoundingBox = [gmlpt(jpt).BoundingBox, [min(xy(3, :)); max(xy(3, :))]];
endif
endif
endfor
if (dbug)
printf ("\n");
endif
gml.Points = gmlpt(1:jpt);
endif
## LineStrings
if (! isempty (iln))
jpt = 0;
gmlpl = repmat (struct ("Geometry", "Polyline", "X", NaN (1, 15), "Y",
NaN (1, 15), "BoundingBox", NaN (2, 2)), numel (iln), 1);
for ii=1:numel (iln)
if (dbug)
printf ("%d of %d LineStrings ....\r", ii, numel (iln));
endif
[xy, cnt] = sscanf (feats{4, iln(ii)}, "%f");
dimsn = str2double (feats{3, iln(ii)});
xy = reshape (xy, dimsn, []);
if (isempty (pol) || all (inpolygon (xy(1, :), xy(2, :), pol(1, :), pol(2, :))))
++jpt;
gmlpl(jpt).X = xy(1, :);
gmlpl(jpt).Y = xy(2, :);
gmlpl(jpt).BoundingBox = [min(xy(1, :)), min(xy(2, :)); max(xy(1, :)), max(xy(2, :))];
if (dimsn >= 3)
gmlpl(jpt).Z = xy(3, :);
gmlpl(jpt).BoundingBox = [gmlpl(jpt).BoundingBox, [min(xy(3, :)); max(xy(3, :))]];
endif
endif
endfor
if (dbug)
printf ("\n");
endif
gml.Polylines = gmlpl(1:jpt);
endif
## Polygons
if (! isempty (ipg))
jpt = 0;
gmlpg = repmat (struct ("Geometry", "Polygon", "X", NaN (1, 20), "Y",
NaN (1, 20), "BoundingBox", NaN (2, 2)), numel (ipg), 1);
for ii=1:numel (ipg)
if (dbug)
printf ("%d of %d Polygons ....\r", ii, numel (ipg));
endif
[xy, cnt] = sscanf (feats{4, ipg(ii)}, "%f");
dimsn = str2double (feats{3, ipg(ii)});
xy = reshape (xy, dimsn, []);
if (isempty (pol) || all (inpolygon (xy(1, :), xy(2, :), pol(1, :), pol(2, :))))
++jpt;
gmlpg(jpt).X = xy(1, :);
gmlpg(jpt).Y = xy(2, :);
gmlpg(jpt).BoundingBox = [min(xy(1, :)), min(xy(2, :)); max(xy(1, :)), max(xy(2, :))];
if (dimsn >= 3)
gmlpg(jpt).Z = xy(3, :);
gmlpg(jpt).BoundingBox = [gmlpg(jpt).BoundingBox, [min(xy(3, :)); max(xy(3, :))]];
endif
endif
endfor
if (dbug)
printf ("\n");
endif
gml.Polygons = gmlpg(1:jpt);
endif
endfunction
|
