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## Copyright (C) 2014-2022 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 {Function File} {@var{status} =} shapewrite (@var{shpstr}, @var{fname})
## @deftypefnx {Function File} {@var{status} =} shapewrite (@var{shpstr}, @var{fname}, @var{atts})
## Write contents of map- or geostruct to a GIS shape file.
##
## @var{shpstr} must be a valid mapstruct or geostruct, a struct array with an
## entry for each shape feature, with fields Geometry, BoundingBox, and X and Y
## (mapstruct) or Lat and Lon (geostruct). For geostructs, Lat and Lon field
## data will be written as X and Y data. Field Geometry can have data values
## of "Point", "MultiPoint", "Line" or "Polygon", all case-insensitive.
## For each shape feature, field BoundingBox should contain the minimum and
## maximum (X,Y) coordinates in a 2x2 array [minX, minY; maxX, maxY].
## The X and Y fields should contain X (or Latitude) and Y (or Longitude)
## coordinates for each point or vertex as row vectors; for
## poly(lines) and polygons vertices of each subfeature (if present) should be
## separated by NaN entries.
##
## <Geometry>M or <Geometry>Z types (e.g., PointM, PolygonZ) can also be
## written; shapewrite.m just checks if fields "M" and/or "Z" are present in
## input mapstruct.
##
## @var{fname} should be a valid shape file name, optionally with a '.shp'
## suffix.
##
## Optional third input argument @var{atts} is one attribute name or a cellstr
## array containing a list of attribute names; only those attributes will be
## written to the .dbf file. Alternatively a struct can be supplied with
## attibute names contained in field "FieldName" (preferrably camelcased as
## shown, but Octave treats this field's name as case-insensitive). If
## argument @var{atts} is omitted all attributes will be written to the
## shapefile.
##
## shapewrite produces 3 files, i.e. a .shp file (the actual shape file),
## a .shx file (index file), and a .dbf file (dBase type 3) with the contents
## of additional attribute fields other than Geometry, X/Y or Lat/Lon, M, Z,
## and BoundingBox. If no additional attributes are present, a .dbf file is
## created with the shape feature numbers as contents of field "ID".
##
## Return argument @var{status} is set to 1 if the complete shape file set was
## written successfully, to 0 otherwise.
##
## Ref: http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
##
## @seealso{shapedraw, shapeinfo, shaperead}
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2014-12-30
function [status] = shapewrite (shp, fname="", atts=[])
persistent n_dbfspec = 0;
status = 0;
## Input validation
if (nargin < 1)
print_usage;
endif
## Assess shape variable type (oct or ml/geo ml/map)
if (! isstruct (shp))
error ("shapewrite: [map-, geo-] struct expected for argument #1");
else
## Yep. Find out what type
fldn = fieldnames (shp);
if (ismember ("vals", fldn) && ismember ("shpbox", fldn))
## Assume it is an Octave-style struct read by shaperead
otype = 0;
warning ("shapewrite: only Matlab-type map/geostructs can be written\n");
return;
elseif (ismember ("Geometry", fldn) && all (ismember ({"X", "Y"}, fldn)))
## Assume it is a Matlab-style mapstruct
otype = 1;
elseif (ismember ("Geometry", fldn) && all (ismember ({"Lat", "Lon"}, fldn)))
## Assume it is a Matlab-style geostruct
otype = 2;
else
## Not a supported struct type
error ("shapewrite: unsupported struct type.\n")
endif
endif
## FIXME struct field type validation
if (strcmpi (shp(1).Geometry, "MultiPatch"))
error ("shapewrite: MultiPatch type not supported");
endif
## Check for dbfwrite function
if (isempty (which ("dbfwrite")))
error (["shapewrite: dbfwrite function not found. (io package ", ...
"installed and loaded?)"]);
return;
endif
## Check file name
if (isempty (fname))
error ("shapewrite: filename expected for input argument #2");
else
[pth, fnm, ext] = fileparts (fname);
if (isempty (ext))
bname = fname;
fname = [fname ".shp"];
## Later on bname.shx and bname.dbf will be created
elseif (isempty (pth))
bname = fnm;
else
bname = [pth filesep fnm];
endif
endif
## Check optional 3rd argument
if (nargin > 2)
if (isstruct (atts))
if (! n_dbfspec)
warning (["shapewrite: DbfSpec not implemented; including ", ...
"requested attributes\n"]);
n_dbfspec = 1;
endif
## Get attribute names from field "FieldName"; allow lowercase and camelcase
## Index of case-insensitive matches of "FieldName"
fnidx = find (ismember ("fieldname", lower (fieldnames (atts))));
if (! isempty (fnidx))
## Get fieldnames out of first match
atts = {atts.(fieldnames (atts (fnidx)){1})};
else
warning (["shapewrite: no field 'fieldname' (case-insensitive) ", ...
"found in struct\n=> input arg. #3 ignored"]);
endif
elseif (! iscellstr (atts) && ! ischar (atts))
error (["shapewrite: arg.#3: attribute name or cellstr array of ", ...
"attribute names expected"]);
endif
## Check if requested attributes exist at all in shapestruct
atts = unique (atts);
mtch = ! ismember (atts, fieldnames (shp));
if (any (mtch))
warning ("shapewrite: requested attribute(s) '%s' not in shapestruct\n", ...
strjoin (atts(find (mtch)), "', '"));
atts(mtch) = [];
endif
endif
## Prepare a few things
numfeat = numel (shp);
if (abs (otype) >= 1)
stype = find (ismember ({"point", "multipoint", "line", "polygon"}, ...
lower (shp(1).Geometry)));
## strmatch (lower (shp(1).Geometry), ...
## {"point", "multipoint", "line", "polygon"});
if (isempty (stype))
## Not a supported struct type
error ("shapewrite: unsupported struct type.\n")
else
stype = [1, 8, 3, 5](stype);
endif
## Preprocess geostructs
if (abs (otype) == 2)
## Change Lat/Lon fields into X/Y
[shp.X] = deal (shp.Lon);
[shp.Y] = deal (shp.Lat);
endif
## "Point" need not have a BoundingBox field => add a dummy if not found
if (stype == 1 && ! ismember ("BoundingBox", fldn))
[shp.BoundingBox] = deal ([0, 0; 0, 0]);
endif
if (any (ismember ({"M", "Z"}, fldn)))
if (ismember ({"Z"}, fldn))
stype += 10;
else
stype += 20;
endif
otype = -otype;
endif
endif
## Only now (after input checks) open .shp and .shx files & rewind just to be sure
fids = fopen (fname, "w");
if (fids < 0)
error ("shapewrite: shapefile %s can't be opened for writing\n", fname);
endif
fseek (fids, 0, "bof");
fidx = fopen ([ bname ".shx" ], "w");
if (fidx < 0)
error ("shapewrite: index file %s can't be opened for writing\n", fname);
endif
fseek (fidx, 0, "bof");
## Write headers in .shp & .shx (identical). First magic number 9994 + six
## zeros, the last zero in .shp is a placeholder for the yet unknown .shp
## file length.
fwrite (fids, [9994 0 0 0 0 0 0], "int32", 0, "ieee-be");
fwrite (fidx, [9994 0 0 0 0 0], "int32", 0, "ieee-be");
## For .shx the file length in 16-bit words (single) is known:
fwrite (fidx, ((numfeat * 4) + 50), "int32", 0, "ieee-be");
## Next, shp file version
fwrite (fids, 1000, "int32");
fwrite (fidx, 1000, "int32");
## Shape feature type
fwrite (fids, stype, "int32");
fwrite (fidx, stype, "int32");
## Bounding box. Can be run later for ML type shape structs. Fill with zeros
fwrite (fids, [0 0 0 0 0 0 0 0], "double");
fwrite (fidx, [0 0 0 0 0 0 0 0], "double");
## Prepare BoundingBox limits
xMin = yMin = zMin = mMin = Inf;
xMax = yMax = zMax = mMax = -Inf;
## Skip to start of first record position
% fseek (fids, 100, "bof");
% fseek (fidx, 100, "bof");
## Write shape features one by one
if (abs (otype) >= 1)
for ishp=1:numfeat
## Write record start pos to .shx file
fwrite (fidx, ftell (fids) / 2, "int32", 0, "ieee-be");
## Prepare multipart polygons/lines.
## Find pointers to separators
idx = [ 0 find(isnan (shp(ishp).X)) ];
## Eliminate trailing NaN rows
if (isnan (shp(ishp).X))
idx(end) = [];
endif
## Augment idx for later on
idx = unique ([ idx (numel (shp(ishp).X)+1) ]);
## Remove NaN separators
idn = find (! isfinite (shp(ishp).X));
shp(ishp).X(idn) = [];
shp(ishp).Y(idn) = [];
if (stype >= 10)
shp(ishp).Z(idn) = [];
endif
if (stype >= 10)
shp(ishp).M(idn) = [];
## M as need not be present (we assume a NaN value then).
## Set M to a value less than -1e39
idm = find (! isfinite (shp(ishp).M));
shp(ishp).M(idm) = -1.1e39;
endif
## Nr. of vertices
npt = numel (shp(ishp).X);
## Pointers to parts
nptr = idx(1:end-1) - [0:numel(idx)-2];
## Write record contents
switch (stype)
case 1 ## Point
reclen = 10;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Simply write XY cordinates
fwrite (fids, [shp(ishp).X shp(ishp).Y], "double");
## Update overall BoundingBox
xMin = min (xMin, shp(ishp).X);
xMax = max (xMax, shp(ishp).X);
yMin = min (yMin, shp(ishp).Y);
yMax = max (yMax, shp(ishp).Y);
case 11 ## PointZ
reclen = 18;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Simply write XY coordinates & Z & M value
fwrite (fids, [shp(ishp).X shp(ishp).Y shp(ishp).Z shp(ishp).M], "double");
## Update overall BoundingBox
xMin = min (xMin, shp(ishp).X);
xMax = max (xMax, shp(ishp).X);
yMin = min (yMin, shp(ishp).Y);
yMax = max (yMax, shp(ishp).Y);
zMin = min (zMin, shp(ishp).Z);
zMax = max (zMax, shp(ishp).Z);
mMin = min (mMin, shp(ishp).M);
mMax = max (mMax, shp(ishp).M);
case 21 ## PointM
reclen = 14;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Simply write XY coordinates & M-value
fwrite (fids, [shp(ishp).X shp(ishp).Y shp(ishp).M], "double");
## Update overall BoundingBox
xMin = min (xMin, shp(ishp).X);
xMax = max (xMax, shp(ishp).X);
yMin = min (yMin, shp(ishp).Y);
yMax = max (yMax, shp(ishp).Y);
mMin = min (mMin, shp(ishp).M);
mMax = max (mMax, shp(ishp).M);
case 8 ## MultiPoint
reclen = (40 + 16 * numel (shp(ishp).X)) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type (+4)
fwrite (fids, stype, "int32");
## Write bounding box (+32 -> 36)
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
## Write nr of points and XY data (+4 -> 40 + Nx16)
fwrite (fids, numel (shp(ishp).X), "int32");
fwrite (fids, [shp(ishp).X' shp(ishp).Y']', "double");
case 18 ## MultiPointZ
reclen = (72 + 32 * numel (shp(ishp).X)) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Write bounding box
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
zMin = min (zMin, min (shp(ishp).Z));
zMax = max (zMax, max (shp(ishp).Z));
mMin = min (mMin, min (shp(ishp).M));
mMax = max (mMax, max (shp(ishp).M));
## Write Nr of points and XY data
fwrite (fids, numel (shp(ishp).X), "int32");
fwrite (fids, [shp(ishp).X' shp(ishp).Y']', "double");
## Write Z/M range and -data in turn
fwrite (fids, [min(shp(ishp).Z) max(shp(ishp).Z) shp(ishp).Z], "double");
fwrite (fids, [min(shp(ishp).M) max(shp(ishp).M) shp(ishp).M], "double");
case 28 ## MultiPointM
reclen = (56 + 24 * numel (shp(ishp).X)) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Write bounding box
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
mMin = min (mMin, min (shp(ishp).M));
mMax = max (mMax, max (shp(ishp).M));
## Write Nr of points and XY data
fwrite (fids, numel (shp(ishp).X), "int32");
fwrite (fids, [shp(ishp).X' shp(ishp).Y']', "double");
## Write M range and M data
fwrite (fids, [min(shp(ishp).M) max(shp(ishp).M) shp(ishp).M], "double");
case {3, 5} ## Polyline/-gon
## Content length
reclen = (44 + (numel(idx)-1)*4 + 2*8*npt) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Write bounding box
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
## Write number of parts, number of points, part pointers
fwrite (fids, [(numel(idx)-1) npt nptr ], "int32");
fwrite (fids, [shp(ishp).X' shp(ishp).Y']'(:), "double");
case {13, 15} ## Polyline/-gonZ
## Content length
reclen = (76 + (numel(idx)-1)*4 + 4*8*npt) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Shape type
fwrite (fids, stype, "int32");
## Write bounding box
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
zMin = min (zMin, min (shp(ishp).Z));
zMax = max (zMax, max (shp(ishp).Z));
mMin = min (mMin, min (shp(ishp).M));
mMax = max (mMax, max (shp(ishp).M));
## Write number of parts, number of points, part pointers
fwrite (fids, [(numel(idx)-1) npt nptr ], "int32");
## Write XY data
fwrite (fids, [shp(ishp).X' shp(ishp).Y']'(:), "double");
fwrite (fids, [min(shp(ishp).Z) max(shp(ishp).Z) ...
shp(ishp).Z], "double");
fwrite (fids, [min(shp(ishp).M) max(shp(ishp).M) ...
shp(ishp).M], "double");
case {23, 25} ## Polyline/-gonM
## Content length
reclen = (60 + (numel(idx)-1)*4 + 3*8*npt) / 2;
## Write record index number & content length (fixed)
fwrite (fids, [ishp reclen], "int32", 0, "ieee-be");
fwrite (fidx, reclen, "int32", 0, "ieee-be");
## Write shape type
fwrite (fids, stype, "int32");
## Write bounding box
fwrite (fids, [shp(ishp).BoundingBox'(:)]', "double");
## Update overall BoundingBox
xMin = min (xMin, min (shp(ishp).X));
xMax = max (xMax, max (shp(ishp).X));
yMin = min (yMin, min (shp(ishp).Y));
yMax = max (yMax, max (shp(ishp).Y));
mMin = min (mMin, min (shp(ishp).M));
mMax = max (mMax, max (shp(ishp).M));
## Write number of parts, number of points, part pointers
fwrite (fids, [(numel(idx)-1) npt nptr ], "int32");
## Write XY data
fwrite (fids, [shp(ishp).X' shp(ishp).Y']'(:), "double");
## Write M range and M data
fwrite (fids, [min(shp(ishp).M) max(shp(ishp).M) ...
shp(ishp).M], "double");
otherwise
## Future shape types or types unsupported yet (MultiPatch)
endswitch
endfor
endif
## Write file length and overall BoundingBox into .shp header
flen = ftell (fids);
fseek (fids, 24, "bof");
fwrite (fids, flen/2, "int32", 0, "ieee-be");
fseek (fids, 36, "bof");
fwrite (fids, [xMin yMin xMax yMax], "double");
## Same for .shx header
xlen = ftell (fidx);
fseek (fidx, 24, "bof");
fwrite (fidx, xlen/2, "int32", 0, "ieee-be");
fseek (fidx, 36, "bof");
fwrite (fidx, [xMin yMin xMax yMax], "double");
if (stype > 10)
## +-Inf & NaN not allowed in shapefiles
zm = [zMin zMax mMin mMax];
zm (! isfinite (zm)) = -1e-39;
fwrite (fids, zm, "double");
fwrite (fidx, zm, "double");
endif
## Close files
fclose (fids);
fclose (fidx);
## Write .dbf file.
## Remove basic attributes
if (abs (otype) == 1)
## Attributes + shp data in mapstruct
shp = rmfield (shp, {"Geometry", "BoundingBox", "X", "Y"});
elseif (abs (otype) == 2)
## Attributes + shp data in geostruct
shp = rmfield (shp, {"Geometry", "BoundingBox", "Lat", "Lon", "X", "Y"});
endif
if (otype < 1)
shp = rmfield (shp, {"M"});
if (isfield (shp, "Z"))
shp = rmfield (shp, {"Z"});
endif
endif
## Write rest of attributes
if (nargin == 3)
## Only write user-specified attribute selection
fldn = fieldnames (shp);
## First remove regular attributes (with a value for each vertex)
fldn (ismember (fldn, {"Geometry", "BoundingBox", "Lat", "Lon", "X", "Y", "M", "Z"})) = [];
## Next, only retain user-specified attributes
shp = rmfield (shp, setdiff (fldn, atts));
endif
attribs = cell (numfeat + 1, numel (fieldnames (shp)));
if (! isempty (attribs))
attribs(1, :) = fieldnames (shp);
attribs(2:end, :) = (squeeze (struct2cell (shp)))';
else
## Substitute ID attribute
attribs{1, 1} = "ID";
[attribs{2:end}] = deal (num2cell ([1:size(shp, 2)]){:});
endif
try
status = dbfwrite ([ bname ".dbf"], attribs);
status = 1;
catch
warning ("shapewrite: writing attributes to file %s failed\n", [bname ".dbf"]);
end_try_catch
endfunction
## Test various geometries: (1) Point
%!test
%! shp.Geometry = "Point";
%! shp.X = 10;
%! shp.Y = 20;
%! shp.Z = 30;
%! shp.M = -1;
%! shp.attr_1 = "Attribute1";
%! shp.attr_Z = "AttributeA";
%! shp(2).Geometry = "Point";
%! shp(2).X = 11;
%! shp(2).Y = 25;
%! shp(2).Z = 32;
%! shp(2).M = -2;
%! shp(2).attr_1 = "Attribute2";
%! shp(2).attr_Z = "AttributeB";
%! fname = tempname ();
%! sts = shapewrite (shp, fname);
%! assert (sts, 1, eps);
%! ## Check index file
%%! fx = fopen ([fname ".shx"], "r");
%%! fseek (fx, 100, "bof");
%%! shxinfo = fread (fx, "*int32", 0, "ieee-be");
%%! assert (shxinfo, int32 ([50; 36; 72; 36]));
%%! fclose (fx);
%! ## Check on filesizes, based on Esri shapewrite doc
%! assert (stat ([fname ".shp"]).size, 188, 1e-10);
%! assert (stat ([fname ".shx"]).size, 116, 1e-10);
%! shp2 = shaperead ([fname ".shp"]);
%! assert (size (shp2), [2 1]);
%! flds = fieldnames (shp2);
%! fields = {"Geometry", "X", "Y", "attr_1", "attr_Z"};
%! ism = ismember (fields, flds);
%! ## Do we have only those fields?
%! assert (numel (ism), numel (fields));
%! ## Do we have only those fields?
%! assert (sum (ism), numel (ism));
%! unlink ([fname ".shp"]);
%! unlink ([fname ".shx"]);
%! assert ([shp2.X shp2.Y], [10 11 20 25], 1e-10);
%! assert ({shp2.Geometry}, {"Point", "Point"});
%! assert ({shp2.attr_1}, {"Attribute1", "Attribute2"});
## Test various geometries: (2) Line & Polygon
%!test
%! shp.Geometry = "Line";
%! shp.BoundingBox = [9 110; 19 120];
%! shp.X = [10 110 NaN 9 109];
%! shp.Y = [20 120 NaN 19 119];
%! shp.Z = [30 130 NaN 29 129];
%! shp.M = [-1 1 NaN -11 11];
%! shp.attr_1 = "Attribute1";
%! shp.attr_Z = "AttributeA";
%! shp(2).Geometry = "Line";
%! shp(2).BoundingBox = [11 211; 24 225];
%! shp(2).X = [11 111 211 NaN 11 110 NaN 12 200];
%! shp(2).Y = [25 125 225 NaN 24 124 NaN 26 200];
%! shp(2).Z = [32 132 232 NaN 31 131 NaN 33 200];
%! shp(2).M = [-2 NaN -3 NaN -22 22 NaN -33 33];
%! shp(2).attr_1 = "Attribute2";
%! shp(2).attr_Z = "AttributeB";
%! fname = tempname ();
%! sts = shapewrite (shp, fname);
%! assert (sts, 1, eps);
%! ## Check index file
%%! fx = fopen ([fname ".shx"], "r");
%%! fseek (fx, 100, "bof");
%%! shxinfo = fread (fx, "*int32", 0, "ieee-be");
%%! assert (shxinfo, int32 ([50; 106; 160; 156]));
%%! fclose (fx);
%! ## Check on filesizes, based on Esri shapewrite doc
%! assert (stat ([fname ".shp"]).size, 640, 1e-10);
%! assert (stat ([fname ".shx"]).size, 116, 1e-10);
%!
%! ## Check Matlab-style reading
%! shp2 = shaperead ([fname ".shp"]);
%! assert (size (shp2), [2 1]);
%! flds = fieldnames (shp2);
%! fields = {"Geometry", "BoundingBox", "X", "Y", "attr_1", "attr_Z"};
%! ism = ismember (fields, flds);
%! ## Do we have only those fields?
%! assert (numel (ism), numel (fields));
%! ## Do we have only those fields?
%! assert (sum (ism), numel (ism));
%! assert ([shp2.BoundingBox], [9 110 11 211; 19 120 24 225], 1e-10);
%! assert ({shp2.attr_Z}, {"AttributeA", "AttributeB"});
%!
%! ## Re-read using M & Z values, read only 2nd feature
%! shp2 = shaperead ([fname ".shp"], "e", "rec", 2);
%! assert (size (shp2), [1 1]);
%! flds = fieldnames (shp2);
%! fields = {"Geometry", "BoundingBox", "X", "Y", "Z", "M", "attr_1", "attr_Z"};
%! ism = ismember (fields, flds);
%! ## Do we have only those fields?
%! assert (numel (ism), numel (fields));
%! ## Do we have only those fields?
%! assert (sum (ism), numel (ism));
%! ## Check regular numerical values
%! assert ([shp2.X; shp2.Y; shp2.Z], ...
%! [11, 111, 211, NaN, 11, 110, NaN, 12, 200; ...
%! 25, 125, 225, NaN, 24, 124, NaN, 26, 200; ...
%! 32, 132, 232, NaN, 31, 131, NaN, 33, 200], 1e-10);
%! ## Check missing M value
%! assert (shp2.M, [-2, NaN, -3, NaN, -22, 22, NaN, -33, 33], 1e-10);
%! assert ({shp2.attr_1, shp2.attr_Z}, {"Attribute2", "AttributeB"});
%!
%! unlink ([fname ".shp"]);
%! unlink ([fname ".shx"]);
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