[Octave-bug-tracker] [bug #57669] [octave forge](mapping/io) Corrupt output when a single record is written with shapewrite

[Matthew Parkan]

URL:
  <https://savannah.gnu.org/bugs/?57669>

                 Summary: [octave forge](mapping/io) Corrupt output when a
single record is written with shapewrite
                 Project: GNU Octave
            Submitted by: mparkan
            Submitted on: dim. 26 janv. 2020 18:08:41 UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Matt Parkan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.90
        Operating System: Microsoft Windows

    _______________________________________________________

Details:

Hi,

There seems to be an issue with the output of the shapewrite function in the
mapping package (latest snapshot files from Jan 26, 2020): when a single
record is written to a shapefile, the result does not contain any of the
attributes.

Example:


s = struct;
j = 1;
s(j).Geometry = 'Point';
s(j).X = 597600;
s(j).Y = 172250;
s(j).BoundingBox = [min(s(j).X), min(s(j).Y); max(s(j).X), max(s(j).Y)];
s(j).Attribute1 = 'abc';
s(j).Attribute2 = 42;

shapewrite(s, 'point.shp');  
s2 = shaperead('point.shp');



This will return:

Geometry = Point
X =  597600
Y =  172250
Custom1 = [](0x0)
Custom2 = [](0x0)


This only seems to happen when the structure contains a single record. For
example, the following code will produce the expected result:


s = struct;
j = 1;
s(j).Geometry = 'Point';
s(j).X = 597600;
s(j).Y = 172250;
s(j).BoundingBox = [min(s(j).X), min(s(j).Y); max(s(j).X), max(s(j).Y)];
s(j).Attribute1 = 'abc';
s(j).Attribute2 = 42;

j = 2;
s(j).Geometry = 'Point';
s(j).X = 598600;
s(j).Y = 170250;
s(j).BoundingBox = [min(s(j).X), min(s(j).Y); max(s(j).X), max(s(j).Y)];
s(j).Attribute1 = 'efg';
s(j).Attribute2 = 43;

shapewrite(s, 'point.shp');  


It is likely that the issue is in the dbwrite() function used by shapewrite to
create the dBase file.




    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?57669>

_______________________________________________
  Message posté via Savannah
  https://savannah.gnu.org/