[Qgis-user] Can QGIS plot single line segments?

[Gavin Macaulay]

Tim Keitt wrote:
> I have what I think is a perfectly good shape file. ogrinfo returns
>
> NFO: Open of `jagmesh.shp'
>       using driver `ESRI Shapefile' successful.
>
> Layer name: jagmesh
> Geometry: Line String
> Feature Count: 19047
> Extent: (-3547484.000000, -5785886.000000) - (4866967.000000, 3747255.000000)
> Layer SRS WKT:
> PROJCS["Lambert_Azimuthal_Equal_Area",
>     GEOGCS["unnamed ellipse",
>         DATUM["unknown",
>             SPHEROID["Unknown",6370997,0]],
>         PRIMEM["Greenwich",0],
>         UNIT["Degree",0.017453292519943295]],
>     PROJECTION["Lambert_Azimuthal_Equal_Area"],
>     PARAMETER["latitude_of_center",0],
>     PARAMETER["longitude_of_center",-80],
>     PARAMETER["false_easting",0],
>     PARAMETER["false_northing",0],
>     UNIT["Meter",1]]
> is.edge.so: Real (11.0)
> is.edge.ta: Real (11.0)
>
> I loaded it into postgis. The first 5 lines are:
>
>  gid |                                      astext
> -----+-----------------------------------------------------------------------------------
>    1 | LINESTRING(-118068.9 -658036.18355628,-118068.9 -658036.18355628)
>    2 | LINESTRING(-120565.103973043 -652437.1,-120565.103973043 -652437.1)
>    3 | LINESTRING(-108926.6 -648353.4,-108926.6 -648353.4)
>    4 | LINESTRING(3666461.07939581 -119248.798562935,3666461.07939581
> -119248.798562935)
>    5 | LINESTRING(3636409.07468477 -129061.988213268,3636409.07468477
> -129061.988213268)
> (5 rows)
>
> Neither the shapefile or the postgis table will display in QGIS. QGIS
> clearly digests the data and looks like it wants to draw something,
> but the plot is blank.
>
> THK
>
>   
Tim,

The 5 linestrings that you gave as an example are all of zero length. 
Hence if all 19407 linestrings have that property, what qgis is 
displaying is appropriate.

Regards

Gavin