[GRASS-dev] v.proj: line densification added for reprojection error minimization

Markus Neteler neteler at osgeo.org
Sun Dec 14 10:04:23 PST 2014


On Sun, Dec 14, 2014 at 6:14 PM, Helmut Kudrnovsky <hellik at web.de> wrote:
> Helmut Kudrnovsky wrote
>>>The result (see screenshot, maybe an extreme example but yet helpful
>>>to show the improvement) shows how nicely the projection is performed
>>>now (green color is new output).

BTW; now posted also here:
http://courses.neteler.org/grass-gis-7-vector-data-reprojection-automated-vertex-densification/


>>>Please benchmark this with other GIS...
>>
>> attached, done with a GIS from redmont
>
> to be fair, there is a tool there for densifying lines and polygons; applied
> this first, vector reprojecting also works correctly there.
>
> <http://osgeo-org.1560.x6.nabble.com/file/n5177819/box_latlong_10deg_densified_proj.png>

Good - but is that the default or requires extra tricks/knowledge?

And how about QGIS? Because ogr2ogr delivers only the trapezoid with
default settings.

Markus


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