[Qgis-developer] What transformation is QGIS using from NAD27 to WGS84?

[Alexandre Neto]

We are having some problems loading a WMS layer pushed to Geoserver with
NAD27 (EPSG:4267), When it is opened in QGIS, it shows a shift of around 20
m. My doubt here is, what are the parameters QGIS is using to this
transformation?

Looking into qgis's srs.db, the prefered transformation is one with the 7
parameters of molodensky transformation, can I assume that that's what it's
being used if not asked to the user?

How about grids? In Osgeo4w installation seems to be a few grids available
in the shared folder including a "conus" file that could be useful for
transformation. Could we use it?

Thanks!

Alexandre Neto

-- 
Alexandre Neto
---------------------
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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