Hi,
To follow myself up, I just had a look at the
documentation (i know, next time I'll look
before posting :-)) - the bounding window is sampled
in destination coordinates, so my remark viz
choosing SAMPLE_STEPS as the divisor of x-resolution
is not correct - but increasing the number of SAMPLE_
Hi Ghislain,
you could try increasing the "SAMPLE_STEPS" warp option, e.g.
gdalwarp -wo "SAMPLE_STEPS=210"
which should improve the localization of the source bounding
window.
Choosing SAMPLE_STEPS as a divisor of the source datasets x-resolution
should help avoid this discretization a
Hi,
> I'd be very interested in a native GDAL implementation of perspective
> warping. I've done something similar to the work Manuel has done on
> Qgis, having written an in-house application that uses GSL/CBLAS. So I'd
> be happy to help where I can, but as Manuel says, writing robust SVD
> rout
Hi Lance,
I suspect the most probable cause for the transform failure is a non-
invertible geotransform matrix in CSTrans (i.e., due to incorrectly set
scale values).
What are m_srcGT / m_dstGT set to (the 6 actual values, not
the code fragment used to set them)? m_srcGT should be
set to the sou
Hi Jeffrey,
> I've thought about implementing a projective transform in the qgis
> georeferencer, so if you're interested I'll let you know when I get around
> to it.
If this interest you, I have just commited an initial implementation of
projective warping (see https://trac.osgeo.org/qgis/change
Hi Jeffrey,
> Hi, all - I need 4-point (GCP) projective warping (
> http://docs.bentley.com/en/I-RASB/irasbhelp171.html) for my very basic
> rubbersheeting app at http://cartagen.org/maps (getting full-res TMS output
> working). These are for aerial photographs, not scanned images.
to implement t
Hi,
> Gdal_translation has on option
> [-gcp pixel line easting northing [elevation]]*
this should also work using the VRT output format, which has the advantage
that the raster data doesn't need to be written to an intermediate file (VRT
"wraps" the original data).
E.g.:
gdal_translate [-gcp
