hi sunburned,
> The Sunburned Surveyor
> I'm on the way of writing a new library for coordinate transformation,
> and I'm interested by your experience, as my goal is to manage properly
> 3D and grid-based transformations, not only projections and BW
> transformations.
>
just want to remind yo
So.. my two cents on the topic
on European CRS. I can recommend this site that also should have some
parameters for the different countries:
http://crs.bkg.bund.de/crs-eu/
On the question with the warping tool. Of course, one could calculate
the BW paramters. But the problem is that this would
Sunburned Surveyor a écrit :
> As surveyors we always hit local control monuments to calculate a
> "best fit" datum transformation. This is neede because "one size fits"
> all transformations between horizontal datums in the states aren't
> always precise. This is especially true when moving from h
Hi Michael
>.. a precision of 1-2m (5m at worst), which is not that good.
>It is now recommended to use a grid to interpolate precise parameters which
> makes it possible to get a precision of a few centimeters..
I am aware of this. Since my original interest was the "geological map
Michael wrote: "It is now recommended to use a grid to interpolate
precise parameters
which makes it possible to get a precision of a few centimeters.
I don't know what is the system used in USA, but I know that Canada and
Australia also use grid based transformations (or corrections?) based on
NTV
Hi Peppe,
As you mention, bursa-wolf transformation is not always enough to make
precise transformation between old local reference system and new
spatial reference system.
The advantage is that it relies on a set of only 7 parameters and a well
known algorithm.
To do more precise transformatio
Hi,
I did a test with the CTS plugin.
As control I used Taspunto, a software for Italian coordinate transformation
edited by Italian government. This software doen't use formulas for
transformation but on a grid of points (1500) in the Italian territory and
surroundings. It is considered to
