Not complaining or whatever,
but a truly generic rotation function can be made by using a single
ST_Affine call
ST_Affine(T^-1. R . T) ,
where T is the 4-4 translation matrix (id + translation vector on last
column), and R is a rotation matrix (possibly a composition of rotation
around X,Y,Z. It
On 15 Dec 2013 21:50, Stephen Mather step...@smathermather.com wrote:
Hmm, I know so little about Euler, strike, dip and rake. What are the
advantages?
Euler angles are very well known, and have a wide range of applications[1].
Strike, dip and rake[2,3] are familiar to any geology student,
Simpler often is less flexible. That's the trade-off. You want infinite
flexibility, create a matrix, whether affine, Eulerian, from the discipline
of geology, or otherwise. Boom, problem solved.
Measured/monitored systems often have these parameters as orthogonally
bound parameters, e.g.:
Start in the regress directory found in the root of the postgis source.
You'll see that there are always two files for any particular test
(MYTEST.sql and MYTEST_expected). To include MYTEST as part of make
check, you add MYTEST to regress/Makefile.in
-bborie
On Sat, Dec 14, 2013 at 10:29 PM,
Thanks Bob,
That looks like a great resource. Now when will one of my bits of
inspiration get permanently etched into a stone bridge? :D
Best,
Steve
On Sun, Dec 15, 2013 at 1:56 AM, Bob and Deb bobd...@gmail.com wrote:
So you don't like to do linear algebra? :-) Well, you might be
Awesome. I'll take a look.
On Sun, Dec 15, 2013 at 1:29 PM, Bborie Park dustym...@gmail.com wrote:
Start in the regress directory found in the root of the postgis source.
You'll see that there are always two files for any particular test
(MYTEST.sql and MYTEST_expected). To include MYTEST
What do you need to rotate on either X or Y axes? And is it always aligned
to either grid directions? I personally see these functions as rather
limiting and wouldn't miss them if they vanished.
I have thought of developing a better 3d rotate function that is
independent of grid X and Y
Hmm, I know so little about Euler, strike, dip and rake. What are the
advantages?
What I do know is that it's easy now to construct a 3 axis rotation
function (which also might be better handled with ST_Affine):
http://trac.osgeo.org/postgis/attachment/ticket/2575/
-- Function:
Hi All,
I think I avoided doing linear algebra, which is good since I never
studied it... .
This is my cludgy patch for making a version of
geometry ST_RotateX(geometry geomA, float rotRadians, geometry pointOrigin)
It's not pretty enough to be a real patch ('cause my brain couldn't do
that
Ahem-- bugs fixed:
-- Function: st_rotatex(geometry, double precision, geometry)
CREATE OR REPLACE FUNCTION ST_RotateX(geomA geometry, rotRadians
double precision, pointOrigin geometry)
RETURNS geometry AS
$BODY$
- Transform geometry to nullsville (0,0,0) so rotRadians will take
place
I have ticketed. It's a little messy of a ticket (actually two), so
apologies for that.
http://trac.osgeo.org/postgis/ticket/2570
http://trac.osgeo.org/postgis/ticket/2571
I have not yet written any unit tests. Where would I begin...
On Sun, Dec 15, 2013 at 1:02 AM, Bborie Park
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