Coordinate Systems and Locations
Introduction
During a test, it might be relevant what the exact locations of a transducer is. A location can be expressed relative to a defined coordinate system.
Coordinate Systems
A coordinate systems is an orthogonal, threedimensional system. It can be defined relative to a parent coordinate system with a rotation axis, a rotation angle and a translation.
Testdefiner
Coordinate systems are defined in a Testdefinition under Advanced -> Coordinate Systems. Systems can be loaded from a file or entered manually.
Notes:
- A coordinate system can have one predecessor coordinate system, what can be seen as its parent system.
- A coordinate system with predecessor 'none' is being seen as the root system, which usually is an inert system.
- The rotation axis doesn't have to be normalized.
- To transform from the predecessor system to the successor system, both the translation and the rotation are expressed in the predecessors system.
- The right-hand rule is applied for defining the rotation angle.
- For coordinate systems a shortname starting with 'coo_' is created. The first system has number 1500, successor systems have decreasing numbers down to 1451. Upon this, 50 coordinate systems are allowed.
The next fields are stored in this shortname, separated by a semicolon (';'):- name of predecessor coordinate system
- x-translation with respect to predecessor system
- y-translation with respect to predecessor system
- z-translation with respect to predecessor system
- x-rotation with respect to predecessor system
- y-rotation with respect to predecessor system
- z-rotation with respect to predecessor system
- rotation angle with respect to predecessor system
STREAM Library
The next functions are dealing with coordinate systems:
Function |
Description |
|---|---|
Read coordinate systems from the Testdefinition when reading a file |
|
(Re)define the relations between coordinate systems |
Locations
Testdefiner
A location is coupled one by one to a column. Therefore it can be defined on the Locations tab of a column, when indicated as sensor.
Notes:
- For locations a shortname starting with 'loc_' is created. The first location has number 1450, successor locations have decreasing numbers down to 1201. Upon this, 250 locations are allowed.
The next fields are stored in this shortname, separated by a semicolon (';'):- name of coordinate system
- x-translation with respect to coordinate system
- y-translation with respect to coordinate system
- z-translation with respect to coordinate system
STREAM Library
The next functions are dealing with coordinate systems:
Function |
Description |
|---|---|
Read sensor locations from the Testdefinition when reading a file |
|
(Re)define the location of the sensors relative to coordinate systems |
|
Transform coordinates of locations between coordinate systems |
