Module Thin Plate Spline (TIN)
Creates a 'Thin Plate Spline' function for each triangle of a TIN and uses it for subsequent gridding. The TIN is internally created from the scattered data points input. The 'Neighbourhood' option determines the number of points used for the spline generation. 'Immediate neighbourhood' includes the points of the triangle as well as the immediate neighbour points. 'Level 1' adds the neighbours of the immediate neighbourhood and 'level 2' adds the neighbours of 'level 1' neighbours too. A higher neighbourhood degree reduces sharp breaks but also increases the computation time.
References:
- Donato G., Belongie S. (2002): 'Approximation Methods for Thin Plate Spline Mappings and Principal Warps', In Heyden, A., Sparr, G., Nielsen, M., Johansen, P. (Eds.): 'Computer Vision - ECCV 2002: 7th European Conference on Computer Vision, Copenhagen, Denmark, May 28-31, 2002', Proceedings, Part III, Lecture Notes in Computer Science. Springer-Verlag Heidelberg; pp.21-31.
- Elonen, J. (2005): 'Thin Plate Spline editor - an example program in C++', http://elonen.iki.fi/code/tpsdemo/index.html.
- Author: (c) 2006 by O.Conrad
- Specification: grid
- Menu: Grid|Gridding|Spline Interpolation
Parameters
| Name | Type | Identifier | Description | Constraints |
Input | Points | Shapes (input) | SHAPES | - | - |
Options | Attribute | Table field | FIELD | - | - |
Regularisation | Floating point | REGULARISATION | - | Minimum: 0.000000 Default: 0.000100 |
Neighbourhood | Choice | LEVEL | - | Available Choices: [0] immediate [1] level 1 [2] level 2 Default: 1 |
Add Frame | Boolean | FRAME | - | Default: 1 |
Command-line
Usage: saga_cmd grid_spline 2 -SHAPES <str> [-FIELD <str>] [-REGULARISATION <str>] [-LEVEL <str>] [-FRAME <str>] [-TARGET_DEFINITION <str>] [-TARGET_USER_XMIN <str>] [-TARGET_USER_XMAX <str>] [-TARGET_USER_YMIN <str>] [-TARGET_USER_YMAX <str>] [-TARGET_USER_SIZE <str>] [-TARGET_USER_FITS <str>] [-TARGET_TEMPLATE <str>] [-TARGET_OUT_GRID <str>]
-SHAPES:<str> Points
Shapes (input)
-FIELD:<str> Attribute
Table field
-REGULARISATION:<str> Regularisation
Floating point
Minimum: 0.000000
Default: 0.000100
-LEVEL:<str> Neighbourhood
Choice
Available Choices:
[0] immediate
[1] level 1
[2] level 2
Default: 1
-FRAME:<str> Add Frame
Boolean
Default: 1
-TARGET_DEFINITION:<str> Target Grid System
Choice
Available Choices:
[0] user defined
[1] grid or grid system
Default: 0
-TARGET_USER_XMIN:<str> Left
Floating point
Default: 0.000000
-TARGET_USER_XMAX:<str> Right
Floating point
Default: 100.000000
-TARGET_USER_YMIN:<str> Bottom
Floating point
Default: 0.000000
-TARGET_USER_YMAX:<str> Top
Floating point
Default: 100.000000
-TARGET_USER_SIZE:<str> Cellsize
Floating point
Minimum: 0.000000
Default: 1.000000
-TARGET_USER_FITS:<str> Fit
Choice
Available Choices:
[0] nodes
[1] cells
Default: 0
-TARGET_TEMPLATE:<str> Target System
Grid (optional input)
-TARGET_OUT_GRID:<str> Target Grid
Grid (output)