Multi-component time-based deformation model¶

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New in version 7.1.0.

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Alias	defmodel
Input type	Geodetic or projected coordinates (horizontal), meters (vertical), +decimalyear (temporal)
Output type	Geodetic or projected coordinates (horizontal), meters (vertical), +decimalyear (temporal)
Domain	4D
Available forms	Forward and inverse

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The defmodel transformation can be used to represent most deformation models +currently in use, in particular for areas subject to complex deformation, including +large scale secular crustal deformation near plate boundaries and vertical deformation +due to Glacial Isostatic Adjustment (GIA). These can often be represented by a constant +velocity model. Additionally, many areas suffer episodic deformation events such as +earthquakes and aseismic slow slip event.

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The transformation relies on a “master” JSON file, describing general metadata on +the deformation model, its spatial and temporal extent, and listing spatial +components whose values are stored in Geodetic TIFF grids (GTG). +The valuation of each component is modulated by a time function (constant, step, +reverse step, velocity, piecewise, exponential).

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All details on the content of this JSON file are given in the Proposal for encoding +of a Deformation Model

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If input coordinates are given in the geographic domain (resp. projected domain), +the output will also be in the geographic domain (resp. projected domain). +The domain should be the corresponding to the source_crs metadata of the model.

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This transformation is a generalization of the Kinematic datum shifting utilizing a deformation model transformation.

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Parameters¶

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Required¶

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++model=<filename>¶: Filename to the JSON master file for the deformation model.
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Example¶

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Transforming a point with the LINZ NZGD2000 deformation model:

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echo 166.7133850980 -44.5105886020 293.3700 2007.689 | cct +proj=defmodel +model=nzgd2000-20180701.json
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