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Topic 24 - Functional Model for Crustal Deformation
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| Definitionskos:definition | This OGC Abstract Specification (AS) defines a general parameterization of surface deformation models. All objects on the surface of the Earth are moving. Apparently fixed features such as buildings are moving with the Earth’s crust, being subject to ongoing plate tectonic movement and episodic deformation events such as earthquakes. Increasingly, applications and users rely on global positioning methods, such as Global Navigation Satellite Systems (GNSS) observations, to precisely determine the coordinates of features. The resulting coordinates are then stored in databases and used in a wide range of applications, such as Geographic Information Systems (GIS). However, the coordinates from GNSS are referenced to global reference frames and coordinate reference systems (CRSs). In these reference frames the coordinates of apparently fixed objects are continually changing. This creates a challenge for the geospatial and positioning community: How to account for this movement when comparing data sets observed at different times, or how to locate an object observed in the past. This problem is generally addressed in one of two ways: Defining a reference epoch for the CRS of coordinates held in the GIS, often by defining a CRS with a reference epoch, or Using a CRS which is fixed relative to the surface of the Earth. In practice there is little difference between these two approaches. Neither the position at a reference epoch, nor the coordinates in a static CRS, can be directly measured by global positioning methods. Propagating the observed coordinates to a reference epoch, or transforming to a static CRS, requires a deformation model — a mathematical model of the deformation of the Earth’s surface. Common uses of a deformation model include: Determining the current location of an object based on historic measurement of its location, Propagation of the current observed location of an object to the reference epoch of a static CRS, Determining the spatial relationship of data sets observed at different times, and Predicting the location of an object at some future time. Currently, many national geodetic agencies have developed or are planning to develop regional deformation models. However, the current models generally use customized formats and software developed by each agency. This AS describes a way of parameterizing a deformation model such that it can be encoded into a data set and used in software for coordinate operations. The AS defines how to calculate the displacement of a point between two different epochs. It provides a common understanding between producers of deformation models and developers of software about what the deformation is and how it will be used. This AS will allow users of compliant software applying a compliant deformation model to be confident that the model is being used as intended by its producers. |
|---|---|
| Broaderbroader | Abstract Specification Topic |
| http://purl.org/dc/terms/createdcreated | 2024-04-29 |
| Creatorcreator | Chris Crook |
| seeAlsoseeAlso | https://docs.ogc.org/as/22-010r4/22-010r4.html |
| Statusstatus | valid |
| Notationnotation | 22-010r4 |
| Alternative LabelaltLabel | 22-010r4 |
| Topic 24 - Functional Model for Crustal Deformation | |
| OGC document typedoctype | Abstract Specification Topic |