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+ // Copyright (c) 2020-2021 Swift Navigation Inc.
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+ // Contact: Swift Navigation <dev@swiftnav.com>
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+ //
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+ // This source is subject to the license found in the file 'LICENSE' which must
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+ // be be distributed together with this source. All other rights reserved.
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+ //
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+ // THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
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+ // EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
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+ // WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
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+ //! Geoid height calculation
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+ //!
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+ //! GNSS positions have a height which is usually referenced to a ellipsoid,
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+ //! a smooth surface which very roughly approximates the mean sea level. This
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+ //! ellipsoid can deviate by a large amount for the actual local mean sea level
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+ //! due to the variations in the local gravitational field. A geoid model is
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+ //! built to better approximate these variations in mean sea level, and can be
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+ //! used to give a height relative to mean sea level which can be more helpful
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+ //! to an end user.
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use crate :: coords:: LLHRadians ;
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/// List of potential Geoid models used
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