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Add EQL gridder in geodetic coordinates

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Issue 类型
功能
描述清晰度
基本清楚
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停滞
技术栈
python
领域
data

调研方向

首先查看现有的 EQL gridder 以及前置 issue #154 和 #165。明确应如何表示大地测量数据点、源位置、欧几里得距离,以及以 WGS84 为默认值的 boule.Ellipsoid。完成的标准是提供一个大地测量 EQL gridder,同时继续支持球面 EQL API。

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描述

enhancement

Description of the desired feature

Would be nice to have an equivalent layer gridder that works in geodetic coordinates.
This means that the data points and the location of the point sources should be defined in geodetic coordinates.
The Green's function should still be equal to 1 over the Euclidean distance between each data point and each source.
After #154 is closed, we will be able to easily compute this distance between two given points defined in geodetic coordinates.
The new EQL gridder should also take the reference ellipsoid, which should be a instance of boule.Ellipsoid. By default, we should set it to the WGS84 ellipsoid, for which we need to add Boule as a dependency of Harmonica.
Would be better to wait until #165 is fixed before start working on this issue: the idea is to have a common base class for every EQL gridder.

After having a geodetic EQL, we could remove the gallery example for the spherical EQL.
Using the geodetic EQL will be more straight forward for users (they don't need to perform coordinate conversions), but we should keep the spherical EQL on the API just in case we want it in the future.

Are you willing to help implement and maintain this feature? Yes

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  3. Fork 仓库,在一个分支上完成修改。
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