harmonica.DatasetAccessorTesseroidLayer

harmonica.DatasetAccessorTesseroidLayer

class harmonica.DatasetAccessorTesseroidLayer(xarray_obj)[source]

Define dataset accessor for layer of tesseroids

Warning

This class in not intended to be initialized. Use the tesseroid_layer accessor for accessing the methods and attributes of this class.

See also

harmonica.tesseroid_layer

Methods Summary

DatasetAccessorTesseroidLayer.get_tesseroid(indices)

Return the boundaries of the chosen tesseroid

DatasetAccessorTesseroidLayer.gravity(...[, ...])

Computes the gravity generated by the layer of tesseroids

DatasetAccessorTesseroidLayer.update_top_bottom(...)

Update top and bottom boundaries of the layer
DatasetAccessorTesseroidLayer.get_tesseroid(indices)[source]

Return the boundaries of the chosen tesseroid

Parameters

indices (tuple) – Indices of the desired tesseroid of the layer in the following order: (index_northing, index_easting).

Returns

tesseroid (tuple) – Boundaries of the prisms in the following order: longitude_w, longitude_e, latitude_s, latitude_n, bottom, top.

DatasetAccessorTesseroidLayer.gravity(coordinates, field, density_name='density', **kwargs)[source]

Computes the gravity generated by the layer of tesseroids

Parameters

  • coordinates (list or 1d-array) – List of array containing latitude, longitude and upward of the computation points defined on a spherical coordinates system. upward coordinate should be in meters.

  • field (str) – Gravitational field that wants to be computed. The variable fields are: - Gravitational potential: potential - Downward acceleration: g_z

  • density_name (str (optional)) – Name of the property layer (or data_var of the xarray.Dataset) that will be used for the density of each tesseroid in the layer. Default to "density"

Returns

result (array) – Gravitational field generated by the tesseroid on the computation point in mGal

See also

harmonica.tesseroid_gravity

DatasetAccessorTesseroidLayer.update_top_bottom(surface, reference)[source]

Update top and bottom boundaries of the layer

Change the values of the top and bottom coordinates based on the passed surface and reference. The top and bottom boundaries of every tesseroid will be equal to the corresponding surface and reference values, respectively, if surface is above the reference on that point. Otherwise the top and bottom boundaries of the tesseroid will be equal to its corresponding reference and surface, respectively.

Parameters

  • surface (2d-array) – Array used to create the uppermost boundary of the tesseroid layer. All heights should be in meters. On every point where surface is below reference, the surface value will be used to set the bottom boundary of that tesseroid, while the reference value will be used to set the top boundary of the tesseroid.

  • reference (2d-array or float) – Reference surface used to create the lowermost boundary of the tesseroid layer. It can be either a plane or an irregular surface passed as 2d array. Height(s) must be in meters.

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harmonica.DatasetAccessorPrismLayer

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