PixelLattice¶

class nyx.instrument.interpolation.PixelLattice[source]¶

Bases: Module

The sampling lattice every pixel’s response grid is a window onto.

Parameters:

origin (array-like, shape (2,)) – Position of lattice node (0, 0) as [lon, lat], in radians.
step (array-like, shape (2,)) – Node spacing along [lon, lat], in radians.
offset (array-like, shape (n_pixels, 2)) – Node index of each pixel’s response window corner, [lon, lat].
grid_shape (tuple of int) – Response table shape (height, width) of a single pixel, with height running along longitude and width along latitude.

Attributes Summary

`grid`	Per-pixel response sample coordinates, shape `(n_pixels, 2, grid_dim)`.
`grid_shape`
`n_pixels`	Number of pixels indexed.
`offset`
`origin`
`shape`
`step`
`window_centers`	Centre of each pixel's response window, shape `(n_pixels, 2)`, in radians.

Methods Summary

from_grid(grid, values[, tol])

Recover the lattice underlying explicit sample coordinates.

Attributes Documentation

grid¶

Per-pixel response sample coordinates, shape (n_pixels, 2, grid_dim).

The explicit form from_grid() consumes.

window_centers¶: Centre of each pixel’s response window, shape (n_pixels, 2), in radians.

Methods Documentation

classmethod from_grid(grid, values, tol=0.001)[source]¶

Recover the lattice underlying explicit sample coordinates.

Parameters:

grid (array-like, shape (n_pixels, 2, grid_dim)) – Radians.
values (array-like, shape (..., n_pixels, height, width)) – Every leading axis is checked.
tol (float) – Tolerance, in units of one step.

Return type:

PixelLattice

Raises:

ValueError – Unless the responses vanish on their boundary rows and columns and the sample coordinates sit on the nodes of a common lattice.