Function to project focal plane to horizon coords

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#1,184 1 comment 0 reactions 1 assignee View on GitHub

@mhasself is already working on this.

Since Apr 14, 2025.

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Description

This is a common operation that could easily be encapsulated in a general way:

from so3g.proj import quat

fp = aman.focal_plane
bs = aman.boresight

qbs = quat.rotation_lonlat(0, bs.el[0], bs.roll[0])
qdets = qbs * quat.rotation_xieta(fp.xi, fp.eta)

az_det, el_det, _ = quat.decompose_lonlat(qdets)
az_det = -az_det
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