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Drop the #900 dateline and high-Dec tiles from the DR6 r tile list - #969

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cailmdaley merged 1 commit into
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fix/900-skip-tiles
Oct 19, 2026
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cailmdaley merged 1 commit into
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fix/900-skip-tiles

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Closes #900.

auxdir/CFIS/tiles_202604/tiles_r.txt is the default tile source for data runs (init_run_v2.0.py). It now lists the 22,901 tiles that enter the DR6 shape catalogue, down from 23,114. The 213 removed tiles are recorded, each with its reason, in the new tiles_r_excluded.txt:

  • 32 dateline duplicates. An off-by-one at the RA = 360° wrap in the MegaPipe tile system; each tile lies at RA 360.0–361.3° and covers sky already held by tiles near RA 0°. List from Mike Hudson.
  • 181 tiles at Dec ≥ 82.5° (tile index y ≥ 345). The default MegaPipe tile image does not cover the full tile.

None of the 213 had been processed in the DR6 production on Nibi. The production feeder already skips them.

Claude (Opus) on behalf of Cail

🤖 Generated with Claude Code

tiles_r.txt now lists the 22,901 tiles that enter the shape catalogue.
The 213 removed tiles are recorded with their reasons in
tiles_r_excluded.txt: 32 RA=360 wrap duplicates (list from Mike Hudson)
and 181 tiles at Dec >= 82.5 whose MegaPipe image doesn't cover the tile.

Closes #900.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
@cailmdaley
cailmdaley merged commit a1890c9 into develop Oct 19, 2026
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Exclude the redundant dateline tiles and high-Dec tiles from the DR6 shape catalogue

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