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Check that sim-side tile SExtractor reproduces the DR6 detections data uses

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

调研方向

Start with the tile_detection=sextractor path, default_tile.sex, catalogue_neighbour_marking, and the detection.detection_threshold_policy record. Reproduce the Nibi comparison for tile 202.301, then run a handful of data tiles and compare DR6 matches, completeness, purity, and deblend rates by magnitude and size. Done means the agreement is recorded in the policy or the mismatch and calibration systematic are documented.

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描述

Since #897, data takes its tile galaxy sample from the UNIONS DR6 catalogue, while image simulations detect with ShapePipe's own tile SExtractor run, configured with MegaPipe-like parameters (default_tile.sex: threshold 1.0, minarea 3, 7x7 FWHM-3 kernel, DEBLEND_MINCONT 0.002, BACK_SIZE 512). Shear calibration from the sims assumes the two selections match: detection-dependent multiplicative bias, blending, and the neighbour footprints used for masking (catalogue_neighbour_marking). Nothing checks this on output. SExtractor version, weights and background inputs can all differ from MegaPipe's run.

Proposed check: run tile_detection=sextractor on a handful of data tiles and match against DR6, comparing completeness and purity vs magnitude and size, and the deblend rate. The Nibi run already has one such pair (tile 202.301: 35,924 of 36,065 objects match within 2 px). If they agree, cite the result in the detection.detection_threshold_policy record; if not, tune default_tile.sex or record the mismatch as a calibration systematic.

Claude Opus 5.5 on behalf of Cail

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  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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