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Chandra-Align

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Chandra-Align

feat: scientific photogrammetric workstation - preprocessing, ground metrics, visualization, export, enhanced UI

38d2728 about 1 month ago

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# Quick 10-Line QGIS Ground-Truth Point Picking Guide

**Open Project**: Launch QGIS and double-click `data/qgis_picking.qgz` to load rasters and overlap grid.
**Target Area**: Pick points only inside the red outline (42% overlap region) across center and corners.
**Target Count & Spacing**: Aim for **25 points total**, with at least 1 point per $30\text{ m}$ grid cell.
**What to Click**: Choose sharp crater rim crests, bright boulder clusters, small crater centers, or crisp ridge crests.
**What to Avoid**: Never click shadow interiors, feature-less mare, features $< 5\text{ px}$, or anything near frame edges.
**Two-Pass Picking**: Pick every physical feature **TWICE** — once on Reference layer, once on Registered Product layer.
**Export CSV 1**: Select Reference layer $\rightarrow$ Export Features As $\rightarrow$ CSV as `data/heldout_ref.csv`.
**Export CSV 2**: Select Registered Product layer $\rightarrow$ Export Features As $\rightarrow$ CSV as `data/heldout_prod.csv`.
**Row Pairing Rule**: Ensure Row $N$ in `heldout_ref.csv` corresponds to the exact same feature as Row $N$ in `heldout_prod.csv`.
**Attribute Fields**: Assign `confidence` (1=Certain, 2=Pretty Sure, 3=Best Guess) and `feature_type` (crater_rim/boulder/crater_center/ridge).

	# Quick 10-Line QGIS Ground-Truth Point Picking Guide

	1. Open Project: Launch QGIS and double-click `data/qgis_picking.qgz` to load rasters and overlap grid.
	2. Target Area: Pick points only inside the red outline (42% overlap region) across center and corners.
	3. Target Count & Spacing: Aim for 25 points total, with at least 1 point per $30\text{ m}$ grid cell.
	4. What to Click: Choose sharp crater rim crests, bright boulder clusters, small crater centers, or crisp ridge crests.
	5. What to Avoid: Never click shadow interiors, feature-less mare, features $< 5\text{ px}$, or anything near frame edges.
	6. Two-Pass Picking: Pick every physical feature TWICE — once on Reference layer, once on Registered Product layer.
	7. Export CSV 1: Select Reference layer $\rightarrow$ Export Features As $\rightarrow$ CSV as `data/heldout_ref.csv`.
	8. Export CSV 2: Select Registered Product layer $\rightarrow$ Export Features As $\rightarrow$ CSV as `data/heldout_prod.csv`.
	9. Row Pairing Rule: Ensure Row $N$ in `heldout_ref.csv` corresponds to the exact same feature as Row $N$ in `heldout_prod.csv`.
	10. Attribute Fields: Assign `confidence` (1=Certain, 2=Pretty Sure, 3=Best Guess) and `feature_type` (crater_rim/boulder/crater_center/ridge).