[Draft] Atlanta scene-combination benchmark: run_benchmark.sh + study notebook (#169)

[bpurinton]

Draft, stacked on #197 (base issue-169-dem-benchmark; GitHub will retarget it to main when #197 merges). The processing script and the study notebook for the systematic part of #169 — no stereo runs have been launched; that is the one decision this PR is waiting on.

What's in it

• notebooks/WorldView/run_benchmark.sh — idempotent (every step skipped when its product exists), takes the data directory as its argument, identical stereo settings to run_mvs.sh / run_pairwise.sh, ASP bin appended to PATH. Produces, in order:

  1. wv_correct × 5 (the *_corr.tif intermediates were purged; two were dangling symlinks — handled).
  2. The seven remaining pairs → all ten pairs, convergence 5–32°.
  3. dem_mosaic of all ten pairs and of the six pairs > 15° (13-8, 8-16, 13-10, 8-21, 10-16, 10-21) — the test of whether the mosaic's problem is averaging, or averaging weak pairs in.
  4. A nested quad {13,10,16,21} (pair 13-10 ⊂ MVS3 ⊂ quad ⊂ MVS5) and a wide-spread triple {13,8,21}.

  ≈ 11–12 h on the laptop (pair ≈ 1 h, triple ≈ 2 h, quad ≈ 2.5 h), ~30 GB. The new left-image crop windows (nadir8 5461 9789 13354 12980, nadir16 6083 8756 12879 11461, nadir21 6467 8177 12495 10687) were derived from the BA clean matches inside the nadir13 crop exactly as CROP10 was — and the method reproduces CROP10 (5540 13223 13206 12931) bit for bit.

• notebooks/WorldView/worldview_spacenet_atlanta_benchmark.ipynb — the study, built so it is valid at every stage: it parses ba/run-convergence_angles.txt into the pair table, reproduces the crop-window derivation, documents the script, then scores whatever DEMs exist on disk with DEMBenchmark (listing the rest as pending) and draws the three analyses — NMAD vs. convergence angle over the pairs, the 2→3→4→5 nested-scene curve, and the MVS-vs-mosaic flow table at 3 and 5 scenes. Executed as committed against the six existing DEMs, so the figures are partial (3 of 10 pairs, 3 of 4 chain points) by design.

Not yet

• No docs card / toctree entry and no CHANGELOG line — those come when the runs exist and the notebook is complete.
• multi_stereo --mode dem_mosaic (ASP's own pairwise+mosaic flow, unreleased) is not in the local 3.8.0-alpha build; if a newer daily build is available it would be a good extra row.

To launch

bash notebooks/WorldView/run_benchmark.sh ~/Desktop/asp-plot-examples/atlanta_mvs 2>&1 | tee ~/Desktop/asp-plot-examples/atlanta_mvs/processing_benchmark.log

Then re-execute the notebook; the pending lists empty themselves and the write-up gets finished.