22 lines
1.1 KiB
Markdown
22 lines
1.1 KiB
Markdown
# Lunar source data
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`moon_surface.bin.gz` is a printer-scale, deterministic reduction of two Lunar Reconnaissance Orbiter Camera products:
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- Terrain: **WAC GLD100 with LOLA 30 m DTM poleward of 75°**, represented locally by `WAC_GLD100_V1.0_GLOBAL_with_LOLA_30M_POLE.0032km.cub`.
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- Tone: **LROC WAC normalized reflectance**, incidence 30°, emission 0°, phase 30°, represented locally by four 8-bit cloud-optimized GeoTIFF quadrants.
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The reduced asset uses the terrain grid (3,412 × 1,706). Elevation is stored as signed metre offsets from the 1,737,400 m lunar datum; reflectance is bilinearly resampled onto that grid and stored as unsigned bytes. The embedded header records source filenames and SHA-256 checksums.
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The GLD100 record is public domain and requests citation of F. Scholten, J. Oberst, K.-D. Matz, T. Roatsch, M. Wählisch, E. J. Speyerer, M. S. Robinson, and the LROC Team. See:
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- https://astrogeology.usgs.gov/search/map/moon_lroc_wac_dtm_gld100_118m
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- https://lroc.im-ldi.com/images/downloads
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Rebuild with:
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```sh
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bundle exec ruby bin/prepare_lunar_data
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```
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The preparation command requires GDAL; ordinary model generation does not.
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