feat(vrt): single-band viewer VRTs for scalar datasets#68
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Adds a `viewer_bands()` hook to `Dataset` (analogous to `rgb_composites()`) and a `build_single_band_vrt_xml()` function to `vrt.py`. `_publish_rgb_vrts` now falls back to single-band Gray mosaic VRTs when no RGB composite exists, grouping by CRS WKT so a multi-UTM-zone run (e.g. SWOT France) emits one VRT per zone (`run-wse-epsg32631.vrt`). `SwotRaster100mDataset` overrides `viewer_bands()` to expose one composite per configured variable. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes #66.
Summary
SingleBandCompositedataclass todatasets/base.py(mirrorsRgbCompositebut for 1-band/scalar products)viewer_bands() -> list[SingleBandComposite]hook toDatasetbase (default:[])SwotRaster100mDatasetoverridesviewer_bands()to expose one composite per configured variable (e.g.wse)build_single_band_vrt_xml(grids)tovrt.py— same mosaic logic as RGB but emits a 1-band Gray VRTcrs_epsg(crs_wkt)helper to extract the outermost EPSG code from WKT (used for per-zone VRT naming)_publish_rgb_vrtsinrunner.pyto also iterateviewer_bands()after the RGB composites loop:run-wse-epsg32630.vrt,run-wse-epsg32631.vrt,run-wse-epsg32632.vrtinstead of nothingrun-wse.vrtTest plan
test_single_band_vrt_has_one_gray_band— Gray colorinterp, correct pixel valuetest_single_band_vrt_mosaics_two_tiles— union extent, correct DstRect placementtest_single_band_vrt_raises_on_empty_gridstest_crs_epsg_extracts_from_wkt— extracts outermost EPSG (not nested datum/spheroid codes)test_crs_epsg_returns_none_for_unknowntest_swot_viewer_bands_default— defaultwse→SingleBandComposite(name="wse", band="wse")test_swot_viewer_bands_custom_variablestest_base_dataset_viewer_bands_returns_empty— SingleObjectDataset returns[]🤖 Generated with Claude Code