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ENH: Decode NEXRAD Level 2 message types 4 and 29 - #4151
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| def test_level2_msg29_inline(): | ||
| """Check that an inline message 29 decodes to environmental grids.""" | ||
| f = Level2File(get_test_data('KICX_20170712_1458', as_file_obj=False)) |
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Add support for two more RDA->RPG message types in Level2File: * Message 4 (console message): operator-facing RDA console text per ICD 2620002 Table VI. Decoded into `console_msgs`, ignoring non-printable content. * Message 29 (metadata/model data): found both inline in volumes (e.g. KICX_20170712) and as the sole record in `_MDM` sidecar files. The body is a product header + description block (ICD 2620001) followed by a BZIP2-compressed symbology block holding an XDR-serialized grid component (Appendix E). Decoded into `model_data` as the 'Environmental Gridded Data' product: model fields (geopotential height, temperature, humidity, U/V wind) on a Lambert-conformal grid surrounding the radar, with self-describing attributes (projection, model name/run/valid times, bounds). Supports the size_hw==0xFFFF convention where the segment fields carry the total record size (ICD 2620002P), used by the standalone _MDM files. A small XDR reader replaces xdrlib, which was removed from the stdlib in Python 3.13 (PEP 594). Validated against a real KLSX _MDM file (166 grids across 34 pressure levels) and the existing KICX_20170712_1458 test volume, whose inline message 29 now decodes instead of warning. Closes Unidata#95.
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Follow-up to #4147. Closes #95.
Adds decoding for two more RDA->RPG message types in
Level2File:Message 4 — RDA console message
Operator-facing console text per ICD 2620002 Table VI (u16 length + ASCII). Decoded into
console_msgs; non-printable bodies are ignored.Message 29 — metadata / model data
The long-undocumented type from #95. Found both inline in volumes (the existing
KICX_20170712_1458test file carries one — itsUnknown message: 29warning is now a decode) and as the sole record in_MDMsidecar files.The body is a product header + product description block (ICD 2620001) followed by a BZIP2-compressed symbology block holding an XDR-serialized grid component per Appendix E. Decoded into
model_data— in practice this is the 'Environmental Gridded Data' product: model fields (geopotential height, temperature, RH, U/V wind, pressure) on a 60x60 Lambert-conformal grid surrounding the radar, with self-describing attributes (projection, model name/run/valid times, corner coordinates).Implementation notes:
size_hw == 0xFFFFconvention where the segment fields carry the total record size (ICD 2620002P) — used by standalone_MDMfiles — plus normal segmented records via_buffer_segment.xdrlibwas removed in Python 3.13 (PEP 594).Validated against a real
KLSX20261008_205554_V06_MDMfile (166 grids across 34 pressure levels, 6 parameters) and synthetic unit tests for both messages (framed/segmented/malformed).