ekke da6f968725 Zonal-statistics Excel export, COG layer entry point, DE Africa ETL ...

Excel export (from TWG feedback)
- src/analysis/xlsx.js: a dependency-free XLSX writer — an .xlsx is a ZIP of
  XML, so this packs the required parts with a small stored-ZIP writer. Avoids
  SheetJS (stale npm package with advisories) and ExcelJS (heavy for an
  offline-first field app), and does not rely on the JSZip that only reaches us
  transitively via shp-write. Lazy-loaded as a ~5.6 kB chunk.
- After a zonal run the Analysis panel offers "Export table (Excel)", writing a
  two-sheet workbook: Results (figures as real numbers) and Parameters (zone
  and input layers with feature counts, the "Apply to" scope, membership rule,
  statistics, numeric field and export time) — so a table can be verified or
  reproduced later rather than being an unattributed set of numbers.
  The button is hidden for overlay runs and cleared when the mode changes.
- Verified against two independent readers: openpyxl loads it with zero
  warnings and correct numeric types, and LibreOffice Calc opens it as a
  spreadsheet. Also exercised end-to-end through the real zonal pipeline.

COG raster entry point
- Add External Layer gains a COG type alongside WMS/WFS/XYZ, with a URL
  pre-flight check that distinguishes a web page, a 404, a CORS block and a
  server without byte-range support — geotiff.js otherwise reports these only
  as an opaque "AggregateError: Request failed".

Digital Earth Africa ETL
- etl/deafrica_dem_to_minio.py exports a DE Africa DEM for a district as a COG
  and uploads it to the LUSPA MinIO bucket raster-objects, then verifies the
  object is anonymously readable and range-capable. Credentials come from the
  environment; the existing PHP integration hardcodes them and an earlier key
  pair reached Gitea. NOTE: not yet run against the Sandbox — start with
  --list-products to confirm the DEM product name.

Documents
- Concept note: Digital Earth Africa added as a raster source (§6.3), separating
  the live WMS route from the batch Sandbox export; corrected the in-house
  contour table's provenance to OpenTopography (gdal_contour over an SRTM 30 m /
  Copernicus 30 m DEM), and added the ToR §2.4.2 / FS §2 alignment chapter.
- TWG presentation, architecture and two integration workflow charts (SVG
  sources kept in the repo so they stay editable), and a user guide for the
  Analyse tools.

Service worker v13 -> v14. .gitignore: exclude Python bytecode from etl/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-23 16:28:45 +02:00

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