Initial commit — QGIS S-57 Converter

poc_wabasso.py

@@ -0,0 +1,65 @@
+"""
+PoC: produce a minimal valid S-57 .000 for the Wabasso test area and verify it
+opens cleanly with fiona (i.e., GDAL's S-57 driver).
+
+Expected result: fiona.listlayers() shows M_COVR + BOYLAT (and no warnings about
+broken bounds), and bounds match the envelope we encoded.
+"""
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).parent))
+from s57_writer import (
+    S57Cell, OBJL_M_COVR, OBJL_BOYLAT,
+    ATTL_CATCOV, ATTL_CATLAM,
+)
+
+# Wabasso area envelope (lon, lat):
+W, S, E, N = -80.4588, 27.7519, -80.4574, 27.7609
+
+OUTPUT = Path(__file__).parent / "test_wabasso.000"
+
+cell = S57Cell(
+    dsnm="TESTPOC.000",
+    edition=1,
+    intu=5,             # Harbour
+    scale=10000,
+    agen=999,
+    comt="QGISS57Converter PoC",
+    issue_date="20260428",
+)
+
+# 1) Mandatory M_COVR feature: rectangular envelope, CATCOV=1 (data covered)
+cell.add_area_feature(
+    objl=OBJL_M_COVR,
+    ring=[(W, S), (E, S), (E, N), (W, N), (W, S)],
+    attrs=[(ATTL_CATCOV, "1")],   # CATCOV=1 (coverage present)
+)
+
+# 2) One BOYLAT (lateral buoy, port hand IALA-B = CATLAM=1) at the centre
+cx = (W + E) / 2
+cy = (S + N) / 2
+cell.add_point_feature(
+    objl=OBJL_BOYLAT,
+    lon=cx, lat=cy,
+    attrs=[(ATTL_CATLAM, "1")],   # CATLAM=1 (port-hand lateral mark)
+)
+
+cell.write(OUTPUT)
+print(f"Wrote {OUTPUT} ({OUTPUT.stat().st_size} bytes)")
+
+# ── Verify with fiona ────────────────────────────────────────────────────────
+print()
+print("Verifying with fiona...")
+try:
+    import fiona
+    layers = fiona.listlayers(str(OUTPUT))
+    print(f"  fiona.listlayers: {layers}")
+    for L in layers:
+        try:
+            with fiona.open(str(OUTPUT), layer=L) as src:
+                print(f"    {L:10s}  bounds={src.bounds}  features={len(src)}")
+        except Exception as e:
+            print(f"    {L}: open ERROR: {e}")
+except Exception as e:
+    print(f"  fiona import or listlayers failed: {e}")