Modify the existing callsign exclusion to:
1. Only exclude DX stations, instead of both DE and DX
2. Treat the entered callsign as prefix, instead of matching any substring
e.g. excluding "VE" now excludes 'VE3ABC' but not 'K3VE'
Fix: Improve earthquake coordinate handling and add debugging
Fixed a major bug with how the earthquakes icons are displayed.
some tweaks to Grayline as well.
The edge closure was creating an incorrect polygon connecting
across the bottom of the map. Reverted to simple polygon creation
between upper and lower segments.
Need different approach for wrapping.
Added logic to detect segments at ±180° boundaries and close them
by extending to map edge coordinates. This ensures polygons appear
to wrap by filling the space all the way to the map boundary.
Segments near -180° or +180° now have corner points added at the
respective longitude boundary to create closed polygons.
Changed splitting strategy to ensure segments overlap at the split point.
This prevents gaps between western and eastern hemisphere segments.
Uses sorted points and midpoint splitting with 1-point overlap.
When a line spans the full 360° from -180 to 180 with no jumps,
the previous logic couldn't detect the date line crossing.
Solution: Detect full-world span (>350°) and split at longitude 0,
creating separate segments for western (-180 to 0) and eastern
(0 to 180) hemispheres.
This ensures the Enhanced DX Zone polygon wraps correctly.
Changed from complex segment matching to simple index-based pairing.
Added debug logging to diagnose segment creation.
Since both upper and lower lines are generated with the same longitude
points and split at the same positions, corresponding segments should
have the same index.
The Enhanced DX Zone polygon was not wrapping across the ±180° date line.
Solution:
- Split both upper (+5°) and lower (-5°) twilight lines at date line
- Match corresponding segments by longitude overlap
- Create separate polygons for each matched segment pair
- Falls back to single polygon when no date line crossing occurs
Result: Enhanced DX Zone now wraps continuously across the entire map
TWO ISSUES FIXED:
1. Lines stopping at ±180° (international date line):
- Added splitAtDateLine() function to detect date line crossings
- Split polylines into segments when longitude jumps > 180°
- Each segment renders separately, avoiding lines cutting across map
2. Random lines to Arctic (twilight zones):
- Improved Newton-Raphson convergence checking
- Added convergence validation before using calculated points
- Stricter latitude clamping to ±85° to avoid polar discontinuities
- Skip points near solstices where sun is directly over tropics
- Filter out points with extreme latitudes (>85°) that cause artifacts
- Validate enhanced DX zone has enough points before creating polygon
Technical improvements:
- More robust iterative solver for twilight zone calculations
- Better handling of edge cases (equinox, solstice, polar regions)
- Increased Newton-Raphson iterations from 5 to 10 for better accuracy
- Added constraints during iteration to keep latitude in valid range
Result: Clean, continuous lines across all longitudes including date line,
no erratic lines near poles or Arctic regions.
ROOT CAUSE IDENTIFIED:
The popup was appearing in the correct location (Japan) but the icon
was appearing elsewhere (Australia). This proved the marker position
was CORRECT but the icon visual was being offset.
PROBLEM:
CSS rule 'position: relative !important' on .earthquake-icon was
breaking Leaflet's marker positioning, causing icons to render far
from their actual marker positions.
SOLUTION:
- Removed 'position: relative' from .earthquake-icon CSS
- Removed 'position: relative' from .earthquake-icon div CSS
- Reverted to standard [lat, lon] format (popup confirmed this is correct)
The popups appearing in correct locations proved:
- Coordinate extraction is correct: lat=coords[1], lon=coords[0]
- Marker positioning is correct: L.marker([lat, lon])
- Only the icon visual rendering was broken by CSS
This explains why the issue persisted regardless of [lat,lon] vs [lon,lat]
testing - the CSS was always breaking the icon positioning.
CONFIRMED WITH USER TESTING:
- Japan earthquake (37.6°N, 142.4°E) now appears in Japan ✓
- Previously was appearing near Tasmania with [lat, lon] format
This application uses non-standard Leaflet coordinate format [lon, lat]
instead of the standard [lat, lon]. This is unusual but confirmed working.
Test cases verified:
- Japan (37.6°N, 142.4°E): Now plots in Japan ✓
- Dominican Republic (18.0°N, 68.6°W): Should plot in Caribbean
- Russia/Kamchatka (~56°N, ~162°E): Should plot in eastern Russia
Changes:
- L.marker([lat, lon]) → L.marker([lon, lat])
- L.circle([lat, lon]) → L.circle([lon, lat])
- Updated debug logging to show [lon, lat] format
- Added detailed console output for verification
The debug logging was showing the old [lon, lat] format even though
the actual marker call was using [lat, lon]. This was confusing!
Updated:
- leafletMarkerCall log now shows [lat, lon] format
- Explanation updated to say 'Standard Leaflet format'
The actual code is correct and using [lat, lon].
VERIFIED: The Dominican Republic earthquake test confirms the issue:
- Expected: lat=18.0365°N, lon=-68.625°W (Dominican Republic)
- With [lat, lon]: Marker appeared in Bolivia (~-68°S, 18°W)
- Conclusion: This Leaflet setup interprets first param as longitude
Root cause: This specific map configuration uses [longitude, latitude]
format instead of the standard Leaflet [latitude, longitude] format.
Changes:
- L.marker([lat, lon]) → L.marker([lon, lat])
- L.circle([lat, lon]) → L.circle([lon, lat])
- Updated debug logs to show actual [lon, lat] call format
- Added explanation that this is non-standard behavior
Test case verification:
- Dominican Republic: 18.0365°N, -68.625°W
- Should plot in Caribbean (not Bolivia)
- Russia: ~56°N, ~162°E
- Should plot in Kamchatka (not Europe)
- Peru: ~-15°S, ~-70°W
- Should plot in Peru (not Antarctica)
Issue: Markers were moving when zooming and appearing off-screen, indicating
coordinate system mismatch.
Changes:
- Reverted L.marker() and L.circle() to use standard [lat, lon] format
- Enhanced debug logging to show:
* GeoJSON format with labeled coordinates
* Extracted lat/lon with source indices
* Actual Leaflet marker call format
* Explanation of coordinate system
- Added clearer marker creation log
The standard Leaflet coordinate format is [latitude, longitude]:
- Latitude: -90 to +90 (South to North)
- Longitude: -180 to +180 (West to East)
This should fix markers drifting when zooming and appearing outside map bounds.
The markers were appearing in completely wrong locations:
- Peru earthquakes showing in Antarctica
- Russia earthquakes showing in Northern Europe
Root cause: The L.marker() and L.circle() calls need [lon, lat] order
instead of the standard Leaflet [lat, lon] format for this specific setup.
Changes:
- L.marker([lat, lon]) → L.marker([lon, lat])
- L.circle([lat, lon]) → L.circle([lon, lat])
This ensures earthquakes plot at their correct geographic locations.
- Added comprehensive comments explaining GeoJSON format [longitude, latitude, elevation]
- Added debug logging to verify coordinate extraction and marker placement
- Clarified variable extraction from coords array with inline comments
- Improved console.log to explicitly label lat and lon values
- Code correctly uses Leaflet's expected [latitude, longitude] format for markers
The coordinate handling is correct per GeoJSON and Leaflet standards:
- GeoJSON provides: [lon, lat, elevation]
- Code extracts: lat = coords[1], lon = coords[0]
- Leaflet receives: L.marker([lat, lon]) which is [latitude, longitude]
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Rich Freedman
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