How to use

• Data source — Selects which FixOnly / combined file to load. Changing it reloads the data automatically. Real vs raw GPS loads the OSM reference polyline (Openstreetmap-reference-data_latlon_by_time.txt) together with raw fixes (yürümece-gnss_FixOnly.txt); use the checkboxes to hide either layer.
• Reload selected file — Re-reads the currently selected file (refresh).
• Visualization method: Original shows individual points; Heat Map our idea is a blue grid / density heatmap (or route + hover preview when the path moves enough); Heat Map (Blue-Green-Red) is a soft density map with a blue → green → red scale; GPS Uncertainty (rings + color) draws semi-transparent circles by horizontal accuracy (color: green = good → red = poor) and scales the center dot by vertical accuracy.
• Heatmap cell size — Cell size for the blue Heat Map our idea grid mode (larger = more blocky).
• If the distance between the first and last fix is greater than 30 m, the track is a dark red line. Moving the mouse near the line shows a preview for the i±7 window (circle + heat). Current preview radius is that circle’s radius in meters.
• Map tiles need internet. To load files from data/, open this page via a local server (python3 -m http.server).