Скачать или смотреть How to Explode Lines and Determine Lengths of Lines using QGIS

Steps in QGIS
1. Connect Points with Lines
• Using the "Points to Path" Tool:
1. Go to Processing Toolbox (Ctrl+Alt+T).
2. Search for Points to Path and open the tool.
3. Select your point layer as the input layer.
4. Use a field (if available) to determine the order of connection (e.g., an ID or sequence field). If no such field exists, it will connect the points in the order they are stored.
5. Run the tool to generate a polyline layer connecting the points.
2. Use the "Explode Lines" Tool
This tool will split a multi-segment line into individual line segments.
1. Open the Processing Toolbox (Ctrl+Alt+T).
2. Search for Explode Lines and run the tool.
3. Select your line layer as the input.
4. The output will have one feature (line) for each segment between points.
3. Calculate Distances
1. Open the attribute table of the exploded line layer.
2. Use the Field Calculator (the calculator icon).
3. Add a new field (e.g., "Distance") and use the expression:
length($geometry)
4. Click OK to run.