Turbo GPX allows you to choose from multiple slope calculation
methods depending on the purpose.
Slope is calculated from distance and elevation included in the
GPX data.
Therefore, if the original GPX data contains elevation
fluctuation, missing values, or position jumps, the calculation
result is also affected.
About Gap
Gap is the maximum allowed distance between GPX points.
If the distance between points exceeds Gap, that section is treated as having points that are too far apart.
This helps prevent unnatural slope values caused by GPS loss or
position jumps.
| Parameter | Description |
|---|---|
| Gap | Maximum allowed distance between GPX points. If the distance between points exceeds Gap, that section is treated as having points that are too far apart. |
RAW
Calculates slope directly from the elevation difference and distance difference between GPX points.
Because it uses the distance and elevation difference from the previous point to the current point, it directly reflects changes in the source data.
It is easily affected by elevation fluctuation and GPS noise,
so values may change sharply.
| Parameter | Description |
|---|---|
| Gap | Maximum allowed distance between GPX points. If the distance between points exceeds Gap, no new slope is calculated for that section and the previous slope is carried forward. |
Use this when you want to check slope values close to the original data.
SMOOTH
Calculates slope after smoothing elevation.
Compared with RAW, slope fluctuation is reduced and the overall trend becomes easier to read.
However, short climbs or sudden changes may appear weaker.
| Parameter | Description |
|---|---|
| Window | Number of points used for smoothing. A larger value makes slope changes smoother. |
| Gap | Maximum allowed distance between GPX points. If the distance between points exceeds Gap, no new slope is calculated for that section and the previous slope is carried forward. |
Use this when you want to suppress small slope fluctuations and check the overall trend.
DISTANCE
Calculates the average slope for each specified distance.
Because it is based on a fixed distance instead of each point, it produces more stable slope values than RAW.
Points within the same section are assigned the same average slope.
| Parameter | Description |
|---|---|
| Distance | Section distance used to calculate slope. For example, if 100 m is specified, the average slope is calculated from the elevation difference over approximately every 100 m. |
| Gap | Maximum allowed distance between GPX points. If Gap is exceeded while creating a Distance section, the section is split there. |
Use this when you want to compare slope by fixed distance sections.
SEGMENT
Groups sections where elevation changes and calculates the average slope for each section.
Very short sections are not used as-is. They are treated as slope sections only after reaching a certain distance.
All points within a section are assigned the same average slope.
Use this when you want to group elevation changes into sections and check the average slope of each section.
CHART
This calculation method is used for slope chart display.
It interpolates elevation by distance, smooths the elevation, and then calculates slope for the chart.
Because it is intended for easy-to-read chart display, the calculation concept differs from the slope used for normal list display.
Use this when you want to check changes in slope across the whole route as a chart.