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improve elevation gain computation

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This commit is contained in:
vcoppe
2025-11-15 08:39:42 +01:00
parent 7a72f44722
commit bd307daa57
1 changed files with 47 additions and 29 deletions
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76
gpx/src/gpx.ts
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@@ -835,21 +835,6 @@ export class TrackSegment extends GPXTreeLeaf {
statistics.local.distance.total.push(statistics.global.distance.total);
// elevation
if (i > 0) {
const ele =
statistics.local.elevation.smoothed[i] -
statistics.local.elevation.smoothed[i - 1];
if (ele > 0) {
statistics.global.elevation.gain += ele;
} else if (ele < 0) {
statistics.global.elevation.loss -= ele;
}
}
statistics.local.elevation.gain.push(statistics.global.elevation.gain);
statistics.local.elevation.loss.push(statistics.global.elevation.loss);
// time
if (points[i].time === undefined) {
statistics.local.time.total.push(0);
@@ -960,8 +945,7 @@ export class TrackSegment extends GPXTreeLeaf {
}
}
[statistics.local.slope.segment, statistics.local.slope.length] =
this._computeSlopeSegments(statistics);
this._elevationComputation(statistics);
statistics.global.time.total =
statistics.global.time.start && statistics.global.time.end
@@ -1026,30 +1010,64 @@ export class TrackSegment extends GPXTreeLeaf {
);
}
_computeSlopeSegments(statistics: GPXStatistics): [number[], number[]] {
_elevationComputation(statistics: GPXStatistics) {
let simplified = ramerDouglasPeucker(
this.trkpt,
20,
5,
getElevationDistanceFunction(statistics)
);
let slope = [];
let length = [];
for (let i = 0; i < simplified.length - 1; i++) {
let start = simplified[i].point._data.index;
let end = simplified[i + 1].point._data.index;
let dist =
statistics.local.distance.total[end] - statistics.local.distance.total[start];
let ele = (simplified[i + 1].point.ele ?? 0) - (simplified[i].point.ele ?? 0);
for (let j = start; j < end + (i + 1 === simplified.length - 1 ? 1 : 0); j++) {
slope.push((0.1 * ele) / dist);
length.push(dist);
const ele = this.trkpt[end].ele - this.trkpt[start].ele || 0;
const dist =
statistics.local.distance.total[end] - statistics.local.distance.total[start];
for (let j = start; j < end + (i + 1 == simplified.length - 1 ? 1 : 0); j++) {
const localDist =
statistics.local.distance.total[j] - statistics.local.distance.total[start];
const localEle = dist > 0 ? (localDist / dist) * ele : 0;
statistics.local.elevation.gain.push(
statistics.global.elevation.gain + localEle > 0 ? localEle : 0
);
statistics.local.elevation.loss.push(
statistics.global.elevation.loss + localEle < 0 ? localEle : 0
);
}
if (ele > 0) {
statistics.global.elevation.gain += ele;
} else if (ele < 0) {
statistics.global.elevation.loss -= ele;
}
}
return [slope, length];
let slope = [];
let length = [];
for (let a = 0; a < simplified.length - 1; ) {
let b = a + 1;
while (b < simplified.length - 1 && simplified[b].distance < 20) {
b++;
}
let start = simplified[a].point._data.index;
let end = simplified[b].point._data.index;
let dist =
statistics.local.distance.total[end] - statistics.local.distance.total[start];
let ele = (simplified[b].point.ele ?? 0) - (simplified[a].point.ele ?? 0);
for (let j = start; j < end + (b === simplified.length - 1 ? 1 : 0); j++) {
slope.push((0.1 * ele) / dist);
length.push(dist);
}
a = b;
}
statistics.local.slope.segment = slope;
statistics.local.slope.length = length;
}
getNumberOfTrackPoints(): number {