b612
044f2f4381
- 新增半解析、旧模型、自定义与多源堆叠星历实例，提供 Context、Instance、SPK 读取及状态与视位置计算 - 统一太阳、月球和行星实例接口，扩展黄经穿越、留、相位、最近角距、偕日可见、任意高度升落、轨道节点及凌日等天象查询 - 完善日月食、月掩与凌日的月缘剖面、有限盘面接触、站心修正、局地可见性、全球路径和地图输出 - 新增 SVG、GeoJSON、KML 天象输出及凌日、月掩和月缘地形相关缓存与几何求解 - 新增恒星星表导入与查询，支持 CSV、Hipparcos、BSC5、Stellarium 等格式及名称、交叉标识、锥面检索和星等过滤 - 补充 IAU 2006、地球定向、折射消光、大气观测、轨道传播及半解析行星/月球数据支持 - 将默认未来民用时标切换为 TimeScaleLeapHour，更新 2027–2400 农历速查表、中文日期解析和时区边界处理 - 增加事件基线、跨模型回归、几何边界、月缘地形和输出契约测试，完善中英文手册、示例资源、NOTICE 与忽略规则
78 lines
3.0 KiB
Go
78 lines
3.0 KiB
Go
package basic
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import (
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"math"
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"time"
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"b612.me/astro/internal/geodata"
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)
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// occultationStationDensifyContours applies the map's projection metric after
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// station correction. The correction can move adjacent geocentric samples by
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// tens of kilometres, so a contour that was dense before correction can still
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// contain a long Web Mercator chord. A spatial arclength plane selects the
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// midpoint branch even where time reverses and a fixed-time solve is singular.
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// The refined curve is split again at time folds for the public time contract.
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func occultationStationDensifyContours(
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contours [][]OccultationPathPoint,
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cache *occultationRiseSetEvaluationCache,
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location *time.Location,
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) [][]OccultationPathPoint {
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if len(contours) == 0 || cache == nil {
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return contours
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}
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const (
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targetSpacingKM = 30.0
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maxDepth = 10
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)
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result := make([][]OccultationPathPoint, 0, len(contours))
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for _, contour := range contours {
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if len(contour) < 2 {
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continue
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}
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var refine func(OccultationPathPoint, OccultationPathPoint, int, *[]OccultationPathPoint)
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refine = func(start, end OccultationPathPoint, depth int, output *[]OccultationPathPoint) {
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if depth >= maxDepth || occultationStationProjectedSpacingKM(start, end) <= targetSpacingKM {
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*output = append(*output, end)
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return
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}
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startTT, endTT := centerTimeTT(start.Time), centerTimeTT(end.Time)
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chord := [3]float64{math.Remainder(end.Longitude-start.Longitude, 360), end.Latitude - start.Latitude,
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(endTT - startTT) * occultationStationEnvelopeTimeScale}
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length := math.Sqrt(dotSolarEclipse3(chord, chord))
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if length <= 1e-12 {
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*output = append(*output, end)
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return
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}
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predictor := [3]float64{start.Longitude + chord[0]/2, start.Latitude + chord[1]/2, chord[2] / 2}
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for index := range chord {
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chord[index] /= length
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}
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midpoint, _, ok := occultationStationCorrectEnvelopeArc(predictor, chord, startTT, cache,
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occultationStationEnvelopeModel{kind: occultationStationContactEnvelope}, (start.WidthKM+end.WidthKM)/2, location)
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if ok && occultationPathDistanceKM(start, midpoint.point) < occultationPathDistanceKM(start, end) &&
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occultationPathDistanceKM(midpoint.point, end) < occultationPathDistanceKM(start, end) {
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refine(start, midpoint.point, depth+1, output)
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refine(midpoint.point, end, depth+1, output)
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return
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}
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// Leave a failed local solve untouched. Retrying with an unrelated
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// branch would be less accurate than retaining the source sample.
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*output = append(*output, end)
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}
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refined := []OccultationPathPoint{contour[0]}
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for index := 1; index < len(contour); index++ {
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refine(refined[len(refined)-1], contour[index], 0, &refined)
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}
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result = append(result, occultationStationSplitEnvelopeAtTimeFolds(refined)...)
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}
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return result
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}
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func occultationStationProjectedSpacingKM(first, second OccultationPathPoint) float64 {
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return geodata.WebMercatorDistanceKM(
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geodata.GeoPoint{Longitude: first.Longitude, Latitude: first.Latitude},
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geodata.GeoPoint{Longitude: second.Longitude, Latitude: second.Latitude},
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)
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}
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