329 lines
12 KiB
Go
329 lines
12 KiB
Go
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package geojson_test
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import (
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"encoding/json"
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"math"
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"testing"
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"time"
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"b612.me/astro/geojson"
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"b612.me/astro/internal/geodata"
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"b612.me/astro/internal/occultationgeo"
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"b612.me/astro/moon"
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)
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func TestMarshalStarOccultationAntares20240303UsesContinuousVisibleEnvelope(t *testing.T) {
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zone := time.FixedZone("UTC+8", 8*60*60)
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start := time.Date(2024, time.March, 3, 0, 0, 0, 0, zone)
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star := moon.StarCoordinate{
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ID: "HR 6134", RA: 247.35166667, Dec: -26.43194444,
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Epoch: time.Date(2000, time.January, 1, 12, 0, 0, 0, time.UTC),
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Frame: moon.CoordinateFrameJ2000,
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ProperMotionRACosDecMasPerYear: -10,
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ProperMotionDecMasPerYear: -20,
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ParallaxMas: 24,
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}
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paths, err := moon.FindStarOccultationPaths(
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start, start.Add(24*time.Hour), star,
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moon.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
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DisableFootprints: true, IncludeFootprintTimeline: true,
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FootprintTimelineStep: 5 * time.Minute,
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},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindStarOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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data, err := geojson.MarshalStarOccultation(paths[0])
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if err != nil {
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t.Fatalf("MarshalStarOccultation: %v", err)
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}
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collection := decodeCollection(t, data)
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band := featureWithRole(t, collection, "occultation-band")
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if band.Properties["static_band_authoritative"] != true {
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t.Fatalf("occultation-band source=%v authoritative=%v, want analytic authoritative boundary",
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band.Properties["source"], band.Properties["static_band_authoritative"])
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}
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for index, point := range paths[0].CenterLine {
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if !geometryContainsPoint(t, band.Geometry, point.Longitude, point.Latitude) {
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t.Fatalf("center-line sample %d lies outside visible band at %.6f, %.6f",
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index, point.Longitude, point.Latitude)
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}
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}
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for _, feature := range featuresWithRole(collection, "visibility-boundary") {
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var lines [][][]float64
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if err := json.Unmarshal(feature.Geometry.Coordinates, &lines); err != nil {
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t.Fatalf("decode visibility-boundary: %v", err)
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}
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for segmentIndex, line := range lines {
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for pointIndex, point := range line {
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if !geometryContainsPointWithinKM(t, band.Geometry, point[0], point[1], 2) {
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t.Fatalf("visibility-boundary segment %d point %d lies outside visible band at %.6f, %.6f",
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segmentIndex, pointIndex, point[0], point[1])
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}
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}
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}
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}
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assertOccultationBandMaximumEdge(t, band, 45)
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}
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func TestMarshalStarOccultationAntares20240303RetainsNarrowGreatestSetFold(t *testing.T) {
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start := time.Date(2024, time.March, 3, 0, 0, 0, 0, time.UTC)
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paths, err := moon.FindStarOccultationPaths(
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start, start.Add(24*time.Hour), antaresCoordinateForGeoJSONRegression(),
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moon.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
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DisableFootprints: true, IncludeFootprintTimeline: true,
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FootprintTimelineStep: 5 * time.Minute,
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},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindStarOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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var curve moon.OccultationRiseSetCurve
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for _, candidate := range paths[0].RiseSetCurves {
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if candidate.Phase == moon.RiseSetPhaseGreatest && candidate.Direction == moon.RiseSetDirectionSet {
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curve = candidate
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break
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}
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}
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if len(curve.Segments) < 2 {
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t.Fatalf("greatest/set segments=%d, want the narrow fold branch recovered at one-minute sampling", len(curve.Segments))
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}
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shared := false
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for first := 0; first < len(curve.Segments); first++ {
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for second := first + 1; second < len(curve.Segments); second++ {
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for _, left := range []moon.OccultationPathPoint{curve.Segments[first][0], curve.Segments[first][len(curve.Segments[first])-1]} {
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for _, right := range []moon.OccultationPathPoint{curve.Segments[second][0], curve.Segments[second][len(curve.Segments[second])-1]} {
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if left.Time.Sub(right.Time) < -time.Second || left.Time.Sub(right.Time) > time.Second {
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continue
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}
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if geojsonPointDistanceKM(left.Longitude, left.Latitude, right.Longitude, right.Latitude) <= 1 {
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shared = true
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}
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}
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}
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}
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}
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if !shared {
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t.Fatal("greatest/set fold branches do not share a physical endpoint")
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}
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data, err := geojson.MarshalStarOccultation(paths[0])
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if err != nil {
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t.Fatalf("MarshalStarOccultation: %v", err)
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}
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boundary := riseSetBoundaryFeature(t, decodeCollection(t, data), "greatest", "set")
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var lines [][][]float64
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if err := json.Unmarshal(boundary.Geometry.Coordinates, &lines); err != nil {
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t.Fatalf("decode greatest/set boundary: %v", err)
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}
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if len(lines) < 2 {
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t.Fatalf("serialized greatest/set segments=%d, want at least two folded branches", len(lines))
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}
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}
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func geojsonPointDistanceKM(firstLongitude, firstLatitude, secondLongitude, secondLatitude float64) float64 {
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const earthRadiusKM = 6378.1366
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const degreesToRadians = 3.141592653589793 / 180
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firstLat, secondLat := firstLatitude*degreesToRadians, secondLatitude*degreesToRadians
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deltaLat := (secondLatitude - firstLatitude) * degreesToRadians
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deltaLon := (secondLongitude - firstLongitude) * degreesToRadians
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a := math.Sin(deltaLat/2)*math.Sin(deltaLat/2) + math.Cos(firstLat)*math.Cos(secondLat)*math.Sin(deltaLon/2)*math.Sin(deltaLon/2)
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return 2 * earthRadiusKM * math.Asin(math.Sqrt(math.Max(0, math.Min(1, a))))
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}
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func TestMarshalStarOccultationAntaresRepresentative2022To2026Topology(t *testing.T) {
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star := antaresCoordinateForGeoJSONRegression()
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for _, date := range []string{
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"2023-09-21", // first event in the series; short temporal horizon closure
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"2023-10-18", // complete endpoint network without a temporal connector
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"2024-03-03", // original disconnected footprint-sweep regression
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"2024-06-20", // antimeridian split
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"2025-08-31", // multi-branch southern polar turn and numerical sliver
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"2026-02-11", // pole-enclosing equirectangular output
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"2026-12-08", // returning ordinary-latitude branch
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} {
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date := date
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t.Run(date, func(t *testing.T) {
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start, err := time.Parse("2006-01-02", date)
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if err != nil {
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t.Fatal(err)
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}
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paths, err := moon.FindStarOccultationPaths(
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start, start.Add(24*time.Hour), star,
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moon.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
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DisableFootprints: true, IncludeFootprintTimeline: true,
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FootprintTimelineStep: 5 * time.Minute,
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},
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)
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if err != nil || len(paths) != 1 {
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t.Fatalf("FindStarOccultationPaths() paths=%d err=%v, want one", len(paths), err)
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}
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path := paths[0]
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polygons, authoritative, err := occultationgeo.VisibleStarBandPolygonsFromAnalyticContours(
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path.BandFootprints, path.BandContours, path.VisibilityContours,
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path.NorthernLimit, path.SouthernLimit, path.RiseSetCurves,
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)
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if err != nil || !authoritative || len(polygons) != 1 {
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t.Fatalf("analytic polygons=%d authoritative=%v err=%v, want one physical band", len(polygons), authoritative, err)
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}
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assertOccultationPhysicalPolygonsMaximumEdge(t, polygons, 45)
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assertOccultationPhysicalPolygonsHaveNoShortHairpins(t, polygons, 35, 25, 12)
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if !geodata.SphericalPolygonsContainPathsWithinKM(
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polygons, occultationPathPointLines([][]moon.OccultationPathPoint{path.CenterLine}), false, 0.1,
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) {
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t.Fatalf("analytic band misses center line by %.3f km",
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geodata.SphericalPolygonsPathMissDistanceKM(
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polygons, occultationPathPointLines([][]moon.OccultationPathPoint{path.CenterLine}), false,
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))
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}
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phaseLines := make([][]geodata.GeoPoint, 0, len(path.RiseSetCurves))
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for _, curve := range path.RiseSetCurves {
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phaseLines = append(phaseLines,
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occultationPathPointLines(occultationgeo.StitchedRiseSetCurveSegments(curve))...,
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)
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}
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if !geodata.SphericalPolygonsContainPathsWithinKM(polygons, phaseLines, false, 2) {
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t.Fatalf("analytic band misses a displayed rise/set phase by %.3f km",
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geodata.SphericalPolygonsPathMissDistanceKM(polygons, phaseLines, false))
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}
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data, err := geojson.MarshalStarOccultation(path)
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if err != nil {
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t.Fatalf("MarshalStarOccultation: %v", err)
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}
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collection := decodeCollection(t, data)
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band := featureWithRole(t, collection, "occultation-band")
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if band.Properties["static_band_authoritative"] != true {
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t.Fatalf("occultation-band source=%v authoritative=%v",
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band.Properties["source"], band.Properties["static_band_authoritative"])
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}
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for index, point := range path.CenterLine {
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if !geometryContainsPointWithinKM(t, band.Geometry, point.Longitude, point.Latitude, 0.1) {
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t.Fatalf("GeoJSON band excludes center sample %d at %.6f, %.6f",
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index, point.Longitude, point.Latitude)
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}
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}
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})
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}
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}
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func antaresCoordinateForGeoJSONRegression() moon.StarCoordinate {
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return moon.StarCoordinate{
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ID: "HR 6134", RA: 247.35166667, Dec: -26.43194444,
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Epoch: time.Date(2000, time.January, 1, 12, 0, 0, 0, time.UTC),
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Frame: moon.CoordinateFrameJ2000,
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ProperMotionRACosDecMasPerYear: -10,
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ProperMotionDecMasPerYear: -20,
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ParallaxMas: 24,
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}
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}
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func occultationPathPointLines(sources [][]moon.OccultationPathPoint) [][]geodata.GeoPoint {
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result := make([][]geodata.GeoPoint, 0, len(sources))
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for _, source := range sources {
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if len(source) < 2 {
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continue
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}
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line := make([]geodata.GeoPoint, len(source))
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for index, point := range source {
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line[index] = geodata.GeoPoint{Longitude: point.Longitude, Latitude: point.Latitude}
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}
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result = append(result, line)
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}
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return result
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}
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func assertOccultationPhysicalPolygonsMaximumEdge(
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t *testing.T,
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polygons [][]geodata.GeoPoint,
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maximumKM float64,
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) {
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t.Helper()
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for polygonIndex, polygon := range polygons {
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for index := range polygon {
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next := (index + 1) % len(polygon)
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distance := geoJSONCoordinateDistanceKM(
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[]float64{polygon[index].Longitude, polygon[index].Latitude},
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[]float64{polygon[next].Longitude, polygon[next].Latitude},
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)
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if distance > maximumKM {
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t.Fatalf("physical polygon %d edge %d is %.1f km, want <=%.1f km",
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polygonIndex, index, distance, maximumKM)
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}
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}
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}
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}
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func assertOccultationPhysicalPolygonsHaveNoShortHairpins(
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t *testing.T,
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polygons [][]geodata.GeoPoint,
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maximumClosureKM, minimumDetourKM float64,
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maximumSpan int,
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) {
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t.Helper()
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for _, polygon := range polygons {
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ring := make([][]float64, len(polygon))
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for index, point := range polygon {
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ring[index] = []float64{point.Longitude, point.Latitude}
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}
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assertGeoJSONRingHasNoShortHairpins(
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t, "physical occultation-band", ring,
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maximumClosureKM, minimumDetourKM, maximumSpan,
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)
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}
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}
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func geometryContainsPointWithinKM(t *testing.T, value struct {
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Type string `json:"type"`
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Coordinates json.RawMessage `json:"coordinates"`
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Geometries json.RawMessage `json:"geometries"`
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}, longitude, latitude, toleranceKM float64) bool {
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if geometryContainsPoint(t, value, longitude, latitude) {
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return true
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}
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var polygons [][][][]float64
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if value.Type == "MultiPolygon" {
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if json.Unmarshal(value.Coordinates, &polygons) != nil {
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return false
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}
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} else if value.Type == "Polygon" {
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var polygon [][][]float64
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if json.Unmarshal(value.Coordinates, &polygon) != nil {
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return false
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}
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polygons = [][][][]float64{polygon}
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} else {
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return false
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}
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point := []float64{longitude, latitude}
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for _, polygon := range polygons {
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for _, ring := range polygon {
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for index := 1; index < len(ring); index++ {
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if geoJSONPointSegmentDistanceKM(point, ring[index-1], ring[index]) <= toleranceKM {
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return true
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}
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}
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}
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}
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return false
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}
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func assertOccultationBandMaximumEdge(t *testing.T, feature decodedFeature, maximumKM float64) {
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t.Helper()
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var polygons [][][][]float64
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if err := json.Unmarshal(feature.Geometry.Coordinates, &polygons); err != nil {
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t.Fatalf("decode %v polygons: %v", feature.Properties["role"], err)
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}
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for polygonIndex, polygon := range polygons {
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for ringIndex, ring := range polygon {
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for pointIndex := 1; pointIndex < len(ring); pointIndex++ {
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if distance := geoJSONCoordinateDistanceKM(ring[pointIndex-1], ring[pointIndex]); distance > maximumKM {
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t.Fatalf("%v polygon %d ring %d edge %d is %.1f km, want <= %.1f km",
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feature.Properties["role"], polygonIndex, ringIndex, pointIndex, distance, maximumKM)
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}
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}
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}
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}
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}
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