Add gpx-anomalies command

cmd/gpx-anomalies/main.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"os"
+
+	"github.com/fofanov/go-osgb"
+	"github.com/twpayne/go-gpx"
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	log.SetFlags(0)
+	app := &cli.App{
+		Name:  "gpx-anomalies",
+		Usage: "Find repeated points in a GPX track",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:     "gpx-file",
+				Aliases:  []string{"g"},
+				Usage:    "Name of GPX file to process",
+				Required: true,
+			},
+			&cli.Float64Flag{
+				Name:    "fuzz",
+				Aliases: []string{"f"},
+				Usage:   "Consider two points coincident if they are within FUZZ kilometres of each other",
+				Value:   0.005,
+			},
+			&cli.Float64Flag{
+				Name:    "min-distance",
+				Aliases: []string{"min"},
+				Usage:   "Only show repeats that appear at least MIN kilometers apart",
+				Value:   0.1,
+			},
+			&cli.Float64Flag{
+				Name:    "max-distance",
+				Aliases: []string{"max"},
+				Usage:   "Do not show repeats that appear more than MAX kilometers apart",
+				Value:   5.0,
+			},
+		},
+		Action: func(c *cli.Context) error {
+			points, err := readGPXTrack(c.String("gpx-file"))
+			if err != nil {
+				log.Fatal(err)
+			}
+			findDuplicates(
+				points,
+				c.Float64("fuzz")*1000.0,
+				c.Float64("min-distance")*1000.0,
+				c.Float64("max-distance")*1000.0,
+			)
+			return nil
+		},
+	}
+	if err := app.Run(os.Args); err != nil {
+		log.Fatal(err)
+	}
+
+}
+
+func findDuplicates(points []RoutePoint, fuzz, minDist, maxDist float64) {
+	for i := range points {
+		p := points[i]
+		for j := i + 1; j < len(points); j++ {
+			q := points[j]
+			if p.Distance == q.Distance {
+				continue
+			}
+			d := euclideanDistance(p.Coordinate, q.Coordinate)
+			D := q.Distance - p.Distance
+			if d < fuzz && D > minDist && D < maxDist {
+				fmt.Printf("Point (%0.f, %0.f) revisited at %0.2f km and %0.2f km\n",
+					p.Coordinate.Easting, p.Coordinate.Northing, p.Distance/1000.0, q.Distance/1000.0)
+			}
+		}
+	}
+}
+
+func euclideanDistance(p, q *osgb.OSGB36Coordinate) float64 {
+	x := p.Easting - q.Easting
+	y := p.Northing - q.Northing
+	return math.Sqrt(x*x + y*y)
+}
+
+func readGPXTrack(filename string) ([]RoutePoint, error) {
+	r, err := os.Open(filename)
+	if err != nil {
+		return nil, fmt.Errorf("error opening %s for reading: %v", filename, err)
+	}
+	defer r.Close()
+	g, err := gpx.Read(r)
+	if err != nil {
+		return nil, fmt.Errorf("error reading GPS track %s: %v", filename, err)
+	}
+	trans, err := osgb.NewOSTN15Transformer()
+	if err != nil {
+		return nil, fmt.Errorf("error constructing coordinate transformer: %v", err)
+	}
+	distance := 0.0
+	var prevPoint *osgb.OSGB36Coordinate
+	var points []RoutePoint
+	for _, trk := range g.Trk {
+		for _, seg := range trk.TrkSeg {
+			for _, trkPt := range seg.TrkPt {
+				gpsCoord := osgb.NewETRS89Coord(trkPt.Lon, trkPt.Lat, trkPt.Ele)
+				p, err := trans.ToNationalGrid(gpsCoord)
+				if err != nil {
+					return nil, fmt.Errorf("error converting coordinates to National Grid: %v", err)
+				}
+				if prevPoint != nil {
+					distance += euclideanDistance(prevPoint, p)
+				}
+				points = append(points, RoutePoint{
+					Coordinate: p,
+					Distance:   distance,
+				})
+				prevPoint = p
+			}
+		}
+	}
+	return points, nil
+}
+
+type RoutePoint struct {
+	Coordinate *osgb.OSGB36Coordinate
+	Distance   float64
+}

go.mod

@@ -3,12 +3,14 @@ module github.com/ray1729/gpx-utils
 go 1.13
 
 require (
-	github.com/d4l3k/messagediff v1.2.1 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/dhconnelly/rtreego v1.0.0
 	github.com/fofanov/go-osgb v0.0.0-20170711141822-6893d1f95cd9
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/twpayne/go-geom v1.3.6 // indirect
 	github.com/twpayne/go-gpx v1.2.0
-	github.com/wlbr/mule v0.0.0-20200329114911-0724e1639b62 // indirect
+	github.com/urfave/cli/v2 v2.3.0
-	golang.org/x/net v0.0.0-20201201195509-5d6afe98e0b7 // indirect
+	github.com/wlbr/mule v0.0.0-20200517121540-6f9faa2e2d0b // indirect
-	golang.org/x/text v0.3.4 // indirect
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
+	golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1 // indirect
 )

go.sum

@@ -1,4 +1,5 @@
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/DATA-DOG/go-sqlmock v1.3.2/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
@@ -7,8 +8,12 @@ github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jB
 github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
 github.com/cenkalti/backoff/v3 v3.0.0/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=
 github.com/containerd/continuity v0.0.0-20190827140505-75bee3e2ccb6/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
-github.com/d4l3k/messagediff v1.2.1/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
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+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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 github.com/dhconnelly/rtreego v1.0.0/go.mod h1:SDozu0Fjy17XH1svEXJgdYq8Tah6Zjfa/4Q33Z80+KM=
@@ -32,7 +37,14 @@ github.com/opencontainers/image-spec v1.0.1/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zM
 github.com/opencontainers/runc v1.0.0-rc9/go.mod h1:qT5XzbpPznkRYVz/mWwUaVBUv2rmF59PVA73FjuZG0U=
 github.com/ory/dockertest/v3 v3.6.0/go.mod h1:4ZOpj8qBUmh8fcBSVzkH2bws2s91JdGvHUqan4GHEuQ=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
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+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
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@@ -41,31 +53,32 @@ github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/twpayne/go-geom v1.0.0 h1:ARrRnN4+rBX3LZFZQy9NFeXXlgQqVL4OOvAcnLdgy2g=
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-github.com/twpayne/go-gpx v1.1.1 h1:vbg0lRc/ZKSu8ev84/hJWZtplKJdBbucNmks4TNzSqQ=
-github.com/twpayne/go-gpx v1.1.1/go.mod h1:fQ+EsiFNgDuErUYyI0ZOgZPB+ACxW58L16oormty798=
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@@ -74,16 +87,23 @@ golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7w
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