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package osmpass
import (
"database/sql"
"fmt"
"log/slog"
"strings"
"unicode"
"golang.org/x/text/unicode/norm"
)
const elevationToleranceM = 25
type osmPass struct {
Name string
Elevation *int
Latitude float64
Longitude float64
}
func EnrichMountainPasses(db *sql.DB) (int, error) {
osmPasses, err := loadOSMPasses(db)
if err != nil {
return 0, err
}
rows, err := db.Query(`
SELECT external_id, name, department_code, elevation
FROM mountain_passes
WHERE latitude IS NULL
`)
if err != nil {
return 0, err
}
unmatched := make([]struct {
ExternalID string
Name string
DepartmentCode string
Elevation int
}, 0)
for rows.Next() {
var candidate struct {
ExternalID string
Name string
DepartmentCode string
Elevation int
}
if err := rows.Scan(&candidate.ExternalID, &candidate.Name, &candidate.DepartmentCode, &candidate.Elevation); err != nil {
rows.Close()
return 0, err
}
unmatched = append(unmatched, candidate)
}
if err := rows.Err(); err != nil {
rows.Close()
return 0, err
}
rows.Close()
statement, err := db.Prepare(`
UPDATE mountain_passes SET latitude = ?, longitude = ? WHERE external_id = ?
`)
if err != nil {
return 0, err
}
defer statement.Close()
count := 0
for _, candidate := range unmatched {
matched := matchToOSM(candidate.Name, candidate.DepartmentCode, candidate.Elevation, osmPasses)
if matched == nil {
continue
}
if _, err := statement.Exec(matched.Latitude, matched.Longitude, candidate.ExternalID); err != nil {
return count, err
}
count++
}
slog.Info("Enriched mountain passes with coordinates", "count", count)
return count, nil
}
func loadOSMPasses(db *sql.DB) ([]osmPass, error) {
rows, err := db.Query(`
SELECT name, elevation, latitude, longitude
FROM osm_passes
WHERE elevation IS NOT NULL
`)
if err != nil {
return nil, err
}
defer rows.Close()
osmPasses := make([]osmPass, 0)
for rows.Next() {
var mountainPass osmPass
var name sql.NullString
var elevation sql.NullInt64
if err := rows.Scan(&name, &elevation, &mountainPass.Latitude, &mountainPass.Longitude); err != nil {
return nil, err
}
mountainPass.Name = name.String
if elevation.Valid {
elevationValue := int(elevation.Int64)
mountainPass.Elevation = &elevationValue
}
osmPasses = append(osmPasses, mountainPass)
}
return osmPasses, rows.Err()
}
func matchToOSM(name, departmentCode string, elevation int, osmPasses []osmPass) *osmPass {
bbox := departmentBBox(departmentCode)
var best *osmPass
bestNameMatch := false
bestElevationDiff := 0.0
for i := range osmPasses {
candidate := &osmPasses[i]
if candidate.Elevation == nil {
continue
}
if !bbox.Contains(candidate.Latitude, candidate.Longitude) {
continue
}
elevationDiff := absFloat64(float64(elevation) - float64(*candidate.Elevation))
if elevationDiff > elevationToleranceM {
continue
}
nameMatch := nameMatches(name, candidate.Name)
if best == nil ||
(nameMatch && !bestNameMatch) ||
(nameMatch == bestNameMatch && elevationDiff < bestElevationDiff) {
best = candidate
bestNameMatch = nameMatch
bestElevationDiff = elevationDiff
}
}
if best == nil {
return nil
}
if bestNameMatch {
return best
}
for i := range osmPasses {
candidate := &osmPasses[i]
if candidate == best || candidate.Elevation == nil {
continue
}
if !bbox.Contains(candidate.Latitude, candidate.Longitude) {
continue
}
if absFloat64(float64(elevation)-float64(*candidate.Elevation)) <= bestElevationDiff+30 {
return nil
}
}
return best
}
type bbox struct {
minLat, minLon, maxLat, maxLon float64
}
func (b bbox) Contains(latitude, longitude float64) bool {
return latitude >= b.minLat && latitude <= b.maxLat &&
longitude >= b.minLon && longitude <= b.maxLon
}
func departmentBBox(departmentCode string) bbox {
switch departmentCode {
case "01":
return bbox{minLat: 45.5, minLon: 4.7, maxLat: 46.6, maxLon: 6.3}
case "06":
return bbox{minLat: 43.5, minLon: 6.4, maxLat: 44.5, maxLon: 7.8}
case "13":
return bbox{minLat: 43.1, minLon: 4.4, maxLat: 44.0, maxLon: 6.0}
default:
return bbox{minLat: 41.0, minLon: -6.0, maxLat: 52.0, maxLon: 10.0}
}
}
func nameMatches(centName, osmName string) bool {
cent := normalizeName(centName)
osm := normalizeName(osmName)
if cent == osm {
return true
}
centTokens := tokenize(cent)
if len(centTokens) < 3 {
return false
}
osmTokens := make(map[string]bool)
for _, token := range tokenize(osm) {
osmTokens[token] = true
}
for _, token := range centTokens {
if !osmTokens[token] {
return false
}
}
return true
}
func tokenize(name string) []string {
return strings.Fields(name)
}
func normalizeName(name string) string {
name = strings.ToLower(name)
name = norm.NFD.String(name)
normalized := strings.Builder{}
previousSpace := false
for _, r := range name {
if unicode.Is(unicode.Mn, r) {
continue
}
if unicode.IsLetter(r) || unicode.IsDigit(r) {
normalized.WriteRune(r)
previousSpace = false
} else if !previousSpace {
normalized.WriteRune(' ')
previousSpace = true
}
}
return strings.TrimSpace(normalized.String())
}
func absFloat64(value float64) float64 {
if value < 0 {
return -value
}
return value
}
func (p osmPass) String() string {
if p.Elevation == nil {
return fmt.Sprintf("%s @ unknown elevation", p.Name)
}
return fmt.Sprintf("%s @ %dm", p.Name, *p.Elevation)
}
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