449 lines
12 KiB
Go
449 lines
12 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"encoding/binary"
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"encoding/csv"
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"errors"
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"flag"
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"fmt"
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"log"
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"math"
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"os"
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"strings"
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"time"
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"weatherstation/internal/database"
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)
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type stationInfo struct {
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ID string
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Alias string
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Lat float64
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Lon float64
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Z int
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Y int
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X int
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}
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type tileRec struct {
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DT time.Time
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Width, Height int
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West, South float64
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East, North float64
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ResDeg float64
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Data []byte
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}
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func main() {
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var stationID string
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var startStr string
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var endStr string
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var outPath string
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var verbose bool
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flag.StringVar(&stationID, "station_id", "", "站点ID（留空表示全部WH65LP且有经纬度的站）")
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flag.StringVar(&startStr, "start", "", "起始时间（YYYY-MM-DD HH:MM:SS，CST）")
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flag.StringVar(&endStr, "end", "", "结束时间（YYYY-MM-DD HH:MM:SS，CST）")
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flag.StringVar(&outPath, "out", "radar_stats.csv", "输出CSV文件路径")
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flag.BoolVar(&verbose, "info", false, "输出详细过程信息")
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flag.Parse()
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if strings.TrimSpace(startStr) == "" || strings.TrimSpace(endStr) == "" {
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log.Fatalln("必须提供 --start 与 --end，格式 YYYY-MM-DD HH:MM:SS")
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}
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loc, _ := time.LoadLocation("Asia/Shanghai")
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if loc == nil {
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loc = time.FixedZone("CST", 8*3600)
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}
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startT, err := time.ParseInLocation("2006-01-02 15:04:05", startStr, loc)
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if err != nil {
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log.Fatalf("解析 start 失败: %v", err)
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}
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endT, err := time.ParseInLocation("2006-01-02 15:04:05", endStr, loc)
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if err != nil {
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log.Fatalf("解析 end 失败: %v", err)
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}
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if !endT.After(startT) {
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log.Fatalln("结束时间必须大于起始时间")
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}
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// 初始化数据库
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_ = database.GetDB()
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defer database.Close()
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// 获取站点列表
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stations, err := listStations(database.GetDB(), stationID)
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if err != nil {
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log.Fatalf("查询站点失败: %v", err)
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}
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if len(stations) == 0 {
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log.Fatalln("没有符合条件的站点")
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}
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if verbose {
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log.Printf("站点数量: %d", len(stations))
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for _, s := range stations {
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log.Printf("站点: id=%s alias=%s lat=%.5f lon=%.5f z/y/x=%d/%d/%d", s.ID, s.Alias, s.Lat, s.Lon, s.Z, s.Y, s.X)
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}
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}
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// 创建CSV
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f, err := os.Create(outPath)
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if err != nil {
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log.Fatalf("创建输出文件失败: %v", err)
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}
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defer f.Close()
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w := csv.NewWriter(f)
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defer w.Flush()
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header := []string{
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"station_id", "station_alias", "dt", "lat", "lon", "wind_speed_ms", "wind_dir_deg",
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"sector_ge40_cnt", "sector_ge40_sum", "sector_ge30_cnt", "sector_ge30_sum",
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"circle_ge40_cnt", "circle_ge40_sum", "circle_ge30_cnt", "circle_ge30_sum",
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"rs485_rain_total_mm",
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}
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if err := w.Write(header); err != nil {
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log.Fatalf("写入CSV表头失败: %v", err)
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}
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ctx := context.Background()
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totalRows := 0
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var totalTiles, skipNoZYX, skipNoWind, skipDecode int
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for _, s := range stations {
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if s.Z == 0 && s.Y == 0 && s.X == 0 {
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log.Printf("跳过站点 %s（无z/y/x映射）", s.ID)
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skipNoZYX++
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continue
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}
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tiles, err := listTiles(ctx, database.GetDB(), s.Z, s.Y, s.X, startT, endT)
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if err != nil {
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log.Printf("查询瓦片失败 station=%s: %v", s.ID, err)
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continue
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}
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totalTiles += len(tiles)
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if verbose {
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log.Printf("站点 %s 瓦片数量: %d", s.ID, len(tiles))
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}
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if len(tiles) == 0 {
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log.Printf("站点 %s 在范围内无瓦片", s.ID)
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}
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for _, t := range tiles {
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// 10分钟向下取整时间（bucket）
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bucket := bucket10(t.DT, loc)
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// NOTE: 按需改为用 station_id 匹配 radar_weather.alias
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windSpeed, windDir, ok, err := loadWindAt(database.GetDB(), s.ID, bucket)
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if err != nil {
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log.Printf("读取风失败 %s @%s: %v", s.ID, t.DT.Format(time.RFC3339), err)
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continue
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}
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if !ok { // 无风场：跳过该时次
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skipNoWind++
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if verbose {
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log.Printf("跳过: %s 瓦片@%s（桶=%s）在 radar_weather(alias=%s) 无记录", s.ID, t.DT.In(loc).Format("2006-01-02 15:04:05"), bucket.Format("2006-01-02 15:04:05"), s.ID)
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}
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continue
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}
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// 解码 dBZ 网格
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vals, xs, ys, err := decodeTile(t)
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if err != nil {
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log.Printf("解码瓦片失败 %s @%s: %v", s.ID, t.DT.Format(time.RFC3339), err)
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skipDecode++
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continue
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}
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// 统计
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sec40Cnt, sec40Sum, sec30Cnt, sec30Sum,
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cir40Cnt, cir40Sum, cir30Cnt, cir30Sum := computeStats(vals, xs, ys, s.Lat, s.Lon, windSpeed, windDir)
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// 最近一条累计雨量
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rainTotal, rainOK := loadNearestRain(database.GetDB(), s.ID, t.DT)
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if verbose {
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log.Printf("写出: %s dt=%s wind=%.3f m/s %.1f° 扇形(>=40:%d/%.1f >=30:%d/%.1f) 圆形(>=40:%d/%.1f >=30:%d/%.1f) rain_total=%v(%.3f)",
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s.ID,
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t.DT.In(loc).Format("2006-01-02 15:04:05"),
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windSpeed, windDir,
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sec40Cnt, sec40Sum, sec30Cnt, sec30Sum,
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cir40Cnt, cir40Sum, cir30Cnt, cir30Sum,
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rainOK, rainTotal,
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)
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}
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rec := []string{
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s.ID,
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s.Alias,
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t.DT.In(loc).Format("2006-01-02 15:04:05"),
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fmt.Sprintf("%.6f", s.Lat),
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fmt.Sprintf("%.6f", s.Lon),
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fmt.Sprintf("%.3f", windSpeed),
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fmt.Sprintf("%.2f", windDir),
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fmt.Sprintf("%d", sec40Cnt),
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fmt.Sprintf("%.1f", sec40Sum),
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fmt.Sprintf("%d", sec30Cnt),
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fmt.Sprintf("%.1f", sec30Sum),
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fmt.Sprintf("%d", cir40Cnt),
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fmt.Sprintf("%.1f", cir40Sum),
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fmt.Sprintf("%d", cir30Cnt),
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fmt.Sprintf("%.1f", cir30Sum),
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fmt.Sprintf("%.3f", rainTotal),
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}
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if err := w.Write(rec); err != nil {
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log.Printf("写入CSV失败: %v", err)
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}
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totalRows++
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}
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}
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w.Flush()
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if err := w.Error(); err != nil {
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log.Fatalf("写入CSV失败: %v", err)
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}
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if verbose {
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log.Printf("汇总: 站点数=%d 瓦片总数=%d 跳过(无z/y/x)=%d 跳过(无风)=%d 跳过(解码失败)=%d", len(stations), totalTiles, skipNoZYX, skipNoWind, skipDecode)
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}
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log.Printf("完成，输出 %d 行到 %s", totalRows, outPath)
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}
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func listStations(db *sql.DB, stationID string) ([]stationInfo, error) {
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// 与前端一致：device_type='WH65LP' 且 lat/lon 非空且非零
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if strings.TrimSpace(stationID) != "" {
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const q = `
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SELECT station_id,
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CASE WHEN COALESCE(station_alias,'')='' THEN station_id ELSE station_alias END AS alias,
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latitude, longitude,
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COALESCE(z,0), COALESCE(y,0), COALESCE(x,0)
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FROM stations
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WHERE device_type='WH65LP' AND station_id=$1
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AND latitude IS NOT NULL AND longitude IS NOT NULL
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AND latitude<>0 AND longitude<>0`
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var s stationInfo
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err := db.QueryRow(q, stationID).Scan(&s.ID, &s.Alias, &s.Lat, &s.Lon, &s.Z, &s.Y, &s.X)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) {
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return nil, nil
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}
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return nil, err
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}
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return []stationInfo{s}, nil
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}
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const qAll = `
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SELECT station_id,
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CASE WHEN COALESCE(station_alias,'')='' THEN station_id ELSE station_alias END AS alias,
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latitude, longitude,
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COALESCE(z,0), COALESCE(y,0), COALESCE(x,0)
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FROM stations
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WHERE device_type='WH65LP'
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AND latitude IS NOT NULL AND longitude IS NOT NULL
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AND latitude<>0 AND longitude<>0
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ORDER BY station_id`
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rows, err := db.Query(qAll)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var out []stationInfo
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for rows.Next() {
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var s stationInfo
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if err := rows.Scan(&s.ID, &s.Alias, &s.Lat, &s.Lon, &s.Z, &s.Y, &s.X); err == nil {
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out = append(out, s)
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}
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}
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return out, nil
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}
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func listTiles(ctx context.Context, db *sql.DB, z, y, x int, from, to time.Time) ([]tileRec, error) {
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const q = `
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SELECT dt, width, height, west, south, east, north, res_deg, data
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FROM radar_tiles
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WHERE z=$1 AND y=$2 AND x=$3 AND dt BETWEEN $4 AND $5
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ORDER BY dt ASC`
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rows, err := db.QueryContext(ctx, q, z, y, x, from, to)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var out []tileRec
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for rows.Next() {
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var r tileRec
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if err := rows.Scan(&r.DT, &r.Width, &r.Height, &r.West, &r.South, &r.East, &r.North, &r.ResDeg, &r.Data); err == nil {
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out = append(out, r)
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}
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}
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return out, nil
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}
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func bucket10(t time.Time, loc *time.Location) time.Time {
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tt := t.In(loc)
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m := (tt.Minute() / 10) * 10
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return time.Date(tt.Year(), tt.Month(), tt.Day(), tt.Hour(), m, 0, 0, loc)
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}
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// loadWindAt 以别名(alias)精确匹配 radar_weather；本导出按需传入 station_id 作为 alias 参数
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func loadWindAt(db *sql.DB, alias string, dt time.Time) (speedMS float64, dirDeg float64, ok bool, err error) {
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const q = `
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SELECT wind_speed, wind_direction
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FROM radar_weather
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WHERE alias=$1 AND dt=$2
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LIMIT 1`
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var s, d sql.NullFloat64
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err = db.QueryRow(q, alias, dt).Scan(&s, &d)
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if err == sql.ErrNoRows {
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return 0, 0, false, nil
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}
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if err != nil {
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return 0, 0, false, err
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}
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if !s.Valid || !d.Valid {
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return 0, 0, false, nil
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}
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return s.Float64, d.Float64, true, nil
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}
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func loadNearestRain(db *sql.DB, stationID string, dt time.Time) (rainTotal float64, ok bool) {
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// 取最近一条累计雨量（单位mm）。如不存在返回0,false
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const q = `
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SELECT rainfall
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FROM rs485_weather_data
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WHERE station_id=$1
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ORDER BY ABS(EXTRACT(EPOCH FROM (timestamp - $2))) ASC
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LIMIT 1`
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var r sql.NullFloat64
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if err := db.QueryRow(q, stationID, dt).Scan(&r); err != nil {
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return 0, false
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}
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if !r.Valid {
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return 0, false
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}
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return r.Float64, true
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}
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func decodeTile(t tileRec) (vals [][]*float64, xs []float64, ys []float64, err error) {
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w, h := t.Width, t.Height
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if w <= 0 || h <= 0 {
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return nil, nil, nil, fmt.Errorf("非法尺寸")
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}
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if len(t.Data) < w*h*2 {
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return nil, nil, nil, fmt.Errorf("数据长度不足")
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}
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xs = make([]float64, w)
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for c := 0; c < w; c++ {
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xs[c] = t.West + (float64(c)+0.5)*t.ResDeg
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}
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ys = make([]float64, h)
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for r := 0; r < h; r++ {
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ys[r] = t.South + (float64(r)+0.5)*t.ResDeg
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}
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vals = make([][]*float64, h)
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off := 0
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for r := 0; r < h; r++ {
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row := make([]*float64, w)
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for c := 0; c < w; c++ {
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v := int16(binary.BigEndian.Uint16(t.Data[off : off+2]))
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off += 2
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if v >= 32766 {
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row[c] = nil
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continue
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}
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dbz := float64(v) / 10.0
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if dbz < 0 {
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dbz = 0
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} else if dbz > 75 {
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dbz = 75
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}
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vv := dbz
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row[c] = &vv
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}
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vals[r] = row
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}
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return vals, xs, ys, nil
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}
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func computeStats(vals [][]*float64, xs, ys []float64, stLat, stLon, windMS, windFromDeg float64) (
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sec40Cnt int, sec40Sum float64, sec30Cnt int, sec30Sum float64,
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cir40Cnt int, cir40Sum float64, cir30Cnt int, cir30Sum float64,
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) {
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h := len(vals)
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if h == 0 {
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return
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}
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w := len(vals[0])
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// 半径（米）与半角
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halfAngle := 30.0
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rangeM := windMS * 3 * 3600
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circleR := 8000.0
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for r := 0; r < h; r++ {
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lat := ys[r]
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row := vals[r]
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for c := 0; c < w; c++ {
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if row[c] == nil {
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continue
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}
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dbz := *row[c]
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lon := xs[c]
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dist := haversine(stLat, stLon, lat, lon)
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// 8km 圆
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if dist <= circleR {
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if dbz >= 40 {
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cir40Cnt++
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cir40Sum += dbz
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}
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if dbz >= 30 {
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cir30Cnt++
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cir30Sum += dbz
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}
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}
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// 扇形（需同时满足距离与角度）
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if dist <= rangeM {
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brg := bearingDeg(stLat, stLon, lat, lon)
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if angDiff(brg, windFromDeg) <= halfAngle {
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if dbz >= 40 {
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sec40Cnt++
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sec40Sum += dbz
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}
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if dbz >= 30 {
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sec30Cnt++
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sec30Sum += dbz
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}
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}
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}
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}
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}
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return
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}
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func toRad(d float64) float64 { return d * math.Pi / 180 }
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func toDeg(r float64) float64 { return r * 180 / math.Pi }
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func haversine(lat1, lon1, lat2, lon2 float64) float64 {
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const R = 6371000.0
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dLat := toRad(lat2 - lat1)
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dLon := toRad(lon2 - lon1)
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a := math.Sin(dLat/2)*math.Sin(dLat/2) + math.Cos(toRad(lat1))*math.Cos(toRad(lat2))*math.Sin(dLon/2)*math.Sin(dLon/2)
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c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
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return R * c
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}
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func bearingDeg(lat1, lon1, lat2, lon2 float64) float64 {
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φ1 := toRad(lat1)
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φ2 := toRad(lat2)
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Δλ := toRad(lon2 - lon1)
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y := math.Sin(Δλ) * math.Cos(φ2)
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x := math.Cos(φ1)*math.Sin(φ2) - math.Sin(φ1)*math.Cos(φ2)*math.Cos(Δλ)
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brg := toDeg(math.Atan2(y, x))
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if brg < 0 {
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brg += 360
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}
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return brg
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}
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func angDiff(a, b float64) float64 {
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d := math.Mod(a-b+540, 360) - 180
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if d < 0 {
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d = -d
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}
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return math.Abs(d)
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}
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