osmpbf

Package osmpbf is used to decode OpenStreetMap pbf files.

Installation

$ go get github.com/qedus/osmpbf

Usage

Usage is similar to json.Decoder.

    f, err := os.Open("greater-london-140324.osm.pbf")
    if err != nil {
        log.Fatal(err)
    }
    defer f.Close()

    d := osmpbf.NewDecoder(f)

    // use more memory from the start, it is faster
    d.SetBufferSize(osmpbf.MaxBlobSize)

    // start decoding with several goroutines, it is faster
    err = d.Start(runtime.GOMAXPROCS(-1))
    if err != nil {
        log.Fatal(err)
    }

    var nc, wc, rc uint64
    for {
        if v, err := d.Decode(); err == io.EOF {
            break
        } else if err != nil {
            log.Fatal(err)
        } else {
            switch v := v.(type) {
            case *osmpbf.Node:
                // Process Node v.
                nc++
            case *osmpbf.Way:
                // Process Way v.
                wc++
            case *osmpbf.Relation:
                // Process Relation v.
                rc++
            default:
                log.Fatalf("unknown type %T\n", v)
            }
        }
    }

    fmt.Printf("Nodes: %d, Ways: %d, Relations: %d\n", nc, wc, rc)

Documentation

https://pkg.go.dev/github.com/qedus/osmpbf

To Do

The parseNodes code has not been tested as I can only find PBF files with DenseNode format.

An Encoder still needs to be created to reverse the process.