Go library for reading and writing ESRI Shapefiles. This is a pure Golang implementation based on the ESRI Shapefile technical description.
go get github.com/jonas-p/go-shp
import "github.com/jonas-p/go-shp"
// open a shapefile (SHP) for reading
shp, err := os.Open(prefix + ".shp")
if err != nil {
log.Fatal(err)
}
defer func() { _ = shp.Close() }()
// open a shapefile (DBF) for reading (needed to read attributes)
dbf, err := os.Open(prefix + ".dbf")
if err != nil {
log.Fatal(err)
}
defer func() { _ = dbf.Close() }()
// Create the Reader
shape, err := New(shp, WithSeekableDBF(dbf))
if err != nil {
log.Fatal(err)
}
// fields from the attribute table (DBF)
fields := shape.Fields()
// loop through all features in the shapefile
for shape.Next() {
n, p := shape.Shape()
// print feature
fmt.Println(reflect.TypeOf(p).Elem(), p.BBox())
// print attributes
for k, f := range fields {
val := shape.ReadAttribute(n, k)
fmt.Printf("\t%v: %v\n", f, val)
}
fmt.Println()
}
// points to write
points := []shp.Point{
shp.Point{10.0, 10.0},
shp.Point{10.0, 15.0},
shp.Point{15.0, 15.0},
shp.Point{15.0, 10.0},
}
// fields to write
fields := []shp.Field{
// String attribute field with length 25
shp.StringField("NAME", 25),
}
// create and open a shapefile for writing points
shape, err := shp.Create("points.shp", shp.POINT)
if err != nil { log.Fatal(err) }
defer shape.Close()
// setup fields for attributes
shape.SetFields(fields)
// write points and attributes
for n, point := range points {
shape.Write(&point)
// write attribute for object n for field 0 (NAME)
shape.WriteAttribute(n, 0, "Point " + strconv.Itoa(n + 1))
}