PDOK-14231

README.md

@@ -30,14 +30,17 @@ vector tiles can be omitted, and less data needs to be processed.
 - :warning: Spatialite lib is mandatory for running this application. This lib is needed for
   creating the RTree triggers on the spatial tables for updating/maintaining the
   RTree.
+- It is also possible to replace the filtered out geometry with a centroid POINT geometry instead, 
+  using the -replace option
 
 ## Usage
 
 ```go
 go build .
 
 go run . -s=[source GPKG] -t=[target GPKG] -r=[resolution for filtering] \
-   -p=[pagesize for writing to target GPKG]
+   -p=[pagesize for writing to target GPKG] -replace [t/f for replacing \
+   instead of removing (optional)]
 
 go test ./... -covermode=atomic
 ```

go.mod

@@ -9,6 +9,8 @@ require (
 	github.com/urfave/cli/v2 v2.8.1
 )
 
+require github.com/twpayne/go-geom v1.4.1
+
 require (
 	github.com/gdey/errors v0.0.0-20190426172550-8ebd5bc891fb // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect

go.sum

@@ -1,34 +1,91 @@
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main.go

@@ -13,6 +13,7 @@ const SOURCE string = `source`
 const TARGET string = `target`
 const RESOLUTION string = `resolution`
 const PAGESIZE string = `pagesize`
+const REPLACE_WITH_POINT string = `replace_with_point`
 
 func main() {
 	app := cli.NewApp()
@@ -50,6 +51,14 @@ func main() {
 			Required: false,
 			EnvVars:  []string{"SIEVE_PAGESIZE"},
 		},
+		&cli.BoolFlag{
+			Name:     REPLACE_WITH_POINT,
+			Aliases:  []string{"replace"},
+			Usage:    "Should sieved geometries be replaced with POINT geometry",
+			Value:    false,
+			Required: false,
+			EnvVars:  []string{"REPLACE_WITH_POINT"},
+		},
 	}
 
 	app.Action = func(c *cli.Context) error {
@@ -69,7 +78,7 @@ func main() {
 
 		tables := source.GetTableInfo()
 
-		err = target.CreateTables(tables)
+		err = target.CreateTables(tables, c.Bool(REPLACE_WITH_POINT))
 		if err != nil {
 			log.Fatalf("error initialization the target GeoPackage: %s", err)
 		}
@@ -81,7 +90,7 @@ func main() {
 			log.Printf("  sieving %s", table.Name)
 			source.Table = table
 			target.Table = table
-			pkg.Sieve(source, target, c.Float64(RESOLUTION))
+			pkg.Sieve(source, target, c.Float64(RESOLUTION), c.Bool(REPLACE_WITH_POINT))
 			log.Printf("  finised %s", table.Name)
 		}
 

pkg/gpkg/gpkg.go

@@ -192,14 +192,14 @@ func (target TargetGeopackage) Close() {
 	target.handle.Close()
 }
 
-func (target TargetGeopackage) CreateTables(tables []Table) error {
+func (target TargetGeopackage) CreateTables(tables []Table, replaceGeomWithPOint bool) error {
 	for _, table := range tables {
 		err := target.handle.UpdateSRS(table.srs)
 		if err != nil {
 			return err
 		}
 
-		err = buildTable(target.handle, table)
+		err = buildTable(target.handle, table, replaceGeomWithPOint)
 		if err != nil {
 			return err
 		}
@@ -373,19 +373,27 @@ func getTableColumns(h *gpkg.Handle, table string) []column {
 }
 
 // buildTable creates a given destination table with the necessary gpkg_ information
-func buildTable(h *gpkg.Handle, t Table) error {
+func buildTable(h *gpkg.Handle, t Table, replaceGeomWithPoint bool) error {
 	query := t.createSQL()
 	_, err := h.Exec(query)
 	if err != nil {
 		log.Fatalf("error building table in target GeoPackage: %s", err)
 	}
 
+	// as sieved geometry is replaced by a POINT, it is necessary to allow multiple geometry types
+	var geometryType gpkg.GeometryType
+	if replaceGeomWithPoint {
+		geometryType = gpkg.Geometry
+	} else {
+		geometryType = t.gtype
+	}
+
 	err = h.AddGeometryTable(gpkg.TableDescription{
 		Name:          t.Name,
 		ShortName:     t.Name,
 		Description:   t.Name,
 		GeometryField: t.gcolumn,
-		GeometryType:  t.gtype,
+		GeometryType:  geometryType,
 		SRS:           int32(t.srs.ID),
 		//
 		Z: gpkg.Prohibited,