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Merge pull request #49 from whosonfirst/mbr
Add `cmd/mbr` tool
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,3 @@ | ||
| *~ | ||
| bin | ||
| bin | ||
| .DS_Store |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package main | ||
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| // > go run cmd/mbr/main.go -id 102087579 -id 102086959 -id 102085387 | ||
| // -123.173825,37.053858,-121.469214,37.929824 | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
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| _ "github.com/whosonfirst/go-reader-http" | ||
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| "github.com/paulmach/orb" | ||
| "github.com/sfomuseum/go-flags/flagset" | ||
| "github.com/sfomuseum/go-flags/multi" | ||
| "github.com/whosonfirst/go-reader" | ||
| "github.com/whosonfirst/go-whosonfirst-feature/geometry" | ||
| wof_reader "github.com/whosonfirst/go-whosonfirst-reader" | ||
| ) | ||
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| func main() { | ||
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| var reader_uri string | ||
| var ids multi.MultiInt64 | ||
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| fs := flagset.NewFlagSet("flags") | ||
| fs.StringVar(&reader_uri, "reader-uri", "http://data.whosonfirst.org", "A registered whosonfirst/go-reader.Reader URI.") | ||
| fs.Var(&ids, "id", "One or more Who's On First IDs.") | ||
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| fs.Usage = func() { | ||
| fmt.Fprintf(os.Stderr, "Derive one or more intersecting minimum-bounding-rectangles (MBR) for one or more Who's On First IDs.\n") | ||
| fmt.Fprintf(os.Stderr, "Usage:\n\t %s [options]\n", os.Args[0]) | ||
| fs.PrintDefaults() | ||
| } | ||
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| flagset.Parse(fs) | ||
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| ctx := context.Background() | ||
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| r, err := reader.NewReader(ctx, reader_uri) | ||
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| if err != nil { | ||
| log.Fatalf("Failed to create reader, %v", err) | ||
| } | ||
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| bounds := make([]orb.Bound, 0) | ||
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| for idx, id := range ids { | ||
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| body, err := wof_reader.LoadBytes(ctx, r, id) | ||
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| if err != nil { | ||
| log.Fatalf("Failed to load record for %d, %v", id, err) | ||
| } | ||
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| geojson_geom, err := geometry.Geometry(body) | ||
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| if err != nil { | ||
| log.Fatalf("Failed to derive geometry for %d, %v", id, err) | ||
| } | ||
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| orb_geom := geojson_geom.Geometry() | ||
| this_b := orb_geom.Bound() | ||
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| switch idx { | ||
| case 0: | ||
| bounds = append(bounds, this_b) | ||
| default: | ||
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| has_rel := false | ||
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| for idx_b, other_b := range bounds { | ||
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| if this_b.Intersects(other_b) { | ||
| bounds[idx_b] = other_b.Union(this_b) | ||
| has_rel = true | ||
| break | ||
| } | ||
| } | ||
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| if !has_rel { | ||
| bounds = append(bounds, this_b) | ||
| } | ||
| } | ||
| } | ||
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| for _, b := range bounds { | ||
| fmt.Printf("%f,%f,%f,%f\n", b.Min.X(), b.Min.Y(), b.Max.X(), b.Max.Y()) | ||
| } | ||
| } |
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6 changes: 2 additions & 4 deletions
6
...or/github.com/whosonfirst/warning/LICENSE → ...ub.com/whosonfirst/go-reader-http/LICENSE
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