[−][src]Crate flatgeobuf
FlatGeobuf is a performant binary encoding for geographic data based on flatbuffers that can hold a collection of Simple Features including circular interpolations as defined by SQL-MM Part 3.
Installation
[dependencies]
flatgeobuf = "0.3"
Reading a FlatGeobuf file
use flatgeobuf::*; let mut file = BufReader::new(File::open("countries.fgb")?); let hreader = HeaderReader::read(&mut file)?; let header = hreader.header(); let mut freader = FeatureReader::select_bbox(&mut file, &header, 8.8, 47.2, 9.5, 55.3)?; while let Ok(feature) = freader.next(&mut file) { let props = feature.properties_map(&header); println!("{}", props["name"]); }
Zero-copy feature access
let _ = feature.iter_properties(&header, |i, n, v| { println!("columnidx: {} name: {} value: {:?}", i, n, v); false // don't abort });
Zero-copy geometry reader
Geometries can be accessed by implementing the GeomReader trait.
struct CoordPrinter; impl GeomReader for CoordPrinter { fn pointxy(&mut self, x: f64, y: f64, _idx: usize) { println!("({} {})", x, y); } } let mut coord_printer = CoordPrinter {}; let geometry = feature.geometry().unwrap(); geometry.parse(&mut coord_printer, header.geometry_type());
Reading FlatGeobuf via HTTP
use flatgeobuf::*; let mut client = BufferedHttpClient::new("https://pkg.sourcepole.ch/countries.fgb"); let hreader = HttpHeaderReader::read(&mut client).await.unwrap(); let header = hreader.header(); let mut freader = HttpFeatureReader::select_bbox( &mut client, &header, hreader.header_len(), 8.8, 47.2, 9.5, 55.3, ) .await?; while let Ok(feature) = freader.next(&mut client).await { let props = feature.properties_map(&header); println!("{}", props["name"]); }
Structs
| BufferedHttpClient | |
| Column | |
| ColumnArgs | |
| ColumnBuilder | |
| ColumnMeta | |
| Crs | |
| CrsArgs | |
| CrsBuilder | |
| DebugReader | |
| Dimensions | |
| Feature | |
| FeatureArgs | |
| FeatureBuilder | |
| FeatureReader | FlatGeobuf feature reader |
| Geometry | |
| GeometryArgs | |
| GeometryBuilder | |
| Header | |
| HeaderArgs | |
| HeaderBuilder | |
| HeaderReader | FlatGeobuf header reader |
| HttpFeatureReader | FlatGeobuf feature reader |
| HttpHeaderReader | |
| NodeItem | R-Tree node |
| PackedRTree | Packed Hilbert R-Tree |
| SearchResultItem | Bbox filter search result |
Enums
| ColumnOffset | |
| ColumnType | |
| ColumnValue | |
| CrsOffset | |
| FeatureOffset | |
| GeometryOffset | |
| GeometryType | |
| HeaderOffset |
Constants
| ENUM_MAX_COLUMN_TYPE | |
| ENUM_MAX_GEOMETRY_TYPE | |
| ENUM_MIN_COLUMN_TYPE | |
| ENUM_MIN_GEOMETRY_TYPE | |
| ENUM_NAMES_COLUMN_TYPE | |
| ENUM_NAMES_GEOMETRY_TYPE | |
| ENUM_VALUES_COLUMN_TYPE | |
| ENUM_VALUES_GEOMETRY_TYPE | |
| MAGIC_BYTES | |
| VERSION |
Traits
| GeomReader |