FlatGeobuf 和 Geobuf

参考：

https://gdal.org/drivers/vector/flatgeobuf.html

https://github.com/bjornharrtell/flatgeobuf

https://github.com/mapbox/geobuf

https://www.cnblogs.com/jyughynj/p/11567569.html

Examples

• Simple translation of a single shapefile into a FlatGeobuf file. The file ‘filename.fgb’ will be created with the features from abc.shp and attributes from abc.dbf. The file filename.fgb must not already exist, as it will be created.

  % ogr2ogr -f FlatGeobuf filename.fgb abc.shp

• Conversion of a Geopackage file with multiple layers:

  % ogr2ogr -f FlatGeobuf my_fgb_dataset input.gpkg

See Also

• geojsonp — the prototype that led to this project
• pygeobuf — Python implementation of Geobuf
• twkb — a geospatial binary encoding that doesn't support topology and doesn't encode any non-geographic properties besides id
• vector-tile-spec
• topojson — an extension of GeoJSON that supports topology
• WKT and WKB — popular in databases
• EWKB — a popular superset of WKB

修改源码：

! function (t, e) {
  if ("object" == typeof exports && "undefined" != typeof module) {
    e(exports, require("ol/Feature"), require("ol/geom/Point"), require("ol/geom/MultiPoint"), require("ol/geom/LineString"), require("ol/geom/MultiLineString"), require("ol/geom/Polygon"), require("ol/geom/MultiPolygon"));
  } else {
    //if ("function" == typeof define && define.amd) {
    //  define(["exports", "ol/Feature", "ol/geom/Point", "ol/geom/MultiPoint", "ol/geom/LineString", "ol/geom/MultiLineString", "ol/geom/Polygon", "ol/geom/MultiPolygon"], e);
    //} else {
      e((t = t || self).flatgeobuf = {}, t.ol.Feature, t.ol.geom.Point, t.ol.geom.MultiPoint, t.ol.geom.LineString, t.ol.geom.MultiLineString, t.ol.geom.Polygon, t.ol.geom.MultiPolygon);
    //}
  }
}

应用：

import  'flatgeobuf';
//import  flatgeobuf from 'flatgeobuf';

//

const response = await fetch('widgets/common/zonenavi/data/UScounties.fgb');

for await (let feature of flatgeobuf.deserialize(response.body)) {

  feature.getGeometry().transform('EPSG:4326', 'EPSG:3857');

  this.addFeature(feature);

}