GeoJSON Sequences (Newline-delimited)
Open BetaGeoJSON-Seq ir rindās dalīts GeoJSON variants, kurā katra rinda ir atsevišķs objekts. Ideāli piemērots straumēšanai, žurnālošanai un lielo datu plūsmām.
Galvenās iespējas
Par GeoJSON-Seq formātu
GeoJSON-Seq (RFC 8142) is the same GeoJSON laid out line by line: one line is one whole feature. There is no common FeatureCollection wrapper, which means you do not have to read the entire file to get to the first feature.
This is a pipeline format. Such files are read line by line and processed as a stream: filtered with jq, fed to tippecanoe to build vector tiles, poured into Kafka or Spark, cut into pieces by line count. Memory usage does not depend on the size of the export.
The output is a single .geojsonl with the features of all the selected layers written one after another. Each has a _layer property with the name of its source layer, OpenStreetMap attributes are preserved, and coordinates are WGS84 (EPSG:4326) with six decimal places.
The format is good at exactly what ordinary GeoJSON is bad at on large volumes, and vice versa: you cannot put a .geojsonl straight into Leaflet — the lines are first assembled into a FeatureCollection or processed as a stream.
Kura programma atver GeoJSON-Seq failus
Tālāk norādītās programmas un lietotnes var atvērt, rediģēt un strādāt ar GeoJSON Sequences (Newline-delimited) (.geojsonl) failiem, kas eksportēti no OSM2CDR:
Format specifications
- Open standard
- 3D coordinates supported
- Lossless (no quality loss)
- Stores feature attributes
- Output: 1 file
- RFC 8142 GeoJSON Text Sequences (newline-delimited). Streamable line-by-line — ideal for big-data pipelines and incremental loading.
Kas izmanto GeoJSON-Seq kartes
Kā eksportēt GeoJSON-Seq
Kā atvērt pēc eksporta
- jq — jq -c 'select(.properties._layer=="roads")' map.geojsonl > roads.geojsonl filters out the layer you need without loading the file into memory.
- Tippecanoe — tippecanoe -o map.mbtiles map.geojsonl builds vector tiles: the line-based format is its native input.
- QGIS and ogr2ogr — GDAL reads GeoJSONSeq out of the box: ogr2ogr -f GPKG out.gpkg map.geojsonl.
- Python — read the file line by line and parse json.loads(line): memory does not depend on the volume; to bring the whole layer up, use geopandas.read_file("map.geojsonl").
- Splitting it up — an ordinary split -l 100000 map.geojsonl part_ gives valid pieces: every line is self-contained.
Populāras kartes formātā GeoJSON-Seq
Eksportējiet kartes formātā GeoJSON Sequences (Newline-delimited)
Lejupielādējiet profesionālas GeoJSON-Seq kartes no OpenStreetMap. Tūlītēja ģenerēšana, jebkurš apgabals.
Biežāk uzdotie jautājumi
GeoJSON-Seq guides and tutorials
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Наконец-то карты можно скачать в векторе. Автору спасибо!
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