Sample house outlines converted from Ottawa open data

glebe-houses-4326.geojson

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{ "type": "Feature", "properties": { "Layer": "house", "SubClasses": "AcDbEntity:AcDb3dPolyline", "ExtendedEntity": null, "Linetype": null, "EntityHandle": "B622C", "Text": null }, "geometry": { "type": "LineString", "coordinates": [ [ -75.672424410223186, 45.403996850317746, 64.6 ], [ -75.672427439703455, 45.404000825352938, 64.593 ], [ -75.672454617342837, 45.404036483048905, 64.53 ], [ -75.672484824504465, 45.404076115772099, 64.45 ], [ -75.672501242977887, 45.404097741376788, 64.41 ], [ -75.672444981224018, 45.404119020365371, 64.51 ], [ -75.672423915480366, 45.404126966469029, 64.55 ], [ -75.67239533858816, 45.404089415220689, 64.55 ], [ -75.672389943768323, 45.404091445807403, 64.59 ], [ -75.672359736665371, 45.404051813059638, 64.59 ], [ -75.672341688009695, 45.404028105943674, 64.59 ], [ -75.67239794971087, 45.40400682700529, 64.6 ], [ -75.67241171046885, 45.404001638238036, 64.6 ], [ -75.672424410223186, 45.403996850317746, 64.6 ] ] } },
{ "type": "Feature", "properties": { "Layer": "house", "SubClasses": "AcDbEntity:AcDb3dPolyline", "ExtendedEntity": null, "Linetype": null, "EntityHandle": "B623C", "Text": null }, "geometry": { "type": "LineString", "coordinates": [ [ -75.67207420160878,

see notes for background: https://gist.github.com/scruss/e7f85da2e7943cb1a1d13772fbe144d3#file-ottawabfomapdata-md

OGR makes this so easy:

ogr2ogr -f GeoJSON -s_srs epsg:2951 -t_srs epsg:4326 -dialect SQLite -sql "select * from entities where LAYER='house'" glebe-houses-4326.geojson 368029.dxf