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I'm trying to create a geojson file data based on data from my local postgis database using ogr2ogr. I'm trying to clip to a specific area and when I start to run the command, everything starts fine, but I then get an ERROR 6: GeoJSON driver doesn't support creating more than one layer and I'm not quite sure how to solve it.

Do I need to select only one column in the SELECT statement?

Command:

ogr2ogr -f GeoJSON ./test-buildings.geojson PG:"host=localhost dbname=gis user=*USERNAME* port=5432" -clipdst -84.419932, 33.992761, -84.371342, 34.018029 -clipdstsql 'SELECT way, "building" as type FROM planet_osm_polygon ORDER BY ST_YMin(ST_Envelope(way)) DESC' -progress
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  • What do you get with ogrinfo -al -so when using the same SQL?
    – user30184
    Apr 8, 2016 at 18:12
  • When I run ogrinfo -al -so 'SELECT way, "building" as type FROM planet_osm_polygon ORDER BY ST_YMin(ST_Envelope(way)) DESC', I get a failure to open datasource. Is that syntax right?
    – BDD
    Apr 8, 2016 at 18:14
  • You must include also the data source part PG:...
    – user30184
    Apr 8, 2016 at 19:00
  • Whoops. Totally spaced on that. After running it again with a datasource, I got this.
    – BDD
    Apr 8, 2016 at 19:37
  • Looks Ok. Does test-buildings.geojson already exist? It shouldn't.
    – user30184
    Apr 8, 2016 at 19:49

1 Answer 1

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I'm not completely sure, but when reading the ogr2ogr documentation, the -clipdst and -clipdstsql seems to relate to destination data object and therefore might not be relevant to this operation.

Is there a reason why you chose those variables?

I would suggest using the following syntax (untested):

ogr2ogr -f GeoJSON ./test-buildings.geojson PG:"host=localhost dbname=gis 
user=*USERNAME* port=5432" -spat -84.419932 33.992761 -84.371342 34.018029 -clipsrc 
-sql 'SELECT way, "building" as type FROM planet_osm_polygon ORDER BY ST_YMin(ST_Envelope(way)) 
DESC' -progress

In this case I define the extent of the target area with the -spat variable and use the -clipsrc variable to clip the geometries to the -spat variable. I define the sql statement with the -sql variable

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  • -clipsrc requires a reference, so I don't think -spat is required? I used -clipdst because it worked.
    – BDD
    Apr 8, 2016 at 14:19

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