I am running a simple script to clip and convert all tab files in a directory via osgeo shell

for %f in (*.TAB) do ogr2ogr "%~dpnf_Clip.shp" -clipsrc "clipped\AOI.TAB" "%f" -f "ESRI Shapefile"

It mostly works but for some files I get

ERROR 1: Attempt to write non-point (LINESTRING) geometry to point shapefile. ERROR 1: Unable to write feature 602 from layer Water_Notes_DSC. ERROR 1: Terminating translation prematurely after failed

How can I get it to split these features into _point, _line and _poly automatically?

  • 1
    there's a little option in the help that isn't explained gdal.org/ogr2ogr.html [layer[layer..]] it seems that you can specify Point, Line (polyline) or Polygon layer from your TAB, which supports multiple geometry types in the same file, into a shapefile which supports only one geometry type. May 29 '18 at 6:14
  • 1
    There is only one layer in that tab so that won't work.
    – user30184
    May 29 '18 at 6:46
  • 1
    If you use orginfo your_tab_file, you may get more info, the features are grouped by geometry type and have an ordinal number (org calls it layer).
    – Zoltan
    May 29 '18 at 7:23

MapInfo tab can contain several layers but obviously in this case there is just one layer that holds several kind of geometries. Like this one that I made for testing:

ogrinfo mixed.tab mixed
INFO: Open of `mixed.tab'
      using driver `MapInfo File' successful.

Layer name: mixed
Geometry: Unknown (any)
Feature Count: 3
  FID (Integer) = 1
  POINT (260000.01 7240000.01)

  FID (Integer) = 2
  LINESTRING (159999.99 7039999.99,300000 7140000,189999.99 7210000.01)

  FID (Integer) = 3
  POLYGON ((-30000.0 7240000.01,39999.99 7159999.99,99999.99 7279999.99,-30000.0 7240000.01))

I suggest to use ogr2ogr with the -sql parameter. As documented in http://www.gdal.org/ogr_sql.html you can select features by the geometry type.

ogr2ogr -f "ESRI Shapefile" points.shp mixed.tab -sql "SELECT* FROM mixed where ogr_geometry='POINT' OR ogr_geometry='MULTIPOINT'"

ogr2ogr -f "ESRI Shapefile" lines.shp mixed.tab -sql "SELECT* FROM mixed where ogr_geometry='LINESTRING' OR ogr_geometry='MULTILINESTRING'"

ogr2ogr -f "ESRI Shapefile" polygons.shp mixed.tab -sql "SELECT* FROM mixed where ogr_geometry='POLYGON' OR ogr_geometry='MULTIPOLYGON'"
  • this, or use the -where "<filter_expression" flag or the -nlt <geometry_type> flag
    – geozelot
    May 29 '18 at 14:01
  • 1
    Layer type (-nlt) may give unexpected result. It converts polygon also to line layer as a linear ring.
    – user30184
    May 29 '18 at 14:15
  • @user30184 great suggestion but the problem is that it's being run on a whole directory of files where I don't know if the tab being processed has more than one kind of geometry. Apart from creating a python process that does an ogrinfo and if there's more than one type, it uses your code example with -sql to split an input file into outfile_line, outfile_poly, outfile_point -can you think of a way to do this within a simple one-liner?
    – GeorgeC
    May 29 '18 at 23:35
  • 1
    Brute force is to run all three commands. It is not necessarily so slow.
    – user30184
    May 30 '18 at 10:21

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