Converts stop-and-frisk data from New York State Plane to lat/lng. Make a vrt for every csv and run `ogr2ogr` on them - be sure to make backups, it deletes the original csv for god knows what reason.

2012.vrt

<OGRVRTDataSource> 
  <OGRVRTLayer name="2012"> 
    <SrcDataSource>2012.csv</SrcDataSource> 
    <GeometryType>wkbPoint</GeometryType> 
    <LayerSRS>+proj=lcc +lat_1=40.66666666666666 +lat_2=41.03333333333333 +lat_0=40.16666666666666 +lon_0=-74 +x_0=300000 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=us-ft +no_defs</LayerSRS> 
    <GeometryField encoding="PointFromColumns" x="xcoord" y="ycoord"/> 
  </OGRVRTLayer> 
</OGRVRTDataSource>

gistfile1.txt

ogr2ogr -f CSV -t_srs EPSG:4326 -lco GEOMETRY=AS_YX -overwrite output-2013-1.csv 2012.vrt