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The correct syntax is: cs2cs +proj=lcc +lat_1=41.03333333333333 +lat_2=40.66666666666666 +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 +to +init=epsg:4326 -f %%.8f<nad.txt >out.txt with 987043 206407 in the input file nad.txt to get this output: -73.98992216 40.73321572 ...


(answering own question, hoisted from comment to question) It seems that I may have reversed lat,lng. Based on transforming (180,0), it seems that this epsg:3857 coordinate system is centered at the equator and scales by meters at the equator, using a circumference of the earth of 40075016.68557849m. So I guess that's how to scale the result.


I cannot imagine that UTM is not suitable for your purposes. Are you sure you picked the correct zone for the location of your dataset? Example: http://spatialreference.org/ref/epsg/32632/ I don't know much about P.T.L. but it seems to work similarly as UTM. It is unlikely that it is included in common GIS coordinate reference system (CRS) definitions, ...

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