Hi:

I am using ogr2ogr to project a shapefile defined in a sphere to NAD83. My command is like the following:

ogr2ogr -t_srs "+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs " -s_srs "+proj=lcc +a=6370000.0 +b=6370000.0 +lat_1=33 +lat_2=45 +lat_0=40 +lon_0=-97" wrf12km_nc_g152.shp wrf12km_nc.shp

Could you tell me which datum transformation method is used during projecting? In arcGIS there are many selections such as geocentric method, NADCON method and others.

Thank you,

Limei
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