Exporting Imagery in EPSG: 6414

Norm WooNorm Woo Global Mapper UserPosts: 3
I have a client I'm trying to delivery imagery to in EPSG: 6414.  I'm exporting the imagery out as 4-Band GeoTiff out of GlobalMapper and the Client saying the exports are not right:

“6414 Proj.4: "+proj=aea +lat_1=34 +lat_2=40.5 +lat_0=0 +lon_0=-120 +x_0=0 +y_0=-4000000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"

Imagery Proj.4: "+proj=aea +lat_1=34 +lat_2=40.5 +lat_0=0 +lon_0=-120 +x_0=0 +y_0=-4000000 +ellps=GRS80 +towgs84=-3.2,-5.7,2.8,0,0,0,0 +units=m +no_defs"


The problem is the +towgs84=-3.2,-5.7,2.8,0,0,0,0 transformation value is applied when changing the projection from EPSG 6414 to  EPSG 3857 that we must do when creating tile map services.”

Does anyone have any ideas how i can resolve this issue?


  • Norm WooNorm Woo Global Mapper User Posts: 3
    To clarify the client is say the issue is in the header file of the GeoTiff.
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