SegyImport and OpenVDS DAG
The OpenVDS DAG should allow header parameters to be passed for the conversion which can override header information in the Segy. The DAG uses SegyImport which can accept header parameters (see http://osdu.pages.community.opengroup.org/platform/domain-data-mgmt-services/seismic/open-vds/tools/SEGYImport/README.html ), however there is no mechanism to pass these header fields to the DAG.