<Environment Root>: Specifying SRF Parameters
Union Of Primitive Geometry
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srf_parameters.dimensionality = SRM_DIM_THREE_D
srf_parameters.parameters.three_d = { SRM_SRF_3D_GD,
{ SRM_HDATUM_WGS_1984, SRM_VDATUM_WGS_84G, SRM_ELEV_UNIT_METRE }}