Information about the environment can also be gained when measuring the external shear in the strong lens image reconstruction. This has been done in e.g. Suyu et al 2013.
Just for your information: I am going to publish an analysis of a strong lens in the cosmos field where I measured the shear to the lens (including the non-linear effects on the lens model) and the source. Taking this information into account leads to roughly double the precision in the convergence estimate.
section 4.3 environment and LOS structure
Information about the environment can also be gained when measuring the external shear in the strong lens image reconstruction. This has been done in e.g. Suyu et al 2013.
Just for your information: I am going to publish an analysis of a strong lens in the cosmos field where I measured the shear to the lens (including the non-linear effects on the lens model) and the source. Taking this information into account leads to roughly double the precision in the convergence estimate.