What type of materials are typically needed to complete this type of project?
All that is needed in order to complete this type of project is editable, original copies of the artwork that will need to be modified, as well as verbal/written assurances from our clients that they own copyright privileges for the artwork in question. If a prospective client does not own copyright privileges for the artwork that they wish to modify, then we could not help them apart from developing an entirely new graphic from scratch. As we respect the copyright and ownership issues of all of our clients, so do we respect the copyright privileges of other illustrators and map/diagram design firms in the marketplace.