You would probably need to categorize them by type: natural area, aquatic area, and so on. Even if it is an ecosystem issue, you must nevertheless take into account the various types of natural areas and species. As regards indicators, earlier, I gave an example of the percentage of restored areas or the number of protected areas.
In Quebec, the people at Conservation de la nature developed a way of establishing priorities for areas to protect, based on the species at risk that are present. They call them hot spots. To do that, the organization used data from the federal government, the provincial government, and some NGOs. Based on that, it is possible to identify networks for connectivity, for example between protected areas and farmers. They have residual forests, corridors and riparian zones. That would make it possible to create a network everywhere, as well as connectivity among the species. It could be part of the plan.