For an Isometric camera: Create an empty GameObject called 'CameraTarget' at (0,0,0). Create a camera at (0,0,-10). Parent the Camera to the CameraTarget. Set the rotation of the Camera Target to (30,45,0) then check 'Orthographic' under the Camera settings. Adjust the 'Orthographic Size' camera setting to change the amount of zoom. Move the CameraTarget around the world to change the focal point on the map.
For the other type of camera: Do a similar setup as above except set the Camera Targets rotation to something like (60,0,0). Turn off Orthographic (there is a slight bit of perspective by the looks of it) and change the Camera's field of view to a low number like 30. You'll need to move the camera further away, so it's position will need to be more like (0,0,-30). Low settings on a field of view reduce the perspective and simulate a long zoom camera lens (hence needing to move the camera further away).
Some useful info about pictorial drawing views: Axonometric Projection