In this paper, we present two user-centered systems aiming at making easier the modeling of architectural and urban scenes by using two different but complementary approaches. The first one MArINa, an image-based modeler, allows the user to reconstruct urban scenes from one or more graphical documents. This method focuses more on reconstructing models and is more dedicated to the production of 3D sketches. The second modeler, MArCo is a knowledge-based modeler containing the know-from and know-how on classical architecture. It allows the user to model classical architectural scenes verifying automatically all the domain rules. Finally, we show how MArINa and MArCo can cooperate providing the user a tool combining efficiently their respective capabilities.