Reconstruction

I need to edit a single image(something like camera tracking) here in this pic i want to edit the tow hills covering them with a different texture.how can i do that ?

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two ways that came to my mind, if you are planning on using camera projection, i would start off by projecting everything to an aproximate mesh that is similar to the environment, and then use witchever texture or other image or whatever and project it on top of the hills.
i dont know if its easy to make this seamless, but there is the easiest way.

a more complicated, yet i think better method is to recreate the image in photoshop to be how you want it to be.
simply erase the hills, and add inn new once and color correct it to match the rest of the image.