The Israeli military has begun its ground offensive in southern Gaza Strip, an analysis by the Associated Press of satellite photos has shown.

The satellite photos released by Planet Labs PBC provide the first clear look at the intensity and scope at which the Israelis are fighting, the report says.

The images, taken on Sunday, show Israeli tanks and armoured personnel carriers just under six kilometres north of the heart of Khan Younis, the major city of the southern part of the enclave, where many Gazans have evacuated to.

The Israeli deployment sits just to the west of Salah al-Din, a main north-south corridor within the Gaza Strip that many used to flee. An AP analysis found positions in four clusters, with a total of around 150 armoured personnel carriers, tanks and other vehicles in the area. Israeli soldiers have created packed dirt berms around some of their positions, which can be used for cover.

The manoeuvre and the number of vehicles there suggests that the Israeli military is preparing to potentially move south in Khan Younis, AP said.