Is the preparation of land survey reports for lands granted to princes – with areas far larger than those granted to citizens – considered a suspicion of unlawful gain (haram) or an aiding of injustice?

There is no blame upon you for the aforementioned work, and you will not incur sin due to distinguishing some individuals in what they are granted of land, unless it becomes clear to you that injustice has been truly committed therein, due to the variation in needs and capacities. However, if it becomes clear to you that injustice has been truly committed in a certain transaction, then it is not permissible for you to assist in it, for Allah the Almighty says: "And do not cooperate in sin and aggression."