1. A method of estimating stress in an earth formation, comprising: receiving sensor data from at least one sensor in an earth formation; generating with a processing unit a domain including at least a portion of the earth formation based on the sensor data; dividing the domain including at least the portion of the earth formation into a first region and a second region; estimating with the processing unit a first vertical stress in the first region and representing the first vertical stress as at least one point load; and estimating with the processing unit a second vertical stress in the second region by a point load based method using the first vertical stress.