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It is known that the fundamental photogrammetric and remote sensing problem is the determination with high accuracy of the attitude, the position and the intrinsic geometric characteristics of the sensor. The new aerial photogrammetric systems allow the real-time determination of all parameters of exterior orientation with good enough accuracy and for this reason we can achieve direct georeferencing without needing to determine the coordinates of landmarks in the field, before or after the photogrammetric flight. In our application in this paper we consider known the camera's interior orientation parameters, the camera's exterior orientation parameters (position and attitude) and the boresight misalignment angles between navigation sensor and digital camera system. So, we present some practical results of so called direct georeferencing of digital images, using of direct measurements of the image's exterior orientation parameters by a GNSS/IMU system for DTM obtaining and a fast automatic image's orthorectification. In our application we used the collinearity concept, which is the basis for all direct georeferencing formulas, without using ground control points. We used ground control points only for a good accuracy estimation of the method. As a conclusion is that most of the actual developments of digital optical cameras, or another type of sensor, have integrated the IMUs and the use of GNSS/IMU for direct georeferencing of airborne sensor data is nowadays standard. The accuracy of this rectification result, through a direct georeferencing method, is crucial for overlaying the data with any existing data sets or maps and using them for evaluations in change detection, map updating or other purposes. [ABSTRACT FROM AUTHOR]