The need for accurate inventory calculation and general resource/land management in the forestry industry requires continuous map updating. Typically, foresters have turned to aerial photography combined with other land-based methods to develop and improve their land information. Often this involves the cooperation of numerous organizations for image acquisition, scanning, ground control, aerial triangulation, DEM generation and orthorectification. The resulting orthos are then mosaicked, and new features are collected and measured. The newly acquired information is now ready for additional analysis and 3D visualization. ERDAS has designed a specific, easy-to-use set of tools to streamline this time-consuming and expensive process, enabling new information to be gathered and added to databases. This seminar will guide you through introductory photogrammetric theory followed by software demonstrations that illustrate real-world examples of how resource managers are making use of various data types to update and edit their GIS. Key components will include triangulation and orthorectification of metric imagery, ortho-mosaicking, 3D measurement and feature collection, and real-time 3D scene generation and visualization.