A procedure and system have been developed to interactively correct the geometry of image data, and merge the data with auxiliary graphical data. This system provides the following capabilities: 1. Correct the absolute and relative geometry of images. 2. Register two or more images to each other. 3. Register and overlay graphics data onto image data. 4. Change the geometry of the image and graphics data into any of twenty standard cartographic projections. 5. Provide an assessment of the accuracy of the geometric operation. The system provides for both manual selection of ground control points to establish the geometric correction parameters, and an automatic determination of mapping parameters from operator definition of the desired cartographic projection. Experiments have been conducted using a number of data sources, including Landsat Thematic Mapper data, geophysical gravity data, and digital line graph cartographic data.