Software architecture was developed to automate site specific field data acquisition, processing, and geo-referenced crop plant parameters extraction. The architecture supported acquisition and processing of different data streams such as digital video for machine vision and digital serial communications of NMEA strings. The number of channels for data import could be easily expanded for multiple video, GPS, and other signal sources. The architecture was objectoriented and each component in the architecture was developed as a separate class. A key component of this architecture was a supervisor class, which communicated and coordinated the operations on all other classes. Based on this framework, early stage corn population estimation (ESCOPE) software was developed which grabs pre-recorded digital video from a vehicle-mounted camera, that was passed over corn rows, and acquires GPS strings which were modulated and recorded on the audio channel. A digital video (DV) capture class was written to acquire video using Microsoft’s DirectShow® technology which enables camera control and video acquisition using higher level hardware functions. After completion of software development, reusability and extensibility characteristics were demonstrated by adding a class to acquire images from the hard drive and also by deriving a new image analyzer class to extract an additional feature. The architecture forms a general framework for developing reusable and extensible software for field data sensing systems.