This chapter considers the basic principles of high-resolution passive microwave observations of the ocean. An idea to apply high-resolution passive microwave imagery for detailed observations of ocean surface features has been formulated by the author in 1996. High-resolution airborne passive microwave imagery is an efficient tool for exploring the ocean environment and conducting testable scientific experiments; it is a great opportunity to obtain new results as well. The multiband panoramic imagery provides a multispectral radio-brightness portrait of the ocean with the highest spatial resolution. Such an imaging concept, however, requires new technology efforts and resources, including a novel view on the remote sensing problem. Thus, the main objectives of high-resolution observations. An imagery provides a unique opportunity to explore oceanic features through two-dimensional radio-brightness pictures. Digital processing of microwave imaging data is an important part of high-resolution ocean observations. The goal of the processing is to provide selection, extraction, and evaluation of the relevant information (signatures) having geophysical sense.