This introduction to Remote Sensing has already become a classic textbook. It introduces the basic concepts of image interpretation based primarily based on aerial photographs. It also contains a comprehensive discussion of a wide range of detectors which is both good as background knowledge and later as refernce. The only downside is that information on satellite missions quickly get outdated as old system die and new ones are launched. It's section on digital image processing and microwave systems are quite applications oriented but also give a quite good view on the theoretical background. The thing I missed the most was a better explanation of the physical principles behind remote sensing which is not very extensively covered in this book. But it is the best introduction to remote sensing I have seen, Recommended!