Laser intensity images, created by visualising the amplitude of each returned laser pulse as a greyscale image, are often ignored when working with the results of lidar surveys. Fortunately a growing body of research demonstrates the value and uses of intensity imagery. In this paper (focusing on data collected by Optech instruments) we summarise the problems inherent in collecting and using intensity data, review examples of its use in a variety of environmental disciplines and discuss experiments to determine its potential uses for archaeological studies.

1. Extracting Information from Lidar Intensity Images Keith Challis IBM Vista, Institute of Archaeology and Antiquity, University of Birmingham U B

3. The Intensity Record

5. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham

7. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham Processing variables effect intensity values: Boyd and Hill 2007

10. Intensity Potential

11. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham General spectral reflectance of common materials Visible Lidar

12. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham Moisture % Organic %

20. Analysis and Interpretation A Geoarchaeological case Study

26. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham

28. Intensity: A Way Forward in Archaeology

30. Extracting Information from Lidar Intensity Images Lidar Intensity Keith Challis, IBM Vista, University of Birmingham Toolkit approaches to archaeological remote sensing