Basic-12: Sensor technologies & data acquisition techniques: ASD Field
Channel: HYPERedu
Date: 24/11/2021

Usually, when airborne data is collected, there will also be measurements taken in the field with a device called spectroradiometer that collects spectral point data. These data can be used as reference for atmospheric correction of the airborne data, however, they are also often acquired independently of airborne imaging campaigns, e.g. to study environmental processes in high temporal resolution and/or to produce spectral libraries. In this video, colleagues from the Ludwig Maximilians Universität München (Munich) will take you outdoors and show you how they perform regular measurements of agricultural areas. The instrument they are using is an ASD Fieldspec 3 spectroradiometer.

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**** For FURTHER READING we recommend ****

► Spectrometers

• Goetz A. F. H. (1975): Portable field reflectance spectrometer. JPL Technical Report (pp. 183 − 188). Pasadena, California Jet Propulsion Laboratory, California Institute of Technology.
• We have used an ASD FieldSpec HighRes ®: https://www.malvernpanalytical.com/en/products/product-range/asd-range/fieldspec-range/fieldspec-4-standard-res-spectroradiometer

► Field spectroscopy

The colleagues from LMU Munich as well as others have published great guides on spectral sampling in the field: 

• Danner M., Locherer M., Hank T., Richter K. (2015): Spectral Sampling with the ASD FieldSpec 4 – Theory, Measurement, Problems, Interpretation. EnMAP Field Guides Technical Report, GFZ Data Services. http://doi.org/10.2312/enmap.2015.008 
• Malthus T.J., Ong C., Lau I., Fearns P., Byrne G., Thankappan M., Chisholm L., Suarez B., Clarke K., Scarth P., Phinn S. (2018): A community approach to the standardised validation of surface reflectance data. A technical handbook to support the collection of field reflectance data. Release version 1.0. CSIRO, Australia. ISBN: 978-1-4863-0991-7

► Some considerations on field spectroscopy

• Hueni A., Damm A., Kneubuler M., Schlapfer D., Schaepman M. E. (2017): Field and Airborne Spectroscopy Cross Validation – Some Considerations. IEEE Journal of Seleted topics in Applied Earth Observation and Remote Sensing. Vol. 10 No. 3. http://doi.org/10.1109/JSTARS.2016.2593984 
• Milton E. (1987): Principles of field spectroscopy.  International Journal of Remote Sensing. 8:12, 1807-1827. http://dx.doi.org/10.1080/01431168708954818 
• Milton E., Fox N., Schaepman M. (2006): Progress in Field Spectroscopy. Computer Science, Economics. https://doi.org/10.1109/IGARSS.2006.509