Literature
A description of the sampling methodology in the network:
Eklundh L., Jin H., Schubert P., Guzinski R. and Heliasz M., 2011, An Optical Sensor Network for Vegetation Phenology Monitoring and Satellite Data Calibration. Sensors, 11, 7678-7709. sensors-11-07678-v2.pdf
Handbooks:
Guidelines for multispectral measurements in NordSpec and SITES Spectral (version 2017-05-09).
Spectral sampling:
Balzarolo M., Anderson K., Nichol C., Rossini M., Vescovo L., Arriga N., Wohlfahrt G., Calvet J.-C., Carrara A., Cerasoli S., Cogliati S., Daumard F., Eklundh L., Elbers J.A., Evrendilek F., Handcock R.N., Kaduk J., Klumpp K., Longdoz B., Matteucci G., Meroni M., Montagnani L., Ourcival J.-M., Sanchez-Cañete E.P., Pontailler J.-Y., Juszczak R., Scholes B. and Martín M.P., 2011, Ground-Based Optical Measurements at European Flux Sites: A Review of Methods, Instruments and Current Controversies. Sensors, 11, 7954-7981. sensors-11-07954.pdf
Gamon J.A., Rahman A.F., Dungan J.L., Schildhauer M. and Huemmrich K.F., 2006, Spectral Network (SpecNet): what is it and why do we need it?, Remote Sensing of Environment, 103, 227-235.
Software
Matlab script by H. Jin for calculating the footprint of spectral sensors: http://www.mathworks.com/matlabcentral/fileexchange/35503-foot-print-of-spectral-sensor-with-conic-view