Spectral libraries play significant role in remote sensing. The number of potential spectral library producers and users is increasing. The growing challenges for spectral data exchange initiated the project “SpecTour” (formerly White Reference Tour) started in 2009. This initiative was intended to network spectrometer users in order to give an overview about their measurement routines, equipment, general attitudes and first of all about the spectra. It was of high relevance during the round-robin test to use the same reference panels that were sent to the participants by post.
The project required active attendance from its participants and was performed in a round-robin approach. The philosophy was “just measure like you always do!”.
More than 35 spectrometers from Europe, Israel and USA with different spectral resolution, working and scientific history have been involved.
The project is hosted and promoted by the German Society for Photogrammetry, Remote Sensing and Geoinformation (DGPF) on a voluntary basis in close cooperation with the Martin-Luther University Halle-Wittenberg (MLU), Germany.

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