ИСТИНА

Libraries of spectral signatures of objects on the Earth surface are a valuable source of information for interpretation of hyperspectral satellite imagery. They become especially important with the increasing availability of satellite and airborne hyperspectral imagery. In creation of spectral libraries it is important to observe a number of principles: - use high quality calibrated measuring equipment, to collect detailed and reliable data; - use of evidence-based and well-documented measurement procedures; - select the most typical objects and their typical conditions, for example, dominant plant species in the main phenological phases; - ensure usability of the spectral library on the Internet. The aim of this work is to create a pilot spectral library based on measurements of plants, minerals and rocks, conducted in expeditions in the territory of Russia. We have analyzed the structure, content and functionality of public spectral libraries. All they are essentially laboratory spectra of minerals, whereas the majority land surface is covered with vegetation. Data collection for the spectral library has been carried out by the authors since 2011, when, thanks to the MSU Development Programme, an ASD FieldSpec3 Hi-Res hyperspectroradiometer has been purchased. It measures radiance and reflectance with the resolution of 3 nm (350-1000 nm) to 10 nm (1000-2500 nm). In 2012-2013 we developed the field measurement proceduresa and collected approximately 200 calibrated spectra, and In 2014, 600 further spectra. The library it is implemented in the form of a spectroradiometric data geoportal within the MSU Geoportal. Spectra of the objects are spatially superimposed on the base maps and satellite images of the area. This study is supported by RFBR, grants 13-05-12061 офи-м, 13-05-00466А, 15-05-0265А.