Field validation of the GLASS land surface broadband emissivity database using pseudo-invariant sand dune sites in northern China

Figures & data

Figure 1. Locations of the separate field campaign sampling points in northern China (top) and field observation images in the field sites using thermal infrared spectrometers (bottom).

Table 1. Lists of field sample sites, time spans, observation conditions, instruments used, and GLASS product times.

Sample site location	Measured time span	Observation conditions	GLASS product time span	Instruments used
Dunhuang Gobi (40°05′–40°25′N, 94°20′–94°40′E)	18 August 2006, 31 July 2007	Clear, gentle breeze, observation zenith angle:0°, measurement height from the ground: about 1 m	The third eight-day of August, 2006 and July 2007	CE312 field measurement radiometers
Western desert region of Inner Mongolia (98°23′–111°20′E, 37°17′–42°9′N)	6–24 April 2010		The first eight-day, the second eight-day, and the third eight-day of April 2010	Portable Fourier transform thermal infrared spectrometer (102F, D&P Instruments, USA)
Taklimakan desert (72°14′–90°37′E, 36°23′–42°6′N)	20–24 June 2011		The third eight-day of June 2011

Figure 2. Measured emissivity at different sites in the central Taklimakan Desert.

Figure 3. Emissivity at different sand sites in western Inner Mongolia.

Figure 4. Measured emissivity of different land surface types.

Figure 5. Comparison of measured emissivity with ASTER JHU for different land surface types.

Figure 6. Sample sites of the GLASS LSBE product in northern China.

Figure 7. Comparison of measured emissivity with GLASS LSBE for different land surface types.