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TiO 2 photocatalyst beads were synthesised using the circulating fluidised bed-chemical vapour deposition (CFB-CVD) method. Their photocatalytic activity was compared with the TiO 2 photocatalyst balls synthesised using the conventional CVD (C-CVD) method. The TiO 2 film synthesized by CFB-CVD showed (110) oriented anatase crystal structure. Compared to the film synthesised by C-CVD, the CFB-CVD synthesised film had much less dense crystal structure owing to TiO 2 powders precipitated during the film growth. When the CFB-CVD synthesised TiO 2 beads were used in the photocatalytic decomposition of RhB in a fluidised bed reactor, the decomposition rate increased with increasing UV intensity and circulating flowrate and with decreasing initial RhB concentration. One important shortcoming of the TiO 2 photocatalyst beads synthesised by CFB-CVD turned out to be that the photocatalytic activity was decreased significantly by repeated reuse, calling for further investigation to improve the durability.

Abstract. Vendor-provided rational polynomial coefficients (RPCs) are commonly used to generate digital elevation models (DEMs) from high-resolution satellite images. This results in a level of accuracy that can be improved using ground control points (GCPs). It is well known that due to the inherent bias of sensor orientation the generated DEM is distorted. In the traditional way of working, the bias is corrected by integrating GCPs into the standard processing chain. This involves additional effort, since the provision of GCPs and the measurement of their image coordinates are required.In this paper, we examine whether and how the data recorded by NASA's ICESat (Ice, Cloud, and Land Elevation Satellite) mission can be used as GCPs without measuring image coordinates. The starting point are DEMs that are generated by image matching from KOMPSAT-3 satellite images with given RPCs. We developed a point-to-surface matching method that matches the ICESat points to the DEM in order to correct the DEM and improve its precision. For the experimental investigations a KOMPSAT 3 image pair is used that covers an area of 20 by 16 km2 in the Yangsan city regions. The generated DEM has a height accuracy of about 9 m. The point-to-surface algorithm with 505 ICESat points led to an improvement of the DEM height accuracy to about 2 m.