These days, inexpensive and high efficiency UAV of disaster prevention and spatial information has been given more attention. But studies about test of accuracy of UAV were not enough despite high interest. This research produced DSM and ortho photo and estimated accuracy by comparing coordinates with GNSS survey to evaluate outcome of fixed wing UAV. The ortho photo was found to make use of it to update 1/1,000 map. This research investigated spatial information construction using existing terrestrial LiDAR to suggest effectiveness of fixed wing UAV.
The chemical durability of a typical low k LTCC material consisting of zinc calcium aluminoborosilicate glass and alumina filler was studied. Leaching experiments were performed by measuring weight loss of the samples in selected acid and base aqueous solutions of HCl, H2SO4 and KOH at two different temperatures of 25° and 80°C. The leaching performance was found to depend strongly on the type of leaching solution, duration and temperature. The LTCC sample was most stable in 10 vol% KOH with a minimal weight loss of ~0.43% even after 300 min at 80°C. At the same condition, both cases of 10 vol% HCl and 10 vol% H2SO4 exhibited serious weight losses greater than 30%. It was interesting to observe that the high capability of leaching in the acid solutions originated significantly from the leaching of crystalline anorthite (CaAl2Si2O8) phase.
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