To solve the efficiency problems associated with huge amounts of GIS data that are stored and accessed with a common relational database, the authors propose the following solution:the storage method of a non-relational database. On the basis of GIS data features: volume of data, variety of data types, and complexity of data structures, the authors analyzed the application requirements of the large GIS data storage and processing, and checked the big data support from the NoSQL document database of mongoDB. The authors propose an efficiently large data storage method for GIS spatial data in NoSQL (Not only SQL) database. Finally, by means of the installation and configuration of mongoDB server, the authors have also carried out parsing, storage, and query of the huge GIS spatial data of the shape file format by using the Python programming language under the Linux platform. The resultsshow that the NoSQL database has obvious advantages by comparison to the traditional relational databases.
To improve the photocatalytic activity of titanium oxide, nanometer titanium oxide powder was mixed with a phosphoric acid solution to form an electrolyte for preparing TiO2/Al2O3 coating on the surface of an aluminum alloy. Hydrothermal technology has been used to adjust the crystalline structure of nanometer titanium oxide. Scanning electron microscope was used to observe the micromorphology of anodic coating before and after treatment using hydrothermal technology. Results indicated that the photocatalyst had a porous structure. Energy dispersive spectrometry, x-ray diffraction, and x-ray photoelectron spectroscopy were used to confirm that titanium oxide was dispersed in the coating. The photocatalyst was used to degrade the methyl orange solution, and its absorbance before and after treatment by catalyst was tested by UV–vis spectroscopy. The results indicated that methyl orange could be degraded when the doping amount of titanium oxide is 8 g/l for 100 min.
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