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Prototype of a value-range query technique on earth sciences data

机译:地球科学数据的值范围查询技术的原型

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A basic value-range query on remotely-sensed earth science data is constructed in order to find areas over which the geophysical parameter values fall into a given range. An advanced version can have an area size constraint on the results, which will select only those large enough congregated regions as final results. A ternary technique with a two-level data pyramid model has been proposed by our team at GMU in order to speed up answering such queries with an approximate accuracy limit and an area size constraint. A prototype system has been built to illustrate the idea of this technique using NASA's CIDC NDVI data set. On the server side, Java programs and the Splus software are combined together to support index building, searching and convex hull generation. On the client side, SVG (Scalable Vector Graphics) is merged to Java to produce a clear and user-friendly interface. After a user submits a value-range query from the client side, the server searches the data pyramid first and then the actual data. Important stepwise results, such as the derived lower resolution area, the actual data points, and the generated convex hulls, are sent to and displayed at the client side.
机译:构造了对遥感地球科学数据的基本值范围查询,以便找到地球物理参数值落入给定范围的区域。高级版本可以对结果具有区域大小约束,这将仅选择足够大的聚集区域作为最终结果。我们的团队在GMU中提出了一种具有两级数据金字塔模型的三元技术,目的是以近似的精度限制和区域大小约束来加快回答此类查询的速度。已经建立了一个原型系统,以使用NASA的CIDC NDVI数据集说明该技术的思想。在服务器端,Java程序和Splus软件结合在一起以支持索引构建,搜索和凸包生成。在客户端,SVG(可伸缩矢量图形)被合并到Java中,以产生清晰且用户友好的界面。用户从客户端提交值范围查询后,服务器首先搜索数据金字塔,然后搜索实际数据。重要的逐步结果(例如派生的较低分辨率区域,实际数据点和生成的凸包)将发送到客户端并显示在客户端。

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