MapReduce applications must have the characteristic of "Map" and "Reduce," meaning that the task or job can be divided into smaller pieces to be processed in parallel.
MapReduce应用程序必须具备“映射”和“缩减”的性质，也就是说任务或作业可以分割为小片段以进行并行处理。
This thesis deals with the necessity of establishing the standards of the digital map of GIS, discussing the characteristic and brings about a data structure of the GIS-oriented digital map.
论述了制订面向GIS数字地图标准的必要性和紧迫性，探讨了面向GIS数字地图的特点，最后提出了一种面向GIS数字地图的数据结构。
Because every map element solely correlates a second characteristic value, the map element can be expressed as a generalized isoline or isoplane of second characteristic value.
由于每一种地图要素唯一关联着一个第二特征值，因而地图要素可以表示为第二特征值的泛等值线或泛等值面。
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