在IDL开发平台下，对一个栅格数组(2维矩阵)的连通性进行求掩码，将连通的同一个数的所有相邻数据全部以一个自增的掩码标识出来，并且自动识别和标出对孤岛，可以指定需要计算的有效值或者不需要计算的无效值。-In IDL under development platform for a grid array (2-dimensional matrix) for connectivity to mask, the same number will be connected all the data in all adjacent to a self-marked by the mask, and automatic identification and marked on the island, you can specify the need to calculate the RMS or do not need to calculate the invalid value.