针对数据更新中常见的河流偏离山谷线这一空间不一致问题, 提出了一种基于矢量投影法的快速、准确 地提取山谷点的方法, 并利用提取出的山谷点来检查与其相关河流的空间关系的一致性 最后利用VB6. 0+ MO实 现了该方法, 并进行了大量的数据测试, 取得了较好的效果。-In order to detect the spatial con flicts that rivers dev iate from the va lleys in the process o f topog raph ic

he fabrication and performaince of a semiconductor optical amplifier for wavelength conversion in subcarrier multiplexed system is described. The amplifier is of the buried facet design and has p o ~ a r ~ ~ a ~anido nre flectivity gain ripple