Today, programmers can access a whole continuum of open source GIS applications, largely developed on UNIX and Linux systems.

目前，编程人员能够访问整个开源 GIS 应用程序在很大程度上依赖于 UNIX 和 Linux 系统。

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The realm of geographical data sets and GIS applications may seem a bit difficult to understand in a world that talks about open source and global environmental phenomena.

在谈到有关开源和全球环境现象时，很难让人联想到地理数据集和GIS应用程序领域。

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Several open source tools are handy for working with GIS data.

有几个开源工具可用于GIS数据。

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