The objectid column is there to support some GIS and map viewer software, including the ArcExplorer program that is available for free download from IBM (see Resources).
这里的objectid列用来支持某些GIS和地图查看软件，包括ArcExplorer程序(可以从IBM免费下载，参见参考资料)。
On the desktop, Simplify Media's application now also includes a Photo Viewer, which replicates the iPhone app's functions on your desktop, including the map view.
Simplify Media的桌面应用程序现在也包括一个图片浏览器，它可以在你的电脑桌面重现它iPhone应用程序的功能，其中包括地图浏览模式。
The result is that objects close to the viewer get more shadow map pixels than objects far away.
结果是物体接近观看者将比更远的物体获得更多的阴影贴图像素。
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