青云翻译

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As the mining and other large projects of large scale topographic surveying and mapping on the rise, usually used in the actual work of engineering control network is national unity coordinates. National control network projection is too wide, leading to the true length of the edge of the control ne

And so on the big-scale work big scale terrain mapping increases gradually along with the mine, when practical work the project control net uses is usually the national unified coordinates.Because the national control net throws the shadow band width, causes the control net each side true length cha

正在翻译，请等待...

As the mining and other large projects of large scale topographic surveying and mapping on the rise, usually used in the actual work of engineering control network is national unity coordinates. National control network projection is too wide, leading to the true length of the edge of the control ne