central meridian

The Calculation of the Approximately Central Meridian in the Urban Independent Coordinate System

城市独立坐标系下似中央子午线的确定

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The relation between central meridian projection plane choice and the distortion value of projection length of areas was discoursed on, and then the essentiality to make use of intrinsic coordinate system was explained.

论述了建立独立坐标系时中央子午线及投影面的选择与各地区投影长度变形值的关系，说明了尽量利用原有坐标系统的重要性。

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In this model, the compensation projection plane is the surface of average elevation of calculated objects, and the central meridian of projection is the average longitude line of calculated objects, so the calculating result is most close to the real surveying value.

用于投影的抵偿面是计算对象所在的平均高程面，用于投影的中央子午线是计算对象所在的平均经线，因此计算结果最接近实测值。

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According to the research on the GPS control nets in LASA, the conclusion is that it is an effective way to control the length deformation through choosing a proper central meridian and basic project plane according to the different location is generated.

本文通过拉萨&贡嘎、GPS控制网的研究，根据地理位置不同，选择合适的中央子午线和基准投影面，是抵御长度变形的有效手段；

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Method three is, based on self-defining coordinate system of adjustment software, to take survey field average height as projection plane of option central meridian.

方法三：基于平差软件的自定义坐标系统，采用任意中央子午线下测区平均高程面为投影面。

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This paper provides a statistical study of the disturbance of ionospheric electron content initiated by solar flares over importance one for 1978-1979. It shows the different effects of solar flares grouped by their importance, duration, season and the distance from the solar central meridian.

本文分析了1978&1979年1级以上的太阳耀斑对电离层总电子含量的影响。

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The main conclusions are as follows; 1. The flares producing the storms with strong main phase are stronger. They concentrate mainly near the central meridian of the solar disk;

本文得到的主要结论是：1.产生强主相SC磁暴的耀斑较强，主要集中在日面中心经圈附近；

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