SURVEY ON MOVING ICE
SURVEY ON MOVING ICE
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移动冰调查
DOI：
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发表时间：
1970
期刊：
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通讯作者：
R. Thomas
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文献类型：
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作者：
R. Thomas
为了测量南极布伦特冰架上的冰变形，在冰架上放置了64个标志物，形成一个重叠的支撑四边形网络。该网络于1966年进行三角测量，间隔10个月后，于1967年再次进行三角测量。在整个观测期间，测量数据不断受到扭曲，任何计算方法都必须考虑到这一点。假设冰在每个标记处的运动是线性的，则可以内插观测站的位置，并将三角测量方案处理为一系列切除。为了解决这些问题，开发了一种面向计算机的切除解决方案，并适用于接受测量长度以及角度作为输入数据。为了校正地球曲率，并利用观测到的真实方位角，采用了一个简单的球体模型，测量得出了所有标志物在占领时的位置;相对于方案原点的位置精度为1：40，000。IC的价值观
AbstractIn order to measure ice deformation at frequent intervals across the Brunt Ice Shelf, Antarctica, 64 markers were planted to form a network of overlapping braced quadrilaterals. This network was triangulated in 1966 and, after a 10-month interval, again in 1967. Throughout the periods of observation the survey figures suffered continual distortion, and any computation method must allow for this. Making the assumption that ice movement at each marker is linear it is possible to interpolate the positions of observed stations and to process the triangulation scheme as a series of resections. To solve these a computer-oriented resection solution was developed, and adapted to accept measured lengths in addition to angles as input data. In order to correct for Earth-curvature, and to utilise observed true azimuths, a simple spheroid model was adopted.The survey yielded positions of all markers at the times of occupation; position accuracy relative to the origin of the scheme was 1 : 40,000. Values of ic...