CAJ | 학술논문

在对荆江航道整治过程中，现有的控制网不能满足大比例尺的航道整治工程建设，需要重新布设控制网过程，但投影变形过大，设计和施工容易产生误差，不利于航道工程的建设的需要。因此有必要对航道建设中的投影变形进行改正，达到满足航道建设的及测量的规范要求。当长度变形值不大于2．5 cm/km时，应采用高斯正形投影统一3°带的平面直角坐标系统。当长度变形值大于2．5 cm/km时，采用抵偿高程投影面的方法来消除这种变形。将实地测量的真实边长归算到国家统一的椭球面上，再将椭球面上的边长投影到高斯投影面上。实例分析归算后的长度变形均小于规范要求，可以满足和保证整治工程的施工测量。抵偿高程投影面法既满足方便了资料的统一性，更方便了长江航道数字化航道建设的需要。
재대형강항도정치과정중，현유적공제망불능만족대비례척적항도정치공정건설，수요중신포설공제망과정，단투영변형과대，설계화시공용역산생오차，불리우항도공정적건설적수요。인차유필요대항도건설중적투영변형진행개정，체도만족항도건설적급측량적규범요구。당장도변형치불대우2．5 cm/km시，응채용고사정형투영통일3°대적평면직각좌표계통。당장도변형치대우2．5 cm/km시，채용저상고정투영면적방법래소제저충변형。장실지측량적진실변장귀산도국가통일적타구면상，재장타구면상적변장투영도고사투영면상。실례분석귀산후적장도변형균소우규범요구，가이만족화보증정치공정적시공측량。저상고정투영면법기만족방편료자료적통일성，경방편료장강항도수자화항도건설적수요。
In the process for the Jingjiang channel regulation ,the existing control network cannot meet the large-scale channel regulation .It need to re-layout control network ,but the projection distortion is too large ,the design and construction are easy to produce error ,which is not conducive to the construction of channel project .Therefore it is necessary to correct the projec-tion distortion in channel construction ,to meet measurements regulatory requirements .When the length of the deformation is not greater than 2 .5cm/km ,it should use Cartesian coordinate system of Gauss conformal projection uniform 3° belt .When the value is greater than 2 .5cm/km ,projection datum plane with compensation effect is using to eliminate this distortion .The real side of the field measurements is imputed to national unity ellipsoid ,and then side of ellipsoid sphere is projected onto the Gaussian projection surface .Deformation length after imputing is less than specification requirements from examples analysis , meeting and assuring the construction measurement of regulation .Projection datum plane with compensation effect meets not only the unity of data ,but also the convenient digital channel of the Yangtze River channel construction .