No abstract

The paper uses D level,E level and the level of GPS control network establishment satellite space geodetic network in Laicheng industrial zone in Laiwu, through the baseline calculating, three-dimensional unconstrained adjustment and two-dimensional constraint adjustment to get the WGS-84 three dimensional coordinates and 1980 xi 'an horizontal coordinatesthe of control points; then using the fourth-order levelling connection survey all D-level, E-level control points and part GPS control points to build vertical control network, for the GPS control points of the remaining we utilize quadric function method using GPS elevation fitting given its elevation seek to obtain three-dimensional coordinates of all the basic control points.

Qingzhou-Linshu super highway, spanning 228.333km, is located in the center of Shandong province, which forms a south-to-north expressway channel. Undoubtedly, it’s an important part of Shandong highway network. Approximately, it runs from south to north and one projection zone is enough to satisfy relevant requests of horizontal coordinate system; From Qingzhou to Mazhan Town, Yishui County, most are hilly and mountainous terrain while from Mazhan Town, Yishui County to Linshu County, most are plain terrain, except for a few rolling terrain. As a result, fourth-order leveling control network is enough to meet the requirements of reconnaissance survey, design and constructive lofting. As the expressway and Ji-Qing south line carry out reconnaissance and design simultaneously and form an interchange at Mazhan Town, Yishui County, plus tight time and intense work, the systemic conformance of horizontal coordinate system and vertical datum are in high demand. The report analyses and discusses the adoption of horizontal and vertical network’s starting points, layout, observation, data processing and adjustment, together with eliminating the coordinate division and elevation value’s step of the same control point. In the meantime, it analyses how to make rapid aerial photogrammetry for the whole line with the scale of 1/2000, so as to improve the precision and reliability of horizontal and vertical datum as well as speed up the process of charting and utmostly satisfy the demand of highway reconnaissance and design.

Taking use of VirtuoZos digital photogrametric workstations of Supresoft Inc., employing full digital aerophotogrammetric mapping method, according to existing aerial photographic image database, at the foundation of basic control survey, we carry out aerial photographic control survey, surveying and mapping with pile point method, digital aerotriangulation and full digital stereocompilation. When taking 1:1000 topographic map obtained by indoor edition to field work for compration, supplement and regulation, we mainly aim at the following purposes: determining the nature and quantity as well as filling vacancy for ground and land features obtained by indoor stereocompilation; positioning for habitation, wall and railing, incompletely surveyed, drop shadow-covered and trees-obstructed ground features, as well as newly-added planimetric features after aerial photogrammetry; especially measuring the solid width of a house to centimeter and making eaves correction after measuring the length of a house when needed; correcting the geomatric positioning relationand of ground features according to their solid shape and fairly drawing them in the map; afterwards, we carry out graphic edition again during indoor work. Only in this way can we guarantee the horizontal and vertical accuracy of large scale photogrammetric mapping.

The paper uses D level, E level and the level of GPS control network establishment satellite space geodetic network in Zoucheng city, through the baseline calculating, classic adjustment of free network, three-dimensional unconstrained adjustment and two-dimensional constraint adjustment to get the WGS-84 three dimensional coordinates and 1980 xi 'an horizontal coordinates of control points; then using the fourth-order levelling connection survey all D-level and part E-level control points to build vertical control network, for the remaining GPS control points we utilize quadric function method using GPS elevation fitting given its elevation seek to obtain three-dimensional coordinates of all the basic control points.