共查询到20条相似文献，搜索用时 203 毫秒
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本文以ＰＣ－ＡＲＣ／ＩＮＦＯ地理信息系统为例，围绕着多重数据空间叠置分析时应使多种图形保持相同的投影坐标体系这一问题展开了讨论，首先剖析了我国普遍采用的高斯投影与通用横轴墨卡托投影（ＵＴＭ）的异同步及其关系，提出了高斯投影与其它投影之间的相与转换方法，并对投影结果进行了分析和讨论。 相似文献
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试图在遥感图像的连续制图方面做一些理论上的探讨，首次提出利用空间投影方法研究卫星遥感影像的连续制图问题。该方法的宗旨是利用空间投影坐标系来表示遥感图像坐标．利用邻带坐标的相互换算法来实现相邻轨道的图像坐标的统一，从而解决遥感图像的连续制图问题。文中同时研究了空间投影的分带投影方法，讨论了分带规定和邻带坐标换算等问题。 相似文献
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对方位投影的坐标反解在正轴投影情况下是比较容易的，可以直接利用投影公式反解，而在斜轴与横轴情况下，首先需将投影的直角坐标反解为球面坐标Ａ、Ｚ，而后再将球面坐标反解为地理坐标ψ、λ。 相似文献
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在分析与讨论基于国家坐标基准，但选择适用测区投影面的地方独立坐标系概念及其坐标与WGS-84坐标换算理论知识的基础上，介绍了使用TOPCON pinnacle GPS数据处理软件实现上述换算的方法，对各种GPS机型的随机软件进行类似计算有一定借鉴作用。 相似文献
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本文通过引入等量坐标概念，讨论高斯坐标和等量坐标以及大地坐标之间的关系，推导高斯投影坐标正反算的递推算法公式。 相似文献
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本文通过引入等量坐标概念，讨论高斯坐标和等量坐标以及大地坐标之间的关系，推导高斯投影坐标正反算的递推算法公式。 相似文献
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Steven E. Greco 《地球空间信息科学学报》2013,16(4):288-293
ABSTRACTConceptually, the theory and implementation of “map projection” in geographic information system (GIS) technology is difficult to comprehend for most introductory students and novice users. Compounding this difficulty is the concept of a “map projection file” that defines map projection parameters of geo-spatial data. The problem of the “missing projection file” appears ubiquitous for all users, especially in practice where data is widely shared. Another common problem is inadvertent misapplication of the “Define Projection” tool that can result in a GIS dataset with an incorrectly defined map projection file. GIS education should provide more guidance in differentiating the concepts of map projection versus projection files by increasing understanding and minimizing common errors. A novel pedagogical device is introduced in this paper: the seven possible states of GIS data with respect to map projection and definition. The seven possible states are: (1) a projected coordinate system (PCS) that is correctly defined, (2) a PCS that is incorrectly defined, (3) a PCS that is undefined, (4) a geographic coordinate system (GCS) that is correctly defined, (5) a GCS that is incorrectly defined, (6) a GCS that is undefined, and (7) a non-GCS. Recently created automated troubleshooting tools to determine a missing map projection file are discussed. 相似文献
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将静态的纸张和影像地图及传统的各类地理信息转化为数字时代的电子信息,其中的关键环节是怎样将栅格数据矢量化。通过在国产软件SuperMap环境下进行栅格数据矢量化过程,详细描述了栅格数据、矢量数据、坐标系、投影坐标系、地图配准和镶嵌等专业基础知识在实际中的应用。 相似文献
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陈姝 《测绘与空间地理信息》2012,35(4):165-167,170
主要介绍了大地测量参考框架;不同基本坐标系间的相互转换;地图投影的铺垫知识;不同类型的投影:方位投影、圆锥投影、圆柱投影的正反算公式.详细介绍了高斯投影正反算,换带问题;兰伯托投影正反算;墨卡托投影正反算;以及北京54,西安80,WGS-84坐标的相互转换方法.且用C++语言实现了大地坐标与空间直角坐标的转换,并用数据验证了它们.在论文中阐述了编程的基本思路. 相似文献
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一项工程的开始首先要选择正确的坐标系统,坐标系统选择得是否合适对整个工程质量至关重要,因此,我们要把坐标系统的选择作为首要重点工作对待。对于项目工程而言,建立独立坐标系统的目的是使投影长度变形控制在允许的误差范围之内。高斯-克吕格投影所建立的平面坐标系,或简称高斯平面直角坐标系,是大地测量、城市测量、普通测量、各种工程测量和地图制图中广泛采用的一种平面直角坐标系。本文根据正形投影的长度综合形变公式,推导出最佳方法。理论和实践均表明,该方法简洁、有效,能较好地抑制投影过程中的边长形变。本文就工程实践,介绍一种选取方法,研究建立城市抵偿坐标系解决变形问题。 相似文献
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Development of a Coordinate Transformation method for direct georeferencing in map projection frames
This paper develops a novel Coordinate Transformation method (CT-method), with which the orientation angles (roll, pitch, heading) of the local tangent frame of the GPS/INS system are transformed into those (omega, phi, kappa) of the map projection frame for direct georeferencing (DG). Especially, the orientation angles in the map projection frame were derived from a sequence of coordinate transformations. The effectiveness of orientation angles transformation was verified through comparing with DG results obtained from conventional methods (Legat method1 and POSPac method2) using empirical data. Moreover, the CT-method was also validated with simulated data. One advantage of the proposed method is that the orientation angles can be acquired simultaneously while calculating position elements of exterior orientation (EO) parameters and auxiliary points coordinates by coordinate transformation.These three methods were demonstrated and compared using empirical data. Empirical results show that the CT-method is both as sound and effective as Legat method. Compared with POSPac method, the CT-method is more suitable for calculating EO parameters for DG in map projection frames. DG accuracy of the CT-method and Legat method are at the same level. DG results of all these three methods have systematic errors in height due to inconsistent length projection distortion in the vertical and horizontal components, and these errors can be significantly reduced using the EO height correction technique in Legat’s approach. Similar to the results obtained with empirical data, the effectiveness of the CT-method was also proved with simulated data. 相似文献
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10参数正形变换法在江门市坐标转换中的应用 总被引：3，自引：1，他引：3
从现有江门独立坐标系及坐标转换公式着手,分析了江门独立坐标系与54北京坐标系的相互转换,提出了10参数正形变换方法,并进行了转换计算结果验证及精度分析. 相似文献
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