共查询到20条相似文献,搜索用时 125 毫秒
1.
解析测图仪在城市大比例尺航测加密中的作用铁道部专业设计院陈绍光八十年代中期,随着我国国民经济发展,城市建设一直处于在重要位置。我国城市大比例尺航测也蓬勃发展,为城市规划、土地利用、市政工程提供1:2000,1:1000,1:500,比例尺地形图。以往... 相似文献
2.
地质部区测局试验小组 《测绘学报》1982,(3)
本试验报告共分四部分:第一部分介绍试验区的地理及航摄资料情况,以及航测内、外业的工作情况。第二部分介绍航测试验图的检查实施及其结果情况。第三部分推导了大比例尺航测成图的精度估算公式,并列表比较估算精度与解析法检查的结果。第四部分根据试验结果及理论精度的估算,论述了大比例尺航测成图的放大倍数问题,以及有关成图的技术要求问题。 相似文献
3.
随着现代航测技术的发展,立体测图仪正由模拟型向解析型仪器发展。与传统的模拟型仪器相比,解析型仪器具有了无可比拟的优势。计算机技术的引入使之功能更加齐全,灵活方便,精度有了较大的提高。更重要的,解析仪器可以适应未来航测数字化的要求,成为航测数字化系统的重要输入来源:我院先后引进了IX-3解析测图仪,改造成功了B8S-AAB解析测图仪。这些仪器在生产中发挥了巨大的作用,使生产效率大力提高。 相似文献
4.
5.
本文根据实验数据,对城市大比例尺航测成图中应用航带法区域网加密的实际精度作了研究,着重讨论了区域大小(航线计算段的跨度,航线数)、控制点布设、摄影比例尺,航摄机焦距、摄影质量诸因数对于加密点的精度影响,并作出了一些粗略的定量分析,得出了若干结论。在此基础上提出了城市航测成图的有利布网方案,对在大比例尺航测成图中应用解析空中三角测量提供了实践和理论依据。 相似文献
6.
7.
8.
《测绘通报》1978,(1)
以英明领袖华主席为首的党中央,继承毛主席的遗志,提出了“抓纲治国”的伟大战略决策,国民经济出现了全面大跃进的新形势。为了适应煤炭工业发展的跃进形势,满足矿区生产和建设编制各种矿图的需要,为煤矿大变快上,多出煤,出好煤做出贡献,矿区原有地形图必须迅速更新。在现有条件下,普及和推广航测方法,是一种多快好省的成图方法。因此我们于一九七七年四月至六月进行了1:2000航测成图的试验工作。试验由辽宁省煤炭工业局直接主持领导,辽宁省煤田地质勘探公司组织进行,参加现场试验工作的有:煤炭部航测大队、沈阳矿务局、阜新矿务局、本溪矿务局、抚顺矿务局、北票矿务局、阜新煤矿学院等单位的同志,此外还有阜新市城建局和抚顺市城建局的人员参加。试验工作的航测外业由辽宁省煤炭工业局航测学习班完成,航测内业成图由煤炭部航测大队完成,随即进行了野外检测工作。经过两个多月的实验,取得了满意的效果,为煤炭系统今后开展1:2000比例尺航测成图积累了经验。 相似文献
9.
电子计算技术用于航测仪器后,给用航测法测制城市大比例尺地形图提供了新的测绘手段,传统的平板仪测量方法将被航测所取代。解析测图仪是用电子计算机控制的一种具有结构简单,操作方便,测量精度高等特点的航测仪器。它能绘制多种比例尺地形图,尤其在大比例尺地形测量中,优于一般的模拟型航测仪器,以其精度高、功能全的优势被广泛应用。由国家测绘局测绘科学研究所与无锡测绘 相似文献
10.
本文论述了南昆线项效方案18‰和12‰。两大比较方案的1:2000地形图航测制图,在时间紧、任务重、测区气象条件极差的情况下,搜集贵州、广西两省、区测绘局的中、小比例尺既有航摄资料,进行1:2000比例尺航测制图的可行性和方法。总结了利用国家既有航摄资料进行1:2000测图,可取得较大的经济效益和社会效益。为发展铁路航测遥感技术,摸索了一条新路。 相似文献
11.
12.
13.
14.
地图投影反解变换的一种新方法 总被引:6,自引:1,他引:5
通常地图投影反解变换有2种方法,即多项式拟合法和投影方程解析法.多项式法利用已知控制点的坐标对应关系,通过最小二乘法拟合求解地图投影反解变换的多项式函数,其优点是反解模型与地图投影无关,算法具有通用性,缺点是反算精度较低.解析法根据地图投影正算公式,在一定条件下通过解方程求得地图投影反解变换解析式,其优点是反解变换精度高,缺点是解法复杂.本文利用计算数学方法,根据地图投影变换的基本数学原理,提出了一种新的地图投影反解变换方法,双向迭代逼近法(BDIRA).具有反解变换精度高、收敛速度快、算法通用和GIS软件编程实现方便等特点. 相似文献
15.
北京市1:50000地形图缩编更新生产工艺设计 总被引:1,自引:0,他引:1
结合北京市地理数据现状,在对现有数据和国家1:50000地形图缩编要求综合分析基础上,设计了利用1:10000DLG缩编更新北京市1:50000地形图的生产工艺.该工艺不仅有效的利用了现有的正射影像和矢量资料,而且将搜集到的民政勘界、交通专题数据有机地运用到1:50000地形图缩编更新中去,较好地满足了国家1:50000地形图缩编更新的要求.实践证明,本文设计的缩编工艺是可行的,对其他单位和部门的1:50000地形图缩编生产具有一定的参考价值. 相似文献
16.
A section of an Apollo space photo relating to the Magadh area of Bihar state was monoscopically interpreted resulting in six delineations based upon tone and texture variations. Small scale aerial photographs were used for the preparation of soil map of a part of the area using a systematic air photointerpretation procedure; this served as a basis for defining the soil composition of four out of the six space photo analytical units. In respect of the remaining two units-soil information was obtained by reference to an existing small seale soil map of Bihar State. The data thus obtained have been used to prepare a small scale soil map of the selected section of the Apollo space photo. The soil map of the part of the space photo area that is based on support ph: to-interpretation has been found to have the quality and accuracy expected of very small scale soil maps. 相似文献
17.
18.
G. Ducher 《The Photogrammetric Record》1985,11(66):671-689
A short review is given of the involvement of the Institut Géographique National (IGN) in the European Space Agency Spacelab Metric Camera (MC) experiment. IGN has participated in this project from the early stages of its preparation in 1974. The assessment of MC data has been carried out for both metric and thematic purposes. Using a Matra Traster analytical plotter, a contoured map of Carpentras. included in the European standard test site of Marseille, has been prepared at a scale of 1:100 000 with 100 m and 50 m contour intervals. Preliminary comparison of this map with the topographic data base shows a height accuracy of about 30 m. Orthophotographs have been produced of the same area, at 1:100000 scale and at 1:250000 scale. showing good agreement with the basic line map. An infrared colour pseudo-orthophotograph has been produced for Khartoum (assuming that the ground was flat) and a space map of a desert area of Algeria has been printed at 1:200000 scale, allowing a good comparison with the drainage shown on the existing line map. Interpretation of the MC photography has also been assessed and compared with conventional IGN aerial photography taken over the European standard test site. Due to the low sun elevation and the apparent image motion which affected the MC photography, the result is not as good as was expected. Some linear features of 6m width are visible (for example, roads and hedges) but for positive identification a width of 18m is necessary. It is difficult to determine the extent of cities and land parcels less than 40 × 40m are not visible. However, the MC data can be used for checking and revising some features of small scale maps (smaller than 1:100000). Two experiments have been performed in thematic interpretation, one concerned with land use and the other with forest mapping. Some improvements of the MC are suggested in order to satisfy the major requirements of users while the possibilities of topographic mapping from these data are summarised. 相似文献
19.
《制图学和地理信息科学》2013,40(3):239-250
The computational complexity of algorithms is an important consideration for all computer systems, including geographic information systems and mapping systems. Mathematical cartographers and GIS professionals need to understand and to take into account the limitations imposed on problem solving by the very nature of computation itself. We look at three active research sub-areas of analytical cartography to highlight the differences between traditional mathematical solutions and solutions with computationally tractable algorithms. The three sub-areas are map projections, map feature labeling, and map generalization. 相似文献
20.
WIN32下电子地图制图与应用系统设计 总被引:1,自引:0,他引:1
探讨了电子地图制作和分析应用的相关技术,并认为电子地图已从“只读”系统向“分析”系统发展,电子地图的应用分析功能将成为今后研究的重点。 相似文献