Enhancing adaptive composite map projections: Wagner transformation between the Lambert azimuthal and the transverse cylindrical equal-area projections

The adaptive composite map projection technique changes the projection to minimize distortion for the geographic area shown on a map. This article improves the transition between the Lambert azimuthal projection and the transverse equal-area cylindrical projection that are used by adaptive composite projections for portrait-format maps. Originally, a transverse Albers conic projection was suggested for transforming between these two projections, resulting in graticules that are not symmetric relative to the central meridian. We propose the alternative transverse Wagner transformation between the two projections and provide equations and parameters for the transition. The suggested technique results in a graticule that is symmetric relative to the central meridian, and a map transformation that is visually continuous with changing map scale.     

多源数据融合的高速公路占地分类面积计算方法

为减少公路、铁路等用地报批过程中的土地利用分类面积统计工作量,本文采用将Auto CAD格式的用地红线数据与MAPGIS格式的地类信息数据相结合的方法,自动完成分类面积统计。重点介绍了数据坐标转换、格式转换与面积统计问题。以娄衡高速衡阳段主线为例,进行土地分类面积统计,并对所提方法分类精度的影响因素进行定性分析。     

基于CORS系统的网络RTK技术在土地勘测定界中的应用

基于CORS系统的GPS网络RTK技术克服了普通RTK测量中基准站与流动站间距的局限,它的有效距离可以达到几十甚至上百千米,覆盖面广阔,定位精度高,可靠性强。这是GPS网络RTK技术能够快速发展的原因之一。本文以淮南某用地勘测定界项目为例,研究探讨了GPS网络RTK用于土地勘测定界及精度分析的方法,得到了一些有益的结论。     

Application of 55 multi-dimensional tectonomagmatic discrimination diagrams to Precambrian belts

Fifty-five new multi-dimensional diagrams, mostly based on log-ratio transformations, were used to decipher tectonic settings for 17 cases of Precambrian belts in Canada, the USA, Poland, Finland, Jordan, Democratic Republic of Congo and Zambia, China, and India. The results of different sets of diagrams for basic-ultrabasic, intermediate, and acid magmas were generally internally consistent. Possible reasons for some inconsistencies may be related to the use of a sample group of mixed ages because of their uncertainties, extreme element mobility caused by metamorphism especially of high-grade type, analytical data quality, different petrogenetic processes for basic to acid magmas such as mantle versus crustal origin, and some deficiencies that still exist in the multi-dimensional diagrams. To partly overcome the last problem, one new multi-dimensional diagram is proposed and used to discriminate mid-ocean ridge and oceanic plateau settings.     

Plate tectonic settings for Precambrian basic rocks from Brazil by multidimensional tectonomagmatic discrimination diagrams and their limitations

Multidimensional discrimination diagrams (2006–2011) for basic and ultrabasic igneous rocks were applied to Precambrian rock suites from the Amazonian and São Francisco cratons, and the Tocantins Province, Brazil, to infer their possible tectonic settings. The chosen study cases in the Amazonian craton include the ca. 3.0 Ga metabasalts of the Identidade greenstone belt, 1.87–1.80 Ga Parauapebas anorogenic basalt-rhyolite dikes, 1.86–1.82 Ga Rio Branco anorogenic gabbro-basalt association, ca. 1.76–1.74 Ga Aripuanã and Teles Pires intracratonic basalt-felsic volcanic associations, and 1.76–1.74 Ga Jamari and 1.60–1.53 Ga Serra da Providência arc-related gabbroic rocks. In the São Francisco craton, we selected 1.48 Ga arc-related amphibolites of the Rio Capim greenstone belt, continental mafic dikes of Uauá (2.6 Ga), Curaçá and Chapada Diamantina (1.5 Ga), and Espinhaço (ca. 1.0 Ga). In the Tocantins Province, ca. 3.0 Ga komatiites associated with oceanic basalts of the Crixás and Guarinos greenstone belts were studied. The application of the diagrams generally provided consistent results with the authors’ proposed tectonic settings based on field relationships and geochemical data. The exceptions are some within-plate (continental) mafic dikes and basalts for which our diagrams do not work well. For comparison, we also used two ternary and two bivariate traditional discrimination diagrams for the data from the Amazonian craton, whose results were poorer than the newer multidimensional diagrams.     

基于TTG软件的CORS实时坐标转换服务的建立

连续运行卫星定位服务系统（Continuously Operation Reference System,CORS）改变了传统的基于大地控制网的测绘作业模式,以集中网络化的方式向用户提供实时和事后的精密定位服务.但是目前CORS坐标转换的实时性不足、精度不均匀等问题,通过计算区域转换参数和建立高程改正格网来提供基于CORS的实时坐标转换服务.本文以TTG（Trimble Transformation Generator）软件应用为例,基于TrimbleCORS系统,实现区域实时坐标转换服务,将实时坐标转换点和该区域已有控制点进行比较,从而更好地评定TTG软件应用的实际效果,同时对CORS安全服务技术的研究,提供一定的参考基础.     

房产权证附图的自动配制研究

随着房地产事业的发展,房屋交易越来越频繁,产权产籍系统对测绘成果的需求是越发紧迫,实现权属信息与测绘成果尤其是图形信息的关联可以有效解决房产证附图自动制图的需要。本文通过研究与实践,实现了BMF系统与产权产籍系统的快速关联,为房产权证附图的自动制图提供了便捷的实现方法。     

ITRF2008框架下VLBI与GPS确定地心坐标的精度分析

为了解ITRF2008框架下VLBI和GPS两种空间技术确定地心坐标的真正实现精度,在并置站上对VLBI和GPS两种空间技术测定的地心坐标进行了比较,经过偏心改正和七参数转换之后,得到两种空间技术地心坐标不符值的加权中误差,其可以认为是这两种空间技术的真正实现精度,经比较分析这两种地心坐标三个坐标轴方向分量的外符精度都在10mm之内,说明VLBI和GPS确定的地心坐标精度已达到毫米级。     

基于 IGS 参考站的 CGCS2000坐标系控制测量探讨

为了使新疆某铜矿1980西安坐标系转换到2000国家大地坐标系（CGCS2000）,利用IGS站数据进行GPS联测,通过GAMIT/GLOBK等专业软件进行基线和坐标解算,实现1980西安坐标系向WGS-84坐标系再到CGCS2000坐标系的转换。     

基于ArcGIS的80西安坐标系转换到2000国家坐标系的研究

2000中国大地坐标系(CGCS2000)是我国新启用的地心坐标系,但我国目前用以测图及工程规划、设计以及其他用途的地图坐标系一般又都是基于北京54坐标系或1980西安坐标系。如何将这些坐标系转换到2000国家坐标系是当前必须解决的问题。本文就西安80坐标系到2000国家坐标系之间的转换的基础理论和方法进行了研究,给出了基于ArcGIS环境下将1980西安坐标系转换到2000中国大地坐标系的有效解决办法。