关于地理信息系统在卫生领域的应用

应用背景在物力大地测量学中，重力异常的计算，需要测量计算点的重力值和计算测量点的正常重力。计算正常重力时，需要已知计算点大地坐标，即经度、纬度和大地高，如果采用GPS采集数据，那么获得的大地坐标的参考椭球是WGS84。关键技术此程序，采用WGS84参考椭球参数，因此输入数据为WGS84大地坐标，顺序为，纬度、经度、大地高。输入文件为，Input.dat。输出文件为，output.txt。计算结果为，椭球面以上高程为h处的正常重力。如果将大地高设为0，那么计算结果为此点处参考椭球面上的正常重力。

一个安监局的例子，用VB开发的工程。使用控件是mapx4.5。-Examples of a Work Safety Supervision Bureau, with VB development project. The use of controls is mapx4.5.

色调均匀，暗红或黑色，分布于河岸处，形状规则。 红或深绿色，有纹理结构和明显的灌渠，形状规则，分布于河谷、河流两岸冲积平原。 -uniform colors, or black dishes, distributed in the bank, the shape of the rules. Red or dark green, texture and structure of the irrigation channels clear shapes and distribution in the valley, rivers alluvial plain.

mapgis二次开发dll函数，vc++6.0制作-mapgis secondary development dll function, the production of 6.0 vc

本文结合DCT变换的特性，利用分形的Peano一hilbert扫描曲线，对基于DCT变换的图像编码方法进行了研究，并提出了改进方法。主要工作分为两个部分: 一是在分块DCT基础上的改进。对分块后生成的各图像块矩阵，不直接作二维DCT变换，而是先进行扫描，使之重排成一维向量，再进行一维DCT变换，这样可以减少运算量。 其次是对层次余弦变换编码部分的改进。使用层次DCT变换与零树编码相结合的方法，并在扫描编码过程中，按Peano一hilbert扫描顺序进行编码。这样不仅可以减少“块效应”，而且可以加快编码速度。-this paper the characteristics of DCT, using fractal Peano a Hilbert scanning curve, the DCT-based image coding method for the study and improvement of methods. The work is divided into two main parts : First, the DCT block on the basis of improvements. Right after block production of the image block matrix, not for direct two-dimensional DCT, but first scan, so they line up in a heavy-dimensional vector and then a peacekeeping DCT, thus reducing the amount of computation. Secondly, the level of cosine transform coding some of the improvements. The use level of DCT and zero tree coding combination of methods, coding and scanning process, according to a Hilbert Peano code scanning sequence. This will not only reduce the "blocking

用Visual C++开发的一个坐标转换系统大家打开看看就知道了-Visual C development of a coordinate transformation system opened see in the know

灰度等值线图matlab实现 灰度等值线图matlab实现1-gray contour map Matlab to achieve gray contour map to achieve a Matlab

vb+mapX写的切图工具。可以将gst文件散列为地图png图片-vb+ mapX cutting tool written. GST documents can hash to map png picture

这个程序源码实现了mapx的绝大部分功能，非常经典！！并且我增加了一个重要功能，网上有许多人提出了这个功能，但是没有很好的解决。修改后，可以实现图层的动态移动，在创建折线时，当鼠标位于窗口边缘时，图幅自动平移，就像mapinfo一模一样的效果，并非简单的移动视图中心。当然你可以根据需要将功能扩充到在画直线、画多义线、画多边形的时候实现动态移动。具体功能与说明请下载后参阅ReadMeFirst。-the process to achieve the source of most of the functionality MapX, very classic! ! And I added an important function, the Internet has made many of the features, but not a very good solution. After revisions, the layer can be achieved for the dynamic movement, in the creation of dogleg, when the mouse is located at the edge of the window, maps automatic translation, like MapInfo exactly the same effect, is not a simple mobile View Center. Of course, you may need to expand the functions of the painting straight line paintings, the paintings polygon Dynamic Mobile. The specific function and description of downloading information ReadMeFirst.

读写中国地球空间数据交换格式源码-read and write Chinese geospatial data exchange format FOSS