高斯正反算投影代码

gis矢量切片制作工具不依赖于商业gis平台，可将shp、或存储在postgis中的空间数据生成geojson格式的切片文件，同时可进行切片文件的分级设置。

在地理信息系统数据中，有些数据储存过大，要进行压缩！-In the geographic information system data, some data is too large to be compressed!

Navit is a open source (GPL) car navigation system with routing engine. It s modular design is capable of using vector maps of various formats for routing and rendering of the displayed map. It s even possible to use multiple maps at a time. The GTK+ or SDL user interfaces are designed to work well with touch screen displays. Points of Interest of various formats are displayed on the map. The current vehicle position is either read from gpsd or directly from NMEA GPS sensors. The routing engine not only calculates an optimal route to your destination, but also generates directions and even speaks to you.

不用注册就可以完成各种常用的地图投影：UTM、Albers、高斯、兰勃特、墨卡托等几十种投影，以及它们之间的相互转换；数据处理方式多样：单点、多点、文件方式；椭球可选；注册后功能更多。 -Registration can be completed without a variety of commonly used map projection: UTM, Albers, Gauss, Lambert, Mercator, etc. dozens of projection, and their mutual conversion data processing and diverse ways: a single point, multi-point , paper ellipsoid optional register more after the function.

visual basic +mapobject 编写的索引图和放大窗口代码_VB-visual basic mapobject prepared by the index map and enlarge the window code _VB

一个汽车GPS导航系统,非常有价值,内有源代码,能在VC6下直接编译运行-A car GPS navigation systems, is very valuable, with the active code, can direct the compiler to run under VC6

将不规则三角网（TIN）转换为Point输出-will TIN Network (TIN) converted to Point output

应用背景随着地震勘探精度的提高,各向异性对于常规克希霍夫叠前深度偏移效果的影响已不容忽视.研究了利用P波非双曲旅行时求取各向异性参数的方法,当道集的排列长度远大于勘探目的层深度时,P波走时资料包含的信息可以用来确定VTI介质的各向异性参数关键技术利用VTI介质的CMP道集,研究了二步法提取η参数的方法,即先利用短排列地震数据求取均方根动校正速度,再利用长排列数据和水平速度扫描法得到水平速度,通过转换得到各向异性η参数；采用基于声学近似的VTI介质程函方程,通过各向异性射线追踪计算旅行时

ArcEngine9.2和VB实现的地图编辑的功能，类似于ArcGis9.2地图编辑的功能，对要实现地图编辑功能的兄弟们来说非常有帮助，觉得有帮助的人一定要顶哦，记得要修改数据路径。-ArcEngine9.2 and VB realize the function of a map editor, map editor ArcGis9.2 similar to the function to be realized for map editing features brothers for the very helpful, I feel that help must be the top Oh, remember to amend data path.

GIS核心算法之一,线缓冲区生成,生成速度较快,效果也不错-GIS, one of the core algorithm, line buffer generation, to generate faster results would be good