ArcGIS Coordinate system IDs

最新推荐文章于 2024-04-17 21:58:20 发布

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#system #distance #string #list #api

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本文介绍了地球表面物体位置通过经纬度进行测量的基本概念，并解释了如何将三维地理坐标系统转换为二维投影坐标系统的原理。文中还提到了ArcGIS API支持的空间参考系定义方式。

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The positions of objects on the earth's spherical surface are measured in degrees of latitude and longitude, also known as geographic coordinates. Latitude and longitude are not uniform units of measure; only along the equator（赤道） does the distance represented by one degree of longitude approximate the same distance of latitude.

To overcome measurement discrepancies, data is often transformed from the three-dimensional geographic coordinate system to a two-dimensional planar surface in a projected coordinate system.

Each coordinate system is defined by both a well-known ID (WKID) or a definition string (well-known text [WKT]). The ArcGIS API for Silverlight supports WKID. For a complete list of supported IDs and their corresponding definition strings, see the following:

Projected Coordinate Systems listing
Geographic Coordinate Systems listing

创建一个空间参考系，只需要使用<esri:SpatialReference>标签就可以了，其中wkid 是esri已经定义好的空间参考系的ID，具体ID对应的空间参考可以在http://resources.esri.com/help/9.3/arcgisserver/apis/REST/index.html?gcs.html