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WebGIS从基础到开发实践书和源码
WebGIS从基础到开发实践配套的源代码,60个应用实例,HTML5与CSS3的全面介绍与深入应用。配套源代码,很实用的;WebGIS从基础到开发实践的内部案例文档,里面包含WebGIS从基础到开发实践的基础案例,适合新手。
2016-12-29
RTCM32标准文档格式定义
This standard has been developed by RTCM Special Committee 104 as a more efficient alternative to Version 2 in various documents entitled "RTCM Recommended Standards for
Differential Navstar GPS Service, Version 2.x”. Service providers and vendors represented on
the SC-104 Committee requested the development of a new standard that would be more
efficient, easy to use, and more easily adaptable to new situations. The main complaint was that
the Version 2 parity scheme, which uses words with 24 bits of data followed by 6 bits of parity,
was wasteful of bandwidth. Another complaint was that the parity was not independent from
word to word. Still another was that even with so many bits devoted to parity, the actual
integrity of the message was not as high as it should be. Plus, 30-bit words are awkward to
handle. This standard, Version 3, is intended to correct these weaknesses.
2016-03-30
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