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March 17, 2009

这么多东西都堆到一起了。最近看别人的blog多,自己写的少,一个原因是,我在做一个小玩具网站:schooldistrictfinder.com ,就牵涉到上面说的这三件事情。

这个东西是我07年就在考虑的一个东西,当时因为要买房子的关系,一直在关注房子和学区的关系。在美国,象我这样的已婚有娃IT民工,如果想自己的娃将来有学上,唯一的办法就是住在一个好的学区里面。我当时在很多网站上面找关于学区和学校的数据,但是都很零散,于是就想自己做一个能把所有学区和公立学校数据放在一张地图上的网站,拖了这么久,域名和空间都注册了好久,终于下定决心弄了一下。好在没有花太多的时间。

这个小玩具,就是一个典型的用Saas的例子。我用的是google map api。没错,我经常骂google,那是因为我觉得google如果垄断了,就太可怕了,所以我才骂它。到了开发的时候,什么好用就用什么。这里的地图数据,以及画多边形(学区边界),还有图钉(学校地址),都是用的google map api。我在开发的时候还用到了google map api的地理编码/反编码(geocoding / reverse geocoding)来修正数据。如果你把这个网站看做是一个软件的话,google map是作为一个web service来提供地图数据的,我写的部分是作为另外一个(超小型的)web sevice来提供学区和学校数据的。最近微软的live地图服务也升级了,我还没有时间去研究那边的兼容问题。

要做这个网站,我就必须把google map的代码放到我的网站上。我很高兴这么做,因为google map api为我的网站提供了价值,却没有太多的条件来制约我。当然如果流量大了,他们会跟我谈广告的事情,不过那就是猴年马月的事情了。另外这个服务很容易验证是否合格:都是下载的数据,没有什么计算在里面。这个有点象混黑社会:跟某个老大的条件是,吃香的喝辣的,横行乡里,老大最多跟你分点保护费,多么简单而幸福的混混生活。

跑题了跑题了,现在说说中国的谷歌地球。我看到最近国内在号称要做中国的谷歌地球,其实做这个东西,或者做google map,最重要的是数据,写个桌面应用,或者写个javascript + css + html的网络应用,倒不是什么难事。有了数据,这些程序才有料去显示,其他的鼠标拖动,level of details显示之类的效果,才有存在的意义。中国的地图数据,估计要确定哪里可以显示多少细节,还没有完全确定吧。

做这种应用另外一个不可缺少的,就是开发接口。这种接口可以是google map api这样为写程序的人建立的复杂接口,也可以是为某些地理知识爱好者添加标记的人机接口。有了接口才有用户喜欢玩,才能添加各种数据,这个应用才更有用:用的越多越好用,歪脖2.0的一个经典特征。

最后炫耀一下一个小发现,其实google map用的地图也是有误差的,我经常发现某些学区的边界没有落在一条街上,而是落在人家的院子里,我本来以为是我的数据的偏差,但是切换到卫星图片一看,我画的那个边界,明明就在那条街上嘛,是google map的地图视图(map view)数据的问题。

6 Comments »

  1. “google map用的地图也是有误差的”,此问题多年来一直存在。
    请参考:
    “在中国,卫星图层和地图图层之间有 500 米误差,方向也是固定的。”这是出于众所周知的政府军事保密原因。http://fisio.cn/google-maps-inaccuracy-fixed.html

    “上述问题中的主要原因是国内地图服务商所使用的地图需要经过中国测绘机构的数据加密处理,反映到地图上相对真实坐标会有偏差,但基于此地图的所有数据都经过相同的处理,因此不会影像用户的应用。但如果要把数据发布到 GoogleEarth中,由于GE本身的卫星影像没有加密处理,同时本身的精确度也不是很高,因此数据就会出现偏差了。
    ”http://bbs.mapabc.com/post/view.htm?bid=5&id=265&sty=1&tpg=3&age=30

    Comment by 郑昀 — March 18, 2009 @ 3:42 am

  2. 不错,不过在我移民美国之前对我没太大用处

    来看看我的http://www.zmap.org 你可以添加一些你在美国居所附近的地点,不过别用英语,以后有英文版再说

    Comment by tinyfool — March 18, 2009 @ 7:37 am

  3. tiny,你如果能让地图切换到普通地图模式就好了,卫星图片看着晕。

    Comment by 美人她爹 — March 18, 2009 @ 9:56 am

  4. 中国的地图数据有偏差,而且差得太远了

    Comment by tinyfool — March 18, 2009 @ 11:05 pm

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