中文

GPS is great when you’re doing outdoor activities, but coming back to your computer, it’s sometimes a little bit tricky to use the output data, in my case, namely the KML / KMZ file.

Indeed, the GPS terminal records coordinates, altitude & other info each X seconds. It means that if you record your track for a time with a high rate recording frequency, your KML file is going to include thousands of points…

Everything is fine with Google Earth when you import your KML file, but some issues appear when you wanna import it in Google Maps (for instance, the tracks will split in several parts).
Indeed, if your KML polygons have too many points, the file will be too big for Google Maps.
Only one solution: reduce the number of points (and coordinates).

Here comes GPSBabel.

GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
For instance, in order to reduce the number of coordinates, you just have to apply one of the filters:

It’s free and it works under Windows, MacOS and Linux!
 
 
Source:
http://www.gpsbabel.org/download.html
 
 
 
 
 
 
 
 
 
 

处理太大的GPS KML文件

你在做户外的活动的时候，GPS好用但是你回来在你的电脑有的时候一点难用输出的数据（KML和KMZ文件）。。。

其实，GPS终端机记载坐标，海拔和别的数据每个X秒。这个意思是如果你记载一段时间用一个高记载的速率，你的KML文件会包括成千的坐标。。。

你输入你的KML文件的时候，没有问题跟Google Earth，但是错误发生跟Google Maps（比如说，路线分为几个部分）。
如果的的KML的多边形有太多坐标，那个文件会太大为Google Maps。
只有一个解决：减少坐标的数量。

GPSBabel来了。

GPSBabel软件可以格式之间转换，除了格式转换之外，还有过滤waypoint的功能，例如可以将重名的、距离很接近的waypoint过滤掉，或者是只输出某个座标范围内的waypoint。
比如说，为减少坐标的数量，你只需要应用一个滤波器：

这是免费的软件，而且可以用在Windows，MacOS和Linux！
 
 
来源：
http://www.gpsbabel.org/download.html
 
 
词汇：
户外 = hù wài = outdoor
终端机 = zhōngduān jī = terminal
输出 = shū chū = to export
数据 = shù jù= data
记载 = jì zǎi = to record
坐标 = zuò biāo = coordinates
海拔 = hǎi bá = elevation, altitude
速率 = sù lǜ = speed, frequency
成千 = chéng qiān = thousands of
减少 = jiǎn shǎo = to decrease, to reduce
数量 = shù liàng = amount, number
滤波器 = lǜ bō qì = filter