xieyongchao2

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I found this line of code in this file [Heightgraph.js](https://github.com/nrenner/brouter-web/blob/master/js/plugin/Heightgraph.js#L170)。But I didn't find what this function did

OK, I see, but I also want to know how to make this elevation chart on Android?

Hello, [I see this line of segmented code.](https://github.com/alexcojocaru/geo-data-exchange/blob/cb103a1c2e9b0adbabf4851d34474f3a76e9f277/src/index.js#L184) What is [“if this point doesn't have a valid alt.”](https://github.com/alexcojocaru/geo-data-exchange/blob/cb103a1c2e9b0adbabf4851d34474f3a76e9f277/src/index.js#L184) How is this data generated?