Comments on: Polylines in Google Maps [Part 1]

By: purva

purva — Fri, 05 Feb 2010 06:52:37 +0000

how to get an array of latlong of intermediate points?

By: Rainbow

Rainbow — Tue, 05 Jan 2010 08:22:47 +0000

How can I display several PolyLines once a time ?

By: iao

iao — Mon, 04 Jan 2010 17:44:24 +0000

Thank you, this is exactly what I looked for

By: m1co

m1co — Wed, 14 Oct 2009 10:17:07 +0000

Thanks for this cool article. Very informative!

By: Gabriel Svennerberg

Gabriel Svennerberg — Fri, 27 Feb 2009 15:37:22 +0000

Suresh: I make an AJAX call from the web page with the map to an URL that returns the Encoded Polyline in JSON format. Check out Polylines in Google Maps [Part 2] to see how you add it to the map.

If you’re using the ASP.NET MVC Framework it’s extremely easy to return objects as JSON. Check out the article ASP.NET MVC and JSON to see how it’s done. If your not using the MVC framework you can still do it, it just takes some more work.

By: suresh

suresh — Fri, 27 Feb 2009 11:37:56 +0000

How to pass the encoded polylines to google map in C#.

By: Gabriel Svennerberg

Gabriel Svennerberg — Tue, 10 Feb 2009 07:08:42 +0000

I’ve read about a tool called GE-Path in the article Drawing Grids, Paths And Polygons In Google Earth Using GE-Path which makes it easy to draw a grid on a map. Maybe that’s something you can check out. Otherwise I suggest that you simply draw a bunch of polylines in a grid pattern.

If you just want a grid that has nothing to do with coordinates on the map but is a part of the UI, you could probably just make an image and put it on top of the map with the help of CSS.

By: Nast

Nast — Mon, 09 Feb 2009 23:03:23 +0000

i wanna draw grid on maps how can i do it ?
for example maps divide 12 cols and 12 rows
anyone can help me ?

By: Gabriel Svennerberg

Gabriel Svennerberg — Wed, 05 Nov 2008 11:59:44 +0000

@Venkat: I’m glad that I could help!

By: Venkat

Venkat — Wed, 05 Nov 2008 11:43:08 +0000

Gabriel, Thanks for your reply. I already started using it. It works greatly.

Thanks, Venkat

By: Gabriel Svennerberg

Gabriel Svennerberg — Wed, 05 Nov 2008 07:20:38 +0000

@Venkat: You could probably use the Douglas-Peucker Algorithm. It's the same algorithm that's used in the PolylineEncoder to reduce the number of points. /Gabriel

By: Venkat

Venkat — Wed, 05 Nov 2008 05:18:00 +0000

Hi Gabriel,

Thanks for your immediate reply. Is there any algoritham to reduce the coordinates ?

Venkat

By: Gabriel Svennerberg

Gabriel Svennerberg — Tue, 04 Nov 2008 14:48:36 +0000

@Venkat: Keep your eyes open for my upcoming article about how to encode a polyline on the server. That way you can handle bigger sets of data and dramatically boost load times. It should be out in a couple of days or so. But considering how much data you have you could probably remove a lot of the coordinates before even starting to encode it.

P.S I had to look up lakh in Wikipedia, I didn’t know that it means 100.000

/Gabriel

By: Venkat

Venkat — Tue, 04 Nov 2008 11:33:41 +0000

It is really great !

I need your favour

Accuracy is not a big matter for us, we have to load large US block groups which may contain around 1 lakhs coordinates It will be great help if you can provide any logic to reduce the coordinates ?
If I use encoder to load 1 lakh BGPs I am afraid it will fail when user zoom-in.

Please help me.

Thanks
Venkat

By: Gabriel Svennerberg

Gabriel Svennerberg — Wed, 29 Oct 2008 10:50:57 +0000

For sure Pamela, please do!

/Gabriel

By: Pamela Fox

Pamela Fox — Wed, 29 Oct 2008 09:12:04 +0000

Cool article! Can I link to it from the documentation?

- pamela

By: chris Jangelov

chris Jangelov — Tue, 28 Oct 2008 23:01:38 +0000

Excellent posting. Thank you!
/chris