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Retrieving map data as an image for a rosbridge app

asked 2012-09-17 07:09:13 -0500

Pi Robot gravatar image

Hello,

I am programming a javascript/rosbridge move_base interface to use with a tablet and I can successfully retrieve the map metadata by subscribing to the /map_metadata topic. What I need now is the map image data (occupancy grid) in a format that I can use in my javascript program.

Currently I am using KineticJS to load the map image using a URL that points to the .png file that resides on the rosbridge webserver. However, this requires knowing the name of the map file on the webserver and as far as I can tell, this filename is not published by the map_server. So I'd like to get the image directly from the /map topic. I see that map_server provides a service called static_map which will give me the image. But then I'm not sure how to turn this into an image object inside my javascript/rosbridge client.

Any ideas would be appreciated!

--patrick

http://www.pirobot.org

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answered 2012-09-17 15:36:52 -0500

Pi Robot gravatar image

I found a workaround that doesn't require getting the image directly. Instead I set the filename of the map as a parameter in the move_base launch file and then use the rosbridge get_param service to read the filename into my javascript client and KineticJS to get the image from the webserver.

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Asked: 2012-09-17 07:09:13 -0500

Seen: 299 times

Last updated: Sep 17 '12