Video file projection

Tips and tricks for using Geocart 3
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Bernhard Jenny
Posts: 12
Joined: Thu Mar 22, 2012 6:22 pm

Video file projection

Post by Bernhard Jenny » Thu Nov 27, 2014 3:23 pm

daan,

Is there a way in Geocart to project a video file from Plate Carrée to another projection?

Thanks,
Bernie

daan
Site Admin
Posts: 721
Joined: Sun Mar 29, 2009 12:17 am
Location: Seattle

Re: Video file projection

Post by daan » Fri Nov 28, 2014 12:21 am

Hello Bernie.

By “video file”, do you mean a video clip, where many frames in the video clip consist a map in plate carrée projection? And you want the output to be a video clip also?

Or…?

Best,
— daan

Bernhard Jenny
Posts: 12
Joined: Thu Mar 22, 2012 6:22 pm

Re: Video file projection

Post by Bernhard Jenny » Fri Nov 28, 2014 10:06 am

Hello daan,

Yes, that is what I was thinking of. A batch process that can read, project, and write individual frames in numbered raster images would work as well. This would be useful for video maps such as this one: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11719

Here is an interactive version I am working on (very much work in progress): http://cartography.oregonstate.edu/demo ... /NASA.html
I wanted to explore whether streaming a video map with an equal-area projection instead of the Plate Carrée has a significant enough impact on file size to justify the development of some extra web client logic. The web client would first inverse project the video to spherical coordinates before forward projecting to an interactive pointed polar equal area projection (currently Hammer).

Thanks,
Bernie

daan
Site Admin
Posts: 721
Joined: Sun Mar 29, 2009 12:17 am
Location: Seattle

Re: Video file projection

Post by daan » Fri Nov 28, 2014 12:58 pm

Bernie,

Geocart has no such facility. Cracking open arbitrary video formats would be unfeasibly complicated, so instead I’ll add “batch-processing of individual image files of identical projection” to the Wish List.

Thanks.
— daan

Bernhard Jenny
Posts: 12
Joined: Thu Mar 22, 2012 6:22 pm

Re: Video file projection

Post by Bernhard Jenny » Fri Nov 28, 2014 2:19 pm

Thanks, daan. This would be a useful feature.
Bernie

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