What would you like to see us add to this API?

When street view receives a request for an image at a location where no image is available, it returns HTTP code 200, and a grey image of the requested size saying "Sorry we have no imagery here".

It would be helpful to provide either:

1. An alternative API call to initially check if imagery exists at a location. Eg:

http://maps.googleapis.com/maps/api/streetview_image_exists?location=56.960654,-2.201815

streetview_image_exists returning json with either YES or NO.

2. An HTTP status code other than 200 to indicate that imagery is not available at the given location.

In some sense, this is really a 404 file not found case, but I can understand the value of returning some form of image to act as a placeholder on a web page. 

3. An alternative API call to get the current "Sorry no imagery exists here" image at a specified image size. This would allow users to check the downloaded image against the standard error image (should it change in the future) to see if they had requested an image from a location without imagery. Eg:

http://maps.googleapis.com/maps/api/streetview_no_imagery_image?size=640x200

streetview_no_imagery_image returning the "Sorry no imagery here image of the requested size.

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