I realized that GraphicsMagick offers a simple way to prepare images for Streetview. The software runs on a large number of operating systems. An alternative is ImageMagick.
Panorama image my_panorama.jpg, sized 18432×9216 px (360° horizontally, 180°
vertically), stitched with ICE.
360cities: panoramas can be viewed on desktop, iPhone, iPad and in Google Earth.
If you want a more customized panorama or virtual tour (many panoramas connected), krpano would be the best option.
Google Maps has a repo on GitHub that can convert Android's Sphere Images to Street View: https://github.com/googlemaps/streetsphere and it also has an ...
No, MS ICE does not have a lens database AFAIK. It really does not matter much since it has to distort the images to make features match and perform blending. In my experience success is generally high but not perfect. I would try straight with ICE first because any processing you do before hand always adds image quality loss. If it fails, then try it after ...
There is no such limit in ICE. You should be able to the output scale to 100% just before you export. It will give you the maximum resolution possible for your panorama. I often use ICE to make panoramas initially since it is so easy and go to something more sophisticated if it fails. There might be a limit IIRC but it is beyond 19K.
I found the tutorial How to upload non-android 360 panoramas to Google Maps and successfully uploaded a spherical panorama into Google+. I haven't took the step to publish it on Google Maps, but I guess for private sharing, G+ is better.
Note the spherical icon on the thumbnail.
Basically, we have to:
turn on the option "Upload my photos at full size" on ...