Ultra High Resolution Equirectangular Imagery Is the process of creating images that allow for 360 Degree viewing with incredible detail. The original for each of these images have resolutions of over 29,000 pixels on the horizontal dimension. If printed, at standard resolution, these images would be just under 20feet across
You can see in the image below the zoom capabilities of one of these images.
The image appears distorted when viewed without a VR Viewer as it is taking the spherical visual world and placing it on a flat surface the same way a map of the earth distorts the upper and lower reaches of the planet. You can view this image Here to see this image in a 360Deg viewer