Are you sure you are talking about a hologram? They are only interference patterns. They will reconstruct an image if illuminated with coherent light. They can be quite amazing (I've seen some doozies), but they are only a virtual image arising from the interference pattern. I've seen a full-color, daylight reflective hologram with barely perceptible speckle. That was in the mid-1970s.
There may be tricks to projecting 3D images, which are not holograms, and I would be interested in them. 3D movies use stereography to good effect. The Disney Haunted Mansion used a semitransparent mirror to reflect ghost images over the fixed set background.
Steering an image on a fixed screen (oblique) from a moving satellite through a refractive medium is far more challenging than taking overhead photography. When a cloud layer obscures the light source, the image would shut off. I speak from experience at working the problem of steering and focusing laser beams for target engagements. Not nearly as complex as projecting an image, and one hell of a ball-buster problem to solve successfully.
I gather you haven't done any calculations on pixel size based on projected spot size, jitter, and depth of focus irregularities.
Another approach is a "rain" of micro-LEDs as small aerosol particles, programmed to turn on or off according to color based on instructions beamed to them relative to a GPS-determined spatial grid. That was one invention concept I submitted a long time ago, but my company deemed it outside of their business model.
Are you sure you are talking about a hologram? They are only interference patterns. They will reconstruct an image if illuminated with coherent light. They can be quite amazing (I've seen some doozies), but they are only a virtual image arising from the interference pattern. I've seen a full-color, daylight reflective hologram with barely perceptible speckle. That was in the mid-1970s.
There may be tricks to projecting 3D images, which are not holograms, and I would be interested in them. 3D movies use stereography to good effect. The Disney Haunted Mansion used a semitransparent mirror to reflect ghost images over the fixed set background.
Steering an image on a fixed screen (oblique) from a moving satellite through a refractive medium is far more challenging than taking overhead photography. When a cloud layer obscures the light source, the image would shut off. I speak from experience at working the problem of steering and focusing laser beams for target engagements. Not nearly as complex as projecting an image, and one hell of a ball-buster problem to solve successfully.
I gather you haven't done any calculations on pixel size based on projected spot size, jitter, and depth of focus irregularities.
Another approach is a "rain" of micro-LEDs as small aerosol particles, programmed to turn on or off according to color based on instructions beamed to them relative to a GPS-determined spatial grid. That was one invention concept I submitted a long time ago, but my company deemed it outside of their business model.