Look into how Doppler Radar creates top down images from ground based radar.
I don't need to learn about radar from YouTube or Wikipedia.
Pulse Doppler radars for detecting and mapping rain are terrestrial and operate in the X-Band. They don't produce photographs either. Their product is turned into graphical presentations, overlaid on a map or photo image from another source (satellite).
Here's what the video you linked to me showed was a Doppler weather product. Does it look photo-realistic to you?
Sometimes, weather reports will lay that kind of product over a composited satellite image. Don't confuse that imagery with what the doppler radar is providing.
OTH radar is something entirely different. They are much lower in frequency (longer wavelength) and utilize groundwave or skywave principles to see over the horizon. They don't detect precipitation the way doppler radar does. They see through rain. X-Band doppler radar doesn't, which is why it's used for meteorology. (X-Band doppler also has no over-the-horizon capability).
However OTH radars are used to help data input to meteorology (I don't know how, exactly; I'm only familiar with military uses), but it's an entirely different type of radar from microwave doppler radar.
Besides, neither produces photographic-quality images. No algorithm is used to take radar images (OTH or doppler) and assemble a pseudo-photographic-like product. There are ways for synthetic aperture or ISAR radar to create a visual image with greater detail of an object, but you'd never mistake it for a photograph and it's not used for weather or creating atmospheric images of earth.