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Street View stitches together billions of panoramic images to provide a virtual representation of our surroundings on Google Maps. Street View's content comes from two sources - Google and contributors. Through our collective efforts, we enable people everywhere to virtually explore the world.

A. G. WHITE, C. P. SMITH, N. R. HECKENBERG, H. RUBINSZTEIN-DUNLOP, R. McDUFF, C. O. WEISS and CHR. TAMM,J. Mod. Opt. 38 (1991).

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Phase singularities in an optical field appear as isolated dark spots and can be generated in active laser cavities or by computer generated holograms. Detection and categorization of these singularities can easily be achieved either by interferometry or Fourier transform pattern recognition using a computer generated hologram.

Heckenberg, N.R., McDuff, R., Smith, C.P. et al. Laser beams with phase singularities. Opt Quant Electron 24, S951–S962 (1992). https://doi.org/10.1007/BF01588597