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Fig. 4

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HiPS of the Spitzer GLIMPSE 360 survey. Top panel: full sky Aitoff projection of the GLIMPSE 360 HiPS, rotated so that the Galactic plane is horizontal and overlaid with a (green) grid of the lowest order ktile = 3 HiPS tiles with their tile index numbers. Note that only tiles that intersect the data are included in the HiPS and that regions of those tiles where there is no data are set to black. Lower panel: magnified view of the HiPS as shown by Aladin overlaid with the approximation of the HiPS tiles as they are projected onto the interactive display. The green grid shows how Aladin constructs the current view from ktile = 3 tiles, where in some parts of the view it is necessary to subdivide the tiles to gain more control points to minimise the distortion related to the bilinear tracing of the data onto the screen view.

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