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HiPS (Hierarchical progressive survey) are associations of healpix maps at different scales. They provide efficient multiresolution scaling on the fly in Aladin.

1) In Aladin, load file

Derived from Io use case: Aladin & planetary surfaces

In AlLoad file Mars_MGS_colorhillshade_mola_1024.jpg (MOLA integrated relief map)

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Coord = 0.,0.
pos x/y = 512, 256 (lon = 0°, lat = 0° at image center)
size = 21.1' (= 360. / 1024)
Equatorial, Cartesian
Symetry: No RA symmetry = False   => this is mandatory to get the image in the correct orientation. But this currently provides a W longitude frame (entering Yes results in a reverse image (seen from the inside), not in a reverse frame).

Edit > properties:  ascending longitudes - does not change anything here

• Convert to HiPS :

Tool > Convert current image to a HiPS

• The hpx image should be saved on disk automatically

Problem: this provides a correct E longitude frame. However, s_region footprints sent from an EPN-TAP service will now plot at the wrong longitude (see figure below)

E.g. for Huygens crater, s_region = Polygon UNKNOWNFrame 55.582 -17.8305918846 54.7737623408 -17.7532983656… 

(s_region frame incorrectly assumed W-handed)

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2) From a series of local files in Aladin

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• Then: test intersections with something else.

How do we do that?

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