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From previous ObsParis / CDS meeting

Using Aladin prototype v10 (6/6/2017) on MacOS

Mars HiPS generation

• In Aladin, load file Mars_MGS_colorhillshade_mola_1024.jpg

(MOLA integrated relief map)

• Go to Image > astrometric calibration:

Coord = 0.,0.
pos x/y = 512, 256 (lon = 0°, lat = 0° at image center)
size = 21.1' (= 360. / 1024)
Equatorial, Cartesian
Symetry: No => 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

MOC use case

- Load Mars MOLA hpx in Aladin

- Select two large craters in Mars Craters service from VESPA client

- send as s_region from VESPA client (in Aladin) - s_region currently provided in this service as with W longitude, so this will work

- select them in Aladin with pointer

- Generate common MOC for these 2 craters (Coverage > Generate MOC > from objects)

This works

• Then: test intersections with something else.

How do we do that?

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