Query GOST at depth 7

[BerryHoll]

During the third community workshop of GaiaUnlimited it was discussed that we should increase the available depth of sampled nominal scan-law data from GOST to at least level 7 (196608 positions on the sky) which provides a 'pixel size' (or more accurate: typical distance between the sampled positions) of about 0.46 deg, which is roughly half the across-scan size of the FoV (which is about 0.7 deg), and therefore can be used to reasonable degree to estimate the expected observations of any point on the sky.

Due to GOST online limitation of 10k sources per run, the data was queried in 20 separate queries, which were thereafter concatenated. In the following post I'll include the script that was used to prepare the run samples, and that does the post-run concatenation.
Note that GOST is queried for the full possible time range 2014-07-25T10:31:26.000 - 2025-06-01T00:00:00.000. Gaps and DR time cuts thus have to be applied afterwards.

For completeness here a reminder of the HEALPix depth versus pixel size and number of pixels:

HEALPix depth	pixel size [deg]	# pixels
0	58.63230143	12
1	29.31615071	48
2	14.65807536	192
3	7.329037679	768
4	3.664518839	3072
5	1.83225942	12288
6	0.91612971	49152
7	0.458064855	196608
8	0.229032427	786432

[BerryHoll]

Attached zipped file :
equHpx0-7GeneratedIndices.zip

• contains Python notebook: equatorial_healpix_positions.ipynb that was used to generate the files with HEALPIX indices in both next and ring index, as well as the max-10k source (header-less) files that can be 'fed' to GOST directly. A readme is included with some additional information.
• The attached files were generated for HEALPix level 0 till 7.

The (DPAC-level) GOST queried data (HEALPix level 0 till 7) will be shared privately with @alfredcas and @agabrown for further processing to be incorporated within the GaiaUnlimited code.

I think that with this action we can consider this issue closed.