plotted name string with too many names

[Michael Hans]

first many thanks to Dustin who gave me some first aid for fixing some things

i could get the coordinates reasonable right with 
solve-field --scale-units focalmm --scale-high 20 --crpix-center --downsample 2 --overwrite image_file.jpg

still funny is that without "--downsample 2" it may fail, funny because it doesn't matter how large the file is, whether it is 6000px wide or 2000px wide, without downsampling it takes time and might fail, so there is some other magic in downsampling?


and the plotted result with
astro-plot --tcolor=grey --valign=C --halign=C --ms=0.01 --no-grid --no-ngc wcs_file image_file result_file

https://drive.google.com/file/d/1QEhRk6kLXk8bJuzXoTZWYkwvbtQwVcaz/view?usp=drive_link

happens that now I like to reduce the multi-names to just one star name to make it readable, certainly it doesn't matter for me which it is, I don't need scientific correctness

I thought I could fix it in plottann.py limiting to the first name in the array, but seems it is not enough

some help there, like quick fix? is it coming from the catalogs, or have I overseen something ?

thanks

[Dustin Lang]

Hi,

I think you will either need to edit the data file that has those names in it:

https://github.com/dstndstn/astrometry.net/blob/main/catalogs/brightstars-data.c

or change the code for how the labels are plotted (this is in C):

https://github.com/dstndstn/astrometry.net/blob/main/plot/plotannotations.c#L328

either way, you would then have to re-run "make" to recompile it.

cheers,

dustin

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[Michael Hans]

oh, I see, I should have asked before fiddling with the py script :)

but ok, now I understand it better

how is it done when submitting online to astronomy.net, there I get a quite crowdy, but still readable plot for images made with up to 28mm lens, only brighter stars from images 24mm and almost only constellation lines on photos made with 20mm lens, can you say?

[paul.l...@gmail.com]

Some "magic with downsampling?" I have discovered is that it tends to get rid of bright pixels which may just be noise and which confuse the source extraction. No idea whether this is applicable in your case. Because my images are oversampled I tend to use "-z 4" to reduce the size of the image and the number of detections.

[Michael Hans]

after thinking it over, I guess the data files shouldn't be touched, would be too specific 

the plotannotations.c has string.h already included, so it would be easy to trim the label to first word, but guess it also wouldn't be very wise

instead, trimming the label in plotann.py with something like

"unique_starname = label.split(' ', 1)[0].split('/', 1)[0]"

would be more flexible and eventually useful to create a routine to make it a new option

any thoughts?

On Saturday, September 23, 2023 at 4:21:08 PM UTC-3 dstn...@gmail.com wrote:

[Michael Hans]

interesting, I will try that
thanks

[Dustin Lang]

Hi,

I just committed a change (including some changes to the "plotstuff.i" that will mean you have to "make py" to rebuild it) that shows how you could move the bright-star plotting into the plotann.py layer.

https://github.com/dstndstn/astrometry.net/blob/main/plot/plotann.py#L407

This plotting code is a bit complicated, because there is a C layer called "plotstuff", that is wrapped so it can be used from Python, using Swig in plotstuff.i, but also with another Python layer in "plotstuff.py"!

Hope that helps,

--dustin

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[Michael Hans]

something must have gone wrong, solve-field now returns 
solve-field.c:149:append_executable Error, couldn't find executable "astrometry-engine"
path is ok
doesn't matter executing within astrometry/bin, or any other possible way, inparallel enabled or not 

about plotann.py which works
I was there already, but still certain names are with 2or 3 names separated with / like Betelgeuse for example
kind of stuck on this 

https://drive.google.com/file/d/16qCSA3ZTcslI4njI-wvF6ZYy545gyZnm/view?usp=sharing