（“绘制夜空全天地图”，）
nsb的Python项目详细描述
NSB（夜空背景）
绘制与Krisciunas月光亮度模型相对应的夜空全天图，以及从Gaia公共数据发布目录获得的恒星数据。结果是一个二维像素阵列，每个天空位置都有物理亮度值。
或者估计给定光源在时间范围内的亮度。GAIA数据将通过查询自动下载到相应的ESA服务器。用户刚刚决定要买多少。为了“按名称”调用源并存储它们的位置，nsb包含一个子包“mypycat”。因此需要一个没有提供的目录。只会创建一个虚拟文件，用户可以将任何源坐标添加到~/.nsb/mypycat.txt
用作命令行工具
python -m nsb [--OPTIONS] [--FLAGS]
python -m --help
--h --help prints this help message
--create CONFIGFILE
writes a standard value configfile
OPTIONS:
(can all be set in config)
--use CONFIGFILE:
use a dedicated (non standard) configfile
--t1 --time DATETIME:
time and date for which the map should be drawn
format: 2010/12/24 23:59:59
--t2 --time_end DATETIME:
needed for plots over a timestamp like --trend and --maxnsb
format: 2010/12/24 23:59:59
--o --output /OUTPUT/DIRECTORY/
for saving results in different place than working directory
filenames will be generated automatically
--s --size IMAGESIZE:
set the output Imagesize in Pixels
--altaz ALT AZ:
set the observation position in the sky manually (unit: degrees)
--q --source SOURCENAME:
set the observation position automatically on a source by name
i.e.: "crab", "moon"
--l --location LOCATION:
The observers coordinates (Lon Lat) on earth and elevation (unit: degrees and meters)
format: 16.5028 -23.27280 1800.0
--hp LEVEL:
HealPix Level for the gaia catalog to be plotted
Integer in range [1:12]
--g --gauss KERNELSIZE:
Gaussian Kernel in pixel to smoothen the model images
format: 1.5
FLAGS:
(to steer programs the behaviour)
--verbose
Do verbose printouts
--mhz
use the new and still EXPERIMENTAL model to output MHz instead of nLb
--skymap
create the skymap and show it on screen
--savefits
save the Sky-Brightness Map as *.fits file
--maxnsb VALUE
creates a plot of nsb vs. gained observation time.
data points are additionally printed to console with --verbose.
(NEEDS a --time_end, typically more than a year to be not influenced by the Seasons)
format: 100.0
--trend
creates a time trend plot of nsb and source position over the given timespan
(NEEDS a --time_end)
Source, Sun and Moon Setting/Rising times are printed to console with --verbose
将其用作库
请参见以下示例：
创建allsky和视场地图，在屏幕上显示并将其保存为合适的
fromnsbimportconfigfromnsb.modelimportnsbModelfromnsb.mypycatimportmypycatfromnsb.gaiaimportGaiafromnsb.nsbtoolsimportmakeDateString,plotMapsimportephemimportmatplotlib.pyplotaspltimportastropy.io.fitsaspyfitscon=config.TheConfiguration()con.readStandardConfig()# or read a custom config# con.readConfig("my_config.cfg")#time_and_date = makeDateString("today now")time_and_date=ephem.Date("2019-01-26 21:29:07")mpc=mypycat()source=mpc.get("Crab Pulsar")gaiamap=Gaia(level=10)model=nsbModel(con,gaiamap,time_and_date,use_mhz=True)# draw what you wantmodel.drawAllSky(size=800)model.drawFOV_source(source=source,fov=5.0,size=1000)# model.drawFOV_altaz(alt=30, az=213, fov=5.0, size=42)# show the results on screenplotMaps(model.allskymap.data,'Allskymaps for %s'%(model.observer_source.date))plotMaps(model.fovmap.data,'FOV for %s'%(model.observer_source.date))plt.show()# save fits fileshdul=pyfits.HDUList([model.allskymap,model.fovmap])hdul.writeto("NSB_of_"+makeDateString(time_and_date)+"_.fits",'exception',True)
或者在一段时间内获取所有类型的值，如亮度、高度、方位角、相位等
fromnsbimportconfigfromnsb.modelimportnsbModelfromnsb.mypycatimportmypycatfromnsb.gaiaimportGaiafromnsb.nsbtoolsimportplotTimespanimportephemcon=config.TheConfiguration()con.readStandardConfig()time_and_date_1=ephem.Date("2019/05/10 12:00:00")time_and_date_2=time_and_date_1+1.0# plus one day (24h)mpc=mypycat()source=mpc.get("Eta Carinae")gaiamap=Gaia(level=7)model=nsbModel(con,gaiamap,time_and_date_1,time_and_date_2,threshold=400,timeresolution=15,verbose=False)model.setSource(source=source)model.calculateTimespan()# now these arrays are available and filledt=model.timestampsb=model.brightmp=model.moonphasemalt=model.moonaltsalt=model.sourcealtmaz=model.moonazsaz=model.sourceazsunalt=model.sunaltsunaz=model.sunazsep=model.separation# TODO: anything you like with these values# the plot from the --trend cmdline toolplotTimespan(model)
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