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# L1-IFS Data model
## 单次曝光处理_File：CSST_IFS_type_yyyymmddHHMMSS_yyyymmddHHMMSS_obsid_camera_L1_VER_process.fits
### File name description
type:  目标类型，4位字符串,对于科学数据为‘SCIE’\
yyyymmdd: 八位数观测日期，如20240101\
HHMMSS:  六位数UT观测时间，如122838\
两组时间为起始曝光时间和结束曝光时间\
obsid:  CSST统一的曝光编号，从相应0级数据继承\
camera:  光谱仪编号,1位字符串,红端为“R”,蓝端为“B”,红蓝拼接后的全谱为“A”\
L1:  表示文件为1级科学观测数据\
VER:  版本号，1位字符串和4位数字的组合,如R4203是DRP中RSS处理模块 v4.2.03 版本\
process:  8位字符串,代表8步基本数据处理流程，由字母表示,含义如下:
```
e：已抽谱
w：已进行波长定标
n：已对平场归一
r：已扣除宇宙线
f：已进行流量定标
c：已生成三维数据块
g: 已完成天体测量位置（IFS-WCS）定标
```
### File contents
| HDU | data | note |
|------|-------------------------|------------|
| HDU0 | None | PrimaryHDU |
| HDU1 | FLUX | ImageHDU |
| HDU2 | IVAR | ImageHDU |
| HDU3 | MASK | ImageHDU |
### HDU0
#### Header of `csst_ifs_rss`
| Level 1 extension header keywords (new) | | | |
|-----------------------------------------|---------------------------------------------------------------------|--------|----------------------------------------------------------------------------------------------------------|
| Keyword | Description | Format | Remark |
| Standard keywords | | | |
| XTENSION | IMAGE extension | C8 | 'IMAGE ' |
| BITPIX | Number of bits per data pixel | I4 | -32 |
| NAXIS | Number of data axes | I4 | 3 |
| NAXIS1 | Number of spatial bins in X axis | I4 | 32 |
| NAXIS2 | Number of spatial bins in Y axis | I4 | 32 |
| NAXIS3 | Number of wavelength bins | I4 | NWAVE |
| Image processing keywords | | | |
| PROCESS | RSS process record | C8 | ‘bewnrfcg’ |
| RSS_VER | version of RSS code | C5 | |
| FLUXUNIT | Flux unit | C20 | 1E-17 erg/s/cm2/Å/arcsec2 |
| HISTORY | Time of last image processing | C80 | |
| BIAS_MAS | The file name of the master bias. | C80 | |
| DARK_MAS | The file name of the master dark | C80 | |
| FLAT_MAS | The file name of the master flat | C80 | |
| LAMP_MAS | The file name of the master lamp | C80 | |
| TRACFILE | The reference file of trace | C80 | |
| PTOWFILE | The reference file of pixel-to-wavelength solution | C80 | |
| STDSTAR | The filename of the stardard star. | C80 | |
| HASCTE | Has CTE correction | C01 | T or F |
| HASSAT | Has satellite correction | C01 | T or F |
| HASSCA | Has stray light correction | C01 | T or F |
| QCFLUX | The counts of NAN+INF in flux | I4 | |
| QCIV | The counts of NAN+INF in IV | I4 | |
| | | | |
| IFS-WCS Calibration keywords | | | |
| WCSCAL_S | Determination of WCS calibration completion | I4 | The completion status is determined according to different situations, 0 means no operation is performed |
| WCSCAL_V | Version of WCS calibration | Cxx | |
| WCSCAL_P | Name of the configuration file used for WCS calibration | Cxx | |
| WCS_TLM | Time of last wcs calibration | Cxx | Time of the last WCS calibration |
| RADECSYS | Frame of reference of coordinates | C08 | 'ICRS' or 'FK5' |
| EQUINOX | | R4 | always 2000.0 |
| CD1_1 | Coordinate transformation matrix element | R8 | |
| CD1_2 | Coordinate transformation matrix element | R8 | |
| CD2_1 | Coordinate transformation matrix element | R8 | |
| CD2_2 | Coordinate transformation matrix element | R8 | |
| CTYPE1 | Right Ascension, gnomonic projection | C8 | 'RA---TAN' |
| CTYPE2 | Declination, gnomonic projection | C8 | 'DEC--TAN' |
| CUNIT1 | Units of coordinate increment and value | C4 | 'DEG' |
| CUNIT2 | Units of coordinate increment and value | C4 | 'DEG' |
| CRPIX1 | Pixel coordinate of reference point | R8 | |
| CRPIX2 | Pixel coordinate of reference point | R8 | |
| CRVAL1 | RA of reference point | R8 | deg |
| CRVAL2 | DEC of reference point | R8 | deg |
| CSYER1 | Systematic error in coordinate | R8 | deg |
| CSYER2 | Systematic error in coordinate | R8 | deg |
| CTYPE3 | The type of wavelength array | C8 | 'WAVE-LIN' or 'WAVE-LOG' |
| CUNIT3 | unit of wavelength array | C8 | Angstrom |
| CRPIX3 | Starting pixel | R8 | |
| CRVAL3 | The central wavelength wv0 of first pixel | R8 | Angstrom |
| CD3_3 | wavelength dispersion per pixel | R8 | Angstrom |
| GGUIFILE | Geometric data object file of the guider camera relative to the IFS | Cxx | |
| IGUIFILE | Image data object file for guider accompanying observations | Cxx | |
| GMCIFILE | Geometric data object file of the MCI relative to the IFS | Cxx | |
| IMCIFILE | Image data object file for MCI accompanying observations | Cxx |
## File: CSST_IFS_CUBE_{OBJ_id}_{VER_cube}_{LIN/LOG}_{STM_cube}.fits
## 多次曝光叠加_File: CSST_IFS_CUBE_{OBJ_id}_{VER_cube}_{LIN/LOG}_{STM_cube}.fits
### File contents
......
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