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At line 3 changed one line
1. search [EIS study database|../../SolarB/EisStudyList.jsp] to find out which study has adotped a specific compression scheme such as DPCM, JPEG95, etc. For example, study 29, 30, 31, 32, 91, 92, 142, 255, 258 have ever used JPEG90 compression scheme.
1. search [EIS study database|../../SolarB/EisStudyList.jsp] to find out which study has adopted a specific compression scheme such as DPCM, JPEG95, etc. For example, study 29, 30, 31, 32, 91, 92, 142, 255, 258 have ever used JPEG90 compression scheme.
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* study 29-32 are designed specially for all of compression schemes test, however, only study 29, 30 have generated useful fits files. Also the selection of compression scheme was done in eis_mk_study tool, rather than eis_mk_raster, thus there was no scheme inofrmation in these fits header. In this case one needs to manually find out the scheme for every fits files by study 29, 30.
* study 29-32 are designed specially for all of compression schemes test, however, only study 29, 30 have generated useful fits files. Also the selection of compression scheme was done in eis_mk_study tool, rather than eis_mk_raster, thus there was no scheme information in these fits header. In this case one needs to manually find out the scheme for every fits files by study 29, 30.
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* Some studies use multiple rasters (eg. study 142), for conevenince of MDP data packets calculation the investigation only focuses on single-raster studies.\\
* Some studies use multiple rasters (eg. study 142), for convenience of MDP data packets calculation the investigation only focuses on single-raster studies.\\
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2. Once knowing details (eg. ID) of rasters, which using a specific compression scheme, one can extract oringinal data volume for these rasters (through EIS planning database), and the corresponding fits files (through EIS science database), then work out the data set for the investigation. The file [datasets_list.txt|../images/dcgifs/datasets_list.txt] lists the datesets used in this case.
2. Once knowing details (eg. ID) of rasters, which using a specific compression scheme, one can extract original data volume for these rasters (through EIS planning database), and the corresponding fits files (through EIS science database), then work out the data set for the investigation. The file [datasets_list.txt|../images/dcgifs/datasets_list.txt] lists the datasets used in this case.
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* In the 'plot' figures shown below, data points towards right imply themself coming from more recently observations.
* In the 'plot' figures shown below, data points towards right-side of X-axis imply themselves coming from more recently observations.
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The way to calculate EIS onboard compressed data volume with MDP status curves was descirbed in previous post abut EIS DC factor: [check it here|CompressionFactorStudy].
The way to calculate EIS on-board compressed data volume with MDP status curves was described in previous post abut EIS DC factor: [check it here|CompressionFactorStudy].
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The following links show DC factor variation in different scenarioes (eg. AR, QS for SCI_OBJ, 1", 2", 40", and 266" for SLA).
The following links show DC factor variation in different scenarios (eg. AR, QS for SCI_OBJ, 1", 2", 40", and 266" for SLA).
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A conservative estimation of avgerage factor is indicated by orange dash-line on the plot, which could be used to improve EIS planning tools when the number will be approved/corss-checked.
A conservative estimation of average factor is indicated by orange dash-line on the plot, which could be used to improve EIS planning tools.
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EIS Data Compression (DC) factors listed here are only for __Science Target__ & __Slit/Slot__ selection. For factor varation upon __exposure time__, please refer H. Hara's [results |../images/dcgifs/Compress_20080428_Hara.PNG], ([PDF|../images/dcgifs/Compress_20080428_Hara.pdf])
EIS Data Compression (DC) factors listed here are only for __Science Target__ & __Slit/Slot__ selection. For factor variation upon __exposure time__, please refer H. Hara's [results |../images/dcgifs/Compress_20080428_Hara.PNG], ([PDF|../images/dcgifs/Compress_20080428_Hara.pdf])
This page (revision-34) was last changed on 07-Dec-2016 14:14 by JianSunTop