Поиск по:www.stsci.edu -
Поискать по всем серверам
На этой странице приведены все страницы сервера www.stsci.edu ,которые мы индексируем. Показаны документы 161 - 180 из 36095.
Упорядочить по:
URL
|
дате изменения
161. http://www.stsci.edu/documents/dhb/web/c05_focdata.fm.html
... When newly-gathered HST data arrive at STScI, a system known as OPUS 1 immediately partitions the data into separate files, looks for discrepancies between the planned and executed observations, calibrates the data files, and deposits them in the HST Archive. The FOC data files you obtain from the Archive via the Internet or on a data tape will be in FITS format. ... Chapter 2 describes the GEIS and FITS file formats, and shows how to convert archival FITS files into GEIS files. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c05_focdata.fm.html -- 3.5 Кб -- 17.11.1997
Похожие документы
Похожие документы
162. http://www.stsci.edu/documents/dhb/web/c05_focdata.fm1.html
... The name of each file in an FOC dataset, such as x3l80101t.d0h, has a three-character suffix, in this case the d0h , that uniquely identifies the file's content. ... c1h /. c1d files. ... c1h /. c1d files contain the final calibrated data, which are likely to be of greatest interest to observers. ... trl or trailer file-which comes with each FOC observation-is an ASCII text file that describes the standard processing applied to the images by OPUS. ... Raw Data Files .d0h/.d0d . ... Trailer file .pdq...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c05_focdata.fm1.html -- 5.0 Кб -- 17.11.1997
Похожие документы
Похожие документы
163. http://www.stsci.edu/documents/dhb/web/c05_focdata.fm2.html
... FOC image headers contain numerous keywords specifying how an observation was taken and how the resulting data were calibrated. ... For easy reference, Table 5.2 lists these header keywords, their definitions, and the possible keyword values for the commonly used FOC observing modes. ... page These additional keywords provide information on such things as the photometric transformation of the image, any interruptions of the exposure, and the guidance mode used during the observation. ... Shutter...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c05_focdata.fm2.html -- 14.6 Кб -- 19.10.2004
Похожие документы
Похожие документы
164. http://www.stsci.edu/documents/dhb/web/c05_focdata.fm3.html
... The first step in understanding how your data files relate to your original request is to examine the header keywords using iminfo or imheader . For example, the iminfo listing in Figure 5.1 says that exposure x2x10108t was a 722.4 second exposure of target BPM16274 using filters F253M+F4ND with the 256 x 256 format of the f /96 camera. It also gives the Exposure ID as 01-023, meaning the exposure listed under Visit 1, Exposure Logsheet line 23 of the Phase II proposal. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c05_focdata.fm3.html -- 7.1 Кб -- 17.11.1997
Похожие документы
Похожие документы
165. http://www.stsci.edu/documents/dhb/web/c05_focdata.fm4.html
Top] [Prev] [Next] [Bottom] . All HST observers currently receive a set of Paper Products shortly after a given observation executes. These documents provide a quick first look at the data, summarize the image statistics, and point out potential problems with the data, drawing on information in the PDQ file. All observers, including Archive users, can run the pp_dads task in STSDAS to obtain a set of paper products for any FOC dataset. ... See Figure 5.4 through Figure 5.8 for examples.) ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c05_focdata.fm4.html -- 3.7 Кб -- 17.11.1997
Похожие документы
Похожие документы
166. http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm.html
Top] [Prev] [Next] [Bottom] . FOC Pipeline Processing / 6-1 . FOC Calibration Switches / 6-2 . Reasons to Recalibrate / 6-8 . How to Recalibrate / 6-10 . This chapter describes the FOC calibration pipeline, discusses possible reasons for recalibrating your data, and shows you how to rerun the calibration tasks. ... stevens@stsci.edu Copyright ї 1997, Association of Universities for Research in Astronomy. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm.html -- 2.7 Кб -- 17.11.1997
Похожие документы
Похожие документы
167. http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm1.html
... All data received by STScI from the Space Telescope Data Capture Facility pass through the Observation Support and Post-Observation Processing Unified System (OPUS)-referred to as the pipeline -to be processed and calibrated. ... The calibration files and tables are taken from the Calibration Data Base (CDBS) at STScI and are usually the most up-to-date calibration files appropriate for the instrumental configuration used in the observation. ... d0h file, and it produces two output images: . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm1.html -- 4.1 Кб -- 17.11.1997
Похожие документы
Похожие документы
168. http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm2.html
... Corrects the geometric distortion of the image via interpolation of the data onto a rectified grid, creating a . c0h file. ... c1h file. ... To determine the calibration steps applied to the data and the calibration reference files used to calibrate the data, look at the values of the calibration switches in the header of the raw (or calibrated) data. ... Perform geometric correction to rectify optical and detector distortion using geometric correction reference file. geohfile . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm2.html -- 18.7 Кб -- 17.11.1997
Похожие документы
Похожие документы
169. http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm3.html
... FOC data files retrieved from the Archiv e were calibrated with the best calibration reference files available at the time the data were taken. ... New sensitivity information for the OTA+COSTAR+FOC system (e.g., new format-dependent sensitivity ratios, re-calibration of the FOC DQE curve). ... New geometric correction reference files. ... Delivery of new geometric correction files often lures users into thinking that they need to recalibrate their data using the most up-to-date reference files. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm3.html -- 9.7 Кб -- 17.11.1997
Похожие документы
Похожие документы
170. http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm4.html
... Once you have determined that recalibration is necessary, you can either rerun calfoc using the correct reference files or rerun the individual STSDAS tasks that perform the desired operations. Before recalibrating, make sure you obtain the desired reference files. The easiest way to obtain calibration reference files is via StarView, as described on page 1- 19 . To recalibrate using calfoc , first assemble your set of calibration reference files. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c06_foccalib.fm4.html -- 4.0 Кб -- 17.11.1997
Похожие документы
Похожие документы
171. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm.html
Top] [Prev] [Next] [Bottom] . ... Geometric Correction / 7-4 . ... Errors in Absolute Photometry (f/96) / 7-14 . ... The pipeline processing described in the previous chapter attempts to remove most of the instrumental signatures of the FOC detector. Pipeline processing does not remove all of the instrumental features because some of the FOC's properties are either time dependent, varying in a random way that precludes correction, or else difficult to correct without introducing other errors. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm.html -- 3.4 Кб -- 17.11.1997
Похожие документы
Похожие документы
172. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm1.html
Top] [Prev] [Next] [Bottom] . Table 7.1 lists certain effects owing to the design of the FOC detector, optics, and electronics that afflict all FOC images and indicates whether the pipeline corrects for them. Characteristics Corrected in Standard Pipeline . ... The diagram below (Figure 7.1 ) describes where these various instrumental characteristics arise. ... The following sections describe the limitations of these calibrations and their effects on the uncorrected image characteristics. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm1.html -- 4.0 Кб -- 17.11.1997
Похожие документы
Похожие документы
173. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm2.html
... At high count rates, the video processing unit (VPU) of the FOC undercounts photon events, resulting in a nonlinear count rate. ... The FOC remains linear to much higher count rates for point sources than for uniform sources. ... Here, a uniform source is defined to be one in which the flux varies by less than +/- 10% on scales of 10 pixels, and the nonlinearity threshold is defined to be the count rate at which the FOC exhibits nonlinearity at the 10% level. ... 512 zoom x 1024 . ... 256 x 256 . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm2.html -- 9.1 Кб -- 17.11.1997
Похожие документы
Похожие документы
174. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm3.html
Top] [Prev] [Next] [Bottom] . The current geometric correction algorithm is good at correcting the gross characteristics of the FOC's geometric distortion, rectifying it to 0.5 pixels rms over most of the imaging format. However, the plate scales and orientations of FOC images are known to be time-dependent. ... This effect, a product of the geometric correction procedure caused by the algorithms used in re-binning the data, is merely a modulation of the noise characteristics of the data. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm3.html -- 3.5 Кб -- 17.11.1997
Похожие документы
Похожие документы
175. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm4.html
... There are currently four UNI (flatfield) files for the f /96 camera at 1360, 4800, 5600, and 6600 and two UNI files for the f /48 camera at 3345 and 4800 . ... In flatfields with count rates between about 0.02 and 0.1 counts pixel -1 s -1 for a 512 x 512 format, the rms amplitude of the pattern is about 5% of the flatfield counts for f /96 and about 2.5% for f /48 (the peak deviations from a flat response due to this pattern are at least twice these values). ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm4.html -- 12.5 Кб -- 17.11.1997
Похожие документы
Похожие документы
176. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm5.html
... The sensitivity of the FOC depends on the format being used. The overall (OTA + COSTAR + FOC) central absolute quantum efficiency Q( ) in counts photon-1 (DQE), plotted in Figure 4.3 and tabulated as a function of wavelength in Table 11 of the FOC Instrument Handboo k (version 7.0), refers to the 512 x 512 format. ... Format-Dependent Sensitivity Ratios . ... 512 z x 1024 . ... 512z x 512 . ... 512 x 512 . ... 512 z x1024 . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm5.html -- 4.9 Кб -- 17.11.1997
Похожие документы
Похожие документы
177. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm6.html
... The FOC suffers from various types of background, the most important of which are thermal electrons, Cerenkov radiation from high energy particles, geocoronal emission lines, zodiacal light, and light scattered within HST from the bright Earth or Moon. ... From on-orbit measurements using the f /96 camera, the former background has been found to vary with solar zenith distance (ZD); see Sections 6.4, 6.5, and 7.0 of the FOC Instrument Handbook , version 7.0, for more details. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm6.html -- 7.5 Кб -- 17.11.1997
Похожие документы
Похожие документы
178. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm7.html
... The FOC filter wheels hold the filters roughly parallel with the photocathode of the FOC, but slight offsets can shift the image position. The offset of the F320W filter, an image shift of 80 pixels, means a centered target is thrown about 80 pixels towards the edge of the image when the F320W filter is put in place. Most FOC filters in the visible band induce an image shift of over 7 pixels, or over 0.1", in an f /96 image. ... Filter Induced Image Shifts Relative to F120M Image . ... F120M . ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm7.html -- 6.6 Кб -- 17.11.1997
Похожие документы
Похожие документы
179. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm8.html
... The absolute photometric accuracy of FOC observations depends on several factors. ... The remaining errors most likely arise from: 1) errors in the published fluxes or variations in fluxes of the spectrophotometric stars used to calibrate the absolute DQE, 2) errors in the assumed PSFs, 3) errors in the assumed filter transmission curves, 4) format dependence effects, 5) temporal variability in the FOC detectors, and 6) the spectrum of the source. ... Errors in the assumed filter transmission curves...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm8.html -- 6.5 Кб -- 17.11.1997
Похожие документы
Похожие документы
180. http://www.stsci.edu/documents/dhb/web/c07_focerror.fm9.html
Top] [Prev] [Next] [Bottom] . ... A calibration program was developed and run in December 1993, after COSTAR was installed but before it was deployed. The results of this program are presented in FOC IS R 077. This study indicated that the sensitivity from about 1800 to 3000 appears to be about 60% of the prelaunch estimate of sensitivity, with some uncertainty because the data used to derive this factor were less than ideal. In general, f /48 fluxes must be considered quite uncertain. ...
[
Сохраненная копия
]
Ссылки http://www.stsci.edu/documents/dhb/web/c07_focerror.fm9.html -- 2.8 Кб -- 17.11.1997
Похожие документы
Похожие документы