<_Note>Nodes prefixed with a _ are not valid SPASE, but are included for debugging. Values prefixed with a x_ are not valid SPASE but may considered for addition for completeness. 2.6.1 <_MasterURL>https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/po_ej_vis_00000000_v01.json (from all.xml) <_ResourceID>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json Polar Visible Imaging System, Earth Camera Images, processed <_ResourceName>Source: Master/CDFglobalAttributes/Logical_source_description PO_EJ_VIS <_AlternateName>Source: Master/CDFglobalAttributes/Logical_source Instrument functional description: The VIS is a set of three low-light-level cameras. Two of these cameras share primary and some secondary optics and are designed to provide images of the nighttime auroral oval at visible wavelengths. A third camera is used to monitor the directions of the fields-of-view of the auroral cameras with respect to the sunlit Earth and return global images of the auroral oval at ultraviolet wavelengths. The VIS instrumentation produces an auroral image of 256 x 256 pixels approximately every 24 seconds dependent on the integration time and filter selected. The fields-of-view of the two nighttime auroral cameras are 5.6 x 6.3 degrees and 2.8 x 3.3 degrees for the low and medium resolution cameras, respectively. One or more Earth camera images of 256 x 256 pixels are produced every five minutes, depending on the commanded mode. The field-of-view of the Earth camera is approximately 20 x 20 degrees. Reference: Frank, L. A., J. B. Sigwarth, J. D. Craven, J. P. Cravens, J. S. Dolan, M. R. Dvorsky, J. D. Harvey, P. K. Hardebeck, and D. Muller, 'The Visible Imaging System (VIS) for the Polar Spacecraft', Space Science Review, vol. 71, pp. 297-328, 1995. [Note to first-time users: The first four variables are of primaryinterest. The displayable 256 x 256 image array is in variable 3. Thecorrect orien- tation of a displayed image is explained in thedescription of variable 3 below.] Data set description: The VIS Earth camera data set comprises all Earth camera images forthe selected time period. EJ-ER type files have images that have beenprocessed to remove the effects of penetrating radiation. In addition,the images have been flat-fielded and fixed pattern noise has beenremoved. Image pixels are median filtered with the images immediatelybefore and after in time. The displayable image counts are in variable3. Some coordinate information is included for viewer orientation.Coordinates are calculated for a grid of 18 x 18 points corresponding toone pixel out of every 15 x 15 pixel block. In addition, a rotationmatrix and a table of distortion-correcting look direction unit vectorsare provided for the purpose of calculating coordinates for every pixel.See the description of variables 14 and 15 below. To facilitate viewingof the images, a mapping of pixel value to a recommended color tablebased on the characteristics of the selected filter will be included witheach image. See the description of variables 19, 20, and 21 below. Arelative intensity scale is provided by the uncompressed count table ofvariable 24. Approximate intensity levels in kiloRayleighs are given inthe intensity table of variable 25. Information on the availability ofmore precisely calibrated intensities can be found on the VIS website atURL http://eiger.physics.uiowa.edu/~vis/software/. Variable descriptions: 1,2. Center time The time assigned to an image is the center time of the integration period within a resolution of 50 milliseconds. 3. Image counts Image pixel counts range from 0 to 255. They are stored in a two- dimensional 256 x 256 byte array. Images from the Earth camera (sensor 0) are conventionally displayed with row 1 at the top, row 256 at the bottom, column 1 on the left, and column 256 on the right. The conventional image display for the low resolution camera (sensor 1) is rotated 180 degrees so that the row 1-column 1 pixel is at the lower right corner and the row 256-column 256 pixel is at the upper left corner. When displayed in this manner, the spacecraft spin axis is oriented to the right in the display, the X component is defined as the center of the image look direction, and the Y component is the 4. Sensor number 0 = Earth camera, 1 = low resolution camera, 2 = medium resolution camera. 5. Half integration time This is half the length of the integration period for the image, measured in milliseconds. 6. Filter Twelve filters are available for visible imaging; the filter number, 1-12, is given here. Ultra-violet imaging is done with one filter only, designated here as filter number 0. In addition, the peak wavelength in Angstroms is given for the selected filter. 7. Presumed altitude of emissions The presumed altitude of the emissions seen in the image varies with the characteristics of the filter used. 8. Platform pitch angle This is the platform pointing angle of rotation around the spin axis, measured from nadir. 9,10. Geographic coordinates Geographic north latitude and east longitude are provided for the pixels at these image array locations: every 15th row starting with row 1 and ending with row 256, and every 15th column starting with column 1 and ending with column 256, for a total of 18 x 18 coordinate pairs. 11,12. Spacecraft position and velocity vectors, GCI The spacecraft position vector and velocity vector in GCI coordinates are for the image center time as given in variables 1 and 2. 13. Spacecraft spin axis unit vector, GCI 14,15. Image-to-GCI rotation matrix and look direction vector table The rotation matrix may be used with the look direction vector table to obtain pointing vectors in GCI coordinates for each pixel. The resulting vectors may be used to calculate coordinates for the observed positions of the pixels. Software for this purpose is available at URL http://eiger.physics.uiowa.edu/~vis/software/. The general method used is described below. In the image coordinate system, the X axis is the center line-of-sight or look direction; the Y axis is the cross product of the spin axis an the X axis; and the Z axis is the cross product of the X axis and the Y axis. When the display orientation conventions in the variable 3 description are applied, the low resolution camera image is rotated so that both Earth camera and low resolution camera images are displayed with Y axis pointing up and Z axis pointing toward the right. To obtain the coordinates of the observed position of a pixel, calculate the intersection of the line-of-sight with the surface of an oblately spheroidal Earth at the altitude given as variable 7. The equation of the spheroid is X**2/(A+ALT)**2 + Y**2/(A+ALT)**2 + Z**2/(B+ALT)**2 = 1 where A is the Earth radius at the equator, B is the Earth radius at the pole, and ALT is the given altitude. The line-of-sight equations are (X-SCX)/DX = (Y-SCY)/DY = (Z-SCZ)/DZ where (SCX,SCY,SCZ) is the spacecraft position vector GCI, and (DX,DY,DZ) is the look direction unit vector GCI. Solve the line-of-sight equations for two variables in terms of the third; substitute into the spheroid equation; and use the quadratic formula to solve for the third variable. Select the solution point closer to the spacecraft. 16. Zenith angle of center line-of-sight at presumed altitude This is the angle between the geocentric vector through the observed point, assuming the altitude given as variable 7, and the reverse of the image center line-of-sight vector. 17. Sun position unit vector, GCI 18. Solar zenith angle at observed point of center line-of-sight This is the angle of the sun from zenith at the observed point of the center line-of-sight, assuming the altitude given as variable 7. 19. RGB color table This is the recommended color table to be used with the limits given in variables 20 and 21. 20,21. Low and high color mapping limits The low and high color limits are recommended for remapping the color table entries, as follows: For pixel values less than the low limit, use the color at table position 1. assignments: and less than or equal to the high limit, use the color at table position (pix-low)/(high-low) x 255 + 1. For pixel values greater than the high limit, use the color at table position 256. 22. Data quality flag The data quality word has bits set to 1 when the listed conditions are true. Bit #31 is the most significant bit in the word, and it will not be used as a flag. These are the bit bit 0 - image data frame sync error bit 1 - image data frame counters error bit 2 - image data fill frame flag. 23. Post gap flag The post gap flag has these possible values: 0 - no gap occurred immediately prior to this record, 1 - the gap occurred because the instrument was not in a mode that allowed for the production of images for the selected sensor, 2 - the gap occurred because level zero data were missing, 3 - the gap occurred because level zero data were too noisy to extract images. 24. Expanded count table The image pixel counts are quasi-logarithmically compressed to the range 0-255. This table gives the average of the uncompressed range for each compressed count value. Table entries 1-256 correspond to compressed counts 0-255 respectively. 25. Intensity table Approximate intensity levels in kiloRayleighs are given for each compressed count value. Table entries 1-256 correspond to compressed counts 0-255 respectively. Information on the availability of more precisely calibrated intensities can be found on the VIS website at URL http://eiger.physics.uiowa.edu/~vis/software/. Supporting software: Supporting software is available on the VIS website at the URL http://eiger.physics.uiowa.edu/~vis/software/. Included is an IDL program that displays the images with the recommended color bar and provides approximate intensities and coordinate data for each pixel. <_Description>Source: Master/CDFglobalAttributes/TEXT <_Rights> SPDX Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html https://spdx.org/licenses/ http://space.physics.uiowa.edu/vis/ VIS Summary PNG Collection (combined Visible and Earth Camera images at U. Iowa Polar <_Note>URL also in all.xml. Using master. ISTP Polar VIS Earth camera images <_DOI>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json <_AccessInformation>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json 1996-05-26T00:00:48Z 2000-07-16T23:59:06Z <_TemporalDescription>Generated from all.xml/@timerange_start and all.xml/@timerange_stop PT53.55S <_Cadence>Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/polar/vis/vis_ej/1996/po_ej_vis_19960526_v02.cdf. The most common cadence, 53550 [ms] = PT53.55S, occurred for 26.3309% of the 366 timesteps. <_ObservedRegion>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ObservedRegion.json <_ProcessingLevel>Processing level is not available in the master file; it should be there instead of, say, https://github.com/rweigel/cdawmeta-spase/blob/main/ProcessingLevel.json spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa HTTPS from SPDF https://cdaweb.gsfc.nasa.gov/pub/data/polar/vis/vis_ej In CDF via HTTP from CDAWeb po_ej_vis_%Y%m%d_%Q.cdf %Y PO_EJ_VIS CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa FTPS from SPDF ftps://cdaweb.gsfc.nasa.gov/pub/data/polar/vis/vis_ej In CDF via HTTP from CDAWeb po_ej_vis_%Y%m%d_%Q.cdf %Y PO_EJ_VIS CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa CDAWeb Web Service https://cdaweb.gsfc.nasa.gov/WebServices/ Instructions for using web services to access this dataset an other other metadata and options for CDAWeb datasets. The ProductKey here corresponds to the query parameter 'dataset' in the tables at the AccessURL in a dataset-related request can be made. PO_EJ_VIS CDF CSV GIF NetCDF PNG PS PDF XML x_Script.IDL x_Script.Python Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa CDAWeb Web Service user interface https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=PO_EJ_VIS PO_EJ_VIS Web service user interface for this product. CDF GIF PDF Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa CDAWeb Python Script https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/PO_EJ_VIS/clientLibraryExample/ PO_EJ_VIS Web service that generates a Python script to access this product. x_Script.IDL x_Script.Python spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/SSCWeb. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa 4D Orbit Viewer https://sscweb.gsfc.nasa.gov/4dorbit/?sc=PO_EJ_VIS PO_EJ_VIS Web Service to this product. HTML spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa CDAWeb HAPI Server https://hapi-server.org/servers/#server=CDAWeb&dataset=PO_EJ_VIS PO_EJ_VIS Web Service to this product using the HAPI interface. CSV JSON Binary spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa CDAWeb HAPI Script in Multiple Languages https://hapi-server.org/servers/#server=CDAWeb&dataset=PO_EJ_VIS&return=script PO_EJ_VIS Web Service user interface that generates scripts in IDL, Javascript, MATLAB, Python, Autoplot, curl, wget to access this product. See https://hapi-server.org/servers/api for the API. x_Script.IDL x_Script.Javascript x_Script.MATLAB x_Script.Python x_Script.Autoplot x_Script.curl x_Script.wget spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Louis A. Frank at The University of Iowa HAPI visualizations https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=PO_EJ_VIS&format=gallery PO_EJ_VIS Web Service that generates plots. See https://hapi-server.org/plot/ for the API. PNG PDF SVG Polar Plasma Laboratory (from all.xml/observatory/description/@short) Visible Imaging System (from all.xml/instrument/description/@short) Space Physics (from Master/CDFglobalAttributes/Discipline) Magnetospheric Science (from Master/CDFglobalAttributes/Discipline) POLAR (from Master/CDFglobalAttributes/Source_name) Polar Plasma Laboratory (from Master/CDFglobalAttributes/Source_name) EJ (from Master/CDFglobalAttributes/Data_type) Earth Camera Images, processed (from Master/CDFglobalAttributes/Data_type) VIS (from all.xml/instrument/@ID) Earth.NearSurface.Ionosphere Earth.Magnetosphere Earth.NearSurface.AuroralRegion Earth.NearSurface.EquatorialRegion Earth.NearSurface.Plasmasphere Earth.Magnetosphere.Polar Heliosphere.Inner Earth.NearSurface.PolarCap Earth.Magnetosphere.RadiationBelt Earth.NearSurface CENTER TIME (Epoch) Epoch CATDESC: 'Image center time, Epoch'. Notes not in Master CDF: 'The units are the units in CDF files. For other web services, this variable is may be represented as a time string.' ms Scalar Temporal CENTER TIME Time_PB5 Master CDF CATDESC: 'Image center time, PB5'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' -2147483648 3 year day msec Presumed Altitude of Emissions AltF Master CDF CATDESC: 'Presumed emission altitude (also quickly shows times when images are available). '. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Kilometers -1e+31 Image Pixel Counts Image_Counts Master CDF CATDESC: 'Earth Camera UV Images (quasi-log cnts), small format display with click-expand (~1 min. res.)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts (large format) Image_CountsF Master CDF CATDESC: ' --> Larger format display with click-expand, no geographic registration.'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts Overlay Mapped_ImageO Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) With geographic map overlay'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts Overlay Mapped_Image Master CDF CATDESC: ' --> [DO NOT USE: UNDER-DEVELOPMENT] Test Display'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts Mapped_ImageP Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to geographic (fixed sun orientation)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts MLT VV Mapped_ImageM Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to magnetic LT and invariant lat'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts (movie) Movie_Image Master CDF CATDESC: '(USE SHORT TIME SPANS) Movie display of images, no geographic registration.'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts Overlay (movie) Mapped_MovieO Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) With geographic grid overlay'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts (movie) Mapped_MovieP Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to geographic (fixed sun orientation)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts MLT VV (movie) Mapped_MovieM Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to magnetic LT and invariant lat'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts in KiloRayleighs IImage_Counts Master CDF CATDESC: 'Earth Camera UV Images (kRay), small format display with click-expand (~1 min. res.)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts (large format) IImage_CountsF Master CDF CATDESC: ' --> Larger format display with click-expand, no geographic registration.'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts 255 256 256 Image Pixel Counts in KiloRayleighs Mapped_IImageO Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) With geographic grid overlay'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs Mapped_IImageP Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to geographic (fixed sun orientation)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs MLT Mapped_IImageM Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to magnetic LT and invariant lat'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs Movie_IImage Master CDF CATDESC: '(USE SHORT TIME SPANS) Movie display of images, no geographic registration.'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs Mapped_IMovieO Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) With geographic grid overlay'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs Mapped_IMovieP Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to geographic (fixed sun orientation)'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Image Pixel Counts in KiloRayleighs MLT Mapped_IMovieM Master CDF CATDESC: ' --> (USE SHORT TIME SPANS) Azimuthal projection to magnetic LT and invariant lat'. Master CDF VAR_NOTES: 'Image_Counts contains the displayable image. The counts have been quasi-logarithmically compressed by the instrument. Approximate uncompressed value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1). Approximate intensity in kR is Intens_Table(Image_Counts(i,j)+1).The appearance of the actual count value 255 is rare. When displaying an image,it works best to use the fill value as an overflow (i.e. brightest) value.'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' KiloRayleighs 255 256 256 Geo_lat Geo_Lat Master CDF CATDESC: 'Geographic latitude grid - virtual var.'. Master CDF VAR_NOTES: 'Geographic N. latitude for pixels vals - computed by CDAWeb '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 256 256 Geo_lon E. Longitude Geo_Lon Master CDF CATDESC: 'Geographic longitude grid - virtual var.'. Master CDF VAR_NOTES: 'Geographic E. longitude for pixels vals - computed by CDAWeb '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 256 256 INTEGRATION TIME (HALF) Int_Time_Half Master CDF CATDESC: 'Half of the integration period measured in milliseconds'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Msec -1e+31 Filter number and wavelength Filter Master CDF CATDESC: 'Filter number and peak wavelength in Angstroms)'. Master CDF VAR_NOTES: 'Filters #1-12 are visible wavelengths; filter #0 is UV for Earth camera images'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' -2147483648 2 number Angstroms Platform Pitch Angle PPitch Master CDF CATDESC: 'Platform pointing angle from nadir'. Master CDF VAR_NOTES: 'Platform angle of rotation around spin axis, measured from nadir in tenths of degrees'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees*10 -2147483648 Pixel15 N. Latitude Pix15Lat Master CDF CATDESC: 'Geographic latitude grid'. Master CDF VAR_NOTES: 'Geographic N. latitude for pixels at every 15th row and column from 1 to 256'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 18 18 Pixel15 E. Longitude Pix15Lng Master CDF CATDESC: 'Geographic longitude grid'. Master CDF VAR_NOTES: 'Geographic E. longitude for pixels at every 15th row and column from 1 to 256'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 18 18 Spacecraft position GCI SC_Pos_GCI Master CDF CATDESC: 'GCI position vector of Polar spacecraft in kilometers.'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Kilometers -1e+31 3 Spacecraft velocity GCI SC_Vel_GCI Master CDF CATDESC: 'GCI velocity vector of Polar spacecraft in km/sec.'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Kilometers/second -1e+31 3 Spacecraft spin axis GCI SC_SpinV_GCI Master CDF CATDESC: 'GCI spin axis unit vector of Polar spacecraft.'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' 1 -1e+31 3 Rotation matrix Rotatn_Matrix Master CDF CATDESC: 'Image-to-GCI rotation matrix'. Master CDF VAR_NOTES: 'X component is look direction,Y component is the spin axis cross X'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' 1 -1e+31 3 3 Zenith Angle of Center Line V_Zenith Master CDF CATDESC: 'Zenith angle of center line-of-sight at intersection with Earth'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 Sun Vector GCI Sun_Vctr Master CDF CATDESC: 'GCI unit vector toward sun'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' 1 -1e+31 3 Solar Zenith at Center S_Zenith Master CDF CATDESC: 'Solar zenith angle at intersection of center line-of-sight with Earth'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Degrees -1e+31 Color Limit Low Limit_Lo Master CDF CATDESC: 'Lower limit for remapping color table to pixel range (see TEXT)'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts -32768 Color Limit High Limit_Hi Master CDF CATDESC: 'Upper limit for remapping color table to pixel range (see TEXT)'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' Counts -32768 Data Quality Flag D_Qual Master CDF CATDESC: 'Data quality flags'. Master CDF VAR_NOTES: 'MSB will not be used as a flag; see TEXT for other bit assignments'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' none -2147483648 Post Gap Flag Post_Gap Master CDF CATDESC: 'project standard value assignments'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' none -2147483648 Image headers Headers Master CDF CATDESC: 'Image header bytes'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' none 255 64 16