Polar Visible Imaging System (VIS) Low Resolution Camera Images, Calibrated, Level 0 (L0), 12 s Data

https://doi.org/10.48322/1mkd-p917

2023-07-30 12:34:56.789

Instrument Functional Description: The VIS Instrument 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 × 256 Pixels approximately every 24 s dependent on the Integration Time and Filter selected. The Fields-of-View of the two Nighttime Auroral Cameras are 5.6 × 6.3° and 2.8 × 3.3° for the Low and Medium Resolution Cameras, respectively. The Medium Resolution Camera was never activated. One or more Earth Camera Images of 256 × 256 Pixels are produced every 5 min, depending on the commanded Mode. The Field-of-View of the Earth Camera is approximately 20 × 20°. See: http://vis.physics.uiowa.edu/vis/vis_description/vis_description.htmlx 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. Data Set Description: The VIS Earth Camera Data Set comprises all Earth Camera Images for the selected Time Period. Full Coordinate Information is included for Viewer Orientation. In addition, a Rotation Matrix and a Table of Distortion-correcting Look Direction Unit Vectors are provided for the Purpose of calculating Coordinates for every Pixel. To facilitate viewing of the Images, a Mapping of Pixel Value to a recommended Color Table based on the Characteristics of the selected Filter will be included with each Image. A Relative Intensity Scale is provided through an Uncompressed Count Table. Approximate Intensity Levels in kiloRayleighs are given in an Intensity Table. For detailed Information on Intensities, see Sensitivities_and_Intensities.txt at https://cdaweb.gsfc.nasa.gov/Polar_VIS_docs/SENSITIVITIES_AND_INTENSITIES.TXT. Supporting Software is available at: http://vis.physics.uiowa.edu/vis/software/ Included is an IDL Program that displays the Images with the recommended Color Bar, provides approximate Intensities, Coordinate Data for each Pixel, and includes multiple Options for Image Manipulation.

L.A. Frank

spase://VSPO/NumericalData/POLAR/VIS/VisibleImagerCalibrated/PT24S

Online

Open

CDF

None

L.A. Frank. Please acknowledge the Data Providers and CDAWeb when using these Data.

Online

Open

CSV

L.A. Frank. Please acknowledge the Data Providers and CDAWeb when using these Data.

PT24S

Epoch, Image Center Time

Epoch

Epoch Time, Image Center Time, The Time assigned to an Image is the Center Time of the Integration Period within a Resolution of 50 ms

This parameter exhibits an increasing monotonic progression.

PT24S

ms

1.0e-3>s

01-Jan-1992 00:00:00.000

31-Dec-2020 23:59:59.999

-1.0e+31

Image Center Time

Time series defined by using: EPOCH

Time_PB5

Time PB5, Image Center Time

PT24S

-2147483648

Raw Ultraviolet Images in QLC Counts, Image

Time series defined by using: EPOCH

Image_Counts_Raw

Uncleaned 256 × 256 Ultraviolet Image in Quasi-Logarithmically Compressed, QLC, Counts. Image Pixel Counts Range from 0 to 255. They are stored in a Two-Dimensional 256 × 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° 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 Cross Product of the Spin Axis and the Look Direction.

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_Tables(Image_Counts(i,j)+1,Filter(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.

PT24S

255

Cleaned Ultraviolet Images in QLC Counts, Image

Time series defined by using: EPOCH

Image_Counts_Clean

Cleaned and Filtered 256 × 256 Ultraviolet Image in Quasi-Logarithmically Compressed, QLC, Counts. These are Image Pixel Counts that have been calibrated using the following Routines. For the Earth Camera: Horizontal Smooth EC 4 if the Modified Julian Date (MJD) is greater than 3429 (Correction required after an Event in 2005), Horizontal Smooth EC 6 if the Modified Julian Date (MJD) is greater than 4307 (Correction required after an Event in 2007), Subtract Cosmic Rays, Subtract Slopes (Adjusts for Biases across the CCD), Remove Weave (Corrects for Interference from Low Resolution Camera), Flat Field (Corrects for other Characteristics of the CCD) [Note: depending on Viewing Geometry, not all Irregularities can be fixed completely; in particular, a wide Diagonal Stripe may still be Visible], Dayglow Subtract, Nightglow Minimum. For the Low Resolution Camera: Subtract Cosmic Rays, Subtract Slopes, Flat Field, Smooth Filter. The Data Structure is the same as the Raw Image Counts.

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_Tables(Image_Counts(i,j)+1,Filter(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.

PT24S

255

Geographic Grid Overlay in QLC Counts, Image

Time series defined by using: EPOCH

Mapped_ImageO

Image Display with Geographic Grid Overlay in Quasi-Logarithmically Compressed, QLC, Counts, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon.

PT24S

255

Geographic Polar Projection in QLC Counts, Image

Time series defined by using: EPOCH

Mapped_ImageP

Image Display, Azimuthal Projection to Geographic in Quasi-Logarithmically Compressed, QLC, Counts, Fixed Sun Orientation, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon, Intens_Tables.

PT24S

255

Magnetic Local Time (MLT) Invariant Latitude Projection in QLC Counts, Image

Time series defined by using: EPOCH

Mapped_ImageM

Image Display, Azimuthal Projection to Magnetic Local Time and Invariant Latitude in Quasi-Logarithmically Compressed, QLC, Counts, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon.

PT24S

255

Cleaned Ultraviolet Intensity in QLC Counts, Movie

Time series defined by using: EPOCH

Movie_Image

Movie Display of Cleaned Ultraviolet Images in Quasi-Logarithmically Compressed, QLC, Counts

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean.

PT24S

255

Geographic Grid Overlay in QLC Counts, Movie

Time series defined by using: EPOCH

Mapped_MovieO

Movie Display, with Geographic Grid Overlay in Quasi-Logarithmically Compressed, QLC, Counts, use Short Time Spans, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon.

PT24S

255

Geographic Polar Projection in QLC Counts, Movie

Time series defined by using: EPOCH

Mapped_MovieP

Movie Display, Azimuthal Projection to Geographic in Quasi-Logarithmically Compressed, QLC, Counts Fixed Sun Orientation, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon, Intens_Tables.

PT24S

255

Magnetic Local Time (MLT) Invariant Latitude Projection in QLC Counts, Movie

Time series defined by using: EPOCH

Mapped_MovieM

Movie Display, Azimuthal Projection to Magnetic Local Time and Invariant Latitude in Quasi-Logarithmically Compressed, QLC, Counts, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Image_Counts_Clean, Geo_Lat, Geo_Lon.

PT24S

255

Cleaned, Filtered Ultraviolet Intensity, Image

Time series defined by using: EPOCH

IImage_Counts

Cleaned and Filtered Ultraviolet Images. These are Image Pixel Counts that have been calibrated using the following Routines. For the Earth Camera: Horizontal Smooth EC 4 if the Modified Julian Date (MJD) is greater than 3429 (Correction required after an Event in 2005), Horizontal Smooth EC 6 if the Modified Julian Date (MJD) is greater than 4307 (Correction required after an Event in 2007), Subtract Cosmic Rays, Subtract Slopes (Adjusts for Biases across the CCD), Remove Weave (Corrects for Interference from Low Resolution Camera), Flat Field (Corrects for other Characteristics of the CCD) [Note: depending on Viewing Geometry, not all Irregularities can be fixed completely; in particular, a wide Diagonal Stripe may still be Visible], Dayglow Subtract, Nightglow Minimum. For the Low Resolution Camera: Subtract Cosmic Rays, Subtract Slopes, Flat Field, Smooth Filter. The Data Structure is the same as the Raw Image Counts.

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_Tables(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.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Geographic Grid Overlay, Image

Time series defined by using: EPOCH

Mapped_ImageO_kRay

Image Display with Geographic Grid Overlay, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Geographic Polar Projection, Image

Time series defined by using: EPOCH

Mapped_ImageP_kRay

Image Display, Azimuthal Projection to Geographic, Fixed Sun Orientation, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon, Intens_Tables.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Magnetic Local Time (MLT) Invariant Latitude Projection, Image

Time series defined by using: EPOCH

Mapped_ImageM_kRay

Image Display, Azimuthal Projection to Magnetic Local Time and Invariant Latitude, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Cleaned Ultraviolet Intensity, Movie

Time series defined by using: EPOCH

Movie_Image_kRay

Movie Display of Cleaned Ultraviolet Images

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Geographic Grid Overlay, Movie

Time series defined by using: EPOCH

Mapped_MovieO_kRay

Movie Display with Geographic Grid Overlay, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Geographic Polar Projection, Movie

Time series defined by using: EPOCH

Mapped_MovieP_kRay

Movie Display, Azimuthal Projection to Geographic, Fixed Sun Orientation, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon, Intens_Tables.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Magnetic Local Time (MLT) Invariant Latitude Projection, Movie

Time series defined by using: EPOCH

Mapped_MovieM_kRay

Movie Display, Azimuthal Projection to Magnetic Local Time and Invariant Latitude, use Short Time Spans

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_Tables(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. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: IImage_Counts, Geo_Lat, Geo_Lon.

PT24S

kR

1.256637e8>(m^2 s sr)^-1

-1.0e+31

Sensor Number

Sensor

Sensor Number: 0=Earth Camera, 1=Low Resolution Camera, 2=Medium Resolution Camera (never activated)

PT24S

0

2

255

Integration Time (Half)

Time series defined by using: EPOCH

Int_Time_Half

Half of the Length of the Integration Period for the Image measured in ms.

PT24S

ms

1.0e-3>s

0.0

300000.0

-1.0e+31

Filter Number and Peak Wavelength (Å)

Time series defined by using: EPOCH

Filter

Twelve Filters are available for Visible Imaging. The Filter Number, 1-12, is given here. Ultraviolet Imaging is done with one Filter only, which is designated here as Filter Number 0. In Addition, the Peak Wavelength is given in Angstroms for each selected Filter. For detailed Information on Filter Characteristics, see the Text in the Sensitivities_and_Intensities.txt File.

Filters #1-12 are Visible Wavelengths, Filter #0 is Ultraviolet for Earth Camera Images

PT24S

-2147483648

Presumed Altitude of Emissions

Time series defined by using: EPOCH

AltF

Presumed Altitude of Emissions - The presumed Altitude of the Emissions seen in the Image varies with the Characteristics of the Filter used.

PT24S

km

1.0e3>m

0.0

300.0

-1.0e+31

Field-Stop Wheel Position

Time series defined by using: EPOCH

Field_Stop

Field-stop Wheel Position, One Step equals 1.5°

A Field Stop may occult some Part of a Visible Image

PT24S

0

239

-2147483648

Platform Pitch Angle

Time series defined by using: EPOCH

PPitch

Platform Pointing Angle from Nadir - This is the Platform Pointing Angle of Rotation around the Spin Axis measured from Nadir.

Platform Angle of Rotation around Spin Axis, measured from Nadir in Tenths of degrees

PT24S

10°

0.00174532925>rad

-1800

1800

-2147483648

Mirror Elevation Angle

Time series defined by using: EPOCH

Mirr_Elv

Mirror Pointing Angle, Elevation - For the Low or Medium Resolution Camera, the Two-Axis Mirror Position is given in Steps measured from the Instrument Calibration Switches. The Low Resolution Boresight is located at Step 68 in Azimuth and Step 118 in Elevation.

Mirror Pointing Angle out of Spacecraft X-Y Plane in Steps of about 008660 degrees

PT24S

0

255

-2147483648

Mirror Azimuth Angle

Time series defined by using: EPOCH

Mirr_Azm

Mirror Pointing Angle, Azimuth - For the Low or Medium Resolution Camera, the Two-Axis Mirror Position is given in Steps measured from the Instrument Calibration Switches. The Low Resolution Boresight is located at Step 68 in Azimuth and Step 118 in Elevation.

Mirror Pointing Angle of Rotation around Spin Axis, with respect to the Platform Position, in Steps of about 009375 degrees

PT24S

0

255

-2147483648

Geographic Latitude Grid

Time series defined by using: EPOCH

Geo_Lat

Geographic Latitude Grid, provided for each Pixel

Geographic N. Latitude for Pixel Values

PT24S

°

0.0174532925>rad

-1.0e+31

Geographic Longitude Grid

Time series defined by using: EPOCH

Geo_Lon

Geographic Longitude Grid, provided for each Pixel

Geographic E. Longitude for Pixel Values

PT24S

°

0.0174532925>rad

-1.0e+31

Right Ascension, GCI Coordinates

Time series defined by using: EPOCH

Ra

Right Ascension, Geocentric Inertial, GCI, Coordinates, provided for each Pixel

GCI Right Ascension for Pixel Values

PT24S

°

0.0174532925>rad

-1.0e+31

Declination Angle, GCI Coordinates

Time series defined by using: EPOCH

Dec

Declination Angle, Geocentric Inertial, GCI, Coordinates, provided for each Pixel

GCI Declination for Pixel Values

PT24S

°

0.0174532925>rad

-1.0e+31

Altitude at Line-of-Sight

Time series defined by using: EPOCH

ALTLS

Altitude at Line-of-Sight - The Altitude along Tangent to Line-of-Sight, provided for each Pixel

Altitude at Line-of-Sight for Pixel Values

PT24S

km

1.0e3>m

-1.0e+31

Earth Pointing Flag

On_Earth

Earth Pointing Flag: 0=Off Earth, 1=On Earth

Earth Pointing Flag for Pixel Values

PT24S

255

Spacecraft Position Vector, GCI Coordinates

Time series defined by using: EPOCH

SC_Pos_GCI

Spacecraft Position Vector, Geocentric Inertial, GCI, Coordinates - The Spacecraft Position Vectors are for the Image Center Time.

PT24S

km

1.0e3>m

-75000.0

75000.0

-1.0e+31

Spacecraft Velocity Vector, GCI Coordinates

Time series defined by using: EPOCH

SC_Vel_GCI

Spacecraft Velocity Vector, Geocentric Inertial, GCI, Coordinates - The Spacecraft Velocity Vectors are for the Image Center Time.

PT24S

km/s

1.0e3>m/s

-12.0

12.0

-1.0e+31

Spacecraft Spin Axis Unit Vector, GCI Coordinates

Time series defined by using: EPOCH

SC_SpinV_GCI

Spacecraft Spin Axis Unit Vector, Geocentric Inertial, GCI, Coordinates

PT24S

-1.0

1.0

-1.0e+31

Rotation Matrix, Image Coordinates to GCI Coordinates

Time series defined by using: EPOCH

Rotatn_Matrix

Coordinate System Rotation Matrix, Image Coordinates to Geocentric Inertial, GCI, Coordinates - 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. The General Method used is described below in the Coordinate_Calculation.txt File. Column 1 Labels from MATRX_COLUMNS: ["X axis","X axis","X axis"] Column 2 Labels from NORM_CART: ["X(norm)","X(norm)","X(norm)"]

X Component is Look Direction, Y Component is the Spin Axis cross X

PT24S

-1.0e+31

Look Directions

Look_Dir_Vctr

Look Direction Unit Vectors for the Earth Camera - 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. The General Method used is described below in the Coordinate_Calculation.txt File.

PT24S

-1.0e+31

Zenith Angle of Center Line

Time series defined by using: EPOCH

V_Zenith

Zenith Angle of Center Line-of-Sight at Intersection with Earth - This is the Angle between the Geocentric Vector through the observed Point, assuming the Presumed Altitude of Emissions and the Reverse of the Image Center Line-of-Sight Vector.

PT24S

°

0.0174532925>rad

-90.0

90.0

-1.0e+31

Sun Direction Unit Vector, GCI Coordinates

Time series defined by using: EPOCH

Sun_Vctr

Sun Direction Unit Vector, Geocentric Inertial, GCI, Coordinates

PT24S

-1.0

1.0

-1.0e+31

Solar Zenith Angle at Center Line/Earth Intersection

Time series defined by using: EPOCH

S_Zenith

Solar Zenith Angle at Intersection of Center Line-of-Sight with Earth - This is the Angle of the Sun from Zenith at the observed Point of the Center Line-of-Sight, assuming the Altitude given by the Presumed Altitude of Emission

PT24S

°

0.0174532925>rad

-180.0

180.0

-1.0e+31

RGB Color Lookup Table

RGBColorTable

RGB Color Lookup Table - This is the recommended Color Table to be used with the Upper and Lower Color Limits.

RGBColorTable should be remapped for displaying an Image using the low and high Limits given for each Image in Limit_Lo and Limit_Hi. Image_Counts Count Values less than Limit_Lo use the Color at Table Position 1. Count Values greater than Limit_Hi use the Color at Table Position 256. For Count Values greater than or equal to Limit_Lo and less than or equal to Limit_Hi, the Table Position is (Count-Limit_Lo)/(Limit_Hi-Limit_Lo) and#215; 255 + 1. At the selected Table Position C, the Color Components are Red at RGBColorTable(1,C), Green at RGBColorTable(2,C), and Blue at RGBColorTable(3,C).

PT24S

-32768

Color Limit, Lower

Time series defined by using: EPOCH

Limit_Lo

Lower Limit for remapping Color Table to Pixel Range - 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. For Pixel Values greater than or equal to the Low Limit and less than or equal to the High Limit, use the Color at Table Position (pix-low)/(high-low) × 255 + 1. For Pixel Values greater than the High Limit, use the Color at Table Position 256.

PT24S

0

255

-32768

Color Limit, Upper

Time series defined by using: EPOCH

Limit_Hi

Upper Limit for remapping Color Table to Pixel Range - 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. For Pixel Values greater than or equal to the Low Limit and less than or equal to the High Limit, use the Color at Table Position (pix-low)/(high-low) × 255 + 1. For Pixel Values greater than the High Limit, use the Color at Table Position 256.

PT24S

0

255

-32768

Data Quality Flag

Time series defined by using: EPOCH

D_Qual

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 Assignments: Bit 0 - Image Data Frame Sync, Error Bit 1 - Image Data Frame Counters, Error Bit 2 - Image Data Fill Frame Flag.

MSB will not be used as a Flag, see TEXT for other Bit Assignments

PT24S

0

2147483647

-2147483648

Post Gap Flag

Time series defined by using: EPOCH

Post_Gap

Project Standard Value Assignments - 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.

PT24S

0

2147483647

-2147483648

Expanded Count Table

ExpandedCount

Expanded Count Table: Quasi-Logarithmically Uncompressed Pixel Counts - 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.

Image_Counts contains Pixel Counts which have been Quasi-Logarithmically Compressed by the Instrument. Approximate uncompressed Value for Image_Counts(i,j) is ExpandedCount(Image_Counts(i,j)+1).

PT24S

Intensity Tables

Intens_Tables

Approximate Intensity Levels for each Filter - Approximate Intensity Levels in kiloRayleighs are given for each Compressed Count Value. Table Entries 1-256 correspond to Compressed Counts 0-255, respectively. Intensity Calculation is described in the Sensitivities_and_Intensities.txt File.

Approximate Intensity in kR for Image_Counts(i,j) is Intens_Tables(Image_Counts(i,j)+1),Filter(1))

PT24S

kR

1.256637e8>(m^2 s sr)^-1

Image Header Bytes

Time series defined by using: EPOCH

Headers

Image Header Bytes Column 1 Labels from HEADER_BLOCK: [sync byte 1,sync byte 2,sync byte 3,image block type,image block number,highest image block number,block size LSB,block size MSB,X size LSB,X size MSB,Y size LSB,Y size MSB,base,gain,active sensor,filter wheel step,field stop step,azimuth,elevation,nadir high,nadir low,msec_lo LSB,msec_hi MSB,sec_lo LSB,sec_lo NSB,sec_hi MSB,tjd_lo LSB,tjd_hi MSB,image number,CCD status 1 vdump LSB,CCD status 2 vdump MSB,CCD status 3 rdump LSB,CCD status 4 rdump MSB,CCD status 5 oscan LSB,CCD status 6 oscan MSB,CCD status 7 anti-bloom rates,CCD status 8 time base,CCD status 9 hdump LSB,CCD status 10 hdump MSB,CCD status 11 A/D convs LSB,CCD status 12 A/D convs MSB,CCD status 13 cycle LSB,CCD status 14 cycle MSB,CCD status 15 flag bits,CCD status 16 erase,CCD status 17 images,CCD status 18 exp time LSB,CCD status 19 exp time NSB,CCD status 20 exp time MSB,CCD status 21 delay convs,,,orbit clock LSB,orbit clock MSB,MM2S 16 LSB,MM2S 15 MSB,N2S pitch P90 LSB,N2S pitch P90 MSB,sector count LSB,sector count MSB,s-lo LSB at start cycle,s_lo NSB at start cycle,ms_hi MSB at start cycle,sectors exp bits 11-4] Column 2 Labels from HEADER_BLOCK: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

PT24S

255

Image Row Number of Coordinates

image_row_crd

Image Row Number of Coordinates

PT24S

1

256

Image Column Number of Coordinates

image_col_crd

Image Column Number of Coordinates

PT24S

1

256

Row Index of Image Array

image_row

Image Row Number

PT24S

Column Index of Image Array

image_column

Image Column Number

PT24S

Header Block Number

header_block

Header Block Number

PT24S

Header Field Names

hdr_fieldname

Header Field Names

PT24S