LROC Experiment Data Record Wide Angle Camera (EDRWAC)

EDRWAC – Experiment Data Record Wide Angle Camera

Instrument:

Lunar Reconnaissance Orbiter Camera

PDS Data Set ID: LRO-L-LROC-2-EDR-V1.0

For more information about LROC EDR products, see the EDR Product SIS.

For more information about all LROC products, see the LROC Archive Volume SIS.

The Lunar Reconnaissance Orbiter Camera (LROC) Experiment Data Record Wide Angle Camera – Color (EDRWAC) data product is a WAC 7-band color image corresponding to a series of framelets, with Digital Number (DN) counts in 8-bit format, companded from 11-bit in the instrument. Each framelet is in row-major order. The EDRWAC stores multispectral framelets in a single band.

The WAC has two lenses imaging onto the same 1024 x 1024 pixel, electronically shuttered CCD area-array, one image in the visible/near infrared (VIS), and the other in the Ultraviolet (UV). In color mode, only the center 704 x 14 visible pixels and 512 x 16 UV pixels binned to 128 x 4 pixels, are read out for each band (320 nm, 360 nm, 415 nm, 565 nm, 605 nm, 645 nm, and 690 nm).

The image file consists of frames in row-major order with a 4 byte validity marker separating each frame. If compression was enabled at image acquisition, the data stream is first decompressed before further processing is performed. Information from the meta-file, housekeeping, and the SOC database are combined to generate the PDS label that combined with the binary data to produce the EDR file.

Specifications for the Color WAC are in the table below.

	Visible	UV
FOV	61.4°	58.96°
IFOV	1.498 mrad	7.67 mrad (4x4 binned)
Image scale (nadir, 50 km altitude)	74.9 m/pixel	383.5 m/pixel (binned)
Image frame width	59.6 km	56.8 km
Image format (each band)	704 samples x 14 lines	128 samples x 4 lines (binned)
f/# (Ritchey-Chretien)	5.052	5.65
Effective focal length	6.013 mm	4.693 mm
Entrance pupil diameter	1.19 mm	0.85 mm
System MTF (Nyquist)	0.37
Gain	25.9 ± 0.7 e-/DN
Noise	66 ± 4 e-
Detector fullwell	46,100 ± 3600 e-
Band | λeff | FWHM	320 nm 321 nm 32.3 nm 360 nm 360 nm 14.9 nm 415 nm 415 nm 36.1 nm 565 nm 566 nm 20.1 nm 605 nm 604 nm 20.4 nm 645 nm 643 nm 22.5 nm 690 nm 689 nm 38.6 nm
SNR (at 1000 DN)	> 150
Detector digitization	11-bit, encoded to 8-bits
Lossless compression ratio	1.7:1
Electronics	4 circuit boards
Detector	Kodak KLA-1001
Pixel format	1,024 x 1,024
Voltage	28 ± 7V DC
Peak power	2.7 W
Orbit average power	2.6 W
Mass	0.9 kg
Volume (width x length x height)	15.8 cm x 23.2 cm x 32.3 cm (incl. radiator)

LROC EDRWAC products have the following file names:

tnnnnnnnnnCE.IMG

where:

t = target

M = Moon

E = Earth

C = calibration

S = star

nnnnnnnnn = 9-digit Mission Elapsed Time of acquisition (with a single digit for partition which denotes a reset of the MET)

In ODE, EDRWAC products have the following product IDs:

TNNNNNNNNNCE