LROC Experiment Data Record Wide Angle Camera – VIS (EDRWAV)

EDRWAV – Experiment Data Record Wide Angle Camera – VIS

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 – VIS (EDRWAC) data product is a WAC 5-band visible/near infrared (VIS) 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 VIS, and the other in the Ultraviolet (UV). In color mode, only the center 704 x 14 visible pixels, are read out for each band.

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 VIS WAC are in the table below.

 

Visible

FOV

61.4°

IFOV

1.498 mrad

Image scale (nadir, 50 km altitude)

74.9 m/pixel (binned)

Image frame width

59.6 km

Image format (each band)

704 samples x 14 lines

f/# (Ritchey-Chretien)

5.052

Effective focal length

6.013 mm

Entrance pupil diameter

1.19 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

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 EDRWAV products have the following file names:

MnnnnnnnnnVE.IMG

where:

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

In ODE, EDRWAV products have the following product IDs:

MNNNNNNNNNVE