Chandrayaan-1 M3 Raw Image (RAWIMG)

RAWIMG – Raw Image

Instrument: M3

PDS Data Set ID: CH1-ORB-L-M3-2-L0-RAW-V1.0 (DOI: 10.17189/1520225) (in CH1M3_0001 and CH1M3_0002 subdirectories)

For more information about all M3 Image products, see the Data Product SIS.

The Moon Mineralogy Mapper (M3) Raw Image (RAWIMG) data products consist of raw, science data in units of Digital Number (DN) that make up one observation. Processing involves identification of the raw science telemetry packets, processing secondary header time stamps, decompressing the data into 16-bit, signed integers and reassembling the packets into time-sequenced image cubes for further data processing.

M3 captures data in image frames. Each image frame consists of a 1280 byte image frame header, followed by image data. The format of the image data depends on the instrument mode (see the table below) at the time the data were collected. The RAWIMG multiple-band image cube has dimensions of sample, line, and channel, where the first channel of each image frame contains the image frame header.

Description of M3 Operating Modes

M3 Mode

Description

# Channels

# Samples

Format

Target

Produces the maximum spectral resolution science data.

260

640

16-bit Integer

Global

Reduces spectral resolution by 3 times.

  • 4 block of 2x and 4x summing

  • 44 lines of summed by 4x and 42 lines of summed by 2x

The spatial data is summed in a 2 by 2 format.

86

320

16-bit Integer

Contents of an M3 RAWIMG Image Cube File

M3 RAWIMG products have the following file names:

M3xyyyymmddThhmmss_Vzz_L0.IMG (with additional ENVI header and detached PDS label)

where:

x = imaging mode

G = global mode

T = target mode

yyyy = year of the time stamp from the first image frame of the image cube

mm = month of the time stamp from the first image frame of the image cube

dd = day of the time stamp from the first image frame of the image cube

hh = hour in UTC of the time stamp from the first frame of the image cube

mm = minute within in the hour in UTC of the time stamp from the first frame of the image cube

ss = second within the minute in UTC of the time stamp from the first frame of the image cube

zz = two-digit version number of the product (01, 02, etc.)

In ODE, RAWIMG products have the following product IDs:

M3XYYYYMMDDTHHMMSS_VZZ_L0