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Instrument

 
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ARSF Airborne Thematic Mapper (ATM) Azimuth systems 16 (AZ-16)

Status: Not defined
Publication State:

Abstract

NERC ARSF ATM AZ-16 Airborne Thematic Mapper operated from 1996 to present

Abbreviation: ATM, AZ-16
Keywords: Not defined

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instrumentType:      Instrument
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Previously used record indentifiers:
http://badc.nerc.ac.uk/view/neodc.nerc.ac.uk__ATOM__dpt_11637772506911558

More Information (under review)


Airborne Thematic Mapper (ATM)

  • ATM Background information:

    The NERC Airborne Research and Survey Facility (ARSF) has flown two ATM instruments over the period 1982 - present: the Daedalus 1268 was operated from 1982 until 1998. Since 1996 an upgraded version - the Azimuth Systems AZ-16 has been used, along with an improved data acquisition system.

    The eleven spectral channels of these instruments cover the visible and near-infrared (Chs: 1-8), shortwave infrared (SWIR - Chs: 9 & 10) and thermal infrared (TIR - Ch: 11) many of which closely match the seven channels of the Landsat Thematic Mapper satellite (see Fig.1 and Table 1):

    ATM Band Spectral range (μ m) Equivalent Landsat TM band
    1 0.42 - 0.45
    2 0.45 - 0.52 1
    3 0.52 - 0.60 2
    4 0.605 - 0.625
    5 0.63 - 0.69 3
    6 0.695 - 0.75
    7 0.76 - 0.90 4
    8 0.91 - 1.05
    9 1.55 - 1.75 5
    10 2.08 - 2.35 7
    11 8.5 - 13.0# 6
    12 Spare thermal channel

    Table 1. Band characteristics of the Daedalus 1268 Airborne Thematic Mapper instrument compared to those of the Landsat Thematic Mapper instrument. [# Thermal band broadened for aircraft operation.]

    Figure 1. Comparison of ATM and LANDSAT-7 bands in the visible and near-infrared spectrum. ATM band 11 (not shown) is in the thermal infrared region, spanning 8400-11500 nm. Landsat-7 Band 8 (not shown) is a panchromatic band spanning the region 520-900 nm.

    Comparative Specifications of the Airborne Thematic Mapper - in its Daedalus 1268 and AZ-16 configurations?are provided in Table 2, below:

    Daedalus 1268 AZ-16
    Operational period 1982-1985 1996-present
    IFOV 2.5 mrad 2.5 mrad
    Pixel swath 716 992/1984
    Digitised FOV 86 ° 90 °
    S-bend correction 73 °
    Scan rate 12.5, 25, 50 Hz 12.5, 25, 50 Hz
    Roll correction +/-15 °
    Resolution 8-bit (0-255) 16-bit (0-65535)
    Thermal channel calibration Two black bodies

    Table 2. Comparison of Daedalus 1268 and AZ-16 systems.

    A fully automated Integrated Data System (IDS) was commissioned in late 1998/early 1999 and can now routinely provide geometrically registered, radiometrically calibrated data for both the multi-spectral ATM and the hyper-spectral CASI systems as operated by the NERC Airborne Research and Survey Facility.

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