434 REMOTE SENSING/Passive Sensors Table Comparison of spectral bands of TM/ETMỵ, ASTER, and SPOT Sensor systems Terra ASTER Spectral region Band Spectral range (mm) Spatial resolution (m) SWIR TIR 10 11 12 13 14 0.52 0.63 0.78 0.78 0.60 0.69 0.86 0.86 1.60 1.70 2.145 2.185 2.185 2.235 2.295 2.360 8.125 8.475 8.925 10.25 10.95 2.225 2.285 2.365 2.430 8.475 8.825 9.275 10.95 11.65 Spatial resolution (m) Band Spectral range (mm) ETM+ Pan 0.45 0.52 0.63 0.76 0.52 30 1.55 1.75 2.08 2.35 30 90 10.4 12.5 TM 120 VNIR 3N 3B SPOT HRV, SPOT HRVI, SPOT HRG Landsat TM/ETMỵ 15 0.53 0.60 0.69 0.90 0.90 Band Spectral range (mm) Spatial resolution (m) 30 15 Pan 0.50 0.59 20 0.61 0.68 0.79 0.89 SPOT 3: 10 0.51 0.73 SPOT 4: 10 0.61 0.68 SPOT 5: 2.5 0.48 0.71 1.58 1.75 20 Band is only in SPOT HRVI (High Resolution Visible Infrared) and SPOT HRG (High Resolution Geometric) ETM+ 60 Table Some satellite high resolution broadband sensor systems Spatial resolution (m) Spectral range (mm) Pan MS 0.45 0.53 0.52 0.61 0.64 0.72 0.77 0.88 0.45 0.52 0.52 0.60 0.63 0.69 0.76 0.89 0.45 0.52 0.52 0.60 0.625 0.695 0.76 0.90 0.45 0.52 0.52 0.60 0.625 0.695 0.76 0.90 Satellite Launch time and Status Pan MS Ikonos 24 Sept 1999 In operation 0.45 0.90 QuickBird 18 Oct 2001 In operation 0.45 0.90 Orbview 26 June 2003 In operation 0.45 0.90 Orbview Failed at launch in Sept 2001 The MSS with spectral bands on board Landsat 1–3 is a classical example of a mechanical scanner It is a one-way scanner that scans in one direction of mirror rotation only, and with an empty return run Such a design makes compensation of the Earth’s Hyp 0.45 0.90 Hyp 0.45 2.50 200 bands rotation easier, as the Earth rotates a fixed distance along the swath direction for each scanning cycle However, the inactive return would waste valuable time for imaging, resulting in a shorter dwelling time in the active runs and thus reduce spatial resolution