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Related Concept Videos

Glassware Calibration01:11

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
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Instrument Calibration01:12

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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Root loci often diverge as system poles shift from the real axis to the complex plane. Key points in this transition are the breakaway and break-in points, indicating where the root locus leaves and reenters the real axis. The branches of the root locus form an angle of 180/n degrees with the real axis, where n is the number of branches at a breakaway or break-in point.
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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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Updated: Feb 14, 2026

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling SAHM
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CONTINUOUS CALIBRATION IMPROVEMENT: LANDSAT 5 THROUGH LANDSAT 8.

Nischal Mishra1, Dennis Helder1, Julia Barsi2

  • 1Engineering-Office of Research, South Dakota State University (SDSU), Brookings, SD 57007, USA.

Remote Sensing of Environment
|February 17, 2018
PubMed
Summary

The Landsat 8 Operational Land Imager (OLI) offers high-quality global data due to design enhancements. Its improved radiometric calibration and stability ensure reliable remote sensing for future missions.

Keywords:
Enhanced Thematic Mapper Plus (ETM+)LandsatOperation Land Imager (OLI)Thematic Mapper (TM)radiometric calibration

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Area of Science:

  • Earth Observation
  • Remote Sensing Technology
  • Instrument Calibration

Background:

  • The Landsat 8 satellite, launched in February 2013, carries the Operational Land Imager (OLI).
  • OLI incorporates design improvements over previous Landsat instruments, including enhanced Signal-to-Noise Ratio (SNR) and refined spectral bandpasses.
  • A 12-bit data resolution increases dynamic range and reduces saturation.

Purpose of the Study:

  • To evaluate the radiometric calibration performance and stability of the Operational Land Imager (OLI) on Landsat 8.
  • To assess the impact of OLI's design enhancements on data quality and long-term monitoring capabilities.
  • To compare OLI's calibration performance with earlier Landsat instruments.

Main Methods:

  • Utilizing onboard calibrator lamps and diffusers to monitor sensor stability.
  • Analyzing spectral bandpass refinements for improved radiometric accuracy.
  • Trending instrument performance over Pseudo Invariant Calibration Sites (PICS) for vicarious calibration.
  • Comparing stability measurements from onboard calibrators and PICS with historical Landsat data.

Main Results:

  • OLI demonstrates exceptional performance with instrument drift typically below 0.1% annually across bands.
  • Refined spectral bandpasses enable temporal uncertainty of better than 0.5% when calibrated over PICS.
  • Onboard calibrator and PICS stability measurements show significantly improved agreement compared to previous Landsat missions.
  • OLI's enhanced radiometric calibration provides greater stability and tracking of changes.

Conclusions:

  • The design enhancements in OLI have led to superior radiometric calibration performance and stability.
  • OLI's precision and reliability set a new standard for Landsat missions, ensuring high-quality Earth observation data.
  • The improved agreement between onboard and vicarious calibration methods bodes well for the continuity and success of future Landsat missions.