Cloud height determination by satellite stereography.

Takashima, Tsutomu; Takayama, Y.; Matsuura, Kazuo; Naito, Keikichi

doi:10.2467/mripapers.33.65

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…Satellite stereo-photogrammetry is a promising technique for deriving AMVs with an alternative height assignment method, and the technique has been used since the beginning of the space era [19][20][21][22][23][24][25]. Since the pattern matching for stereo height uses the same matching algorithm used for AMV determination, the height from the stereo method should be most representative of the pattern height.…”

Section: Amvs and Height Assignmentsmentioning

confidence: 99%

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

Carr¹,

Kelly

et al. 2018

Remote Sensing

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Global wind observations are fundamental for studying weather and climate dynamics and for operational forecasting. Most wind measurements come from atmospheric motion vectors (AMVs) by tracking the displacement of cloud or water vapor features. These AMVs generally rely on thermal infrared (IR) techniques for their height assignments, which are subject to large uncertainties in the presence of weak or reversed vertical temperature gradients near the planetary boundary layer (PBL) and tropopause folds. Stereo imaging can overcome the height assignment problem using geometric parallax for feature height determination. In this study we develop a stereo 3D-Wind algorithm to simultaneously retrieve AMV and height from geostationary (GEO) and low Earth orbit (LEO) satellite imagery and apply it to collocated Geostationary Operational Environmental Satellite (GOES) and Multi-angle Imaging SpectroRadiometer (MISR) imagery. The new algorithm improves AMV and height relative to products from GOES or MISR alone, with an estimated accuracy of <0.5 m/s in AMV and <200 m in height with 2.2 km sampling. The algorithm can be generalized to other LEO-GEO or LEO-LEO combinations for greater spatiotemporal coverage. The technique demonstrated with MISR and GOES has important implications for future high-quality AMV observations, for which a low-cost constellation of CubeSats can play a vital role.

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Section: Amvs and Height Assignmentsmentioning

confidence: 99%

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

Carr¹,

Kelly

et al. 2018

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…Satellite stereo-photogrammetry is a promising technique for deriving AMVs with an alternative height assignment method, and the technique has been used since the beginning of the space era [17][18][19][20][21][22][23]. Since the pattern matching for stereo height uses the same matching algorithm used for AMV determination, the height from the stereo method should be most representative of the pattern height.…”

Section: Amvs and Height Assignmentsmentioning

confidence: 99%

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

Carr¹,

Wu²,

Kelly³

et al. 2018

Preprint

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Global wind observations are fundamental for studying weather and climate dynamics. Most wind measurements come from atmospheric motion vectors (AMVs) by tracking the displacement of cloud or water vapor features. These AMVs generally rely on thermal infrared (IR) techniques for their height assignments, which are subject to large uncertainties in the presence of weak or reversed vertical temperature gradients around the planetary boundary layer (PBL) and with tropopause folding. Stereo imaging can overcome the height assignment problem using geometric parallax for feature height determination. In this study we develop a stereo 3D-Wind algorithm to simultaneously retrieve AMV and height from geostationary (GEO) and low Earth orbit (LEO) satellite imagery and apply it to collocated Geostationary Operational Environmental Satellite (GOES) and Multi-angle Imaging SpectroRadiometer (MISR) imagery. The new algorithm improves AMV and height relative to products from GOES or MISR alone, with an estimated accuracy of <0.5 m/s in AMV and <200 m in height with 2.2 km sampling. The algorithm can be generalized to other LEO-GEO or GEO-GEO combinations for greater spatiotemporal coverage. The technique demonstrated with MISR and GOES has important implications for future high-quality AMV observations, for which a low-cost constellation of CubeSats can play a vital role.

show abstract

“…Satellite stereo-photogrammetry is a well-known technique to determine cloud top height (or stereo height) in addition to cloud motion [2][3][4][5][6][7][8][9]. Imaging cloud features from multiple view angles usually requires a horizontal pixel resolution higher than 1 km for an appreciable vertical resolution.…”

Section: Introductionmentioning

confidence: 99%

A GEO-GEO Stereo Observation of Diurnal Cloud Variations over the Eastern Pacific

Wu,

Carr,

Friberg

et al. 2024

Remote Sensing

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Fast atmospheric processes such as deep convection and severe storms are challenging to observe and understand without adequate spatiotemporal sampling. Geostationary (GEO) imaging has the advantage of tracking these fast processes continuously at a cadence of the 10 min global and 1 min mesoscale from thermal infrared (TIR) channels. More importantly, the newly-available GEO-GEO stereo observations from our 3D-Wind algorithm provide more accurate height assignment for atmospheric motion vectors (AMVs) than those from conventional TIR methods. Unlike the radiometric methods, the stereo height is insensitive to radiometric TIR calibration of satellite sensors and can assign the feature height correctly under complex situation (e.g., multi-layer clouds and atmospheric inversion). This paper shows a case study from continuous GEO-GEO stereo observations over the Eastern Pacific during 1–5 February 2023, to highlight diurnal variations of clouds and dynamics in the planetary boundary layer (PBL), altocumulus/congestus, convective outflow and tropical tropopause layer (TTL). Because of their good vertical resolution, the stereo observations often show a wind shear in these cloud layers. As an example, the stereo winds reveal the classic Ekman spiral in marine PBL dynamics with a clockwise (counterclockwise) wind direction change with height in the Northern (Southern) Hemisphere subtropics. Over the Southeastern Pacific, the stereo cloud observations show a clear diurnal variation in the closed-to-open cell transition in the PBL and evidence of precipitation at a lower level from broken stratocumulus clouds.

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Cloud height determination by satellite stereography.

Cited by 7 publications

References 3 publications

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

MISR-GOES 3D Winds: Implications for Future LEO-GEO and LEO-LEO Winds

A GEO-GEO Stereo Observation of Diurnal Cloud Variations over the Eastern Pacific

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