Cloud-Top Heights from<i>GOES-8</i>and<i>GOES-9</i>Stereoscopic Imagery

Wylie, Donald P.; Santek, David; Starr, David Oc.

doi:10.1175/1520-0450(1998)037<0405:cthfga>2.0.co;2

Cited by 27 publications

(29 citation statements)

References 22 publications

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“…The resulting average differences between MISR and radar cloud-top heights were calculated as −0.6±0.6 km (SGP) and −0.2±0.5 km (CFARR). These results imply that MISR cloud-top heights show a slight low bias, mainly because the stereo technique is tuned to detect the area in the cloud that has the brightest contrast, which does not necessarily coincide with the highest levels in the cloud (Wylie et al, 1998). However, the low bias is slightly larger at SGP where clouds are at higher altitude (Fig.…”

Section: Intercomparison Between Misr and Radar-cloud-top Heightsmentioning

confidence: 93%

“…Stereoscopic techniques have been applied to cloud height retrievals for more than 20 years now, in particular from geostationary data (e.g. Hasler, 1981;Wylie et al, 1998). Stereo cloud-top heights were found to be in good agreement with techniques such as CO 2 -slicing, with a similar tendency to be tuned to the level of greater contrast within the cloud but not necessarily at the cloud-top (Wylie and Menzel, 1989;Naud et al, 2004).…”

Section: Misrmentioning

confidence: 94%

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Intercomparison of multiple years of MODIS, MISR and radar cloud-top heights

et al. 2005

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Abstract. Radar cloud-top heights were retrieved at both the Chilbolton Facility for Atmospheric and Radio Research, UK (CFARR) and the ARM Southern Great Plain site, USA (SGP), using millimetre wave cloud radars and identical algorithms. The resulting cloud-top heights were used for comparison with MODIS and MISR retrieved cloud-top heights, from March 2000 to October 2003. Both imaging instruments reside on the NASA Earth Observing System (EOS) Terra platform launched in 1999. MODIS and MISR cloud-top products were from the recent collections (4 and 3, respectively) that cover the entire mission. The cloud characteristics are different at each ground site, with clouds generally residing at higher altitudes at SGP, but with a greater occurrence of broken or multilayered clouds at CFARR. A method is presented to automatically eliminate scenes where clouds are of a broken nature, since it is difficult in these conditions to ensure that ground-based and satellite measurements refer to the same cloud deck. The intercomparison between MODIS and radar cloud-top heights reveals that MODIS cloud-top heights agree with radar within about 1 km for mid-and high-level clouds. However, this accuracy is degraded to nearly 3 km for low-level clouds. MISR cloud-top heights are found to agree with radar cloud-top heights to within 0.6 km, which is in line with theoretical expectations. In single-level cloud situations MODIS and MISR cloud-top heights tend to agree within 1 km. This comparison also reveals that the loss of radar sensitivity during 2001 resulted in the CFARR instrument being less accurate for high-level cloud-top height measurements.

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Section: Intercomparison Between Misr and Radar-cloud-top Heightsmentioning

confidence: 93%

Section: Misrmentioning

confidence: 94%

Intercomparison of multiple years of MODIS, MISR and radar cloud-top heights

et al. 2005

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“…Stereoscopy from geostationary satellites was also used for monitoring cumulonimbus clouds (Hasler et al, 1991), for research on convective clouds (Fujita, 1982;Mack et al, 1983), and for developing climatologic cloud monitoring systems (Wylie and Menzel, 1989). Because of the malfunction on GOES 6, the development in this field stopped until GOES 8 and GOES 9 were launched (Wylie et al, 1998). In the studies listed above the cloud top was determined from a pair of GOES satellites.…”

Section: Acth Based On Stereoscopymentioning

confidence: 99%

Monitoring volcanic ash cloud top height through simultaneous retrieval of optical data from polar orbiting and geostationary satellites

et al. 2013

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Volcanic ash cloud-top height (ACTH) can be monitored on the global level using satellite remote sensing. Here we propose a photogrammetric method based on the parallax between data retrieved from geostationary and polar orbiting satellites to overcome some limitations of the existing methods of ACTH retrieval. SEVIRI HRV band and MODIS band 1 are a good choice because of their high resolution. The procedure works well if the data from both satellites are retrieved nearly simultaneously. MODIS does not retrieve the data at exactly the same time as SEVIRI. To compensate for advection we use two sequential SEVIRI images (one before and one after the MODIS retrieval) and interpolate the cloud position from SEVIRI data to the time of MODIS retrieval. The proposed method was tested for the case of the Eyjafjallajökull eruption in April 2010. The parallax between MODIS and SEVIRI data can reach 30 km, which implies an ACTH of approximately 12 km at the beginning of the eruption. At the end of April eruption an ACTH of 3–4 km is observed. The accuracy of ACTH was estimated to be 0.6 km

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“…However, the lack of any suitable long-term datasets and the difficulty in having to use 6-bit gray-level 1-km visible imagery has resulted in very limited use by the meteorological community. Wylie et al [5] recently showed much improved results using GOES-S and GOES-9, whereas [6] demonstrated that one can combine thermal IR-based brightness temperatures to reduce the computational time necessary for stereo matching. A constellation of MISR-like instruments on polar-orbiting platforms could provide extremely useful wind and cloud-top height data for the operational weather forecasting community.…”

Section: Introductionmentioning

confidence: 99%