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Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador.

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Title: Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador.
Authors: Bendix, J.1 bendix@Jstaff.uni-marburg.de, Rollenbeck, R.1, Palacios, W. E.1,2
Source: International Journal of Remote Sensing. 11/10/2004, Vol. 25 Issue 21, p4521-4540. 20p.
Subjects: Clouds, Biotic communities, Mountains
Geographic Terms: Tropics, Ecuador
Abstract: The detection of clouds and the analysis of cloud frequency play an important role for operational weather prediction as well as for climate-ecological studies. A threshold technique for cloud detection in the tropical mountainous area of Ecuador is presented which is based on National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (NOAA-AVHRR) data. Cloud classification is performed for both day and night overpasses by applying several threshold tests which also include ancillary terrain information. From a set of 155 images, maps of relative cloud frequency are calculated for Ecuador and adjacent areas as well as the central study area of an ecological project in southern Ecuador (Loja). Results show a clear relation between topography, main airflow and cloudiness due to barrage and lee-effects. The spatial extension of high mountain ecosystems such as the Ecuadorian Páramo has been proven to be significantly influenced by the spatial pattern of cloud frequency. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Remote Sensing is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador.
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  Data: <searchLink fieldCode="AR" term="%22Bendix%2C+J%2E%22">Bendix, J.</searchLink><relatesTo>1</relatesTo><i> bendix@Jstaff.uni-marburg.de</i><br /><searchLink fieldCode="AR" term="%22Rollenbeck%2C+R%2E%22">Rollenbeck, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Palacios%2C+W%2E+E%2E%22">Palacios, W. E.</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Remote+Sensing%22">International Journal of Remote Sensing</searchLink>. 11/10/2004, Vol. 25 Issue 21, p4521-4540. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Clouds%22">Clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Biotic+communities%22">Biotic communities</searchLink><br /><searchLink fieldCode="DE" term="%22Mountains%22">Mountains</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Tropics%22">Tropics</searchLink><br /><searchLink fieldCode="DE" term="%22Ecuador%22">Ecuador</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The detection of clouds and the analysis of cloud frequency play an important role for operational weather prediction as well as for climate-ecological studies. A threshold technique for cloud detection in the tropical mountainous area of Ecuador is presented which is based on National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (NOAA-AVHRR) data. Cloud classification is performed for both day and night overpasses by applying several threshold tests which also include ancillary terrain information. From a set of 155 images, maps of relative cloud frequency are calculated for Ecuador and adjacent areas as well as the central study area of an ecological project in southern Ecuador (Loja). Results show a clear relation between topography, main airflow and cloudiness due to barrage and lee-effects. The spatial extension of high mountain ecosystems such as the Ecuadorian Páramo has been proven to be significantly influenced by the spatial pattern of cloud frequency. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Remote Sensing is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=15243404
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        Value: 10.1080/01431160410001709967
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      – Code: eng
        Text: English
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        PageCount: 20
        StartPage: 4521
    Subjects:
      – SubjectFull: Clouds
        Type: general
      – SubjectFull: Biotic communities
        Type: general
      – SubjectFull: Mountains
        Type: general
      – SubjectFull: Tropics
        Type: general
      – SubjectFull: Ecuador
        Type: general
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      – TitleFull: Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador.
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              Text: 11/10/2004
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              Y: 2004
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