Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method
We assess the validity of the surface moisture availability parameter (M<sub>o</sub>) derived from satellite-based optical/thermal measurements using the simplified triangle method. First, we show that M<sub>o</sub> values obtained from the simplified triangle method agree cl...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-04-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/12/7/1155 |
| _version_ | 1797571454191009792 |
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| author | Abba Aliyu Kasim Toby Nahum Carlson Haruna Shehu Usman |
| author_facet | Abba Aliyu Kasim Toby Nahum Carlson Haruna Shehu Usman |
| author_sort | Abba Aliyu Kasim |
| collection | DOAJ |
| description | We assess the validity of the surface moisture availability parameter (M<sub>o</sub>) derived from satellite-based optical/thermal measurements using the simplified triangle method. First, we show that M<sub>o</sub> values obtained from the simplified triangle method agree closely with those generated from a soil/vegetation/atmosphere/transfer (SVAT) model for scenes over a field site at the Allahabad district, India. Next, we compared M<sub>o</sub> values from the simplified triangle method for these same overpass scenes with surface soil water content measured at depths of 5 and 15 cm at this field site. Although a very weak correlation exists between remotely sensed values of M<sub>o</sub> for the full scenes and measured soil water content measured at both depths, correlations increasingly improve for the 5 cm samples (but not for the 15 cm samples) as pixels were limited to increasingly smaller vegetation fractions. We conclude that the simplified triangle method would yield reasonable values of M<sub>o</sub> and demonstrate good agreement with ground measurements, provided that validation is limited to pixels with little or no vegetation and to soil depths of 5 cm or less. |
| first_indexed | 2024-03-10T20:40:53Z |
| format | Article |
| id | doaj.art-455b07456fe44bcc996f7dda4df5d1c6 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T20:40:53Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-455b07456fe44bcc996f7dda4df5d1c62023-11-19T20:41:59ZengMDPI AGRemote Sensing2072-42922020-04-01127115510.3390/rs12071155Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle MethodAbba Aliyu Kasim0Toby Nahum Carlson1Haruna Shehu Usman2Department of Geography and Regional Planning, Federal University Dutsin-Ma, Dutsin-Ma PMB 5001, Katsina State, NigeriaDepartment of Meteorology, Penn State University, State College, PA 16801, USASchool of Continuing Education, Bayero University, Kano PMB 3011, Kano State, NigeriaWe assess the validity of the surface moisture availability parameter (M<sub>o</sub>) derived from satellite-based optical/thermal measurements using the simplified triangle method. First, we show that M<sub>o</sub> values obtained from the simplified triangle method agree closely with those generated from a soil/vegetation/atmosphere/transfer (SVAT) model for scenes over a field site at the Allahabad district, India. Next, we compared M<sub>o</sub> values from the simplified triangle method for these same overpass scenes with surface soil water content measured at depths of 5 and 15 cm at this field site. Although a very weak correlation exists between remotely sensed values of M<sub>o</sub> for the full scenes and measured soil water content measured at both depths, correlations increasingly improve for the 5 cm samples (but not for the 15 cm samples) as pixels were limited to increasingly smaller vegetation fractions. We conclude that the simplified triangle method would yield reasonable values of M<sub>o</sub> and demonstrate good agreement with ground measurements, provided that validation is limited to pixels with little or no vegetation and to soil depths of 5 cm or less.https://www.mdpi.com/2072-4292/12/7/1155simplified triangle methodsoil water contentsatellite-based optical/thermal measurementlimitationvalidating |
| spellingShingle | Abba Aliyu Kasim Toby Nahum Carlson Haruna Shehu Usman Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method Remote Sensing simplified triangle method soil water content satellite-based optical/thermal measurement limitation validating |
| title | Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method |
| title_full | Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method |
| title_fullStr | Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method |
| title_full_unstemmed | Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method |
| title_short | Limitations in Validating Derived Soil Water Content from Thermal/Optical Measurements Using the Simplified Triangle Method |
| title_sort | limitations in validating derived soil water content from thermal optical measurements using the simplified triangle method |
| topic | simplified triangle method soil water content satellite-based optical/thermal measurement limitation validating |
| url | https://www.mdpi.com/2072-4292/12/7/1155 |
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