Measurements of land surface features using an airborne laser altimeter: the HAPEX-Sahel experiment
| Autor: | J. C. Ritchie, M.A. Weltz, Massimo Menenti |
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| Rok vydání: | 1996 |
| Předmět: |
applications
toepassingen Winand Staring Centre for Integrated Land Soil and Water Research Soil and Water Research vegetatie landgebruik law.invention remote sensing Staring Centrum vegetation law Altimeter Transect Remote sensing Vegetation height research zoning land use sahel zonering Plant community Laser onderzoek plant communities Physical planning Winand Staring Centre for Integrated Land ruimtelijke ordening General Earth and Planetary Sciences Environmental science Tiger bush physical planning Laser methods lasers plantengemeenschappen |
| Zdroj: | International Journal of Remote Sensing 17 (1996) 18 Scopus-Elsevier International Journal of Remote Sensing, 17(18), 3705-3724 |
| ISSN: | 1366-5901 0143-1161 |
| DOI: | 10.1080/01431169608949179 |
| Popis: | An airborne laser profiling altimeter was used to measure surface features and properties of the landscape during the HAPEX-Sahel Experiment in Niger, Africa in September 1992. The laser altimeter makes 4000 measurements per second with a vertical resolution of 5 cm. Airborne laser and detailed field measurements of vegetation heights had similar average heights and frequency distribution. Laser transects were used to estimate land surface topography, gully and channel morphology, and vegetation properties ( height, cover and distribution). Land surface changes related to soil erosion and channel development were measured. For 1 km laser transects over tiger bush communities, the maximum vegetation height was between 4-5 and 6-5 m, with an average height of 21 m. Distances between the centre of rows of tiger bush vegetation averaged 100 m. For two laser transects, ground cover for tiger bush was estimated to be 225 and 301 per cent for vegetation greater than 0-5m tall and 190 and 25-8 per cent f... |
| Databáze: | OpenAIRE |
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