ASSESSMENT OF CANOPY AND GROUND HEIGHT ACCURACY FROM GEDI LIDAR OVER STEEP MOUNTAIN AREAS
نویسندگان
چکیده
Abstract. Active remote sensing systems orbiting the Earth are only a small portion of current constellation satellites and will increase in number advance technology future. The launch GEDI sensor December 2018, for an expected life-span period about 2 years, is fundamental step this revolution, as it first spaceborne full-waveform lidar specifically designed measuring structure ecosystems, providing information vertical profile forests.Accuracy assessment height metrics context Alpine forest environment steep terrain scenarios has been conducted study. We used discrete return from recent aerial laser scanner survey reference to analyse differences heights elevation maximum canopy vegetation detected each footprint. between data were then analysed verify any correlation with following factors: morphology (terrain slope), land cover (land type, fraction cover, density), beam characteristics (day/night-time acquisition, full power vs coverage beam, ID, sensitivity). Further analysis involved shifting footprints’ location 8 different direction 4 distances assess impact geolocation errors on accuracy precision.Results show that what most influences study slope, very likely linked uncertainty footprints, suggesting caution using single footprints if located environments. Other than varies mostly type (conifer broadleaves), but not significantly other factors. Canopy instead affected by factors; high overestimated ?3 m GEDI, underestimated 3 over heath bushes (median difference). Higher sensitivity pulses night-time provide better accuracy. Laser beams also have accuracy; id 1000 1011 accurate heights. Shifting footprint position decreased except at 15 270° respect orbit (left-looking).
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ژورنال
عنوان ژورنال: ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
سال: 2022
ISSN: ['2194-9042', '2194-9050', '2196-6346']
DOI: https://doi.org/10.5194/isprs-annals-v-3-2022-431-2022