| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Sao Paulo State Univ, UNESP, Presidente Prudente, SP - Brazil
[2] Finnish Geospatial Res Inst, Masala, Kirkkonununi - Finland
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING; v. 147, p. 345-360, JAN 2019. |
| Web of Science Citations: | 5 |
| Abstract | |
Miniaturised 2D frame format hyperspectral camera technology that is suitable for small unmanned aerial vehicles (UAVs) has entered the market, making the generation of hyperspectral digital surface models (HDSMs) feasible. HDSMs offer a rigorous approach to capturing the target spectral and 3D geometric data. The main objective of this investigation was to study and develop techniques for the generation of HDSMs in forest areas using novel hyperspectral 2D frame camera technologies. An approach based on object-space image matching was developed, adapting the traditional vertical line locus (VLL) method for HDSM generation; this was then named the hyperspectral VLL (HVLL) approach. Additionally, image classification was introduced into the processing chain in order to adapt the matching parameters, based on different classes. We also proposed a method for extracting the spectral and viewing angle information of the points. An empirical study was carried out using UAV datasets from tropical and boreal forests using 2D format hyperspectral cameras, based on tuneable Fabry-Perot interferometer (FPI) technology. Quality assessment was performed using DSMs based on state-of-the-art commercial software and airborne laser scanning (ALS). The results showed that the proposed technique generated a high-quality HDSM in both tested environments. The HDSM had higher deviations over the continuous canopy cover than the digital surface models (DSMs) generated using commercial software. The method using image classification information outperformed the commercial approach with respect to the ability to measure ground points in shadowed areas and in canopy gaps. The proposed method is of great interest in supporting automated interpretations of novel multi- and hyperspectral imaging technologies, especially when applied complex objects, such as forests. (AU) | |
| FAPESP's process: | 14/24844-6 - Generation of DSM based on segmentation and classification of hyperspectral image |
| Grantee: | Raquel Alves de Oliveira |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 13/50426-4 - Unmanned airborne vehicle-based 4D remote sensing for mapping Rain Forest biodiversity and its change in Brazil (UAV_4D_Bio) |
| Grantee: | Antonio Maria Garcia Tommaselli |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/17787-3 - DEVELOPMENT AND ASSESSMENT OF TECHNIQUES FOR GENERATION OF DENSE POINTS CLOUD USING HYPERSPECTRAL IMAGES ACQUIRED BY UAV |
| Grantee: | Raquel Alves de Oliveira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |