XXII ISPRS Congress 2012: Technical Commission VIII

Shortis, M.; Shimoda, H.; Cho, K.

Bibliographic data

Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663822514

Title:: Technical Commission VIII

Scope:: 590 Seiten

Year of publication:: 2014

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663822514

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Shortis, M.; Shimoda, H.; Cho, K.

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VIII/6: Agriculture, Ecosystems and Bio-Diversity]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: PLANT SPECIES MONITORING IN THE CANARY ISLANDS USING WORLDVIEW-2 IMAGERY L. Nunez-Casillas, F. Micand, B. Somers, P. Brito, M. Arbelo

Document type:: Multivolume work

Structure type:: Chapter

2. DATA AND METHODS A WV-2 image from March 21* was used in this study (figure 1). The image was pre-processed and atmospherically corrected. Field reflectance measurements in the study area coincident with the satellite image acquisition, contributed to the validation of the atmospheric correction. Figure 1. True color combination of WV2 image for the study area, and description of the three main vegetation covers present. 2.1 Spectral libraries Two sets of spectra were collected for different species. 2.1.1 From pure image pixels: The first field dataset was a compilation of GPS locations where species were identified. The WV2 spectral signatures from the purest pixels were used later as endmembers in MESMA: the species registered were M. faya (12), L. novocanariensis (6) and Pinus radiata (15), and spectral signatures for herbaceous species and fern (19) in degraded areas were also collected. 2.1.2 From field measurements: The second set was obtained from ASD FieldSpec 3 JR reflectance measurements in stands of M. faya, L. novocanariensis and E. arborea. A total of 69 spectral signatures were collected during a 4-day field campaign, including the day of the WV2 pass (March 14*, 15". 20^ and 21%). International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia ASD field WV2 pure Empirical Wavelength | signature for | pixels signature calibration (nm) M. faya for M. faya ASD > WV2 427 0.0111 0.0037 -0.0074 478 0.0137 0.0157 0.0019 546 0.0302 0.0299 -0.0003 608 0.0267 0.0296 0.0029 659 0.0214 0.0243 0.0029 724 0.1630 0.1368 -0.0262 831 0.3153 0.2573 -0.0580 908 0.3454 0.2669 -0.0786 Table 1. Empirical calibration parameters resulting from the comparison between M. faya field and WV2 image samples. —ADiield TESAIMpled ese spectral signatures (E. arborea) Reflectance 427 478 546 608 659 724 831 908 Wavelength (nm) eee E. arborea flowered = = E. arborea flowered (average) -" E arborea green E. arborea green (average) 0.4 o WM 2-callibrated té tr I ta ERE spectral signatures 0.3 - Reflectance 427 478 546 608 659 724 831 908 Wavelength (nm) E. arborea flowered == == [ arborea flowered (average) E. arborea green E. arborea green (average) Figure 2. Empirical calibration of field spectra from Erica arborea measurements for endmember extraction in WV2 image. Two patterns noticeable between different phenological stages. 2.1.3 From re-calibrated field measurements: Given its less defined crowns compared to other species, it was difficult to identify pure image pixels for E. arborea, only with ASD measurements available. This was solved empirically by comparing ASD and WV2 spectra in other species where both data sets were available, and then obtaining a conversion coefficient to each band (table 1). These coefficients were added to E. arborea ASD spectra as a calibration method to obtain WV2-adjusted spectra (figure 2). 2.2 Forest mapping First, a NDVI threshold (Rouse et al., 1973)) was used to mask out all non-vegetation areas in the study area. Only pixels with NDVI > 0.5 were included in MESMA. Two unmixing cycles were applied. In the first cycle (mesmal), three endmember libraries were used: M. faya + L. novocanariensis -because of their spectral and ecological similarity they were fused together-, E. arborea and herbaceous/fern. For the second MESMA (mesma2) cycle only the pixels with a sub-pixel cover fraction estimate above 80% of M. faya + L. novocanariensis were analyzed. This second cycle allowed us to differentiate between the main dominant tree species in the area: M. faya, L. novocanariensis and P. radiata. Inte Prelir conse Howe very (figur

Access restriction

Copyright

fullscreen: Technical Commission VIII (B8)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation