XXII ISPRS Congress 2012: Technical Commission VII

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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:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

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

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

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:: [VII/1: PHYSICAL MODELLING AND SIGNATURES IN REMOTE SENSING]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: SENSITIVITY ANALYSIS IN THE RETRIEVAL OF TURBID COASTAL WATER BATHYMETRY USING WORLDVIEW-2 SATELLITE DATA S. C. Liew, C. W. Chang, L. K. Kwoh

Document type:: Multivolume work

Structure type:: Chapter

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia SENSITIVITY ANALYSIS IN THE RETRIEVAL OF TURBID COASTAL WATER BATHYMETRY USING WORLDVIEW-2 SATELLITE DATA S. C. Liew*, C. W. Chang, L. K. Kwoh Centre for Remote Imaging, Sensing and Processing (CRISP), National University of Singapore, Blk. S17 Level 2, Lower Kent Ridge Road, Singapore 119076 (crslsc, crscew, crsklk,)@nus.edu.sg Commission VII/1 KEY WORDS: Bathymetry, turbid waters, ocean color ABSTRACT: The recently launched Worldview-2 satellite provides high resolution (2-m multispectral) data in eight spectral bands in the visible to near-infrared region. The additional spectral bands provide an opportunity to test several algorithms for retrieving the water depth, bottom albedo and intrinsic optical properties of coastal sea water. In a previous work (Liew et al., 2011) we reported our attempts in retrieving water depth and bottom albedo using WorldView-2 data for the purpose of coastal habitat mapping. In this paper, we investigate the sensitivity and limitations in using WorldView-2 spectral bands for bathymetry retrieval in turbid coastal waters. For typical coastal waters with a dark seabed, the most sensitive band is the Green Band which is sensitive to water depth up to about 5.3 m. For coastal waters with a bright sandy seabed, the Red and Yellow Bands are the most sensitive, but the maximum sensitive depth is reduced to about 2.4 m. 1. INTRODUCTION High spatial resolution satellite sensors are usually designed for land applications. These sensors typically have a small number of broad spectral bands. Ideally, hyperspectral data are preferable for retrieving water optical properties and water depth (Lee et al, 2002) as the complete water reflectance spectra are available for fitting with specific models of water reflectance. Despite the limited number of spectral bands, attempts have been made in deriving the intrinsic optical properties, water depth and sea bottom albedo using data from high resolution satellites such as the SPOT-5 satellite (Liew and He, 2008) which has 4 spectral bands in the green, red, near infrared and short-wave infrared regions. The recently launched WorldVview-2 satellite sensor has 8 spectral bands and holds the potential to be used for deriving optical properties and bathymetric maps from littoral zone waters. In our previous work, bathymetric and coastal habitual maps were derived from WorldView-2 images (Liew et al., 2011). For deriving the optical properties of water, most ocean colour satellite sensors have spectral bands with a narrow bandwidth of about 10 to 20 nm. The spectral bands are selected at different positions to pick up absorption signatures of phytoplankton and to overcome the non-linear relationships between ocean colour and optical properties of various constituents. It will be of interests to evaluate possible limitations due to the broad bandwidth in deriving optical properties and bathymetric maps using data from the WorldView-2 satellite sensor. In this paper, we used well-known semi-analytical equations (Lee et al., 2002) to simulate the remote sensing reflectance of coastal waters at high spectral resolution. The water leaving radiance spectrum was computed and aggregated into the effective in-band radiance for each spectral band of the * Corresponding author. 13 WorldView-2 sensor using the sensor’s relative spectral response functions. The in-band radiance of each spectral band was converted to the effective reflectance. We then performed sensitivity analysis of the effective reflectance of each spectral band with respect to the change in water depth. 2. WORLDVIEW-2 SENSOR The WorldView-2 satellite sensor has 8 multispectral bands at 1.84 meter resolution. The average spectral bandwidth is about 50 nm for the first six bands and about 100 nm for the last two near-infrared bands. The relative spectral response curves of the 8 spectral bands are shown in Figure 1. The wavelengths and bandwidths are listed in Table 1. 3. SHALLOW WATER REMOTE SENSING REFLECTANCE MODEL The remote sensing reflectance just below the water surface is a sum of two components (Lee et al., 1998; Lee et al., 1999), (A) ns) n, QJ -exp(-MKH)]- PE exp(-MKH) (1) TT The first component is due to scattering from the bulk water characterized by the deep water reflectance 5,(A) related to the water absorption and backscattering coefficients, a(X) and bp(A) and two constant parameters gp and g; via the equations (Gordon et al. 1988), KM) =Lg0 + £140)]4(.) , (2) bp(A) A eee 20) a(4.) *- by (X) ©)

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