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

ured kton s of 1sed rater 440 m), g to 9) ctral ctral ctral 10) per nm lark tted ince the hest and loes Yold 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 The derivative of the in-band reflectance R; with respect to water depth (Figure 4) can be used as an indicator of the depth sensitivity of each spectral band. Figure 4 indicates that the Green band (Band 3) has the highest depth sensitivity for the typical turbid coastal water with a dark seabed. For this type of sea water, the peak reflectance is about 0.04 sr. Suppose that the noise level is one percent of the peak value, and that a depth resolution of 0.25 m is desired, then the depth derivative of reflectance must have a value greater than about 0.0016 sr’! m! in order. Figure 4 shows that the Green Band meets this requirement for water depth up to 5.3 m. The Green Band is the most penetrative and the depth sensitivity (and hence the penetration depth) decreases towards the blue end of the spectrum as the absorption coefficient is high in this part of the spectrum due to absorption by CDOM. The depth sensitivity also decreases towards the red end of the spectrum due to the high absorption by water itself. 0.04 4 0.035 3 0.03 3 0.025 À 0.02 3 0.015 3 0.01 À 0.005 3 Oll cu E 400 600 800 1000 Wavelength (nm) Ris (sr) Figure 2. A typical reflectance spectrum of coastal sea water with a bright sandy bottom and 2 m water depth. The solid blue line is the computed spectrum while the red dots are the in-band effective reflectance of WorldView-2 plotted at their respective effective wavelengths. 0.045 -: 0.04 - rem 0.035 - 003 . 0.025 - 0.02 - 0.015 - 0.01 0.005 Reflectance (sr?) Water Depth (m) Figure 3. Variation of reflectance with water depth for the first 6 spectral bands of WorldView-2 for coastal sea water with a dark seabed. 0.02 E i. $4 | 0015 A 4 :; à $ on Bi s 5 "^2 i9 Eu SUMI OHI- EREQUUI ONSE ae B3 a © 005. 53 8 | ci Mee e des > 9 0 — B6 = c 2 -0.005 reprenne dns 0 2 4 6 8 10 Water Depth (m). Figure 4. Derivative of reflectance with respect to water depth for the first 6 spectral bands of WorldView-2 for coastal sea water with a dark seabed. 0.002 -0.002 E 5 o E = s = -0004 : o à i 9 i $ -0.006 © : 5 i = -0.008 u i = 1 i f -0.01 Eh cá i ; ed 0 2 4 6 8 10 Water Depth (m) Figure 5. Derivative of reflectance with respect to water depth for the first 6 spectral bands of WorldView-2 for coastal sea water with a bright sandy seabed. Figure 5 shows the depth derivative of reflectance for the typical sea water with a bright sandy seabed. The derivative mostly has negative values because now the reflectance generally decreases with increasing water depth. The depth sensitivity of each spectral band is indicated by the absolute value of the derivative. For coastal sea water with a bright sandy sea bed, the Red and Yellow bands have the best depth sensitivity. They are capable of probing water depth up to 2.4 m. All other bands are not sensitive to a change in water depth beyond about | m. Table 2 lists the maximum depth for each spectral band where the absolute value of the depth derivative of reflectance exceeds the threshold value of 0.0016 sr! m'!. Bad Band Name NN MT ! dark seabed bright seabed 1 “Coastal” 1.8 1:3 2 Blue 3.6 1.1 3 Green 5:3 0.8 4 Yellow 3.0 2.3 5 Red 2.0 244 6 “Red Edge” 0.6 1.4 Table 2. Maximum depth where the absolute value of depth derivative of reflectance exceeds 0.0016 sr" m™ for the first six spectral bands of WorldView-2, for typical coastal sea waters with dark and bright seabed.

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