XXII ISPRS Congress 2012: Technical Commission VIII

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

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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:: 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/4: Water]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Using MODIS Normalized Difference Vegetation Index to monitor seasonal and inter-annual dynamics of wetland vegetation in the Great Artesian Basin: a baseline for assessment of future changes in a unique ecosystem Caroline Petus, Megan Lewis and Davina White

Document type:: Multivolume work

Structure type:: Chapter

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 Using MODIS Normalized Difference Vegetation Index to monitor seasonal and inter-annual dynamics of wetland vegetation in the Great Artesian Basin: a baseline for assessment of future changes in a unique ecosystem Caroline Petus', Megan Lewis and Davina White School of Earth and Environmental Sciences, The University of Adelaide, Adelaide 5005, Australia - caroline.petus( gmail.com, (megan.lewis, davina.white)(gadelaide.edu.au KEY WORDS: Environment, Vegetation, Mapping, Monitoring, Analysis, Satellite, Change ABSTRACT: The Great Artesian Basin mound springs (Australia) are unique wetland ecosystems of great significance. However, these unique ecosystems are endangered by anthropogenic water extraction. Relationships have been established between the vegetated wetland area and the discharge associated with individual springs, providing a potential means of monitoring groundwater flow using measurements of wetland area. Previous studies using this relationship to monitor Great Artesian Basin springs have used aerial photography or high resolution satellite images, giving sporadic temporal information. These "snapshot" studies need to be placed within a longer and more regular context to better assess changes in response to aquifer draw-downs. In this study, the potential of medium resolution MODIS Normalized Difference Vegetation Index data for studying the long-term and high frequency temporal dynamics of wetland vegetation at the Dalhousie Spring Complex of the GAB is tested. Photosynthetic activity within Dalhousie wetlands could be differentiated from surrounding land responses. The study showed good correlation between wetland vegetated area and groundwater flow, but also the important influence of natural species phenologies, rainfall, and human activity on the observed seasonal and inter-annual vegetation dynamic. Declining trends in the extent of wetland areas were observed over the 2000- 2009 period followed by a return of wetland vegetation since 2010. This study underlined the need to continue long-term medium resolution satellite studies of the Great Artesian Basin as these data provide a good understanding of variability within the wetlands, give temporal context for less frequent studies and a strong baseline for assessment of future changes. 1. INTRODUCTION The Great Artesian Basin (GAB) of Australia is one of the largest groundwater resources in the world (Ponder, 2002), underlying about one fifth of the Australian continent (Figure la). Groundwater from the GAB supports a series of mound spring which contain a number of rare and relic endemic flora and fauna (Fensham and Fairfax 2003; Gotch et al, 2008; Ponder, 2002). The GAB springs are of great national and international importance for their ecological, scientific and economic values, and are culturally significant to indigenous Australians. In the recent decade, the sustainability of these groundwater-dependent ecosystems has become uncertain and numerous cases of spring extinction have been observed. In the near future, demands for this precious groundwater resource are likely to be considerable, particularly from proposed mining and petroleum activities, (Fensham et al., 2010; Mudd, 1998). It is thus particularly important to develop reliable methods for monitoring the long term artesian flow to inform management of the GAB and better protect this sensitive environment and its ecosystems. Direct measurements of spring flow are notoriously difficult and expensive if precise estimates are required (Niejalke and Lamb, 2001). Relationships have been established between the wetland area associated with individual springs and their discharge (L.s’ ), providing a potential means of monitoring groundwater flow using measurements of vegetated wetland area (Fatchen, 2001; Fatchen and Fatchen, 1993; White and Lewis, 2011; Williams and Holmes, 1978). Previous studies using this relationship to monitor Great Artesian Basin springs have used sporadic aerial * Corresponding author photography or high resolution satellite images calibrated to Normalized Difference Vegetation Index (NDVI) (Niejalke and Lamb, 2001, White and Lewis, 2011). These intermittent high resolution studies have only given "snapshots" of vegetated wetland area dynamics at selected springs in the DSC. They need to be placed within a longer and more regular context to better assess changes in response to aquifer draw-downs (White and Lewis, 2011). Since the launch of the MODIS satellite in 1998, medium resolution (250-m) MODIS NDVI time-series data have been applied successfully to quantify vegetation activity and to monitor vegetation dynamics (e.g. Jacquin et al., 2010; Jónsson et al., 2010) at high temporal frequency (16 days composites). In this study, 8 to 10 years of MODIS NDVI images were used to monitor and quantify vegetation activity and dynamics of the Dalhousie Spring Complex wetlands located on the southwest margin of the Great Artesian Basin (Figure la and b). DSC is the most important spring complex in the GAB and discharges 90% of total spring flow in South Australia through 148 separate spring vents (Gotch, 2010). Recent field work (March 2009) increased knowledge about wetland vegetation associated with active Dalhousie springs (White and Lewis, 2010a, b). The dominant vegetation comprises reeds and sedges or tall reeds dominated by Phragmites australis (Common Reed) and open- forest, woodland and open woodland dominated by Melaleuca glomerata (White Tea-tree) trees 10-12 m tall. Ephemeral vegetation in spring tails mainly comprises mixed sedgelands including Cyperus spp. and Juncus sp.

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