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:: SUBDIVISION OF PANTANAL QUATERNARY WETLANDS: MODIS NDVI TIME-SERIES IN THE INDIRECT DETECTION OF SEDIMENTS GRANULOMETRY N. C. Penatti & T. I. R. de Almeida

Document type:: Multivolume work

Structure type:: Chapter

z Stenhouse, G. er heterogeneity dian Journal of n, W., Hall, F,, rest disturbance note Sensing of 'olfe, R., Hall, F. Landsat surface 90—2000. IEEE 72. lysis in Sakarya GIS, Msc. ITU ects of irrigation ion, Geography . and Demir, H., and water use in Implications for an. 20: 467-488. ). The effect of r the status of , 61, 210-220. 5 S, Kumar, V., ents in terrestrial ata sets. Global jg X. Tu 1, €& ie change in the ional Journal of nney, M. P, & change detection rect atmospheric 0—244. nce study. GAP o. 15 (Revised). t Venture. Tokyo "Water Projects" gy , Stockholm, R. Larson, B. K. jn of the 1990's erminous United ., 67, 650-662. isek, J. G., Irons, nuity: Issues and mote Sensing of 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 SUBDIVISION OF PANTANAL QUATERNARY WETLANDS: MODIS NDVI TIME- SERIES IN THE INDIRECT DETECTION OF SEDIMENTS GRANULOMETRY N. C. Penatti *' & T. I. R. de Almeida * ? Institute of Geoscience, University of Sáo Paulo, Rua do Lago, 562 - Sáo Paulo - Brasil (natasha.penatti, talmeida)@usp.br Commission VIII, WG VIII/6 KEY WORDS: Vegetation, MODIS, Geology, Comparison, Environment, Multitemporal, TIMESAT ABSTRACT: The Pantanal is the world's largest wetland presenting a variety of ecological sub-regions. The region is characterized by seasonal floods followed by long droughts. At this period, some areas rapidly dry, while others remain soaked. The study hypothesis was based on the statement that this phenomenon cannot be totally explained by small relief variations but by the sediment granulometry: the pelitic sediments allow the soil to retain moisture longer, implying that the vegetation has greater possibilities of continuing photosynthetically active even during the drought. It was developed based on the spectral behaviour of MODIS products, validated by previous fieldwork. Using MODIS, we studied a large scale patterns in spatial and seasonal dynamics of the vegetation in different regions of Pantanal. So, two indirect parameters of the local physical environment — sediment granulometry and water availability — potentially can be estimated. We calculated the NDVI from MODO9GQ for rainy and dry seasons, generating triplets (NDVI/NIR and Red bands) that allowed to identify vegetation changes in those periods. The 16-days composites of NDVI (MOD13Q1) were used to generate a 5-year time-series for pixels associated with 161 locals sampled for granulometric analyses. The samples were taken in 10 different areas from the 20 geological and environmentally homologous areas delimited in this research. The clear tendency in the time-series confirms the working hypothesis, indicating that there is a high relationship between drought-related changes in vegetation extracted from NDVI and sediment texture, parameter that plays an important role in soil moisture, influencing the vegetation response to droughts. 1. INTRODUCTION The Pantanal is a vast wetland predominantly covered by savannas and, more locally, by forests. It is located in a tropical region at the center of South America over a sedimentary basin. This basin, originated at the end of Tertiary, is yet tectonically active, due to efforts between the tectonic plates of South America and Nazca (Assumpgdo, 1998). Nested in the Upper Paraguay River basin, the floodplain is located mostly in Brazil with smaller areas in Bolivia and Paraguay. Pantanal is a complex wetland characterized by seasonal floods with varied intensities, and markedly wet and dry phases, with geomorphic features derived from the present conditions and others inherited from successive Pleistocene and Holocene climate changes. This landscape has enormous internal variability due largely to the geological environment: the nature of the sediments, small relief variations associated with the sedimentary or erosional processes and neotectonics. The large size of this feature and the access difficulties makes the remote sensing an indispensable tool. To detect phenological changes, the remote sensing community has relied on vegetation indices, usually derived from the Advanced Very High Resolution Radiometer (AVHRR) or the Moderate Resolution Imaging Spectroradiometer (MODIS) as these sensors have the advantages of greater image acquisition frequency and larger areal coverage (Redo and Millington, 2011). MODIS products are particularly suitable to study Pantanal because they can cover the entire wetland in a single orbit, providing a synoptic view of this dynamic region. From these data it is possible to extract products of vegetation indices which enhance the spectral response of plants, reducing the influence of soil, aiming to distinguish the vegetation phenology and changes in land use/land cover at the analysis of a temporal image series (Wardlow et al., 2007). Currently, satellite derived vegetation index data, such as Normalized Difference Vegetation Index (NDVI), plays an important role for vegetation drought response and flood monitoring (Kogan, 1998; McVicar and Jupp 1998, Ji and Peters 2003, Gu et al., 2008, Caccamo et al., 2011). The indices are useful for detection and monitoring large area vegetation stress resulted from drought or soil oversaturation following flooding and excessive rains. In dynamic areas, such Pantanal, annual cycle of floods and droughts, changes the landscape completely, creating different inside areas based on physical environmental characteristics. Between November and March, rains saturate the area; rivers overflow and flood the lowland forest and grassland areas, turning the plains into an immense freshwater wetland. From April onwards though, the waters start to recede, and by October, water can only be found in low- lying ponds and rivers. Although, drought effects in vegetation have a tendency to be more persistent in some areas than in others. The study hypothesis was based on the statement that this phenomenon cannot be totally explained by the small relief variations in Pantanal but by the sediment granulometries. In this context, the main objective of this study was to understand how MODIS-based NDVI correlates to sediments granulometry over the seasons and along a five year NDVI time-series in Pantanal. The knowledge of the velocity and intensity of NDVI values decrease at the sampled areas will enable the establishment of granulometric patterns for regions not visited during the fieldwork. This will provide an unpublished and essential indicative granulometric spatial data, that can allow the proposal of a subdivision of the Pantanal in geological and environmental homologous sub-areas.

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