XXII ISPRS Congress 2012: Technical Commission VII

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:: 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/2: SAR INTERFEROMETRY]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: AIRBORNE X-HH INCIDENCE ANGLE IMPACT ON CANOPY HEIGHT RETREIVAL: IMPLICATIONS FOR SPACEBORNE X-HH TANDEM-X GLOBAL CANOPY HEIGHT MODEL M. Lorraine Tighe, Doug King, Heiko Balzter, Abderrazak Bannari, Heather McNairn

Document type:: Multivolume work

Structure type:: Chapter

and its nt and uld be ed and e SAR he sea zestion nission ct data ver the with a eds to ations. y role. | by C- bands w and fferent dicular aseline ents of motion main is for 'nerate j, even cessful among hnique y and data, 1 SAR qo ). pp. es and Sons, aves, COPE (12 ne, Water -insar- ze W., y a“ oy the 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 AIRBORNE X-HH INCIDENCE ANGLE IMPACT ON CANOPY HEIGHT RETREIVAL: IMPLICATIONS FOR SPACEBORNE X-HH TANDEM-X GLOBAL CANOPY HEIGHT MODEL M. Lorraine Tighe“”, Doug King”, Heiko Balzter‘’, Abderrazak Bannari”, Heather McNairn® @ Intermap Technologies, Inc., 8310 South Valley Highway, Suite 400, Englewood, CO, 80112-5809 USA ® Carleton University, Dept. of Geography and Environmental Studies, 1125 Colonel By Dr. Ottawa, Ontario K1S 5B6, Canada © University of Leicester, Centre for Landscape and Climate Research, Department of Geography, Leicester LE1 7RH, UK « Department of Geography, University of Ottawa, 60 University, Simard 029, Ottawa, ON, Canada KIN 6N5 © Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa Ontario, K1A 0C6 Canada Commission VII WG2: SAR Interferometry KEY WORDS: Canopy Height, InSAR, X-band, DTM, DSM, DEM ABSTRACT: To support international climate change mitigation efforts, the United Nations REDD+ initiative (Reducing Emissions from Deforestation and Degradation) seeks to reduce land use induced greenhouse gas emissions to the atmosphere. It requires independent monitoring of forest cover and forest biomass information in a spatially explicit form. It is widely recognised that remote sensing is required to deliver this information. Synthetic Aperture Radar interferometry (InSAR) techniques have gained traction in the last decade as a viable technology from which vegetation canopy height and bare earth elevations can be derived. The viewing geometry of a SAR sensor is side-looking where the radar pulse is transmitted out to one side of the aircraft or satellite, defining an incidence angle (0) range. The incidence angle will change from near-range (NR) to far-range (FR) across of the track of the SAR platform. InSAR uses image pairs and thus, contain two set of incidence angles. Changes in the InSAR incidence angles can alter the relative contributions from the vegetation canopy and the ground surface and thus, affect the retrieved vegetation canopy height. Incidence angle change is less pronounced in spaceborne data than in airborne data and mitigated somewhat when multiple InSAR-data takes are combined. This study uses NEXTMap® single- and multi-pass X-band HH polarized InSAR to derive vegetation canopy height from the scattering phase centre height (h,,.). Comparisons with in situ vegetation canopy height over three test sites (Arizona-1, Minnesota-2); the effect of incidence angle changes across swath on the X-HH InSAR h,,, was examined. Results indicate at steep incidence angles (6 = 35), more exposure of lower vegetation canopy structure (e.g. tree trunks) led to greater lower canopy double bounce, increased ground scattering, and decreased volume scattering. This resulted in a lower scattering phase centre height (h,,.) or a greater underestimation of vegetation canopy height given by the single-pass X-HH InSAR data. The opposite effect occurs in the far range (0 = 55 ), an increase in volume scattering resulted in more accurate vegetation canopy heights when compared to in situ measurements. These findings indicate that incidence angle corrections should be applied to airborne X-HH single-pass InSAR. In contrast, NEXTMap X-HH (multi-pass data) h,,. data experienced little or no effect of incidence angle, possibly because NEXTMap is an aggregation of multi-pass flight line strips, which averages data over several incidence angles. These results may aid in the understanding of potential incidence angle effects in Astrium spaceborne Tandem-X data, which will have global digital surface elevation coverage by 2015. 1. INTRODUCTION interferometric Synthetic Aperture Radar (cited as IFSAR or InSAR in the literature) exhibit frequency-dependent sensitivity Mapped estimates of vegetation canopy height of forests are relevant to understanding carbon storage and cycling, susceptibility to wildfire, changes in vegetation structure from disturbance (e.g. insect outbreaks, wildfire, storms, forest management practices such as thinning and logging), and assessment of biodiversity and wildlife habitat. Furthermore, vegetation canopy height is useful in obtaining more accurate estimates of aboveground woody biomass and is a key indicator of succession status (Balzter et al. 2007a). Knowledge of vegetation canopy structure is required for modelling processes such as photosynthesis, energy transfer, evapotranspiration, and climate change at both local and global scales. Furthermore, vegetation canopy height is of great value in many types of regional- to global-scale modelling and is an essential precursor to many techniques for extracting physical, topographic, and cultural data for a plethora of applications. Examples of applications include floodplain modelling, geological hazard assessment, landslide analysis, urban planning, topographic and geologic mapping, biomass studies, and land-fire initiatives, amongst others. Digital surface models (DSMs) derived from to the height of vegetation canopy elements (e.g. leaves, twigs, branches, and tree trunks), and a number of investigators have had success in retrieving estimates of canopy height from interferometric measurements (Treuhaft and Siqueira, 2000; Kellndorfer et al., 2004; Balzter et al., 2007a; 2007b; Walker et al., 2007; Sexton et al., 2009). Methods to estimate vegetation canopy height from InSAR techniques vary. One approach, applied in this study, is to subtract an independent elevation measurement of the bare ground surface (e.g. digital terrain model — DTM) from the interferometric surface height (e.g. digital surface model — DSM) to estimate the scattering phase centre height (h,,.; Kellndorfer et al., 2004; Simard et al., 2006; Andersen et al., 2008) to yield an estimate of vegetation canopy height. While a significant amount of research has been published on the application of InSAR for vegetation parameter extraction—in particular for vegetation canopy height— additional research is needed to gain further understanding of the effect of incidence angle changes on InSAR derived vegetation canopy height given by h,, and methods must be

Access restriction

Copyright

fullscreen: Technical Commission VII (B7)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation