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:: LOW-COST, ULTRA-HIGH SPATIAL AND TEMPORAL RESOLUTION MAPPING OF INTERTIDAL ROCK PLATFORMS Mitch Bryson, Matthew Johnson-Roberson and Richard Murphy

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 LOW-COST, ULTRA-HIGH SPATIAL AND TEMPORAL RESOLUTION MAPPING OF INTERTIDAL ROCK PLATFORMS Mitch Bryson, Matthew Johnson-Roberson and Richard Murphy Australian Centre for Field Robotics The University of Sydney Sydney, Australia m.bryson@acfr.usyd.edu.au, mattjr@acfr.usyd.edu.au, richard.murphy @sydney.edu.au http://www-personal.acfr.usyd.edu.au/m.bryson KEY WORDS: Photogrammetry, Mapping, High resolution, Three-dimensional, Coast, Ecology ABSTRACT: Intertidal ecosystems have primarily been studied using field-based sampling; remote sensing offers the ability to collect data over large areas in a snapshot of time which could compliment field-based sampling methods by extrapolating them into the wider spatial and temporal context. Conventional remote sensing tools (such as satellite and aircraft imaging) provide data at relatively course, sub-meter resolutions or with limited temporal resolutions and relatively high costs for small-scale environmental science and ecology studies. In this paper, we describe a low-cost, kite-based imaging system and photogrammetric pipeline that was developed for constructing high- resolution, 3D, photo-realistic terrain models of intertidal rocky shores. The processing pipeline uses automatic image feature detection and matching, structure-from-motion and photo-textured terrain surface reconstruction algorithms that require minimal human input and only a small number of ground control points and allow the use of cheap, consumer-grade digital cameras. The resulting maps combine colour and topographic information at sub-centimeter resolutions over an area of approximately 100m, thus enabling spatial properties of the intertidal environment to be determined across a hierarchy of spatial scales. Results of the system are presented for an intertidal rock platform at Cape Banks, Sydney, Australia. Potential uses of this technique include mapping of plant (micro- and macro-algae) and animal (e.g. gastropods) assemblages at multiple spatial and temporal scales. 1 INTRODUCTION Plant and animal assemblages that live in intertidal regions such as rocky shores are part of a complex, dynamic ecosystem, the structure and functioning of which can vary across a cascade of spatial and temporal scales (Underwood, 2000). Intertidal ecosystems have primarily been studied using field-based sam- pling (e.g. (Murphy et al., 2008)) at appropriate resolutions to capture the spatial variability at which assemblages occur. Re- mote sensing is the ideal tool to collect contiguous data over large areas in a snapshot of time. Sensors on satellite and aircraft platforms provide data at relatively coarse spatial (greater than 30cm/pixel) and temporal resolution and this constrains the use- fulness of these data to test ecological models. Conventional re- mote sensing systems do not provide information on topographic variability at small scales (centimeters and meters), which is known to influence the distribution of assemblages of plant and animal species. The high costs of data collection further limit their effec- tiveness in small-scale environmental science and ecology stud- ies. In this paper we develop data collection techniques and data pro- cessing algorithms for constructing ultra-high resolution (sub- centimeter) three-dimensional (3D) maps of intertidal rock plat- forms with a low-cost kite-based mapping system using hundreds of photographs over a broad area. Low-cost platforms such as kites and balloons are an alternative means for collecting data over small areas and have been used for aerial photography, for example in agriculture (Aber et al., 1999, Aber et al., 2002, Arti- gas and Pechmann, 2010), ecology (Guichard et al., 2000), hu- manitarian applications (Sklaver et al., 2006) and archaeology (Verhoeven, 2009) although typically to acquire a single or a small number of photographs. For example, (Guichard et al., 2000) developed a stereo photography rig carried by a helium balloon for collecting stereoscopic image pairs over rocky shores. 243 Our method instead fuses information from hundreds and poten- tially thousands of overlapping monocular images using modern photogrammetry and bundle adjustment techniques (Frahm et al., 2010, Agarwal et al., 2010), allowing for coverage over much larger areas with high-resolution. In this paper, we describe a photogrammetric pipeline that was developed for constructing high-resolution, 3D, photo-realistic terrain models using multiple low-altitude images collected from a consumer-grade digital camera on-board the kite platform. The data processing utilises automatic image feature detection and matching strategies (Vedaldi and Fulkerson, 2008, Beis and Lowe, 2003) that minimise the number of ground control points required during data collection and human-effort required in post-processing. Matched image features were used to estimate the relative pose between cameras and the 3D positions of image features (up-to an unknown scale factor). Image pairs were combined incrementally to form a complete 3D point cloud of the scene and relative cam- era positions (up-to an unknown scale, rotation and translation) using structure-from-motion and bundle adjustment (Snavely et al., 2008). Multi-view stereo reconstruction (Furukawa and Ponce, 2010) was then used to create a dense, 3D pointcloud from which a triangulated surface model was created. Finally, the surface model was photo-textured using a band-limited blending of mul- tiple image patches at each region of the surface and visualised in 3D using a level-of-detail rendering system to capture sub- centimeter details over the entire span of the map. The resulting maps combine colour and topographic information, thus enabling spatial properties of the intertidal environment to be determined across a hierarchy of spatial scales. Potential uses of this tech- nique include mapping of plant (micro- and macro-algae) and an- imal (e.g. gastropods) assemblages at multiple spatial and tem- poral scales. Section 2 describes our approach to kite-based image acquisition and map processing in detail. Results of the technique are demon-

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