Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology
Identifieur interne : 001980 ( Istex/Corpus ); précédent : 001979; suivant : 001981Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology
Auteurs : R. Giménez ; I. Marzolff ; M. A. Campo ; M. Seeger ; J. B. Ries ; J. Casalí ; J. Álvarez-MozosSource :
- Earth Surface Processes and Landforms [ 0197-9337 ] ; 2009-11-30.
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- KwdEn :
Abstract
Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm. Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (W/D) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (W/D between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (W/D < 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the W/D ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.
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DOI: 10.1002/esp.1868
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ISTEX:3B998B99FF50C165E803840E01AB802071EE9FC6Le document en format XML
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Marzolff</name><affiliation><mods:affiliation>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</mods:affiliation></affiliation></author><author><name sortKey="Campo, M A" sort="Campo, M A" uniqKey="Campo M" first="M. A." last="Campo">M. A. Campo</name><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation></author><author><name sortKey="Seeger, M" sort="Seeger, M" uniqKey="Seeger M" first="M." last="Seeger">M. Seeger</name><affiliation><mods:affiliation>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</mods:affiliation></affiliation></author><author><name sortKey="Ries, J B" sort="Ries, J B" uniqKey="Ries J" first="J. B." last="Ries">J. B. 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Giménez</name><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation></author><author><name sortKey="Marzolff, I" sort="Marzolff, I" uniqKey="Marzolff I" first="I." last="Marzolff">I. Marzolff</name><affiliation><mods:affiliation>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</mods:affiliation></affiliation></author><author><name sortKey="Campo, M A" sort="Campo, M A" uniqKey="Campo M" first="M. A." last="Campo">M. A. Campo</name><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation></author><author><name sortKey="Seeger, M" sort="Seeger, M" uniqKey="Seeger M" first="M." last="Seeger">M. Seeger</name><affiliation><mods:affiliation>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</mods:affiliation></affiliation></author><author><name sortKey="Ries, J B" sort="Ries, J B" uniqKey="Ries J" first="J. B." last="Ries">J. B. Ries</name><affiliation><mods:affiliation>Department of Physical Geography, University of Trier, Trier, Germany</mods:affiliation></affiliation></author><author><name sortKey="Casali, J" sort="Casali, J" uniqKey="Casali J" first="J." last="Casalí">J. Casalí</name><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation></author><author><name sortKey="Alvarez Ozos, J" sort="Alvarez Ozos, J" uniqKey="Alvarez Ozos J" first="J." last="Álvarez-Mozos">J. Álvarez-Mozos</name><affiliation><mods:affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Earth Surface Processes and Landforms</title><title level="j" type="sub">The Journal of the British Geomorphological Research Group</title><title level="j" type="abbrev">Earth Surf. Process. Landforms</title><idno type="ISSN">0197-9337</idno><idno type="eISSN">1096-9837</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2009-11-30">2009-11-30</date><biblScope unit="volume">34</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="1915">1915</biblScope><biblScope unit="page" to="1926">1926</biblScope></imprint><idno type="ISSN">0197-9337</idno></series><idno type="istex">3B998B99FF50C165E803840E01AB802071EE9FC6</idno><idno type="DOI">10.1002/esp.1868</idno><idno type="ArticleID">ESP1868</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0197-9337</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>gully erosion</term><term>gully morphology</term><term>large scale aerial photograph</term><term>photogrammetry</term><term>sight shadow</term><term>sun shadow</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm. Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (W/D) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (W/D between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (W/D < 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the W/D ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>R. Giménez</name><affiliations><json:string>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</json:string><json:string>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</json:string></affiliations></json:item><json:item><name>I. Marzolff</name><affiliations><json:string>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</json:string></affiliations></json:item><json:item><name>M. A. Campo</name><affiliations><json:string>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</json:string></affiliations></json:item><json:item><name>M. Seeger</name><affiliations><json:string>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</json:string></affiliations></json:item><json:item><name>J. B. Ries</name><affiliations><json:string>Department of Physical Geography, University of Trier, Trier, Germany</json:string></affiliations></json:item><json:item><name>J. Casalí</name><affiliations><json:string>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</json:string></affiliations></json:item><json:item><name>J. Álvarez‐Mozos</name><affiliations><json:string>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>gully erosion</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>gully morphology</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>photogrammetry</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>large scale aerial photograph</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sun shadow</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sight shadow</value></json:item></subject><articleId><json:string>ESP1868</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm. Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (W/D) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (W/D between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (W/D > 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the W/D ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.</abstract><qualityIndicators><score>8</score><pdfVersion>1.3</pdfVersion><pdfPageSize>595 x 842 pts (A4)</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>2072</abstractCharCount><pdfWordCount>6096</pdfWordCount><pdfCharCount>39157</pdfCharCount><pdfPageCount>12</pdfPageCount><abstractWordCount>307</abstractWordCount></qualityIndicators><title>Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology</title><refBibs><json:item><host><author></author><title>Álvarez‐Mozos J. 2006. 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Vrieling</name></json:item></author><host><volume>65</volume><pages><last>18</last><first>2</first></pages><author></author><title>Catena</title></host><title>Satellite remote sensing for water erosion assessment: a review</title></json:item></refBibs><genre><json:string>article</json:string></genre><host><volume>34</volume><publisherId><json:string>ESP</json:string></publisherId><pages><total>12</total><last>1926</last><first>1915</first></pages><issn><json:string>0197-9337</json:string></issn><issue>14</issue><subject><json:item><value>Research Article</value></json:item></subject><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1096-9837</json:string></eissn><title>Earth Surface Processes and Landforms</title><doi><json:string>10.1002/(ISSN)1096-9837</json:string></doi></host><categories><wos><json:string>science</json:string><json:string>geosciences, multidisciplinary</json:string><json:string>geography, physical</json:string></wos><scienceMetrix><json:string>economic & social sciences</json:string><json:string>social sciences</json:string><json:string>geography</json:string></scienceMetrix></categories><publicationDate>2009</publicationDate><copyrightDate>2009</copyrightDate><doi><json:string>10.1002/esp.1868</json:string></doi><id>3B998B99FF50C165E803840E01AB802071EE9FC6</id><score>0.92872024</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/3B998B99FF50C165E803840E01AB802071EE9FC6/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/3B998B99FF50C165E803840E01AB802071EE9FC6/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/3B998B99FF50C165E803840E01AB802071EE9FC6/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><availability><p>Copyright © 2009 John Wiley & Sons, Ltd.</p></availability><date>2009</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology</title><author xml:id="author-1"><persName><forename type="first">R.</forename><surname>Giménez</surname></persName><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation></author><author xml:id="author-2"><persName><forename type="first">I.</forename><surname>Marzolff</surname></persName><affiliation>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</affiliation></author><author xml:id="author-3"><persName><forename type="first">M. A.</forename><surname>Campo</surname></persName><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation></author><author xml:id="author-4"><persName><forename type="first">M.</forename><surname>Seeger</surname></persName><affiliation>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</affiliation></author><author xml:id="author-5"><persName><forename type="first">J. B.</forename><surname>Ries</surname></persName><affiliation>Department of Physical Geography, University of Trier, Trier, Germany</affiliation></author><author xml:id="author-6"><persName><forename type="first">J.</forename><surname>Casalí</surname></persName><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation></author><author xml:id="author-7"><persName><forename type="first">J.</forename><surname>Álvarez‐Mozos</surname></persName><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation></author></analytic><monogr><title level="j">Earth Surface Processes and Landforms</title><title level="j" type="sub">The Journal of the British Geomorphological Research Group</title><title level="j" type="abbrev">Earth Surf. Process. Landforms</title><idno type="pISSN">0197-9337</idno><idno type="eISSN">1096-9837</idno><idno type="DOI">10.1002/(ISSN)1096-9837</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2009-11-30"></date><biblScope unit="volume">34</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="1915">1915</biblScope><biblScope unit="page" to="1926">1926</biblScope></imprint></monogr><idno type="istex">3B998B99FF50C165E803840E01AB802071EE9FC6</idno><idno type="DOI">10.1002/esp.1868</idno><idno type="ArticleID">ESP1868</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2009</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm. Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (W/D) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (W/D between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (W/D < 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the W/D ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>gully erosion</term></item><item><term>gully morphology</term></item><item><term>photogrammetry</term></item><item><term>large scale aerial photograph</term></item><item><term>sun shadow</term></item><item><term>sight shadow</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>article-category</head><item><term>Research Article</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2009-05-28">Received</change><change when="2009-06-09">Registration</change><change when="2009-11-30">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/3B998B99FF50C165E803840E01AB802071EE9FC6/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>John Wiley & Sons, Ltd.</publisherName><publisherLoc>Chichester, UK</publisherLoc></publisherInfo><doi registered="yes">10.1002/(ISSN)1096-9837</doi><issn type="print">0197-9337</issn><issn type="electronic">1096-9837</issn><idGroup><id type="product" value="ESP"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="EARTH SURFACE PROCESSES AND LANDFORMS">Earth Surface Processes and Landforms</title><title type="subtitle">The Journal of the British Geomorphological Research Group</title><title type="short">Earth Surf. 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A.</givenNames><familyName>Campo</familyName></personName></creator><creator xml:id="au4" creatorRole="author" affiliationRef="#af3"><personName><givenNames>M.</givenNames><familyName>Seeger</familyName></personName></creator><creator xml:id="au5" creatorRole="author" affiliationRef="#af4"><personName><givenNames>J. B.</givenNames><familyName>Ries</familyName></personName></creator><creator xml:id="au6" creatorRole="author" affiliationRef="#af1"><personName><givenNames>J.</givenNames><familyName>Casalí</familyName></personName></creator><creator xml:id="au7" creatorRole="author" affiliationRef="#af1"><personName><givenNames>J.</givenNames><familyName>Álvarez‐Mozos</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="af1" countryCode="ES" type="organization"><unparsedAffiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</unparsedAffiliation></affiliation><affiliation xml:id="af2" countryCode="DE" type="organization"><unparsedAffiliation>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</unparsedAffiliation></affiliation><affiliation xml:id="af3" countryCode="NL" type="organization"><unparsedAffiliation>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</unparsedAffiliation></affiliation><affiliation xml:id="af4" countryCode="DE" type="organization"><unparsedAffiliation>Department of Physical Geography, University of Trier, Trier, Germany</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en" type="author"><keyword xml:id="kwd1">gully erosion</keyword><keyword xml:id="kwd2">gully morphology</keyword><keyword xml:id="kwd3">photogrammetry</keyword><keyword xml:id="kwd4">large scale aerial photograph</keyword><keyword xml:id="kwd5">sun shadow</keyword><keyword xml:id="kwd6">sight shadow</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm.</p><p>Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (<i>W</i>/<i>D</i>) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (<i>W</i>/<i>D</i> between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (<i>W</i>/<i>D</i> < 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the <i>W</i>/<i>D</i> ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>ACCURACY OF HIGH‐RESOLUTION PHOTOGRAMMETRIC MEASUREMENTS OF GULLIES</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Accuracy of high‐resolution photogrammetric measurements of gullies with contrasting morphology</title></titleInfo><name type="personal"><namePart type="given">R.</namePart><namePart type="family">Giménez</namePart><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">I.</namePart><namePart type="family">Marzolff</namePart><affiliation>Department of Physical Geography, Johann Wolfgang Goethe University, Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M. A.</namePart><namePart type="family">Campo</namePart><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Seeger</namePart><affiliation>Department of Land Degradation and Development, Wageningen University & Research Center, Wageningen, The Netherlands</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. B.</namePart><namePart type="family">Ries</namePart><affiliation>Department of Physical Geography, University of Trier, Trier, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Casalí</namePart><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Álvarez‐Mozos</namePart><affiliation>Department of Projects and Rural Engineering, Public University of Navarre, Pamplona, Spain</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2009-11-30</dateIssued><dateCaptured encoding="w3cdtf">2009-05-28</dateCaptured><dateValid encoding="w3cdtf">2009-06-09</dateValid><copyrightDate encoding="w3cdtf">2009</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">10</extent><extent unit="tables">2</extent><extent unit="references">27</extent></physicalDescription><abstract lang="en">Field techniques allow accurate direct measurements on gully geometry, even in three‐dimensional (3D) coordinates. Accuracy and detail reproduction is limited mainly by experimental setup and density of measurements, and less so by the precision of the measuring equipment. In contrast, remote‐sensing techniques permit the coverage of large study areas with a minimum of time and effort. However, the indirect measurements from imagery are known to depend on factors like image resolution, quality of ground control, vegetation cover and image evaluation technique, which strongly influence the measurement accuracy. The objective of the present study was to investigate to what extent the accuracy of 3D gully measurement using photogrammetric techniques depends on gully morphology. At a study site in the Bardenas Reales (Navarre, Spain), field measurements of cross‐sections were taken for five gullies with contrasting morphology and dimensions and used as reference data for analysing the errors associated with a corresponding dataset obtained using small‐format aerial photogrammetry whose pixel size on the ground is 16 mm. Results show that volumetric gully measurements by means of photogrammetric techniques are strongly affected by the gully morphology; in particular by its width/depth (W/D) ratio, because of the increasing sun‐shadowing and sight‐shadowing effects associated with narrower gullies. Only wide, shallow gullies are little affected by this problem. For gullies of an intermediate typology (W/D between 0·5 and 2·5), the accuracy of photogrammetric measurements will much depend on the time of day and the period of the year when the photographs are taken, and narrow/deep gullies (W/D < 0·5) will be likely to be highly inaccurate at any time. Although this study was conducted with a large measurement scale for small (mostly ephemeral) gullies, the W/D ratios judged challenging for photogrammetric analysis in this study are also common for larger‐sized gullies of the (permanent) bank gully type. Copyright © 2009 John Wiley & Sons, Ltd.</abstract><subject lang="en"><genre>keywords</genre><topic>gully erosion</topic><topic>gully morphology</topic><topic>photogrammetry</topic><topic>large scale aerial photograph</topic><topic>sun shadow</topic><topic>sight shadow</topic></subject><relatedItem type="host"><titleInfo><title>Earth Surface Processes and Landforms</title><subTitle>The Journal of the British Geomorphological Research Group</subTitle></titleInfo><titleInfo type="abbreviated"><title>Earth Surf. Process. Landforms</title></titleInfo><genre type="journal">journal</genre><subject><genre>article-category</genre><topic>Research Article</topic></subject><identifier type="ISSN">0197-9337</identifier><identifier type="eISSN">1096-9837</identifier><identifier type="DOI">10.1002/(ISSN)1096-9837</identifier><identifier type="PublisherID">ESP</identifier><part><date>2009</date><detail type="title"><title>Gully Erosion Processes: Monitoring and Modelling</title></detail><detail type="volume"><caption>vol.</caption><number>34</number></detail><detail type="issue"><caption>no.</caption><number>14</number></detail><extent unit="pages"><start>1915</start><end>1926</end><total>12</total></extent></part></relatedItem><identifier type="istex">3B998B99FF50C165E803840E01AB802071EE9FC6</identifier><identifier type="DOI">10.1002/esp.1868</identifier><identifier type="ArticleID">ESP1868</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright © 2009 John Wiley & Sons, Ltd.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>John Wiley & Sons, Ltd.</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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