The normalized topographic method: An automated procedure for gully mapping using GIS
Gully delineation is a critical aspect of accurately determining soil losses but associated methodologies are rarely detailed. Here, we describe a new gully mapping method, the normalized topographic method (NorToM), based on processing digital elevation model (DEM) data, and we assess associated errors when it is applied over a range of geomorphological scales. The NorToM is underpinned by two gully detection variables (normalized slope and elevation) calculated over local windows of prescribed size, and a group of filtering variables. For four study sites, DEMs of gullies were obtained using field and airborne photo-reconstruction and evaluated using total station and differential global positioning system (dGPS) survey. NorToM provided accurate areal and volume estimates at the individual gully scale but differences increased at the larger gully system and gully network scales. We were able to identify optimal parameters for using the NorToM approach and so confirm that is represents a useful scale-independent means of gully mapping that is likely to be valid in other environments. Its main limitations are that the normalization process might be time-consuming at regional scales and the need for a fixed window size when applied to landforms with extreme variations in dimensions.
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John Wiley & Sons
2014-05-24
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Subjects: | DEM, Photo-reconstruction, Resolution, Mapping, Gully erosion, GIS, |
Online Access: | http://hdl.handle.net/10261/127229 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011011 |
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dig-ias-es-10261-1272292018-01-16T13:31:44Z The normalized topographic method: An automated procedure for gully mapping using GIS Castillo, Carlos Taguas, E. V. Zarco-Tejada, Pablo J. James, Michael R. Gómez Calero, José Alfonso Ministerio de Economía y Competitividad (España) Ministerio de Ciencia e Innovación (España) Junta de Andalucía European Commission DEM Photo-reconstruction Resolution Mapping Gully erosion GIS Gully delineation is a critical aspect of accurately determining soil losses but associated methodologies are rarely detailed. Here, we describe a new gully mapping method, the normalized topographic method (NorToM), based on processing digital elevation model (DEM) data, and we assess associated errors when it is applied over a range of geomorphological scales. The NorToM is underpinned by two gully detection variables (normalized slope and elevation) calculated over local windows of prescribed size, and a group of filtering variables. For four study sites, DEMs of gullies were obtained using field and airborne photo-reconstruction and evaluated using total station and differential global positioning system (dGPS) survey. NorToM provided accurate areal and volume estimates at the individual gully scale but differences increased at the larger gully system and gully network scales. We were able to identify optimal parameters for using the NorToM approach and so confirm that is represents a useful scale-independent means of gully mapping that is likely to be valid in other environments. Its main limitations are that the normalization process might be time-consuming at regional scales and the need for a fixed window size when applied to landforms with extreme variations in dimensions. This study was supported by Projects P08-AGR-03925 (Andalusian Government) and AGL2009-12936-C03-01 (SpanishMinistry of Science and Innovation), AGL2012-40128-C03-01 (SpanishMinistry of Economy and Competitiveness), RESEL (Spanish Ministry forEnvironment and Rural and Marine Affairs) and FEDER funds. Peer Reviewed 2015-12-29T12:04:06Z 2015-12-29T12:04:06Z 2014-05-24 2015-12-29T12:04:09Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1002/esp.3595 issn: 1096-9837 Earth Surface Processes and Landforms 39(15): 2002- 2015 (2014) http://hdl.handle.net/10261/127229 10.1002/esp.3595 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011011 Postprint http://doi.org/10.1002/esp.3595 Sí none John Wiley & Sons |
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DEM Photo-reconstruction Resolution Mapping Gully erosion GIS DEM Photo-reconstruction Resolution Mapping Gully erosion GIS |
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DEM Photo-reconstruction Resolution Mapping Gully erosion GIS DEM Photo-reconstruction Resolution Mapping Gully erosion GIS Castillo, Carlos Taguas, E. V. Zarco-Tejada, Pablo J. James, Michael R. Gómez Calero, José Alfonso The normalized topographic method: An automated procedure for gully mapping using GIS |
description |
Gully delineation is a critical aspect of accurately determining soil losses but associated methodologies are rarely detailed. Here, we describe a new gully mapping method, the normalized topographic method (NorToM), based on processing digital elevation model (DEM) data, and we assess associated errors when it is applied over a range of geomorphological scales. The NorToM is underpinned by two gully detection variables (normalized slope and elevation) calculated over local windows of prescribed size, and a group of filtering variables. For four study sites, DEMs of gullies were obtained using field and airborne photo-reconstruction and evaluated using total station and differential global positioning system (dGPS) survey. NorToM provided accurate areal and volume estimates at the individual gully scale but differences increased at the larger gully system and gully network scales. We were able to identify optimal parameters for using the NorToM approach and so confirm that is represents a useful scale-independent means of gully mapping that is likely to be valid in other environments. Its main limitations are that the normalization process might be time-consuming at regional scales and the need for a fixed window size when applied to landforms with extreme variations in dimensions. |
author2 |
Ministerio de Economía y Competitividad (España) |
author_facet |
Ministerio de Economía y Competitividad (España) Castillo, Carlos Taguas, E. V. Zarco-Tejada, Pablo J. James, Michael R. Gómez Calero, José Alfonso |
format |
artículo |
topic_facet |
DEM Photo-reconstruction Resolution Mapping Gully erosion GIS |
author |
Castillo, Carlos Taguas, E. V. Zarco-Tejada, Pablo J. James, Michael R. Gómez Calero, José Alfonso |
author_sort |
Castillo, Carlos |
title |
The normalized topographic method: An automated procedure for gully mapping using GIS |
title_short |
The normalized topographic method: An automated procedure for gully mapping using GIS |
title_full |
The normalized topographic method: An automated procedure for gully mapping using GIS |
title_fullStr |
The normalized topographic method: An automated procedure for gully mapping using GIS |
title_full_unstemmed |
The normalized topographic method: An automated procedure for gully mapping using GIS |
title_sort |
normalized topographic method: an automated procedure for gully mapping using gis |
publisher |
John Wiley & Sons |
publishDate |
2014-05-24 |
url |
http://hdl.handle.net/10261/127229 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011011 |
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