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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Bibliographic Details
Main Authors: Castillo, Carlos, Taguas, E. V., Zarco-Tejada, Pablo J., James, Michael R., Gómez Calero, José Alfonso
Other Authors: Ministerio de Economía y Competitividad (España)
Format: artículo biblioteca
Published: John Wiley & Sons 2014-05-24
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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spelling 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
institution IAS ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-ias-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IAS España
topic DEM
Photo-reconstruction
Resolution
Mapping
Gully erosion
GIS
DEM
Photo-reconstruction
Resolution
Mapping
Gully erosion
GIS
spellingShingle 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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