Proceedings of the IMProVe 2011 International conference on Innovative Methods in Product Design June 15 th – 17 th , 2011, Venice, Italy

Landform of province by using GIS

Ana Pou Merina (a) , Cruz Calleja Perucho (a), Maria Angeles Ruiz (b), Ignacio Cañas Guerrero (a) (a) Polytechnic University of Madrid (b) Rey Juan Carlos University of Madrid

Article Information Abstract

Keywords: Purpose: GIS It is proposed a methodology to get landform of an area by using GIS techniques and a Landscape verification afterwards by photographs taken from several highways and motorways. Landform Highways Method: Within the catalog of geographic features that serve to define a specific landscape of an area, this paper proposes the study of the landform. It is about mapping by using Geographic Corresponding author: Information Systems, specifically the ArcGIS 9.3 (ArcMap and ArcCatalog). To do this, it is necessary to use both raster and feature formats. Ana Pou Merina Tel.: 0034913665767 The methodology using of various coverage of the Alicante province, extending from the 0034667408993 contour, vertices surveying, dimensional points, administrative boundaries of the province to e-mail: [email protected] rivers and reservoirs. All this information has been provided by the National Center for Address: Avd. Complutense s/n Geographic Information. In this manner, we obtain a Digital Terrain Model corrected Madrid 28040 () hydrogeologically to 1:25000. Starting off of this digital terrain model - which has been calculated through the actions explained above- we used several tools of ArcGIS 9.3, including: neighborhood focal statistcs, reclassify, slope, clip, intersect, dissolve, etc. in order to calculate relative relief, slope and neighbourhood analysis radius. With these parameters we obtain a Landform Classification of Alicante province (Spain). Afterward, we contrast the landform result with a pictures taking from several highways and motorways in Alicante in order to identify if this classification is correspond with the reality. Result: As a result, we obtain an Automatic Landform Classification of Alicante in 1:25000, and properly methodology to do this delimitation because it has been contracted with the real landform by pictures. Discussion & Conclusion: After the verification with the reality, the result map is be able to extrapolate the methodology applied to others places with similar or different superficies and also with another type of topography. It is only necessary to adapt some parameters depending of the project scale.

To study the landform through the photos, it is 1 Introduction necessary to select which are representatives of the relief.

It is well known to use Geographic Information Systems to study different environment areas, such as landform. Currently, there are several publications concerning this 2 Materials and Method topic, some of those considered most relevant are [1-8]. Although some GIS applications can get a very realist 2.1 Material landform, this paper presents a mixed study by As indicated in the abstract, for carry out this work is geographic information systems and knowledge of the started from several coverages: contours, vertices real relief. In order to have enough documentation from surveying, dimensional points, administrative boundaries, real orography, we have taken photographs along various rivers and reservoirs and orthophotos, which are obtained roads. from download center of National Center for Geographic To carry out this proposal, we performed a practical study Information. These layers are used as a tool for in the province of Alicante (Spain), taking the highways Geographic Information Systems, specially the ArcGIS 9.3 and motorways in this province such as observation areas program, working in both raster and feature systems, by which belong to Abertis and Iridium companies that using several applications, such as: neighbourhood, participate in OASIS project. These line infrastructures intersect, clip, dissolve, etc. in order to obtain a landform are distributed throughout the province, so that both the classification map of the province. coast and the interior have been photographed, and inventorying a variety of relief, from plains at sea level to Afterwards this office phase, we have made several mountains in the interior. field trips in order to have photographic documentation of

875 A. P. Merina et al. Landform of Alicante province by using GIS

various areas of the province, with the purpose of and the index profile is studied elevations from an area to verifying the resulting coverage with the reality. For this surrounding areas. reason, we took panoramic photographs of 360º from some highways and motorway. At the same time than taking pictures from the car, we took position data using a GPS to georeference all the pictures and place them in the GIS.

2.2 Methodology The methodology applied is started with several features coverages: the contour, the vertices surveying, the dimensional points and the administrative boundaries to a 1:25.000 scale, while rivers, reservoirs and roads were vectorially digitized a smaller scale from the orthophotos to avoid errors in this process. All these coverages are used to obtain Digital Terrain Model (DTM) corrected hydrogeologically, in order to be as accurate as possible to avoid possible accumulation of errors because the rest of methodology starts from this coverage. For verification of the result landform coverage, were selected some highways, which are:

- A7 motorway between and Crevillente Fig. 2 Methodology using by GIS - Alicante ring road - A31 highway from the port of Alicante to Albacete From DTM, by implementing Spatial Analyst is boundary calculated the slope, in %, of the province of Alicante. It - AP7 motorway from Alicante ring road to Valencia obtained a slope range from 0 to 85.64%, with the aim of boundary using this parameter for the landform reclassification is divided into two ranges by Geometrical interval, slope < 3.84% and slope > 3.84%.

Fig. 1 Digital Terrain Model of the province of Alicante with the roads photographed.

The main phase of the methodology is the use of GIS to obtain a landform map of Alicante province. To do this, we based primarily on the methodology used by Brabyn (2005) [4] in the Classification of the Landscape of New Zealand. Some modifications have been made due to the difference of surface and relief. As Brabyn, the methodology is mainly based on three parameters: the slope, the relative relief and the profile index. Each parameter is used to identify and classify some specific factors. In the case of the slope is intended to identify from plain to sloping areas; with the relative relief is estimated the relief with respect to a particular area, being able to identify the reliefs different heights;

876 June 15th – 17th, 2011, Venice, Italy Proceedings of the IMProVe 2011 A. P. Merina et al. Landform of Alicante province by using GIS

Fig. 5 Relative relief of Alicante province with roads Fig. 3 Slope of the province of Alicante with roads photography. photographed.

Fig. 6 Relative relief reclassification of Alicante province with roads photographed. Fig. 4 Slope reclassification (slope < 3.84% or slope > 3.84%) of the province of Alicante with roads photographed. The last parameter is Profile Index (PI), which requires to calculate before the maximum elevation of study area The next parameter to consider is the relative relief, to by applying focal neighborhood statistics, and in get this coverage is also started from the DTM that by conjunction with the DTM, is used the following equation applying focal statistics Neighborhood, it obtained a range (eq.1) to get the Profile Index: between 0 to 1408. For better processing of information, the relative relief is reclassified into four groups (relative relief<150, 150>relative relief<300, 300>relative PI%=[(maxelev-DTM)/maxelev]x100 (1) relief<900 and relative relief> 900). Finally, the map obtained is reclassified into two groups: Upland = pi% <50% and Lowland = pi% > 50%.

877 June 15th – 17th, 2011, Venice, Italy Proceedings of the IMProVe 2011 A. P. Merina et al. Landform of Alicante province by using GIS

Fig. 9 Profile Index reclassification of the province of Alicante with roads photographed.

By means of combinations of the three previous parameters, we obtain a classification of eight types of landform: plain, low altitude hill, hill, high altitude hill, mountain, low altitude plateau, plateau and high altitude plateau. Once the photos are taken from field trips, and their coordinates are inserted in the metadata of the images, for later positioning in the GIS, for which it is made an Excel document with the numbering of the photographs and their coordinates, in the WGS84 system. By applying AddXY is created new point coverage, which is hyperlinked to the pictures taken. This coverage is used to verify the result coverage. The photos are taken each 200m, so there are a huge

number of them, for this reason is necessary to select the representative photos of the landform of the area. To do Fig. 7 Maximum elevation of the province of Alicante with this, we made two selections: roads photographed. - The first is through viewshed from motorways and highways studies. It selected the areas from where it appreciates the relief, according to the MDT, in order to select those that have a wide field of view of the area. - In the second is ruled out the images where the presences of human elements and / or with abundant vegetation, in close-ups, are predominated because they do not allow the perception of the field. Once selected the photographs that represent the topography of the area, are coded by the eight types of relief obtained in the phase of GIS, to verify if the landform coverage is adjusted to reality.

Fig. 8 Profile Index of the province of Alicante with roads photographed.

Fig. 10 Viewshed of Alicante province from motorways and highways

878 June 15th – 17th, 2011, Venice, Italy Proceedings of the IMProVe 2011 A. P. Merina et al. Landform of Alicante province by using GIS

Through this study, we know the percentage of each type of landform in Alicante. The dominate landform is high altitude hills with a 37.79% of the province, followed by plains with a 20.84% and low altitude plateau with a 16.39%. Being low altitude hills, hills and mountains least prevalent, as shown in the table and chart (fig. 13) below.

Classification Landform 2,202.399 High Altitude Hill 26.473 High Altitude Plateau 219.969 Hill 54.402 Low Altitude Hill 955.497 Low Altitude Plateau 428.732 Mountain 1,214.887 Plain 725.181 Plateau

Fig. 11 Viewshed from motorways and highways with points from which photographs were taken

3 Result As a result of the interaction of all the coverages and their subsequent verification with field trips to photograph Fig. 13 Surface and percentage of each type of Landform and know in detail the study area, we get a landform map of Alicante, which may be used for future work of the province such as environmental applications using GIS or 4 Conclusion study of the area. The map obtained is show in fig.12. In conclusion we find that the methodology used to obtain relief of Alicante is appropriate, because of the result coverage obtained by using GIS techniques matches with the reality of photos taken from the roads. This system of relief representation can be extrapolated to others areas, within the limitations of the program, regardless of relief type or surface to be studied. This tool is considered useful for further studies such as construction projects and environmental.

Acknowledgement The works presented here are included within the CENIT-OASIS industrial research project, funded by a consortium of companies that own them. This project passed in the fourth CENIT announcement, count on grants from the Center for Technological and Industrial Development (CDTI), an organism depending the Ministry of Science and Innovation (MICINN).

Fig. 12 Landform classification of Alicante province References Landform Area (km 2) Area (%) [1] Sermin Tagil and Jeff Jenness. GIS-Based Plain 1214.8868 20.8473352 Automated Landform Classification and Topographic, Landcover and Geologic. Attributes of Landforma Around Low Altitude Hill 54.4024 0.93353971 the Yazoren Polje, Turkey. Journal of Applied Sciences 8 Hill 219.9693 3.77465105 (6) (2008). High Altitude Hill 2202.3986 37.7929384 [2] G. Bocco, M. Mendoza, A. Velazquez. Remote sensing and GIs-based regional geomorphological Mountain 428.7322 7.35700141 mapping – a tool for land use planning in developing Low Altitude 955.497 16.3962324 countries. Geomorphology 39 (2001). Plateau [3] Li Ma, Dmin Zhou, Lianwang Yin. Automatic Plateau 725.1807 12.4440278 Delineation of Wetland Microtopographies from a Grid DEM (2009). High Altitude 26.473 0.45427402 Plateau [4] Lars Brabyn. Solutions for characterising natural landscape in New Zealand using geographical information

Tab.1 Landform classification of Alicante province

879 June 15th – 17th, 2011, Venice, Italy Proceedings of the IMProVe 2011 A. P. Merina et al. Landform of Alicante province by using GIS

systems. Journal of Environmental Management 76 en la cuenca del río Tepalcatepec a partir de un modelo (2005). digital de elevaciones. Rev. C & G., 19 (3-4) (2005). [5] Clarys Swanwick. Landscape Character Assessment. [7] Lars Brabyn. PhD website. Guide for England and Scotland. Use of Geography http://www.waikato.ac.nz/wfass/subjects/geography/peopl information systems and other computer method. The e/lars/phd/main.htm accessed 12 Feb 2011. Countryside Agency and Scottish natural Heritage (2002). [8] CNIG website. [6] L. Martínez-Zavala, A. Jordán López et all. http://centrodedescargas.cnig.es/CentroDescargas/index.j Clasificación automática de elementos geomorfológicos sp accessed 12 Feb 2011.

880 June 15th – 17th, 2011, Venice, Italy Proceedings of the IMProVe 2011