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  Subjects -> GEOGRAPHY (Total: 493 journals)
Showing 1 - 200 of 277 Journals sorted by number of followers
Geophysical Research Letters     Full-text available via subscription   (Followers: 184)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 159)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 149)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 143)
Remote Sensing of Environment     Hybrid Journal   (Followers: 96)
Antipode     Hybrid Journal   (Followers: 65)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 60)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Progress in Human Geography     Hybrid Journal   (Followers: 60)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 58)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 56)
GIScience & Remote Sensing     Open Access   (Followers: 54)
Journal of Water and Climate Change     Open Access   (Followers: 53)
Climate Change Economics     Hybrid Journal   (Followers: 50)
Reviews of Geophysics     Full-text available via subscription   (Followers: 49)
Remote Sensing Letters     Hybrid Journal   (Followers: 45)
Annals of the American Association of Geographers     Hybrid Journal   (Followers: 43)
Economic Geography     Hybrid Journal   (Followers: 42)
Applied Geography     Hybrid Journal   (Followers: 39)
Climate and Development     Hybrid Journal   (Followers: 34)
Urban Geography     Hybrid Journal   (Followers: 34)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 34)
Annals of GIS     Open Access   (Followers: 31)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Cartography and Geographic Information Science     Hybrid Journal   (Followers: 31)
GPS Solutions     Hybrid Journal   (Followers: 28)
Transactions of the Institute of British Geographers     Hybrid Journal   (Followers: 27)
Journal of Urbanism: International Research on Placemaking and Urban Sustainability     Hybrid Journal   (Followers: 24)
Journal of the Middle East and Africa     Hybrid Journal   (Followers: 23)
Dialogues in Human Geography     Hybrid Journal   (Followers: 20)
China : An International Journal     Full-text available via subscription   (Followers: 20)
Urban Research & Practice     Hybrid Journal   (Followers: 20)
Imago Mundi: The International Journal for the History of Cartography     Hybrid Journal   (Followers: 20)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Atmospheric Measurement Techniques (AMT)     Open Access   (Followers: 19)
Water International     Hybrid Journal   (Followers: 19)
Journal of the American Planning Association     Hybrid Journal   (Followers: 19)
Geography Compass     Hybrid Journal   (Followers: 18)
Journal of Cultural Geography     Hybrid Journal   (Followers: 18)
Cartographica : The International Journal for Geographic Information and Geovisualization     Full-text available via subscription   (Followers: 17)
Professional Geographer     Hybrid Journal   (Followers: 17)
Africa Insight     Full-text available via subscription   (Followers: 16)
Crossings : Journal of Migration & Culture     Hybrid Journal   (Followers: 16)
The Geographical Journal     Hybrid Journal   (Followers: 16)
International Geology Review     Hybrid Journal   (Followers: 16)
Computational Geosciences     Hybrid Journal   (Followers: 15)
Tectonics     Full-text available via subscription   (Followers: 15)
Geomatics, Natural Hazards and Risk     Open Access   (Followers: 14)
American Journal of Geographic Information System     Open Access   (Followers: 14)
Annual Review of Marine Science     Full-text available via subscription   (Followers: 13)
Buildings & Landscapes: Journal of the Vernacular Architecture Forum     Full-text available via subscription   (Followers: 13)
Progress in Physical Geography     Hybrid Journal   (Followers: 13)
International Indigenous Policy Journal     Open Access   (Followers: 13)
Geographical Review     Hybrid Journal   (Followers: 13)
Bulletin of Geosciences     Open Access   (Followers: 12)
Geographical Analysis     Hybrid Journal   (Followers: 11)
Journal of Geography     Hybrid Journal   (Followers: 11)
Geosciences Journal     Hybrid Journal   (Followers: 11)
Geographical Research     Hybrid Journal   (Followers: 11)
Canadian Journal of Soil Science     Full-text available via subscription   (Followers: 11)
GeoJournal     Hybrid Journal   (Followers: 11)
American Journal of Human Ecology     Open Access   (Followers: 11)
Geography and Natural Resources     Hybrid Journal   (Followers: 10)
European Spatial Research and Policy     Open Access   (Followers: 9)
Cartographic Journal     Hybrid Journal   (Followers: 9)
Atmospheric Measurement Techniques Discussions (AMTD)     Open Access   (Followers: 9)
Journal of Iberian and Latin American Research     Hybrid Journal   (Followers: 8)
Physical Geography     Hybrid Journal   (Followers: 8)
International Journal of Health Geographics     Open Access   (Followers: 8)
Natural Science     Open Access   (Followers: 8)
Middle East Development Journal     Hybrid Journal   (Followers: 8)
Journal of Borderlands Studies     Hybrid Journal   (Followers: 8)
Journal of Geographical Systems     Hybrid Journal   (Followers: 8)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 8)
Urban History Review / Revue d'histoire urbaine     Full-text available via subscription   (Followers: 7)
Journal of Latin American Geography     Full-text available via subscription   (Followers: 7)
California Italian Studies Journal     Full-text available via subscription   (Followers: 7)
Geo-spatial Information Science     Open Access   (Followers: 7)
Nordic Journal of Migration Research     Open Access   (Followers: 7)
Journal of Maps     Open Access   (Followers: 7)
Social Geography Discussions (SGD)     Open Access   (Followers: 7)
GeoInformatica     Hybrid Journal   (Followers: 7)
Northern Scotland     Hybrid Journal   (Followers: 6)
Asia Policy     Full-text available via subscription   (Followers: 6)
Australian Geographer     Hybrid Journal   (Followers: 6)
Singapore Journal of Tropical Geography     Hybrid Journal   (Followers: 6)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
The Canadian Geographer/le Geographe Canadien     Hybrid Journal   (Followers: 6)
Creativity Studies     Open Access   (Followers: 5)
Australian Antarctic Magazine     Free   (Followers: 5)
Focus on Geography     Partially Free   (Followers: 5)
Journal of Developmental Entrepreneurship     Hybrid Journal   (Followers: 5)
Asian Geographer     Hybrid Journal   (Followers: 5)
Current Research in Geoscience     Open Access   (Followers: 5)
Journal of Australian Studies     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Journal of Map & Geography Libraries     Hybrid Journal   (Followers: 5)
Transmodernity : Journal of Peripheral Cultural Production of the Luso-Hispanic World     Open Access   (Followers: 4)
Applied Geomatics     Hybrid Journal   (Followers: 4)
Latinoamérica. Revista de estudios Latinoamericanos     Open Access   (Followers: 4)
Bulletin of the Ecological Society of America     Open Access   (Followers: 4)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 4)
Globe, The     Full-text available via subscription   (Followers: 4)
Genre & histoire     Open Access   (Followers: 4)
Journal of Sedimentary Research     Hybrid Journal   (Followers: 4)
Southeastern Europe     Hybrid Journal   (Followers: 3)
Bulletin of Geography. Socio-economic Series     Open Access   (Followers: 3)
Limnological Review     Open Access   (Followers: 3)
Interaction     Full-text available via subscription   (Followers: 3)
Journal of Western Archives     Open Access   (Followers: 3)
Économie rurale     Open Access   (Followers: 3)
Social Dynamics: A journal of African studies     Hybrid Journal   (Followers: 3)
New Zealand Journal of Geography     Hybrid Journal   (Followers: 3)
Journal of Burma Studies     Full-text available via subscription   (Followers: 3)
South Asian Diaspora     Hybrid Journal   (Followers: 3)
All Earth     Open Access   (Followers: 3)
Lithosphere     Open Access   (Followers: 3)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
Polar Research     Open Access   (Followers: 3)
History of Geo- and Space Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Pastoralism : Research, Policy and Practice     Open Access   (Followers: 2)
Standort - Zeitschrift für angewandte Geographie     Hybrid Journal   (Followers: 2)
Norois     Open Access   (Followers: 2)
Geodesy and Cartography     Open Access   (Followers: 2)
Eastern European Countryside     Open Access   (Followers: 2)
Mineralogia     Open Access   (Followers: 2)
Regions and Cohesion     Open Access   (Followers: 2)
Polar Geography     Hybrid Journal   (Followers: 2)
Southeastern Geographer     Full-text available via subscription   (Followers: 2)
BioRisk     Open Access   (Followers: 2)
Norsk Geografisk Tidsskrift - Norwegian Journal of Geography     Hybrid Journal   (Followers: 2)
Scottish Geographical Journal     Hybrid Journal   (Followers: 2)
Geosphere     Open Access   (Followers: 2)
Études rurales     Open Access   (Followers: 2)
Yearbook of the Association of Pacific Coast Geographers     Full-text available via subscription   (Followers: 2)
Polar Journal     Hybrid Journal   (Followers: 2)
Newfoundland and Labrador Studies     Full-text available via subscription   (Followers: 2)
Regional Science Policy & Practice     Hybrid Journal   (Followers: 2)
Provincial China     Hybrid Journal   (Followers: 2)
Geographical Education     Full-text available via subscription   (Followers: 2)
Cahiers franco-canadiens de l'Ouest     Full-text available via subscription   (Followers: 2)
The South Asianist     Open Access   (Followers: 2)
Reflets : revue d'intervention sociale et communautaire     Full-text available via subscription   (Followers: 2)
Maine Policy Review     Open Access   (Followers: 2)
Revista de Geografía Norte Grande     Open Access   (Followers: 1)
Geoforum Perspektiv     Open Access   (Followers: 1)
Estudios Geográficos     Open Access   (Followers: 1)
PRISM : A Journal of Regional Engagement     Open Access   (Followers: 1)
Norteamérica     Open Access   (Followers: 1)
Amerika     Open Access   (Followers: 1)
L'Année du Maghreb     Open Access   (Followers: 1)
Indiana     Open Access   (Followers: 1)
Les Cahiers d'Outre-Mer     Open Access   (Followers: 1)
Journal of the Southwest     Full-text available via subscription   (Followers: 1)
Revue archéologique du Centre de la France     Open Access   (Followers: 1)
Journal of Terrestrial Observation     Open Access   (Followers: 1)
Méditerranée     Open Access   (Followers: 1)
Journal de la Société des Océanistes     Open Access   (Followers: 1)
Geochronometria     Open Access   (Followers: 1)
South African Geographical Journal     Hybrid Journal   (Followers: 1)
GEM - International Journal on Geomathematics     Hybrid Journal   (Followers: 1)
Terrae Incognitae     Hybrid Journal   (Followers: 1)
International Journal of Bahamian Studies     Open Access   (Followers: 1)
Études internationales     Full-text available via subscription   (Followers: 1)
Recherches sociographiques     Full-text available via subscription   (Followers: 1)
Physio-Géo     Open Access   (Followers: 1)
GEOMATICA     Hybrid Journal   (Followers: 1)
European Countryside     Open Access   (Followers: 1)
PSC Discussion Papers Series     Open Access  
Anales de Geografía de la Universidad Complutense     Open Access  
International Journal of River Basin Management     Hybrid Journal  
Revista Geográfica de América Central     Open Access  
Multiciencias     Open Access  
Investigaciones Geográficas (Esp)     Open Access  
Sociedade & Natureza     Open Access  
Región y Sociedad     Open Access  
Migración y Desarrollo     Open Access  
Migraciones Internacionales     Open Access  
Investigaciones Geográficas     Open Access  
Frontera Norte     Open Access  
Cuadernos de Desarrollo Rural     Open Access  
Boletim de Ciências Geodésicas     Open Access  
Territoire en Mouvement     Open Access  
Quaestiones Geographicae     Open Access  
Limes. Cultural Regionalistics     Open Access  
Preview     Hybrid Journal  
Cuadernos de Geografía : Revista Colombiana de Geografía     Open Access  
Studia Universitatis Babes-Bolyai, Geologia     Open Access  
Recherches amérindiennes au Québec     Full-text available via subscription  
Rabaska : revue d'ethnologie de l'Amérique française     Full-text available via subscription  
Port Acadie : revue interdisciplinaire en études acadiennes / Port Acadie: An Interdisciplinary Review in Acadian Studies     Full-text available via subscription  
Études/Inuit/Studies     Full-text available via subscription  
Aurora Journal     Full-text available via subscription  
Revista de la Asociacion Geologica Argentina     Open Access  
San Francisco Estuary and Watershed Science     Open Access  
Journal of Alpine Research : Revue de géographie alpine     Open Access  
Géocarrefour     Open Access  
Confins     Open Access  

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American Journal of Geographic Information System
Number of Followers: 14  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2163-1131 - ISSN (Online) 2163-114X
Published by SAP Homepage  [105 journals]
  • Assessing the Accuracy of Tree Height Quantification Models Derived from
           Unmanned Aerial System Imagery

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 2Mohammadreza Safabakhsh Pachehkenari, Hadi FadaeiIn recent years, scholars have witnessed the increasing progress of using unmanned aerial systems (UASs) in topographic mapping due to its lower cost compared with alternative systems These UASs enables tree height estimation by capturing overlapped images and generating 3D point cloud through the structure from motion (SfM) algorithm. To ensure that the normalized digital surface model (nDSM) in the mountain areas is created accurately, careful attention to flight patterns and uniform distribution of ground control points (GCPs) are necessary. To this end, a quadcopter equipped with an RGB camera is used for imaging an area of 131 hectares in two steps: firstly, through a single flight strip with an optimized distribution of GCP and secondly through an improvement of the flight configuration. Afterward, two nDSMs were created by the automatic processing of raw images of both approaches. The prominent results demonstrate that the smart integration of key parameters in flight design can bring the root mean square errors (RMSE) down to 52.43 cm without the need to include GCPs. However, using GCPs with an appropriate distribution culminates in RMSE of 33.59 cm, which means 35.93% better performance. This study highlights the impacts of optimal distribution in GCP on nDSM accuracy, as well as the strategy of using images extracted from the combination of two flight strips with different altitudes and high overlap when local GCP is inaccessible, was found to be beneficial for increasing the overall nDSM accuracy.
       
  • Spatial Patterns of African Indigenous Vegetables Value Chain Actors: The
           Case of Narok and Kajiado County, Kenya

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 2Juma R. Magogo, David E. Lawver, Mathew T. Baker, Boren-Alpizar Amy, Cynthia McKenney, Agnes O. NkurumwaThe ever-increasing demand of vegetables has emphasized the importance of vegetable commodities in the horticulture industry. Vegetables grown and consumed in Kenya are categorized as either exotic or indigenous. Indigenous vegetables have comparative advantages over exotic vegetables such as high resilience to harsh climates. These vegetables among other crops have in the past significantly contributed to the nutritional and economic wellbeing of agricultural communities. Thus, this study of African indigenous vegetable (AIVs) value chain actors was conducted for the purpose of analyzing spatial patterns of AIVs value chain actors in Narok and Kajiado County to encourage more farmers, particularly women and youth consider AIVs production and marketing as an occupation. The study locations were selected through a systematic sampling technique and households were selected through a simple random sampling technique. Data were collected from 217 (n = 217) respondents and analysis was conducted using nearest neighbor ratio (NNR). The study found clustering of value chain actors and concluded that value chain actors were clustering based on proximity and commodity. The findings imply that value chain actors can form clusters to achieve higher volumes and clusters can be used by Extension service providers as reference points in disseminating agricultural information. Further research is recommended into cluster farming on its suitability as a tool for Extension and organization of farmers’ associations for improving livelihoods. Lastly, information generated by this study would positively contribute towards the development of AIVs value chain strategies in Kenya.
       
  • Land Cover Mapping Using Remote Sensing Data

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 1Jwan Al-doski, Shattri B. Mansor, H'ng Paik San, Zailani KhuzaimahLand cover is a complex parameter because it represents the relationship between socio-economic activities and regional environmental changes, which is why it is important to review and update it periodically. This paper seeks to navigate via a range of subtopics on Land Cover Mapping (LCM) using Remote Sensing (RS) technology for providing enough information that play a significant and prime role in planning, management and monitoring programmes at local, regional and national levels. The literature review structure is described as; give a review of information type and sources with highlights on the strengths and weaknesses of distinct RS information as well as distinct variables extracting from RS information that have been used for LCM. Similarly, the highpoint was done on the LCM techniques which comprise conventional and remote sensed techniques for accurate LCM. For detailed knowledge of the methods, phases, and algorithms of Image classification (IC) for LCM, a brief overview is provided and some issues that influence the efficiency and accuracy of the IC methods were also discussed. From this investigated literature, the most common RS data used for LCM are multispectral, hyperspectral, light detection and ranging (LiDAR), and radio detection and ranging (radar). The choice of appropriate RS data for LCM, however, relies on data accessibility and the particular goal to be obtained and type of classification algorithms. Non-parametric classification algorithms tend to be superior to parametric classification algorithms in LCM using RS data. Nevertheless, the issue which non-parametric algorithms are better than other LCM algorithms was not normally answered. As conclusion, LCM efficiency is influenced by numerous variables like landscape, sampling schedule, training selection techniques and training size, type of non-parametric algorithms, raw data, etc. Thus, these influenced variables need to be addressed before LCM using RS data.
       
  • Spatial Trends and Distribution Patterns of Organic Crop Production in
           Central Kenya

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 1Raphael Mwiti Gikunda, David E. Lawver, Matt Baker, Amy E. Boren-AlpizarThis research adds to knowledge on trends and distribution patterns of organic agriculture (OA) systems. The study was descriptive in nature involving 329 organic farmers selected through stratified random sampling from four counties in Central Kenya. The counties were Nyeri, Murang’a, Kirinyaga, and Kiambu. A peer and expert reviewed semi-structured questionnaire and GPS devices were used for data collection. The mean acreage under OA in the four counties rose significantly from M = 264.88, (tau) τ = .0.44, p < .05 in 2012 to M = 508.95,τ = .95, p < .05 in 2017. The annual income from organic crops increased by 84% from KShs 29,926 ($299.26) in 2012 to KShs 181,635 ($1816.35) in 2017. Most of the organic farms were clustered as reported by the average neighbor index (index = .05, p
       
  • Global Geopotential Models Assessment Using Accurate DGPS/Precise
           Levelling Observations Along the Mediterranean Coastal Line, Egypt: Case
           Study

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 1A. M. Hamdy, B. A. ShaheenThe performance of Global Geopotential Models (GGMs) to calculate Geoid undulation, along the Mediterranean Western Coastal Line from El- Salloum to El- Alameen, Egypt, has been evaluated. The selected region has the both tourism and geodetic of interests. The quality of geoid undulation (N) will obviously affect the resulting orthometric height (H) determined from Differential Global Positioning System (DGPS). The EGM96 and EGM08 (Bi-Linear Interpolation, Bi-Quadratic Interpolation, Triangulation, Nearest Neighbour) have been tested in this study. 𝑁GGMs was computed from “AllTrans v.3.002” EGM08 geoid calculator and free website of “ICGEM” while Nobs was computed from the relationship N= h-H. Over 52 DGPS/Precise Levelling Stations, the computed standard deviation (σ) of differences in (Nobs – 𝑁GGMs) is used as an accuracy indicator. The standard deviation “RMSE” of the undulation differences has been estimated to be ±24cm for EGM08-Bi-Linear Interpolation to ±45cm for EGM08-Nearest Neighbour and ±1.393m for EGM96. There is a marked improvement in the overall RMSE from (EGM08-Nearest Neighbour) to (EGM08-Bi-Linear Interpolation) by 54%. This study showed that EGM08-Bi-Linear Interpolation model has made significant improvement over other models for such like this Northern-coastal line objects. Such a practice presents a suitable alternative, from an economical point of view, to substitute the expensive traditional levelling technique particularly for linear topographic projects with intermediate accurate survey.
       
  • Modeling the Impact of Traveling Time on the Utilization of Maternity
           Services Using Routine Health Facility Data in Siaya County, Western Kenya
           

    • Abstract: Publication year: 2020Source: American Journal of Geographic Information System, Volume 9, Number 1Oluoch Felix, Ayodo George, Owino Fredrick, Okuto ErickIn Kenya, no studies have attempted to use routine health facility data disaggregated by level of care, to find out if there is a significant statistical relationship between physical accessibility and utilization of maternity services at the ward administrative level. A cross-sectional study design used publicly available geospatial data in combination with routine data from the web-based district health information software (DHIS2) platform. AccessMod (version 5.2.6) was used for travelling time analysis. ArcGIS (version 10.5) and R (version 3.5.3) sufficed for the preparation of geospatial input and the manipulation of AccessMod results respectively. The associations between the independent and dependable outcome was computed using a Zero-inflated Poisson regression model at 95% confidence level. The findings in Siaya County revealed a higher likelihood of a skilled delivery 35% (0.353; CI: 0.349–0.357) and 16% (0.164; CI: 0.162–0.167) respectively, for every unit increase in the proportion of pregnant women who could reach a hospital and health centre within an hour of walking, as compared to being within an hour of a dispensary 4.6% (0.046; CI: 0.045–0.048) using motorcycle transport. Simply advising women to opt for motorized transportation schemes to improve their access to low quality facilities, may in fact, result in diminishing returns. The immediate implication is that policy makers need to upgrade lower tier maternity health services in Siaya County, as pregnant women may value quality of services regardless of the distance. Future research should consider looking at the relationship between skilled delivery and the capacity of existing maternity health services.
       
  • Modelling of Lake Water Quality Parameters by Deep Learning Using Remote
           Sensing Data

    • Abstract: Publication year: 2019Source: American Journal of Geographic Information System, Volume 8, Number 6Randrianiaina Jerry J. C. F., Rakotonirina Rija I., Ratiarimanana Jean R., Lahatra Razafindramisa FilsThe modelling of lake water quality is very important to make some prediction and to monitor it. Modelling Lake water quality, utilizing the data obtained from the in-situ measurements, collecting samples from the in situ and analyzing them in a laboratory are very expensive and time consuming. Several algorithms can be used to model lake water quality using the in-situ measurements data. In this work, Deep Learning was used to perform pH, dissolved oxygen, conductivity and turbidity modelling of the Itasy Lake. Deep Learning is another branch of machine learning or automatic training that works well to solve many problems. The obtained results demonstrated that the developed model of a deep neural network (deep learning) provides an excellent relationship between the observed and simulated water quality parameters. Moreover, the coefficient of correlation (R2) was 0.89 for pH, 0.97 for the dissolved oxygen, 0.96 for the conductivity and 0.99 for the turbidity. The root mean square error (RMSE) values for pH, dissolved oxygen, conductivity and turbidity were below 0.22, 0.21 mg.l-1, 1.37 µS.cm-1, and 0.53 NTU respectively, during the deep learning training and validation phases. After getting the model, the parameters of the Itasy Lake water were estimated on 1st January 2019. The obtained results are as follows: pH was ranged from 7.1 to 7.6, 7.0 mg.l-1 to 7.2 mg.l-1 for the dissolved oxygen, 55.7 µS.cm-1 to 57.1 µS.cm-1 for the conductivity and 12.0 to 12.2 for the turbidity. It was shown that the water quality of Itasy respects the Malagasy norm with regard to pH, dissolved oxygen, conductivity and turbidity. And the mean values for these parameters were respectively 7.6 for pH, 7.01 mg.l-1 for the dissolved oxygen, 57.05 µS.cm-1 for the conductivity and 12.03 NTU for the turbidity.
       
  • Integrating Modern Classifiers for Improved Building Extraction from
           Aerial Imagery and LiDAR Data

    • Abstract: Publication year: 2019Source: American Journal of Geographic Information System, Volume 8, Number 5Haidy Elsayed, Mohamed Zahran, Ayman ElShehaby, Mahmoud SalahThis research proposed an approach for automatic extraction of buildings from digital aerial imagery and LiDAR data. The building patches are detected from the original image bands, normalized Digital Surface Model (nDSM) and some ancillary data. Support Vector Machines (SVMs) and artificial neural network (ANNs) classifiers have been applied individualey as member classifiers. In order to improve the obtained results, SVMs and ANNs have been combined in serial, parallel and hybrid forms. The results showed that hybrid system has performed the best with an overall accuracy of about 87.211% followed by parallel combination, serial combination, ANNs and SVMs with 84.709, 82.102, 77.605 and 74.288% respectively.
       
  • Flood Frequency Analysis and Urban Flood Modelling of Sidi Ifni Basin,
           Southern Morocco

    • Abstract: Publication year: 2019Source: American Journal of Geographic Information System, Volume 8, Number 5Aicha Saad, Adam Milewski, Lahcen Benaabidate, Zin El Abidine El Morjani, Lhoucine BouchaouFlood impact is one of the most significant disasters in the world. Floods are due to natural factors such as heavy rainfall, high floods and high tides, etc., and human factors such as blocking of channels or aggravation of drainage channels, improper land use, deforestation in headwater regions, among others. With the increasing use of GIS, HEC-RAS and digital databases in the floodplain mapping and management processes, the present paper develops a simplified one-dimensional model applied to the Sidi Ifni basin. This approach allows visualizing and quantifying the results in a spatial format. A Digital elevation Model (DEM) was used to create hydraulic model geometry data. The computational procedures were based on a 1D energy equation for steady flow water surface profile calculations. Flows were assessed from a frequency analysis of the only gauging station data. The results have shown that the return period of the observed floods 1985, 2002 and 2015 is respectively about 20-year, 10-year and 50-year, a lateral overflow of the decadal and centennial floods where the maximum water depth is 6.78m for Q (10) and 6.96 m for Q (100). The results obtained can be useful to guide the development plan of the Sidi Ifni city, which is growing.
       
  • Study the Effect of Surrounding Surface Material Types on the Multipath of
           GPS Signal and Its Impact on the Accuracy of Positioning Determination

    • Abstract: Publication year: 2019Source: American Journal of Geographic Information System, Volume 8, Number 5Ahmed S. Mohamed, Mohamed I. Doma, Mostafa M. RabahGlobal Positioning System (GPS) results are suffering from one of the major errors in high precision GPS positioning, the ones caused by reflections, known as Multipath error. Here, we study some of the multipath factors affecting on the accuracy observables obtained from GPS measurements. This will be achieved through monitoring and record the multipath effect according to different types of surface which reflected the signals specific set of generating and monitoring systems for multipath signal is established and a series of controlled experiments are carried out. Experimental results show that Aluminium caused the highest amount of multipath. This is followed by Glass and Wood.
       
 
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