Neema Sumari | Wuhan University (original) (raw)

Papers by Neema Sumari

Research paper thumbnail of Urban growth dynamics and expansion forms in 11 Tanzanian cities from 1990 to 2020

International Journal of Digital Earth

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Research paper thumbnail of Razvoj normaliziranog indeksa tla za urbane studije upotrebom podataka daljinskih mjerenja

Geofizika

This paper presents two novel spectral soil area indices to identify bare soil area and distingui... more This paper presents two novel spectral soil area indices to identify bare soil area and distinguish it more accurately from the urban impervious surface area (ISA). This study designs these indices based on medium spatial resolution remote sensing data from Landsat 8 OLI dataset. Extracting bare soil or urban ISA is more challenging than extracting water bodies or vegetation in multispectral Remote Sensing (RS). Bare soil and the urban ISA area often were mixed because of their spectral similarity in multispectral sensors. This study proposes Normalized Soil Area Index 1 (NSAI1) and Normalized Soil Area Index 2 (NSAI2) using typical multispectral bands. Experiments show that these two indices have an overall accuracy of around 90%. The spectral similarity index (SDI) shows these two indices have higher separability between soil area and ISA than previous indices. The result shows that percentile thresholds can effectively classify bare soil areas from the background. The combined us...

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Research paper thumbnail of Analysis of geospatial data of Morogoro Urban: lessons for educationists and researchers

ResearchGate, May 1, 2019

Conference Proceedings: The 1 st International Conference on Innovative Education and Policy Refo... more Conference Proceedings: The 1 st International Conference on Innovative Education and Policy Reforms for Industrial Economy in Africa, pg 630-649There has been a growing need of scientists to utilize geospatial data in a variety of fields of study due to the advancement of ICT as a tool for both gathering and analyzing geospatial data. As Geographic Information System (GIS) gains momentum, the use of geospatial data becomes prominent in education especially in subjects that deal with place and space processes such as geography. Unfortunately in developing countries propagation of GIS in education is of low pace partly because of less utilization of ICT and ICT based technologies in teaching and learning. In order to address the problem of underutilization of geospatial data in education teachers‘ knowledge, skills and motivation for using GIS data needs to be reinforced. This paper shows why the use of geospatial data in geography is necessary. It shows how teachers and students in schools can be both supported and motivated to use geospatial data with reference to analysis of information based on satellite images of Morogoro urban district. The paper shows the way these geospatial data can be used to address various questions raised for each topic in geography at advanced level secondary school. The discussion part shades light on the path that needs to be followed by policy makers to mobilize efforts of educationists and other experts in geography, mathematics, statistics and ICT based disciplines. The efforts should focus on gathering and analyzing more of GIS data and also simplify their accessibility by classroom teachers so that they can improve their classroom practice and outdoor learning avenues. The foreseen challenges and the role of individual stakeholders to advance the uses of GIS data in education are also highlighted

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Research paper thumbnail of Final Technical Report Assessing the impacts of climate variability and change on agricultural systems in Eastern Africa while enhancing the region's capacity to undertake integrated assessment of vulnerabilities to future changes in climate

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Research paper thumbnail of Challenges and Opportunities for the Advancement of GIS Education in TANZANIA

Journal of Education and Practice, 2017

Rapid developments in science and technology have driven utilization of Geographical Information ... more Rapid developments in science and technology have driven utilization of Geographical Information Science (GIS) in various fields of Planning, Management, and exploitation of environmental resources and provision of social services. As information technology gains momentum, GIS uses information science infrastructure to address the problems of geography, cartography, geosciences locations and related branches of science and engineering; that is shortly referred to as Geo-informatics. Increased application of GIS calls for more demand of advanced Geo-informatics education worldwide. This study has established major challenges for the advancement of Geo-informatics education in Tanzania and any possible opportunities which can be utilized for the improvement of the same. Prominent challenges identified could be associated with lack of reliable power, internet connection, computer system and accessories and appropriate software. Other challenges were related to the nature of the school ...

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Research paper thumbnail of On the development of climate data visualization tool for interpretation of empirical results from c

In time of climate change there is a lot of interest in communicating detailed information and kn... more In time of climate change there is a lot of interest in communicating detailed information and knowledge pertaining to climate to different stakeholders. In order to aid informed decision making related to changing climate and weather variability there is need for data visualization tool. Data visualization tool plays a great role in interpreting bulk climate information produced or collected from different districts, regions and nations at large. In Tanzania, online real-time data visualization tool can help to bridge the gap in the current system whereby climate information is disseminated using television, radio as well as face-to face. These methods have many problems, one being difficulty for end user to aggregate the disseminated climate information over long period of time. This paper seeks to present a work toward developing of a tool for such purpose. The work was done by Database for Crop Models Simulation team from Tanzania with consultation of team members from Kenya, Ug...

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Research paper thumbnail of Characterizing Urban Expansion Combining Concentric-Ring and Grid-Based Analysis for Latin American Cities

Land, 2021

Spatio-temporal characterization of urban expansion is the first step towards understanding how c... more Spatio-temporal characterization of urban expansion is the first step towards understanding how cities grow in space. We summarize two approaches used in urban expansion measurement, namely, concentric-ring analysis and grid-based analysis. Concentric-ring analysis divides urban areas into a series of rings, which is used to quantify the distance decay of urban elements from city centers. Grid-based analysis partitions a city into regular grids that are used to interpret local dynamics of urban growth. We combined these two approaches to characterize the urban expansion between 2000–2014 for five large Latin American cities (São Paulo, Brazil; Mexico City, Mexico; Buenos Aires, Argentina; Bogotá, Columbia; Santiago, Chile). Results show that the urban land (built-up area) density in concentric rings decreases from city centers to urban fringe, which can be well fitted by an inverse S curve. Parameters of fitting curves reflect disparities of urban extents and urban form among these ...

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Research paper thumbnail of On the absurdity of rapid urbanization: Spatio-temporal analysis of land-use changes in Morogoro, Tanzania

Cities, 2020

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Research paper thumbnail of The Design and Development of a Secure Internet-based Protocol for the Control of a Remote Solar Tracker

2012 ASEE Annual Conference & Exposition Proceedings

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Research paper thumbnail of A Geospatial Approach to Sustainable Urban Planning: Lessons for Morogoro Municipal Council, Tanzania

Sustainability, 2019

Sustainable urban planning is essential in mediating the natural and built environments globally,... more Sustainable urban planning is essential in mediating the natural and built environments globally, yet, there is little progress as regards its attainment in developing countries. Rapid and unplanned urbanization continue to threaten the sustainability of many cities in Africa. By selecting Morogoro Municipal Council (MMC) in Tanzania as an example, this study applied well-known remote sensing techniques to understand the dynamics of urban growth and the implications for sustainable urban planning. The study analyzes spatio-temporal characteristics for eighteen years (2000–2018) based on urban land density using gradient and grid-based analysis to further examine land use and urban land density nexus. The results indicate declining urban land densities with distance to the city center, indicating a less compact and fragmented development at the urban fringes; and northward development with limited development to the south of MCC. The knowledge and understanding of the patterns of spa...

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Research paper thumbnail of Geospatial Distribution and Accessibility of Primary and Secondary Schools: A case of Abbottabad City, Pakistan

Proceedings of the ICA, 2019

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Research paper thumbnail of Pattern analysis of substandard and inadequate distribution of educational resources in urban–rural areas of Abbottabad, Pakistan

GeoJournal, 2019

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Research paper thumbnail of Status of geoinformatics education and training in Sub-Saharan Africa: initiatives taken and challenges

Journal of Geography in Higher Education, 2019

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Research paper thumbnail of Urban expansion and form changes across African cities with a global outlook: Spatiotemporal analysis of urban land densities

Journal of Cleaner Production, 2019

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Research paper thumbnail of Fuzzy AutoEncode Based Cloud Detection for Remote Sensing Imagery

Remote Sensing, 2017

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Research paper thumbnail of Urban Expansion: A Geo-Spatial Approach for Temporal Monitoring of Loss of Agricultural Land

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017

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Research paper thumbnail of Impacts of climate change on agriculture: What, when, where and how?

• A systematic increase in the maximum and minimum temperature is evident since late nineties. Av... more • A systematic increase in the maximum and minimum temperature is evident since late nineties. Average annual minimum temperatures Dodoma station increased at the rate of 0.0130C and maximum temperature has increased by 0.0360C every year from 1980-2010. Minimum and maximum temperature for Morogoro station has increased respectively 0.036oC and 0.044oC every year. • Though all GCMs predicted a general increase in maximum and minimum temperatures at all locations, there are differences in the magnitude of this increase The median values for the 20 GCMs show the decline of rainfall in mid centaury period on both RCP4.5 and RCP8.5 by -1.1% and -0.8%, respectively. Increase in rainfall towards end century-periods are 1.4 and 5.0% under RCP 4.5 and RCP 8.5, respectively. • Climate change has both positive and negative impacts on maize yields. Simulation results with APSIM indicate that maize yields will increase by 5% towards mid-century under RCP 4.5 emission scenario in LHZ1. The incre...

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Research paper thumbnail of UC2013 Presentationsumari

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Research paper thumbnail of Urban sprawl and its impact on sustainable urban development: a combination of remote sensing and social media data

Geo-spatial Information Science, 2020

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Research paper thumbnail of Urban sprawl and its impact on sustainable urban development: a combination of remote sensing and social media data

Geo-spatial Information Science Vol. 23, No. 3, 2020

Urbanization is one of the most impactful human activities across the world today affecting the q... more Urbanization is one of the most impactful human activities across the world today affecting the quality of urban life and its sustainable development. Urbanization in Africa is occurring at an unprecedented rate and it threatens the attainment of Sustainable Development Goals (SDGs). Urban sprawl has resulted in unsustainable urban development patterns from social, environmental , and economic perspectives. This study is among the first examples of research in Africa to combine remote sensing data with social media data to determine urban sprawl from 2011 to 2017 in Morogoro urban municipality, Tanzania. Random Forest (RF) method was applied to accomplish imagery classification and location-based social media (Twitter usage) data were obtained through a Twitter Application Programming Interface (API). Morogoro urban municipality was classified into built-up, vegetation, agriculture, and water land cover classes while the classification results were validated by the generation of 480 random points. Using the Kernel function, the study measured the location of Twitter users within a 1 km buffer from the center of the city. The results indicate that, expansion of the city (built-up land use), which is primarily driven by population expansion, has negative impacts on ecosystem services because pristine grasslands and forests which provide essential ecosystem services such as carbon sequestration and support for biodiversity have been replaced by built-up land cover. In addition, social media usage data suggest that there is the concentration of Twitter usage within the city center while Twitter usage declines away from the city center with significant spatial and numerical increase in Twitter usage in the study area. The outcome of the study suggests that the combination of remote sensing, social sensing, and population data were useful as a proxy/inference for interpreting urban sprawl and status of access to urban services and infrastructure in Morogoro, and Africa city where data for urban planning is often unavailable , inaccurate, or stale. ARTICLE HISTORY

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Research paper thumbnail of Urban growth dynamics and expansion forms in 11 Tanzanian cities from 1990 to 2020

International Journal of Digital Earth

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Razvoj normaliziranog indeksa tla za urbane studije upotrebom podataka daljinskih mjerenja

Geofizika

This paper presents two novel spectral soil area indices to identify bare soil area and distingui... more This paper presents two novel spectral soil area indices to identify bare soil area and distinguish it more accurately from the urban impervious surface area (ISA). This study designs these indices based on medium spatial resolution remote sensing data from Landsat 8 OLI dataset. Extracting bare soil or urban ISA is more challenging than extracting water bodies or vegetation in multispectral Remote Sensing (RS). Bare soil and the urban ISA area often were mixed because of their spectral similarity in multispectral sensors. This study proposes Normalized Soil Area Index 1 (NSAI1) and Normalized Soil Area Index 2 (NSAI2) using typical multispectral bands. Experiments show that these two indices have an overall accuracy of around 90%. The spectral similarity index (SDI) shows these two indices have higher separability between soil area and ISA than previous indices. The result shows that percentile thresholds can effectively classify bare soil areas from the background. The combined us...

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Research paper thumbnail of Analysis of geospatial data of Morogoro Urban: lessons for educationists and researchers

ResearchGate, May 1, 2019

Conference Proceedings: The 1 st International Conference on Innovative Education and Policy Refo... more Conference Proceedings: The 1 st International Conference on Innovative Education and Policy Reforms for Industrial Economy in Africa, pg 630-649There has been a growing need of scientists to utilize geospatial data in a variety of fields of study due to the advancement of ICT as a tool for both gathering and analyzing geospatial data. As Geographic Information System (GIS) gains momentum, the use of geospatial data becomes prominent in education especially in subjects that deal with place and space processes such as geography. Unfortunately in developing countries propagation of GIS in education is of low pace partly because of less utilization of ICT and ICT based technologies in teaching and learning. In order to address the problem of underutilization of geospatial data in education teachers‘ knowledge, skills and motivation for using GIS data needs to be reinforced. This paper shows why the use of geospatial data in geography is necessary. It shows how teachers and students in schools can be both supported and motivated to use geospatial data with reference to analysis of information based on satellite images of Morogoro urban district. The paper shows the way these geospatial data can be used to address various questions raised for each topic in geography at advanced level secondary school. The discussion part shades light on the path that needs to be followed by policy makers to mobilize efforts of educationists and other experts in geography, mathematics, statistics and ICT based disciplines. The efforts should focus on gathering and analyzing more of GIS data and also simplify their accessibility by classroom teachers so that they can improve their classroom practice and outdoor learning avenues. The foreseen challenges and the role of individual stakeholders to advance the uses of GIS data in education are also highlighted

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Research paper thumbnail of Final Technical Report Assessing the impacts of climate variability and change on agricultural systems in Eastern Africa while enhancing the region's capacity to undertake integrated assessment of vulnerabilities to future changes in climate

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Challenges and Opportunities for the Advancement of GIS Education in TANZANIA

Journal of Education and Practice, 2017

Rapid developments in science and technology have driven utilization of Geographical Information ... more Rapid developments in science and technology have driven utilization of Geographical Information Science (GIS) in various fields of Planning, Management, and exploitation of environmental resources and provision of social services. As information technology gains momentum, GIS uses information science infrastructure to address the problems of geography, cartography, geosciences locations and related branches of science and engineering; that is shortly referred to as Geo-informatics. Increased application of GIS calls for more demand of advanced Geo-informatics education worldwide. This study has established major challenges for the advancement of Geo-informatics education in Tanzania and any possible opportunities which can be utilized for the improvement of the same. Prominent challenges identified could be associated with lack of reliable power, internet connection, computer system and accessories and appropriate software. Other challenges were related to the nature of the school ...

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Research paper thumbnail of On the development of climate data visualization tool for interpretation of empirical results from c

In time of climate change there is a lot of interest in communicating detailed information and kn... more In time of climate change there is a lot of interest in communicating detailed information and knowledge pertaining to climate to different stakeholders. In order to aid informed decision making related to changing climate and weather variability there is need for data visualization tool. Data visualization tool plays a great role in interpreting bulk climate information produced or collected from different districts, regions and nations at large. In Tanzania, online real-time data visualization tool can help to bridge the gap in the current system whereby climate information is disseminated using television, radio as well as face-to face. These methods have many problems, one being difficulty for end user to aggregate the disseminated climate information over long period of time. This paper seeks to present a work toward developing of a tool for such purpose. The work was done by Database for Crop Models Simulation team from Tanzania with consultation of team members from Kenya, Ug...

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Research paper thumbnail of Characterizing Urban Expansion Combining Concentric-Ring and Grid-Based Analysis for Latin American Cities

Land, 2021

Spatio-temporal characterization of urban expansion is the first step towards understanding how c... more Spatio-temporal characterization of urban expansion is the first step towards understanding how cities grow in space. We summarize two approaches used in urban expansion measurement, namely, concentric-ring analysis and grid-based analysis. Concentric-ring analysis divides urban areas into a series of rings, which is used to quantify the distance decay of urban elements from city centers. Grid-based analysis partitions a city into regular grids that are used to interpret local dynamics of urban growth. We combined these two approaches to characterize the urban expansion between 2000–2014 for five large Latin American cities (São Paulo, Brazil; Mexico City, Mexico; Buenos Aires, Argentina; Bogotá, Columbia; Santiago, Chile). Results show that the urban land (built-up area) density in concentric rings decreases from city centers to urban fringe, which can be well fitted by an inverse S curve. Parameters of fitting curves reflect disparities of urban extents and urban form among these ...

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Research paper thumbnail of On the absurdity of rapid urbanization: Spatio-temporal analysis of land-use changes in Morogoro, Tanzania

Cities, 2020

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Research paper thumbnail of The Design and Development of a Secure Internet-based Protocol for the Control of a Remote Solar Tracker

2012 ASEE Annual Conference & Exposition Proceedings

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Research paper thumbnail of A Geospatial Approach to Sustainable Urban Planning: Lessons for Morogoro Municipal Council, Tanzania

Sustainability, 2019

Sustainable urban planning is essential in mediating the natural and built environments globally,... more Sustainable urban planning is essential in mediating the natural and built environments globally, yet, there is little progress as regards its attainment in developing countries. Rapid and unplanned urbanization continue to threaten the sustainability of many cities in Africa. By selecting Morogoro Municipal Council (MMC) in Tanzania as an example, this study applied well-known remote sensing techniques to understand the dynamics of urban growth and the implications for sustainable urban planning. The study analyzes spatio-temporal characteristics for eighteen years (2000–2018) based on urban land density using gradient and grid-based analysis to further examine land use and urban land density nexus. The results indicate declining urban land densities with distance to the city center, indicating a less compact and fragmented development at the urban fringes; and northward development with limited development to the south of MCC. The knowledge and understanding of the patterns of spa...

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Research paper thumbnail of Geospatial Distribution and Accessibility of Primary and Secondary Schools: A case of Abbottabad City, Pakistan

Proceedings of the ICA, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Pattern analysis of substandard and inadequate distribution of educational resources in urban–rural areas of Abbottabad, Pakistan

GeoJournal, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Status of geoinformatics education and training in Sub-Saharan Africa: initiatives taken and challenges

Journal of Geography in Higher Education, 2019

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Research paper thumbnail of Urban expansion and form changes across African cities with a global outlook: Spatiotemporal analysis of urban land densities

Journal of Cleaner Production, 2019

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Research paper thumbnail of Fuzzy AutoEncode Based Cloud Detection for Remote Sensing Imagery

Remote Sensing, 2017

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Research paper thumbnail of Urban Expansion: A Geo-Spatial Approach for Temporal Monitoring of Loss of Agricultural Land

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Impacts of climate change on agriculture: What, when, where and how?

• A systematic increase in the maximum and minimum temperature is evident since late nineties. Av... more • A systematic increase in the maximum and minimum temperature is evident since late nineties. Average annual minimum temperatures Dodoma station increased at the rate of 0.0130C and maximum temperature has increased by 0.0360C every year from 1980-2010. Minimum and maximum temperature for Morogoro station has increased respectively 0.036oC and 0.044oC every year. • Though all GCMs predicted a general increase in maximum and minimum temperatures at all locations, there are differences in the magnitude of this increase The median values for the 20 GCMs show the decline of rainfall in mid centaury period on both RCP4.5 and RCP8.5 by -1.1% and -0.8%, respectively. Increase in rainfall towards end century-periods are 1.4 and 5.0% under RCP 4.5 and RCP 8.5, respectively. • Climate change has both positive and negative impacts on maize yields. Simulation results with APSIM indicate that maize yields will increase by 5% towards mid-century under RCP 4.5 emission scenario in LHZ1. The incre...

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Research paper thumbnail of UC2013 Presentationsumari

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Research paper thumbnail of Urban sprawl and its impact on sustainable urban development: a combination of remote sensing and social media data

Geo-spatial Information Science, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Urban sprawl and its impact on sustainable urban development: a combination of remote sensing and social media data

Geo-spatial Information Science Vol. 23, No. 3, 2020

Urbanization is one of the most impactful human activities across the world today affecting the q... more Urbanization is one of the most impactful human activities across the world today affecting the quality of urban life and its sustainable development. Urbanization in Africa is occurring at an unprecedented rate and it threatens the attainment of Sustainable Development Goals (SDGs). Urban sprawl has resulted in unsustainable urban development patterns from social, environmental , and economic perspectives. This study is among the first examples of research in Africa to combine remote sensing data with social media data to determine urban sprawl from 2011 to 2017 in Morogoro urban municipality, Tanzania. Random Forest (RF) method was applied to accomplish imagery classification and location-based social media (Twitter usage) data were obtained through a Twitter Application Programming Interface (API). Morogoro urban municipality was classified into built-up, vegetation, agriculture, and water land cover classes while the classification results were validated by the generation of 480 random points. Using the Kernel function, the study measured the location of Twitter users within a 1 km buffer from the center of the city. The results indicate that, expansion of the city (built-up land use), which is primarily driven by population expansion, has negative impacts on ecosystem services because pristine grasslands and forests which provide essential ecosystem services such as carbon sequestration and support for biodiversity have been replaced by built-up land cover. In addition, social media usage data suggest that there is the concentration of Twitter usage within the city center while Twitter usage declines away from the city center with significant spatial and numerical increase in Twitter usage in the study area. The outcome of the study suggests that the combination of remote sensing, social sensing, and population data were useful as a proxy/inference for interpreting urban sprawl and status of access to urban services and infrastructure in Morogoro, and Africa city where data for urban planning is often unavailable , inaccurate, or stale. ARTICLE HISTORY

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Research paper thumbnail of Analysis of Geospatial Data of Morogoro Urban: Lessons for Educationists and Researchers

Conference Proceedings, 2018

There has been a growing need of scientists to utilize geospatial data in a variety of fields of ... more There has been a growing need of scientists to utilize geospatial data in a variety of fields of study due to the advancement of ICT as a tool for both gathering and analyzing geospatial data. As Geographic Information System (GIS) gains momentum, the use of geospatial data becomes prominent in education especially in subjects that deal with place and space processes such as geography. Unfortunately in developing countries propagation of GIS in education is of low pace partly because of less utilization of ICT and ICT based technologies in teaching and learning. In order to address the problem of underutilization of geospatial data in education teachers' knowledge, skills and motivation for using GIS data needs to be reinforced. This paper shows why the use of geospatial data in geography is necessary. It shows how teachers and students in schools can be both supported and motivated to use geospatial data with reference to analysis of information based on satellite images of Morogoro urban district. The paper shows the way these geospatial data can be used to address various questions raised for each topic in geography at advanced level secondary school. The discussion part shades light on the path that needs to be followed by policy makers to mobilize efforts of educationists and other experts in geography, mathematics, statistics and ICT based disciplines. The efforts should focus on gathering and analyzing more of GIS data and also simplify their accessibility by classroom teachers so that they can improve their classroom practice and outdoor learning avenues. The foreseen challenges and the role of individual stakeholders to advance the uses of GIS data in education are also highlighted.

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