Cesar Ivan Alvarez

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Verified

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• PhD in Remote Sensing
• Researcher at University of Augsburg

Most of the large cities have an air quality network to measure air pollution including PM10. However, air quality monitoring network has a high cost and it is spatially limited. Quito, capital of Ecuador, is a city with an automatic air quality network (REMMAQ) composed by 9 stations. The REMMAQ works since 2002, measuring PM10 only in 4 regular s...

Objective: The objective of this research was to develop a GeoPortal using the ArcGIS Online platform for the Llanganates-Sangay Connectivity Corridor (CELS) to enhance its management and conservation. Theoretical Framework: The CELS in Ecuador is a key area for ecological connectivity between two protected areas. Due to its extension across differ...

This study uses a remote sensing approach to investigate air quality fluctuations during two short-period social upheaval events caused by civil protests in 2019 and the COVID-19 pandemic in 2020 in Quito, Ecuador. We used data from the TROPOMI Sentinel-P5 satellite to evaluate the concentrations of two greenhouse gases, namely O3 and NO2. TROPOMI...

Forests are essential for maintaining the ecological balance of the planet and providing critical ecosystem services. Amidst an increasing rate of global forest loss due to various natural and anthropogenic factors, many countries are committed to battling forest loss by planting new forests. Despite the reported national statistics on the land are...

Bananas and plantains are vital for food security and smallholder livelihoods in Africa, but diseases pose a significant threat. Traditional disease surveillance methods, like field visits, lack accuracy, especially for specific diseases like Xanthomonas wilt of banana (BXW). To address this, the present study develops a Deep-Learning system to det...

In this study, we performed a preliminary soil analysis and collected environmental data for the Dulcepamba River Basin in Bolivar–Ecuador, before carrying out its hydrological restoration (HR). A geographic information system (GIS) and the multicriterion Analytical Hierarchy Process (AHP) decision-making method were used. The comprehensive evaluat...

The primary climatic parameter frequently scrutinized in water balance assessments for water utilization is precipitation. Given its considerable variability across locations and over time, it is imperative to rely on high-quality statistical information to facilitate accurate analyses. This study aims to refine the estimation of precipitation data...

Concerns about methane (CH4) emissions from rice, a staple sustaining over 3.5 billion people globally, are heightened due to its status as the second-largest contributor to greenhouse gases, driving climate change. Accurate quantification of CH4 emissions from rice fields is crucial for understanding gas concentrations. Leveraging technological ad...

Los lagos desempeñan un papel fundamental en la ecología global, ya que afectan los ciclos del agua, y contribuyen a la biodiversidad. Este estudio evaluó el estado trófico de la Laguna Yahuarcocha mediante el software AQUATOX. Se llevó a cabo un muestreo inicial para estimar los parámetros y valores iniciales del modelo, y posteriormente, se reali...

The objective of this work is to perform a spatial modeling of dissolved oxygen in wastewater discharged without prior treatment and directly to the “Ortega” stream located at the south of Quito. Wastewater disposal has become a serious problem caused by population growth in the surrounding area, affecting the quality of water, soil and air. For th...

Concerns about methane (CH4) emissions from rice, a staple sustaining over 3.5 billion people globally, are heightened due to its status as the second-largest contributor to greenhouse gases, driving climate change. Accurate quantification of CH4 emissions from rice fields is crucial for understanding gas concentrations. Leveraging technological ad...

Large amounts of edible oils are discarded each day from various sources, principally from households. When disposed wrongly into the nature, they can reach the ground, reducing the absorption of nutrients from plants, the aquifers, making them unusable, and finally, water surfaces, affecting the aquatic systems. From a circular economy perspective...

Planted forests are critical to climate change mitigation and constitute a major supplier of timber/non-timber products and other ecosystem services. Globally, approximately 36% of planted forest area is located in East Asia. However, reliable records of the geographic distribution and tree species composition of these planted forests remain very l...

Due to the significant increase of environmental and health problems in recent years, remote sensing has become an alternative for finding new opportunities to minimize their impact. Thus, different options now exist to support public health interventions in Latin America, where resources to create prevention policies are limited compared to develo...

Grassland pastures are crucial for the global food supply through their milk and meat production; hence, forage species monitoring is essential for cattle feed. Therefore, knowledge of pasture above-ground canopy features help understand the crop status. This paper finds how to construct machine learning models to predict above-ground canopy featur...

The objective of the present study was to quantify, geo-locate, model, and characterize domestic used cooking oil (dUCO) generation for the city of Guayaquil. For this reason, and as a prerequisite for the proper planning of municipal cooking oil waste management in the city, we carried out 14-day fieldwork involving 532 households from different p...

A significant contributor to the waste stream is the domestic single-use plastic used in households, being the final disposal in most cases the local landfill. There is a significant opportunity to promote resource recovery and efficiency through the introduction of circular economy strategies. However, the knowledge and management of post-consumer...

The Metropolitan District of Quito (DMQ) does not have all the information needed to design wildfire management strategies based on models and simulations. This work evaluated the use of information related to wildfires in the DMQ obtained from governmental and free sources, using the case study of the Atacazo Hill wildfire (09/29/2018). Topographi...

The use of remote sensing considering Unmanned Aerial Vehicles (UAV) is a recent alternative to collect data from different fields. One of the applications is related to soil parameter estimation considering different multispectral vegetation indexes. The typical use is to establish a relationship between the plant health and a vegetation index. Ho...

#𝐂𝐚𝐥𝐥𝐟𝐨𝐫𝐩𝐚𝐩𝐞𝐫𝐬 I The current Call for Papers «𝑮𝒆𝒐𝒔𝒑𝒂𝒕𝒊𝒂𝒍 𝑺𝒄𝒊𝒆𝒏𝒄𝒆» will be developed on: 𝗚𝗜𝗦 𝗮𝗽𝗽𝗹𝗶𝗲𝗱 𝘁𝗼 𝗲𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁𝗮𝗹 𝘀𝗰𝗶𝗲𝗻𝗰𝗲𝘀/ 𝗥𝗲𝗺𝗼𝘁𝗲 𝘀𝗲𝗻𝘀𝗶𝗻𝗴/ 𝗚𝗲𝗼𝗱𝗲𝘀𝘆 𝗮𝗻𝗱 𝗚𝗡𝗦𝗦/ 𝗨𝗔𝗩/ 𝗖𝗮𝗿𝘁𝗼𝗴𝗿𝗮𝗽𝗵𝘆/ 𝗚𝗲𝗼𝘀𝗽𝗮𝘁𝗶𝗮𝗹 𝗱𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀/ 𝗢𝘁𝗵𝗲𝗿𝘀 𝐃𝐞𝐚𝐝𝐥𝐢𝐧𝐞: April 1st, 2021 𝗦𝘂𝗯𝗷𝗲𝗰𝘁 𝗘𝗱𝗶𝘁𝗼𝗿𝘀: PhD. Ana Claudia Teodoro (Portugal)/ PhD. Norma Beltrão (Brazil) / PhD. César Alvarez (Ecuador) M...

Over the last few years, the use of remote sensing data in different applications such as estimation of air pollution concentration and health applications has become very popular and new. Thus, some studies have established a possible relationship between environmental variables and respiratory health parameters. This study proposes to estimate th...

The activities carried out in daily living, such as personal hygiene and health care, they may cause negative effects on the ecosystem, generating alterations on the environment given that consumed several substances of different origin and chemical composition, these substances are relatively little known regarding the impact that will have on the...

The monitoring of air pollutant concentration within cities is crucial for environment management and public health policies in order to promote sustainable cities. In this study, we present an approach to estimate the concentration of particulate matter of less than 10 µm diameter (PM10) using an empirical land use regression (LUR) model and consi...

Surface ozone is problematic to air pollution. It influences respiratory health. The air quality monitoring stations measure pollutants as surface ozone, but they are sometimes insufficient or do not have an adequate distribution for understanding the spatial distribution of pollutants in an urban area. In recent years, some projects have found a c...

The Andean region has a high cloud density throughout the year. The use of optical remote sensing data in the computation of environmental indices of this region has been hampered by the presence of clouds. To maximize accuracy in the computation of several environmental indices including the normalized difference vegetation index (NDVI), we compar...

El material particulado (PM10), es un contaminante atmosférico capaz de ocasionar una grave problemática en cuanto a calidad del aire y afecciones en la salud humana. Por lo que en la presente investigación se presenta el análisis de las concentraciones de material particulado (PM10) en el sector del aeropuerto de Tababela en el Distrito Metropolit...

To develop the numerical solution for the infiltration behaviour in the soil caused by leachate, we used mathematical software based on the Richards equation with which the simulations for the different simulation scenarios were obtained in the Matlab R2014a programme. This code was used to determine the graph of the three variables mentioned for t...

The leachate generated by the direct disposal of solid waste into the soil of terrace number one of the Romerillos sanitary landfill site contaminates the environment. This is visible from an average distance of up to 20m with the presence of dry vegetation cover showing infiltration by leachate and soil pollution in the surface and underground. Me...

The leachate generated by the direct disposal of solid waste into the soil of terrace number one of the Romerillos sanitary landfill site contaminates the environment. This is visible from an average distance of up to 20m with the presence of dry vegetation cover showing infiltration by leachate and soil pollution in the surface and underground. Me...

The leachate generated by the direct disposal of solid waste into the soil of terrace number one of the Romerillos sanitary landfill site contaminates the environment. This is visible from an average distance of up to 20m with the presence of dry vegetation cover showing infiltration by leachate and soil pollution in the surface and underground. Me...

Mathematical modeling of microbial populations has a long history of application in the fields of ecology and environmental remediation. In the present study, the Verhulst-Pearl growth model and the Malthusian growth model were used to model and understand the kinetics of Photobacterium sp exposed to lead. The results show that goodness of fit of t...

Thin clouds in the optical remote sensing data are frequent and in most of the cases don’t allow to have a pure surface data in order to calculate some indexes as Normalized Difference Vegetation Index (NDVI). This paper aims to evaluate the Automatic Cloud Removal Method (ACRM) algorithm over a high elevation city like Quito (Ecuador), with an alt...

Chronic respiratory disease (CRD) are characterized by recurrent attacks of breathlessness and wheezing, which vary in severity and frequency from person to person. According to WHO, 235 million of people have asthma. Asthma is the most common chronic disease among children (WHO, 2007). PM10 and PM2.5 are considered a problem in the air pollution,...

Urban expansion influences a landscape’s structure and function, covering soils, destroying natural vegetation and disrupting hydrological systems. Green space over an urban area such a park is very important because it is a fundamental component of any urban ecosystem having relationship with the health in a city considering to have low pollution...

La contaminación del aire en las ciudades es un proceso que ha crecido con el pasar de los años. Actualmente se ha buscado reducir esta contaminación y entender los factores que la involucran mediante una buena gestión ambiental, identificando los focos de contaminación con técnicas como estaciones pasivas y automáticas de monitoreo de calidad de a...

El presente artículo está basado en el análisis de datos correspondientes a sismos generados a lo largo del Cinturón de Fuego del Pacífico en el período desde 1970 a 2014, utilizando la base de datos IRIS (Incorporated Research Institutions for Seismology). Con este análisis se determinó que existe una migración de fuentes sísmicas en esta región....

The technology had involved our world and the satellital position aren’t the exception now, this is the reason to BKG had developed one methodology to take data with GNSS (Global Navigation Satellite System) in real time with the NTRIP technique - (Networked Transport of RTCM via Internet Protocol), replacing some Communication technique like UHF r...