Sacha M. O. Siani

Sacha M. O. Siani
Indiana University Bloomington | IUB · Department of Geography

Master of Science

About

25
Publications
9,059
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
140
Citations
Introduction
Sacha Siani is a PhD student in the Department of Geography at Indiana University, Bloomington. His research focuses on understanding social-ecological systems linking in-depth local-scale field research with geospatial analysis of regional-scale landscape change. Siani holds a Master’s degree in Remote Sensing from the National Institute for Space Research (INPE), Brazil (2016), and a Bachelor’s degree in Environmental and Sanitary Engineering from the University of Taubaté, Brazil (2012).
Education
August 2018 - July 2022
Indiana University Bloomington
Field of study
  • Geography
March 2014 - August 2016
January 2008 - December 2012
University of Taubaté
Field of study
  • Environmental and sanitary engineering

Publications

Publications (25)
Article
Full-text available
From state-based developmentalism to community-based initiatives to market-based conservation, the Brazilian Amazon has been a laboratory of development interventions for over 50 years. The region is now confronting a devastating COVID-19 pandemic amid renewed environmental pressures and increasing social inequities. While these forces are shaping...
Article
Full-text available
Climate change is intensifying tropical cyclones, accelerating sea-level rise, and increasing coastal flooding. River deltas are especially vulnerable to flooding because of their low elevations and densely populated cities. Yet, we do not know how many people live on deltas and their exposure to flooding. Using a new global dataset, we show that 3...
Article
Full-text available
Indigenous territories represent ~45% of land categorized as wilderness in the Amazon, but account for <15% of all forest loss on this land. At a time when the Amazon faces unprecedented pressures, overcoming polarization and aligning the goals of wilderness defenders and Indigenous peoples is paramount, to avoid environmental degradation.
Presentation
Full-text available
The Amazon biome is crucial for global climate regulation and the provision of a wide array of economic goods and non-market ecosystem services supporting livelihoods from local to global scales. As the largest continuous tropical forested landscape, the Amazon biome covers the territory of nine countries in South America and has long attracted att...
Conference Paper
Full-text available
The Amazon biome is crucial for global climate regulation and the provision of a wide array of economic goods and non-market ecosystem services supporting livelihoods from local to global scales. As the largest continuous tropical forested landscape, the Amazon biome covers the territory of nine countries in South America and has long attracted att...
Conference Paper
Full-text available
One of the main strategies for Brazilian government to curb deforestation is the creation and management of Conservation Units. The Environmental Protection Area (APA) is a category of Conservation Unit aimed at coupling conservation and sustainable use of natural resources. APAs can be created without the expropriation of land, and may consist of...
Article
The collapse of Fundão dam in Mariana, Minas Gerais, Brazil, released more than 50 million cubic meters of ore tailings into the environment, representing the world's largest mining disaster. Three analyses estimating the forest loss to the ore tailings were produced soon after the collapse but the values varied threefold between them due to differ...
Article
Full-text available
A Área de Proteção Ambiental Mananciais do Rio Paraíba do Sul (APA-MRPS) é um importante instrumento de planejamento territorial ambiental que tem como objetivo proteger os mananciais que abastecem mais de 15 milhões de pessoas no sudeste do Brasil. Este espaço protegido inclui áreas rurais e urbanas, com diferentes contextos sociodemográficos e ní...
Conference Paper
Full-text available
Sand pit extraction, known as " Canchas " , is recognized as one of the major environmental problems in northern Acre. Canchas impact the environment by not allowing the native vegetation to regenerate but also polluting water springs in the nearby areas. This paper has two objectives. First, we test the use of the Sentinel-2 data to detect sand pi...
Conference Paper
Full-text available
Deforestation rates in Brazilian Amazon declined dramatically since 2004. The expansion of protected areas (PA), law enforcement and a set of policy interventions have contributed to this decrease. This paper aims to develop an exploratory analysis of the space-time patterns of seizures related to illegal logging in the period between 2004 and 2015...
Conference Paper
Full-text available
Conservation scientists consider the designation of Protected Areas an important strategy to mitigate socio-environmental damages, biodiversity loss and climate change. Significant environmental impacts are caused every year by fires in Amazonia. In this study, we explore the hypothesis that Protected Areas have an inhibitory role on fire occurrenc...
Conference Paper
Full-text available
The Amazon forest is one of the most prominent tropical rainforest worldwide. Providing several benefits, measures to its protection have been included in governmental decision making. In this context, the Brazilian initiative known as PRODES was implemented in 1988. Coordinated by the National Institute of Space Research, INPE, this project monito...
Presentation
Full-text available
Deforestation rates in Brazilian Amazon declined dramatically since 2004. The expansion of protected areas (PA), law enforcement and a set of policy interventions have contributed to this decrease. This paper aims to develop an exploratory analysis of the space-time patterns of seizures related to illegal logging in the period between 2004 and 2015...
Thesis
Full-text available
A Área de Proteção Ambiental Mananciais do Rio Paraíba do Sul (APA-MRPS) é um importante instrumento de planejamento territorial ambiental que tem como objetivo proteger os mananciais que abastecem mais de 15 milhões de pessoas dos estados de São Paulo, Minas Gerais e Rio de Janeiro. Este espaço protegido inclui áreas rurais e urbanas, com diferent...
Conference Paper
Full-text available
Protected areas of sustainable use such as the Environmental Protection Areas (APA) encompass urban areas. Because the characteristic urban spaces are under dynamic changes, they usually entail problems related to planning land cover. Such areas are fragile, especially when located inside protected areas, so it is necessary to monitor and evaluate...
Conference Paper
Full-text available
As protected areas of sustainable use, Environmental Protection Areas (APAs) allow urban areas presence. Urban spaces are usually under dynamic changes, entailing problems related to planning land cover. This paper aims to identify urban patterns presence and evolution for 1984, 1991 and 2000, in the Environmental Protection Area of Mananciais do R...
Conference Paper
Full-text available
In order to take advantage of remote sensed data obtained from orbital sensors, one must take into account the presence of suspended particulate matter in the atmosphere like water vapor and aerosols and its influence over the data, for that reason, atmospheric correction algorithms like FLAASH where developed. With that in mind, the present paper...
Conference Paper
Full-text available
Classifiers that make use of pixel-by-pixel approaches are limited in the high spatial and radiometric resolution of urban areas, that happens mostly because of the similarity between the target's spectral response like ceramic roofs and bare soil. Because of that, the literature favors approaches that make use of object-oriented analysis for image...
Conference Paper
Full-text available
Este trabalho tem como objetivo geral identificar locais que concentram populações em diferentes condições de sustentabilidade. Apresenta-se uma primeira abordagem para operacionalizar o conceito de desenvolvimento sustentável tendo como foco o município de Ubatuba, propondo como ferramenta um indicador em escala intraurbana, intitulado Índice de S...

Questions

Question (1)
Question
I would like to know (in a practical manner) how to calculate the bivariate (or cross) space-time K-function for clustering analysis between different types of events?
Does anyone have a sample script, or any other document that describes the implementation of the method in R? 
Lynch and Moorcroft (2008) describe the implementation of the method using the splancs package:
"Note that this function (space–time cross-K-function) may be estimated using a weighted average of the more traditional bivariate K-function Kbf(s) (as estimated by the k12hat function in the R package ‘‘splancs’’ (R Development Core Team 2005)), where the insect point process and the fire point process are drawn from different years with a given lag time".
Some papers that used this method:
Thanks in advance!

Network

Cited By

Projects

Projects (3)
Project
Governing environmental services, socio-cultural diversity, and economic activities in the Amazon Basin amid social-environmental and climate change is one of the most pressing challenges for sustainability. While government-driven solutions are commonly viewed as the route to sustainability, most sustainable forest management in the Amazon comes from individual and collective initiatives. This project contributes approaches and analytical tools to catalyze recognition of existing, but often scattered "pieces of solutions" to protect and govern biodiversity and landscapes.
Project
PRIMARY OBJECTIVE Contribute to the understanding of the effects of structural change and urbanisation on tropical deforestation by publishing research papers in leading economics journals. SECONDARY OBJECTIVE Strengthen the Norwegian research environment on development economics and spatial economics by creating international links and build competence on the use of GIS-data.