1,720,952 research outputs found
Initial Registration of 3D Parcels: Position Paper 2
No full textThis is a discussion paper for initiating an on-going conversation on “Initial Registration of 3D Parcels” in the working session at the 4th International Workshop on 3D Cadastres. The working session will focus on 3D registration from multiple points of view. Figure 1 shows the aspects of 3D registration that will be discussed in the working session. The aim of the discussion is to critically analyse the most distinguishing features of 3D registration. Concentrating on the main topics and their related sub-topics will enable to further consolidate experiences and knowledge on the primary step towards the realisation of 3D cadastre
Semantics-based Fusion for CityGML and 3D LandXML
No full textFor any developments that require spatial data, often the fusion of diverse spatial datasets is unavoidable. For instance in developing a 3D cadastral database serving various purposes, data may need to be sourced from different spatial datasets such as: building design models in BIM (Building Information Model) format, topographic and built environment information in CityGML, and cadastral legal boundaries in LandXML. Syntactically and systematically this is not difficult provided the formats of datasets involved are open and are XML-based, but the fusion becomes non trivial when semantic heterogeneity occurs between schemas for example between LandXML and CityGML. This paper proposes a semantics-based fusion framework to integrate CityGML and 3D LandXML. The paper adopts the ePlan conceptual model, which is implemented in LandXML in Australia and New Zealand. Compared with the standard LandXML schema, the ePlan model is comprehensive to represent specifically cadastral survey information. The ePlan model is integrated with the Building module of CityGML through the LADM OWL Ontology. In previous research, ISO 19152 Land Administration Domain Model (LADM) has been formalized in Web Ontology Language (OWL). To integrate 3D LandXML and CityGML, this LADM OWL ontology is extended with new concepts: Physical Space Building Unit and Physical Space Utility Network and new relation: hasLegalSpace. Every concept in OWL ontology has a unique URI (Uniform Resource Identifier). The URIs of Physical Space Building Unit and Legal Space Building Unit from the LADM OWL ontology are respectively referenced by CityGML’s ExternalReference element and LandXML’s DocFileRef element. The proposed framework attempts to integrate not only the semantic models inherent in the schemas but also the geometries from CityGML and LandXML. Through this semanticsbased fusion, it is expected that a computer system will be able to do reasoning and inference in the OWL ontology. The computer system will also be able to retrieve the geometries of building unit’s legal space or physical construct, or both, through the ExternalReference and DocFileRef elements. The objective of the framework is to preserve the best of all worlds without changing the existing schemas. Although the framework is a preliminary study and no operational implementation has been done so far, this paper hopes to provide a useful reference in discussing the future directions and harmonization of the schemas
Ionization-induced star formation - IV. Triggering in bound clusters
No full textWe present a detailed study of star formation occurring in bound star-forming clouds under the influence of internal ionizing feedback from massive stars across a spectrum of cloud properties. We infer which objects are triggered by comparing our feedback simulations with control simulations in which no feedback was present. We find that feedback always results in a lower star formation efficiency and usually but not always results in a larger number of stars or clusters. Cluster mass functions are not strongly affected by feedback, but stellar mass functions are biased towards lower masses. Ionization also affects the geometrical distribution of stars in ways that are robust against projection effects, but may make the stellar associations more or less subclustered depending on the background cloud environment. We observe a prominent pillar in one simulation which is the remains of an accretion flow feeding the central ionizing cluster of its host cloud and suggest that this may be a general formation mechanism for pillars such as those observed in M16. We find that the association of stars with structures in the gas such as shells or pillars is a good but by no means foolproof indication that those stars have been triggered and we conclude overall that it is very difficult to deduce which objects have been induced to form and which formed spontaneously simply from observing the system at a single time.Peer reviewe
Axiomatic definition of valid 3D parcels, potentially in a space partition
No full textThe definition of a valid 3D parcel must be correct and unambiguous, because an error or ambiguity in the definition of the extent of a property can lead to expensive legal disputes or to problems with handling 3D parcels in the information systems or problems during data transfer between two systems. This paper develops a rigorous axiomatic definition of a 3D parcel, and its relationship with adjoining parcels within a space partition. Since the requirements of different jurisdictions mandate different levels of validation, some of the axioms are identified as optional. For example, a jurisdiction may require that a parcel must be contiguous, while another may not require this. In earlier publications the axioms concerning valid 3D parcels (within a partition) are formulated in natural language. In this paper we will further formalize this by using mathematical expressions. We also want to prove the necessity of all axioms, i.e. is our set of axioms minimal or are they perhaps overlapping? We show that one of the earlier proposed axioms (A4) is implied by axiom A5 (see discussion in section 3.3) and can be omitted. In order to demonstrate the necessity and independence of the remaining set of axioms, a series of test cases is presented. Each case violates a single axiom and passes all other axioms, thus showing that the set of axioms is non-redundant. In addition, real examples of 3D parcels (From Queensland, Australia), are tested against the validation suite.OTB ReseachOTB Research Institute for the Built Environmen
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
"It will never be my first choice to do an online course": Examining experiences of Indigenous learners online in Canadian post-secondary educational institutions
Full text linkIn the era of Truth and Reconciliation (TRC), educational administrators have a responsibility to answer the Calls to Action to transform post-secondary education, to increase access for Indigenous learners and decreasing education disparity between Indigenous and non-Indigenous learners (TRC, 2015a). If distance education is an option for expanding educational opportunities, online learning environments should be scrutinized to ensure learner engagement and meaningful support for Indigenous students. This thesis uses a Community of Inquiry (CoI) (Garrison, Anderson & Archer, 2000) framework to examine existing literature and to frame the voices of 21 Indigenous participants about their experiences of supports, preferences, and online best practices. By exploring, understanding and incorporating what may be unique preferences, cultures, languages, worldviews, and ways of knowing, mechanisms to transform distance learning environments to improve engagement for Indigenous students can be identified. With the aim of synthesizing potential findings with online best practices, it may be possible to transform online delivery and development to provide a rich educational experience for students.Indigenous learnerspost-secondaryonline learningdistance educationCoIcommunity of inquiryIndigenous educatione-learningstudent supportstudent retentio
More than just a meal: Community and social justice approaches to food security in Kamloops, British Columbia
No full textKamloops, British Columbia (BC) is a rural city situated on Tk'emlúps te Secwépemc within Secwepemcúĺecw, the traditional and unceded territory of the Secwépemc peoples. For thousands of years, the Secwépemc peoples have studied and managed the fragile ecosystems within the region sustaining themselves on local and wild foods. Regional Indigenous knowledge was passed from one generation to the next until the exchange was interrupted by the arrival of colonial-settlers. Consequently, many individuals are now disconnected from the land and lack necessary food literacy and skills. This study examines how historical and contemporary
inequalities reinforce food insecurity in the local Kamloops food system. Significant barriers to
food security in the region, such as neoliberal economic systems and forms of institutionalized
racism, are identified through volunteer work, participant observation and 25 semi-structured
interviews with individuals involved in the local food community. A community-based
participatory research methodology was used to guide this research. This research also explores
existing opportunities to strengthen food security through grassroots activism in the community.
The results of this study inform local policy to improve food security and identify the
inequalities embedded in regional food systems.community food securityfood justicesocial inequalitiesgrassroots food activismfood security stakeholdersfood literacyracismneoliberalis
"It will never be my first choice to do an online course": Examining experiences of Indigenous learners online in Canadian post-secondary educational institutions
Full text linkIn the era of Truth and Reconciliation (TRC), educational administrators have a responsibility to answer the Calls to Action to transform post-secondary education, to increase access for Indigenous learners and decreasing education disparity between Indigenous and non-Indigenous learners (TRC, 2015a). If distance education is an option for expanding educational opportunities, online learning environments should be scrutinized to ensure learner engagement and meaningful support for Indigenous students. This thesis uses a Community of Inquiry (CoI) (Garrison, Anderson & Archer, 2000) framework to examine existing literature and to frame the voices of 21 Indigenous participants about their experiences of supports, preferences, and online best practices. By exploring, understanding and incorporating what may be unique preferences, cultures, languages, worldviews, and ways of knowing, mechanisms to transform distance learning environments to improve engagement for Indigenous students can be identified. With the aim of synthesizing potential findings with online best practices, it may be possible to transform online delivery and development to provide a rich educational experience for students.Indigenous learnerspost-secondaryonline learningdistance educationCoIcommunity of inquiryIndigenous educatione-learningstudent supportstudent retentio
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
