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Zook et al. Haiti Relief & VGI

12 November 2017 - 10:37pm
Volunteered Geographic information is tool used to consolidate knowledge where it is needed by those willing to offer their data and expertise. I feel comfortable arguing that it is strictly a tool; it create no new process or analysis of information but simply refers to consolidation of knowledge to complete various projects. The project in […]

Dunn and Newton (1992)

12 November 2017 - 5:09pm
This paper discusses two prominent forms of network analysis: Dijkstra’s shortest path analysis, and off-kilter network analysis. Dijkstra’s algorithm presents a very simple form of network analysis by regarding the path from point A to point B through a series of nodes and arcs, which are accounted simply by length. Indeed, the authors make a […]

Network Analysis (Curtin 2007)

12 November 2017 - 4:57pm
I found this article quite interesting, in both its recap of traditional Network analyses (i.e. Djikstra’s formula) as well as how the network features of GIS are some of GIScience’s earliest and most popular uses. I find the point on how Graph Theory is ultimately the thought holding this immense function together. On this train […]

Optimal routes in GIS and Emergency Planning, Dunn & Newton (1992)

12 November 2017 - 4:12pm
Dunn and Newton (1992) examine the performance of two popular approaches to network analysis, Dijkstra’s and out-of-kilter algorithms, in the context of population evacuation. At the time of publication, it’s clear that the majority of network analysis research has been conducted by computer scientists and mathematicians. It’s interesting how historical conceptualizations of networks, which appear […]

VGI and Crowdsourcing Disaster Relief, Zook et al. (2010)

12 November 2017 - 2:37pm
Zook et al. (2010) describe the ways in which crowdsourced VGI was operationalized through the 2010 earthquake in Haiti, with emphasis on the response organized by CrisisCamp Haiti, OpenStreetMap, Ushahidi, and GeoCommons. The authors refer to the principle that “given enough eyeballs, all bugs are shallow” in deference of the suitability of crowdsourced VGI. It’s […]

Thoughts on “Network Analysis in Geographic Information Science…” Curtis 2007

12 November 2017 - 2:15pm
I came into this paper not knowing too much about network analysis, but having some general notion of it through its ubiquity in geographic and neuroscience literature (network distance, social networks, neural networks). I thought the paper did a good job of outlining the fundamentals of the field before progressing into geographic specificities and future […]

Thoughts on “Assuring the quality of…”Goodchild 2012

12 November 2017 - 12:40pm
In discussing methods to assure the quality of VGI, Goodchild states that; “The degree to which such triage can be automated varies; in some cases it might be fully automatic, but in other cases it might require significant human intervention.” In VGI, the source of the data is human (as opposed to a scraping algorithm […]

Curtin (2013) – Networks in GIScience

12 November 2017 - 3:42am
Curtin (2013) calls on the Geographic Information Science (GISc) community to seize the opportunities surrounding network analysis in geographic information systems (GIS). If GISc researchers and GIS developers can sufficiently integrate networks into existing theoretical frameworks, construct robust methods and design compatible softwares, they could exert a strong geographically-minded influence on the expansion of network […]

Goodchild and Li (2012) – Quality VGI

12 November 2017 - 12:41am
Goodchild and Li (2012) outline crowd-sourcing, social and geographic approaches to quality assurance for volunteered geographic information (VGI). Representing an increasingly important resource for data acquisition, there is a need to create and interrogate the frameworks used to accept, query or reject instances of VGI on the basis of its accuracy, consistency and completeness. The […]

Curtin 2007: Network Analysis in GIS

12 November 2017 - 12:06am
Network analysis is very useful for showing relationships between objects/agents/people and does not require some of the more formal geographic foundations. The result is the formation and growth of informal and natural linkages to create complex systems which can model how things are connected to each other. It essentially provides an alternative to geographic datum […]

Thoughts on Goodchild (2012)

11 November 2017 - 2:57pm
Goodchild does a thorough job assessing the benefits and hindrances of his three methods for quality assurance of VGI. His first two, the crowd-sourcing approach and the social approach, he evaluates in comparison to Wikipedia contribution. Goodchild failed to specify a few important details of the social approach. Ideally Wikipedia contributions are made by users […]

Volunteered Geographic Information and Crowdsourcing Disaster Relief: A Case Study of the Haitian Earthquake, Zook et al. (2010)

11 November 2017 - 10:57am
This article by Zook et al. (2010) talks about VGI specifically in the context of the 2010 Earthquake in Haiti, but more broadly discusses many of the issues presented in Goodchild and Li (2012) regarding the accuracy and validity VGI. I think Zook et al. (2010) do a good job of considering many aspects of […]

Network analysis in GIS (Curtin, 2007)

10 November 2017 - 4:33pm
I found it very interesting how Curtin (2007) points out that network analysis is the only subfield of GISciences that has redefined a spatial reference system. Linear referencing, or using the network itself as a reference, is so intuitive that I had never thought of it as an alternative method of spatial referencing. I realize […]

Curtin (2007)

10 November 2017 - 1:15pm
As with many of the topics covered in class, though I have used network analysis, I never read much background on the subject, because I mostly used it as a tool in various GISystems applications. For instance, I had not ever thought of the origin of the shape file, or some of the positive/negative attributes […]

On Dunn & Newton (1992) and early 1990s Network Analysis

9 November 2017 - 6:30pm
Dunn & Newton’s article “Optimal Routes in GIS and Emergency Planning Applications” (1992) heavily discusses the mathematics behind the Djikstra algorithm & its spin-off, the “out-of-kilter” algorithm, and the “out-of-kilter” algorithm’s use in early ‘90s GISoftware and on early ‘90s computers. The “out of kilter algorithm” that diverts in multiple paths for an increased flow from one […]

On Goodchild & Li (2012) and Validation in VGI

9 November 2017 - 4:17pm
I thought that this article “Assuring the quality of volunteered geographic information” was super interesting. Encompassing the evolution of “uncertainty” in GIScience was interesting, and a welcome addition as a segue into the three approaches into quality assurance (crowd-sourcing, social, and geographic). Exploring the social approach further, it stipulates that there will always be a […]

Thoughts on assuring the quality of VGI (Goodchild and Li, 2012)

9 November 2017 - 3:16pm
I think that the most important thing to note from Goodchild and Li’s article on assuring the quality of VGI is that his proposed approaches are only applicable to VGI that is “objective and replicable.” This is to say that he is discussing VGI which attempts to capture the truth of a particular geographic phenomena […]

Ester et al 1997 – Spatial data mining

6 November 2017 - 12:13am
The broad goal of knowledge discovery in databases (KDD) is, fittingly, to construct knowledge from large spatial database systems (SDBS). This goal is achieved via spatial data mining methods (algorithms) which are used to automate KDD tasks (e.g. detection of classes, dependencies, anomalies). Without a fuller understanding of the field at present, it is hard […]

Spatial Data Mining: A Database Approach, Ester et al. (1997)

5 November 2017 - 11:31pm
Ester et al. (1997) propose basic operations used for knowledge discovery in databases (KDD) for spatial database systems. They do so with an emphasis on the utility of neighbourhood graphs and neighbourhood indices for KDD. When the programming language began to bleed into the article it was clear that maybe some of the finer points […]

On Ester et al (1997)’s Spatial Data Mining in Databases

5 November 2017 - 3:55pm
In their article “Spatial Data Mining: A Database Approach” (1997), Ester et al outlined the possibility of knowledge discovery in databases (KDD) using spatial databases, utilizing four algorithms (spatial association, clustering, trends, and classification). Unfortunately, the algorithms are not entirely connected to how one mines spatial information from databases, and the algorithms introduced don’t seem […]