Day: July 28, 2010

A GIS Analysis of Climate Change and Snowpack on Columbia Basin Tribal Lands

/ Matt Artz

Ecological Restoration, 27(3):256-257 (2009)

David Graves

“”A robust snowpack is the most important factor for the delivery of cool and consistent stream flows throughout the year in the Pacific Northwest, but it is at risk of depletion in an era of climate change. Most of the region’s precipitation falls during the cool months between autumn and spring, historically as snow in upland areas. There it exists as a frozen reservoir that, as it melts, sustains flows during the dry months of late spring and summer. With increasing air temperatures anticipated from 21st century climate change, many of these upland areas in the Pacific Northwest may receive more rain and less snow, leading to increasing flooding during the winter months and lower stream flows during the summer months, when water is needed most for competing economic and ecological uses (Mote et al. 2003, ISAB 2007). The Indian tribes of the Columbia River Basin are interested in how these conditions may change because seasonal stream flows are critically important to salmon (Oncorhynchus tshawytscha, O. keta, O. kisutch, and O. nerka) and steelhead (O. mykiss), and they are also important to other traditional food resources of the tribes such as lamprey (Lampetra tridentata), sturgeon (Acipenser transmontanus), deer (Odocoileus spp.) and other big game, biscuit root (Lomatium cous) and other roots, and berries.

http://www.critfc.org/tech/climate/Graves_ER27-3_pp256-257.pdf

New Edition of Modeling Our World Now Available from Esri Press

/ Matt Artz / 1 Comment

Book Provides Updated Information on Geodatabase Model

Modeling Our World: The ESRI Guide to Geodatabase Concepts from Esri Press is a comprehensive work that explains the fundamental geographic information concepts underlying the geodatabase model and its use. The fully revised second edition reflects the new features and functionality available in ArcGIS 10.

The book details the use of geodatabase structural elements to ensure spatial and attribute integrity in data modeling and geographic analyses. In addition, it explains how to manage an organization’s workflow and provides strategies to scale geodatabases from small projects up to multiple departments across a large organization.

“Professional GIS [geographic information system] users have the role of creating and managing authoritative geographic information. This second edition of Modeling Our World is about enabling those GIS practitioners to implement efficient, effective, and elegant systems,” says Clint Brown, Esri’s director of software products.

Author Michael Zeiler is a systems designer for Esri with more than 20 years of experience diagramming GIS concepts, building data models, and programming. Zeiler authored the first edition of Modeling Our World, as well as Inside ARC/INFO, published by OnWord Press in 2000.

Modeling Our World: The ESRI Guide to Geodatabase Concepts, Second Edition (ISBN-13: 978-1-58948-278-4, 312 pages, $44.95), is available at online retailers worldwide, at www.esri.com/esripress, or by calling 1-800-447-9778. Outside the United States, visit www.esri.com/esripressorders for complete ordering options or visit www.esri.com/distributors to contact your local Esri distributor. Interested retailers can contact Esri Press book distributor Ingram Publisher Services.

[Source: Esri press release]

Estimating Similarity of Communities: A Parametric Approach to Spatio-temporal Analysis of Species Diversity

/ Matt Artz

Ecography, Published Online 20 July 2010

Steinar Engen, Vidar Grøtan and Bernt-Erik Sæther

“Several stochastic models with environmental noise generate spatio-temporal Gaussian fields of log densities for the species in a community. Combinations of such models for many species often lead to lognormal species abundance distributions. In spatio-temporal analysis it is often realistic to assume that the same species are expected to occur at different times and/or locations because extinctions are rare events. Spatial and temporal β-diversity can then be analyzed by studying pairs of communities at different times or locations defined by a bivariate lognormal species abundance model in which a single correlation occurs. This correlation, which is a measure of similarity between two communities, can be estimated from samples even if the sampling intensities vary and are unknown, using the bivariate Poisson lognormal distribution. The estimators are approximately unbiased, although each specific correlation may be rather uncertain when the sampling effort is low with only a small fraction of the species represented in the samples. An important characteristic of this community correlation is that it relates to the classical Jaccard- or the Sørensen-indices of similarity based on the number of species present or absent in two communities. However, these indices calculated from samples of species in a community do not necessarily reflect similarity of the communities because the observed number of species depends strongly on the sampling intensities. Thus, we propose that our community correlation should be considered as an alternative to these indices when comparing similarity of communities. We illustrate the application of the correlation method by computing the similarity between temperate bird communities.”

Trajectories of Land Use Change in Europe: A Model-based Exploration of Rural Futures

/ Matt Artz

Landscape Ecology 25(2): 217-232

Peter H. Verburg, Derek B. van Berkel, Anne M. van Doorn, Michiel van Eupen, and Harm A. R. M. van den Heiligenberg

“Land use change is characterized by a high diversity of change trajectories depending on the local conditions, regional context and external influences. Policy intervention aims to counteract the negative consequences of these changes and provide incentives for positive developments. Region typologies are a common tool to cluster regions with similar characteristics and possibly similar policy needs. This paper provides a typology of land use change in Europe at a high spatial resolution based on a series of different scenarios of land use change for the period 2000–2030. A series of simulation models ranging from the global to the landscape level are used to translate scenario conditions in terms of demographic, economic and policy change into changes in European land use pattern. A typology developed based on these simulation results identifies the main trajectories of change across Europe: agricultural abandonment, agricultural expansion and urbanization. The results are combined with common typologies of landscape and rurality. The findings indicate that the typologies based on current landscape and ruralities are poor indicators of the land use dynamics simulated for the regions. It is advocated that typologies based on (simulated) future dynamics of land change are more appropriate to identify regions with potentially similar policy needs.”

Enterprise License Agreement Extends GIS Success for City of Philadelphia

/ Matt Artz

Helps More Departments Improve Work, Spur New Services, and Reduce Costs

The City of Philadelphia, Pennsylvania, is taking advantage of Esri’s enterprise license agreement (ELA) program to supply more departments and government workers with geographic information system (GIS) software. As a result, many city departments are now building and sharing their data, applications, and services. The new GIS applications and data help the city work more effectively to give its citizens improved services. The ELA will also help reduce costs over the next several years.

“The ELA has been instrumental in expanding GIS use across the city, especially in a time of tight budgets,” says James L. Querry, director of enterprise GIS, City of Philadelphia Division of Technology. “The agreement extends the benefits of GIS by allowing departments to produce data and perform geospatial analysis themselves. It also gives them the ability to implement critical systems, such as Cityworks’ GIS-based asset and work order management, to improve the city’s ability to deliver services faster and more effectively.”

Esri offers ELAs for all types of organizations including commercial firms and federal, state, regional, and local government agencies as well as low-cost ELAs for smaller local governments and utilities.

The Esri ELA program gives Philadelphia a cost-effective way to deploy and extend GIS into a wide array of business processes. It enables city staff to efficiently manage further GIS expansion for delivering business value throughout the entire organization. As a result, more departments use GIS analysis as part of their daily operations. In many cases, these departments can easily use the software as part of their workflow rather than soliciting GIS data and analysis services from the city’s central GIS group within the Division of Technology.

Several new projects have resulted from the deployment of the ELA. These include

Free GIS-based iPhone application—This allows people to report a problem immediately using the convenience of an iPhone. They can take photos of an issue—such as a downed streetlight or debris blocking a road—and send the geotagged picture directly to the city’s 311 system. It’s then immediately routed to the appropriate city department.

3D Cities initiative—Using sophisticated guidance systems, lidar sensors, oblique imagery, spherical imagery, and other data sources, the agency is piloting a 3D model of downtown Philadelphia. It includes a 3D surface model, as well as building interiors and belowground transit corridors with extremely accurate representations, displayed using GIS. The modeling will assist with a number of services, from responding to an underground emergency to planning future growth.

PhillyStat—Based on the Baltimore, Maryland, CitiStat system, PhillyStat is a performance-based management methodology that takes advantage of GIS data, maps, and analysis to continually improve the quality of services provided to the citizens of Philadelphia. It evaluates policies and procedures practiced by city departments for delivering all manners of urban services, from criminal investigation to pothole repair.

[Source: Esri press release]

A Spatio-temporal Climate-based Model of Early Dengue fever Warning in Southern Taiwan

/ Matt Artz

Stochastic Environmental Research and Risk Assessment, published online July 17, 2010

Hwa-Lung Yu, Shang-Jen Yang, Hsin-Ju Yen, and George Christakos

“Dengue Fever (DF) has been identified by the World Health organization (WHO) as one of the most serious vector-borne infectious diseases in tropical and sub-tropical areas. During 2007, in particular, there were over 2,000 DF cases in Taiwan, which was the highest number of cases in the recorded history of Taiwan epidemics. Most DF studies have focused mainly on temporal DF patterns and its close association with climatic covariates, whereas they have understated spatial DF patterns (spatial dependence and clustering) and composite space–time effects. The present study proposes a spatio-temporal DF prediction approach based on stochastic Bayesian Maximum Entropy (BME) analysis. Core and site-specific knowledge bases are considered, including climate and health datasets under conditions of uncertainty, space–time dependence functions, and a Poisson regression model of climatic variables contributing to DF occurrences in southern Taiwan during 2007. The results show that the DF outbreaks in the study area are highly influenced by climatic conditions. Furthermore, the analysis can provide the required “one-week-ahead” outbreak warnings based on spatio-temporal predictions of DF distributions. Therefore, the proposed approach can provide the Taiwan Disease Control Agency with a valuable tool to timely identify, control, and even efficiently prevent DF spreading across space–time.”

The Implementation of International Geospatial Standards for Earth and Space Sciences

/ Matt Artz

International Journal of Digital Earth, Volume 3, Issue S1 April 2010 , pages 2 – 13

Stefano Nativi

“The Earth and Space Sciences Informatics division of European Geosciences Union (EGU) and the Open Geospatial Consortium jointly organised a special event entitled: ‘Implementation of international geospatial standards for earth and space sciences event’ – at the EGU General Assembly meeting held in Vienna, April 2009. The event objectives included: (a) to discuss the integration of information systems from different geosciences disciplines; (b) to promote and discuss the present process to scale from specific and monolithic systems towards independent and modular enabling infrastructures – forming an earth system science (ESS) infrastructure; and (c) to show some of the latest advances in implementing open standards. This manuscript introduces the event motivations and describes the abstract and holistic framework, which can be used to situate the topics and the developments presented by the event speakers. This manuscript introduces important, and relatively new technologies to build a multi-disciplinary geosciences information system: the System of Systems approach and the Model Driven Approach. To achieve that, three important information infrastructure categories are recognised: (a) ESS information infrastructure; (b) geospatial information infrastructure; and (c) distributed information infrastructure. Digital Earth should support the discussed framework to accelerate information transfer from theoretical discussions to applications, in all fields related to global climate change, natural disaster prevention and response, new energy-source development, agricultural and food security, and urban planning and management.”