Geospatial Units Research Articles

A freshwater ecoregion delineation approach based on freshwater macroinvertebrate community features and spatial environmental data in Taizi River Basin, northeastern China

AbstractThe ecoregion is currently widely used as the basic geospatial unit in freshwater biodiversity conservation. The popularly used delineation is usually based on the assumption that attributes of aquatic ecosystems are influenced by landscape‐scale environmental variables. However, few ecoregion delineations attempt to establish the local validity of this assumption prior to delineation, and few studies check the correspondence of the derived ecoregion boundaries with the distributions of attributes of aquatic biota. In this study, we established an approach to overcome these shortcomings. The notable features of the approach are: (1) the delineation variables were filtered through a series of analytical steps to select those that best represented the aquatic community traits, and which avoided redundancy in the data; (2) the method was quantitative and repeatable; and (3) the derived ecoregion boundaries were checked for consistency with the spatial attributes of aquatic biota. The approach was applied in the Taizi River Basin, northeast China. The procedure proposed here filtered out altitude and annual precipitation as the best variables to include in the freshwater ecoregion delineation. Then, using the quantitative ISODATA classification method, the basin was classified into three ecoregions. A test of accuracy indicated that freshwater ecoregions matched well with the spatial distribution pattern of macroinvertebrate community attributes. Statistical analysis showed that natural geographical attributes and river attributes were different in the three ecoregions, and indices representing macroinvertebrate community attributes are significantly different as a whole among the three ecoregions. The case study proved this approach effective on ecoregion delineation.

A Human Centered GeoVisualization framework to facilitate visual exploration of telehealth data

Purpose: Public health data is typically organized by geospatial units. Routine geographic monitoring of health data enables an understanding of the spatial patterns of events in terms of causes an...

A Human Centered GeoVisualization framework to facilitate visual exploration of telehealth data: A case study

Public health data is typically organized by geospatial units. Routine geographic monitoring of health data enables an understanding of the spatial patterns of events in terms of causes and controls. GeoVisualization (GeoVis) allows users to see information hidden both visually and explicitly on a map. Despite the applicability of GeoVis in public health, it is still underused for visualizing public health data. The objective of this study is to examine the perception of telehealth users' to utilize GeoVis as a proof of concept to facilitate visual exploration of telehealth data in Brazil using principles of human centered approach and cognitive fit theory. A mixed methods approach combining qualitative and quantitative assessments was utilized in this cross sectional study conducted at the Telehealth Center of the Federal University of Pernambuco (NUTE-UFPE), Recife, Brazil. A convenient sample of 20 participants currently involved in NUTES was drawn during a period of Sep-Oct 2011. Data was gathered using previously tested questionnaire surveys and in-person interviews. Socio-demographic Information such as age, gender, prior education, familiarity with the use of computer and GeoVis was gathered. Other information gathered included participants' prior spatial analysis skills, level of motivation and use of GeoVis in telehealth. Audio recording was done for all interviews conducted in both English and Portuguese, and transcription of the audio content to English was done by a certified translator. Univariate analysis was performed and means and standard deviations were reported for the continuous variables and frequency distributions for the categorical variables. For the open-ended questions, we utilized a grounded theory to identify themes and their relationship as they emerge from the data. Analysis of the quantitative data was performed using SAS V9.1 and qualitative data was performed using NVivo9. The average age of participants was 28 years (SD=7), a majority of them were females and 100% were professionals with graduate degrees. The users had diverse backgrounds including nursing, computer science, biomedical informatics, statistics, dentistry, administration and engineering. The users had varied roles and responsibilities, used computers frequently but only 5% of them were familiar with GeoVis. Google maps were the most common GeoVis application that the users were familiar with. Despite having minimal spatial skills, there was a strong motivation and relevance among the telehealth users to use GeoVis to facilitate visual exploration of telehealth data for better informed decision making. Results also showed that of the 60% participants with no GeoVis familiarity; 33% had moderate to large data exploratory role, 83% had no spatial skills but 58% preferred analyzing both spatial and temporal dimensions of the data. Majority of the participants agreed to have maps as the first choice to represent the data as it will be able to display the events both in place and time. The results demonstrate a potentially growing need for the use of GeoVis applications to evaluate telehealth data. Understanding of user needs is essential to ensure that the technology is appropriately functional and will be useful to complete the tasks.

Designing Human Centered GeoVisualization application – the SanaViz – for telehealth users: A case study

Public health data is typically organized by geospatial unit. GeoVisualization (GeoVis) allows users to see information visually on a map. Examine telehealth users' perceptions towards existing public health GeoVis applications and obtains users' feedback about features important for the design and development of Human Centered GeoVis application "the SanaViz". We employed a cross sectional study design using mixed methods approach for this pilot study. Twenty users involved with the NUTES telehealth center at Federal University of Pernambuco (UFPE), Recife, Brazil were enrolled. Open and closed ended questionnaires were used to gather data. We performed audio recording for the interviews. Information gathered included socio-demographics, prior spatial skills and perception towards use of GeoVis to evaluate telehealth services. Card sorting and sketching methods were employed. Univariate analysis was performed for the continuous and categorical variables. Qualitative analysis was performed for open ended questions. Existing Public Health GeoVis applications were difficult to use. Results found interaction features zooming, linking and brushing and representation features Google maps, tables and bar chart as most preferred GeoVis features. Early involvement of users is essential to identify features necessary to be part of the human centered GeoVis application "the SanaViz".

Mineralization of the surface waters in the Visocica drainage basin: Supplement for the landscape-ecologic analysis

The drainage basin is spatially and functionally clearly defined and relevant hydrologic, geomorphologic and ecologic landscape totality. Therefore, it mostly represents basic geo-spatial unit of generation, monitoring, and studying numerous physical-geographical and geo-ecologic occurrences and processes. One of the most important components of geo-space, on the level of basin, is manifested through the state and quality of surface waters. So, the acceptance of systematic approach in studying mineralization of the surface waters would contribute to the deeper understanding of the process in complex systematic surroundings which drainage basin represents. The Visocica Drainage Basin was chosen as proving ground of this kind of the research approach for several reasons. The highest specific runoff on the territory of Eastern Serbia, heterogeneous geologic structure of terrain, almost complete absence of the influence of the anthropogenic factor on the state of the environment, as well as the existence of water accumulation enabled perception of the values of dissolved mineral substances of surface waters as landscape-ecologic component of geo-space.

Human values and social identities: A study in two collectivist cultures

The current study examines the value correlates of social identities (identification with in‐groups and geospatial units) in two collectivist cultures (Brazil, n = 471; Spain, n = 476). According to previous research, it was expected that subjects who score higher on social values would be more identified with the various traditional in‐groups and with the local geospatial units and that social identities would be predicted by different values among Brazilians and Spaniards. Subjects were undergraduate students (228 males; 719 females), with age ranging from 16 to 55 years (M = 21.9; SD = 4.57), from three states in Brazil (Paraíba, Distrito Federal, and São Paulo) and Spain (Pontevedra, Madrid, and Barcelona). They were administered the Individualism‐CollectivismQuestionnaire, the Basic Value Survey, the In‐group Identification Scale, the Geospatial Identification Scale, and a questionnaire with demographic questions (e.g., gender, age, religious affiliation). Results confirm that importance attributed to social values is correlated with traditional in‐group and local geospatial identification, and that values predicting social identities are different across cultures, especially in the case of values related to geospatial identification. Specifically, among the set of social human values, belonging and tradition were most important to explain social identities. Subjects that assigned more importance to privacy were less identified with traditional ingroups, independently of their national culture. Geospatial identification was based on the values religiosity and belonging for Brazilians, and tradition, social order, honesty, and power for Spaniards. In general, these findings corroborate previous ones, suggesting the existence of a common set of values to explain social identity, based on principally normative values (social order and tradition). Moreover, they indicate the specificity and complexity of the geospatial identification in Spain, where the values of honesty and power contribute to explaining it. In this country, it is possible that the determinants of geospatial identification surpass the social orientation endorsed by people.

NEW APPROACHES TO DELINEATING METROPOLITAN AND NONMETROPOLITAN SETTLEMENT: GEOGRAPHERS DRAWING THE LINE

The federal government's Office of Management and Budget, with staff support from the Census Bureau's Population Division, is responsible for maintaining the statistical standard that provides criteria used to define metropolitan settlement and that delineates individual metropolitan areas for use in federal statistics. Review of the current standard, which dates from 1990, is now under way in conjunction with the 2000 census. Reviews of the emergence of the metropolitan form of settlement in the United States and of previous geospatial units representing metropolitan settlement are provided. A framework of geospatial units to represent the various elements of settlement at the close of the 20th century, including metropolitan and nonmetropolitan forms, is offered. Three papers that provide new approaches to delineating metropolitan and nonmetropolitan settlement in the United States are introduced. [Keywords: metropolitan and nonmetropolitan settlement, geospatial units of analysis, federal government, statistics.]