Search Results (1 - 2 of 2 Results)

Sort By  
Sort Dir
 
Results per page  

Whalen, Kevin ChristopherA map system to disseminate national science on forests for the creation of regional tree planting prioritization plans
MS, Kent State University, 2017, College of Arts and Sciences / Department of Computer Science
In the United States, urban forestry efforts are sustained through efforts from individuals, businesses, philanthropic organizations, and government agencies across local, state, and national levels. The i-Tree Tools suite of software promotes the use of, peer-reviewed science to explain the benefits that trees provide in a method intended for the general public. This thesis shares the computer-specific knowledge collected during the design, implementation, and continued expansion of i-Tree Landscape. The i-Tree Landscape application is a web-browser based, online, geographic information system, referred to as a web-GIS app. The "pages" of the web-app are part of a system of software libraries and services, along with dedicated hardware, which were specifically researched, compared, selected, and optimally configured for their roles in supporting the system as a whole. This work will also briefly touch upon the open source libraries and services running in the Landscape system, as well as, some of the decisions they influenced with acquiring hardware to support its deployment. Delivering the data and formulas associated with the benefits of trees for the entire geographic area of the United States becomes difficult over the internet, especially when it must be achieved via a non-expert interface. To manage this, the flow of the application is separated into five, non-sequential steps, prefixed with a landing page, and postfixed with a publishable report. This partitioning helps with code responsibility separation, as well. In addition to producing a tailorable report for describing the benefits of trees, the primary purpose of the application is to help prioritize tree planting efforts. This is well needed by foresters to help allocate for popular practice of mass tree plantings. The planning is done via a customizable model utilizing nearly all of the possible attributes as weighting options. The regional aggregations for this are available to users through nine boundary layers, most notably including counties, block groups, and watersheds. The research supporting the data on trees is from working directly with the authors of peer-reviewed research from the United States Department of Agriculture Forest Service laboring at the Northern Research Station at the College of Environmental Science and Forestry in Syracuse, New York. i-Tree Landscape has succeeded in becoming a science dissemination facility, by the use of information visualization, with the purpose of making decisions that promote urban forestry stewardship through modern web-GIS, and data processing techniques.

Committee:

Cheng-Chang Lu, PhD (Advisor); Austin Melton, PhD (Committee Member); Gokarna Sharma, PhD (Committee Member)

Subjects:

Computer Science; Ecology; Environmental Science; Geography; Urban Forestry; Urban Planning

Keywords:

budget national map processing; geographic information system; GIS; national land cover; forestry; tree planting prioritization; GDAL; GEOS; GeoServer; PostGIS; JTS; Open Geospatial Consortium; OGC; Open Source Geospatial Foundation; OSGeo;

Chen, WeiThe Design and Implementation of a Web-based GIS for Political Redistricting
Master of Arts, The Ohio State University, 2009, Geography

The World Wide Web (www) has dramatically changed our way of producing, utilizing and consuming information, especially geospatial information in recent years. Web-based GIS (Geographic Information Systems) are designed to provide Web users analytical tools to assist their spatial decisions making process. With the advantages such as platform independence, customizability and cost effectiveness, Open Source Geospatial (OSGEO) software has been more adopted to develop Web-based GIS applications. Also, the increased availability of spatial functionalities in OSGEO software has opened many possibilities towards the implementation of a more powerful, interactive and collaborative Web-based GIS platform which is favorably referred to as the GeoWeb. However, compared with proprietary systems current open source based online GIS systems have several limitations. For example, most of them do not provide customizable web mapping service and spatial data processing service. However, these two types of services are essential to effectively filter spatial information and explore area of interest.

This research introduces a framework of implementing a Web-based GIS using Open Source Software, including Postgresql/PostGIS, MapServer, and OpenLayers. On the server side, Postgresql/PostGIS is used to store and process spatial data. MapServer is adopted to provide Web Mapping Service (WMS). Server side scripting language PHP is employed to dynamically generate map file from PostGIS for MapServer to render. On the client side, OpenLayers provides the programming interface to incorporate layers from different data sources into a same DOM container. Web-based GIS for political redistricting, as an example, has been developed to demonstrate both merits and demerits of adopting this framework.

Initial results of the demonstration show that the integration of PostGIS, MapServer and PHP could facilitate query based map generation and make mapping of massive spatial data efficient. Query based Web Mapping Service is capable to dynamically generate map and legend images. Spatial data handling functions in PostGIS are suitable for developing user interactive functions for querying, measuring and processing spatial data. Users could use the implemented Web-based political redistricting GIS to explore census, devise and evaluate new plan, and compare different plans. This framework based on open environment can be adapted to applications with similar requirements. The application implemented in this research can be access through gis.osu.edu/redistricting.

Committee:

Ningchuan Xiao (Advisor); Mei-Po Kwan (Committee Chair); Daniel Sui (Committee Member)

Subjects:

Computer Science; Geography; Information Systems; Political Science

Keywords:

Web-based GIS; Political Redistricting; Open Source Geospatial (OSGEO); Public Participation