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National Hospital Available Beds for Emergencies and Disasters (HAvBED) System

Public Health Emergency Preparedness

This resource was part of AHRQ's Public Health Emergency Preparedness (PHEP) program, which was discontinued on June 30, 2011, in a realignment of Federal efforts.

This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: https://info.ahrq.gov. Let us know the nature of the problem, the Web address of what you want, and your contact information.

Please go to www.ahrq.gov for current information.

Appendix I. Geographic Information System (GIS) Documentation

Purpose of This Document

The purpose of this document is to provide necessary information required to properly document, deploy, and host a Geographic Information System (GIS) created as part of the operating of the National Available Beds for Emergencies and Disasters (HAvBED) system as implemented at Denver Health and Hospital Authority.  It is limited to hardware, software, and database specifications.

Contents

1. Introduction
   1.1. Objectives
   1.2. Scope
   1.4. References/Attachments
2. Application Name

2.1. Application Narrative/Overview
   2.2. High Level Application Architecture
   2.3. Schematic Diagram of the Application
   2.4. Application Profile
      2.4.1. DNS Requirements
      2.4.2. SSL Requirements
      2.4.3. Firewall Ports Requirements
      2.4.4. Hardware
   2.5. Contacts
      2.5.1. Technical Contacts
3. Operations Guide
   3.1. Application Components
   3.2. Backup/Restore Requirements
4. System Administration Guide
   4.1. Configuration Parameters
   4.2. GIS Data
      4.2.1. GIS Data Details
5.1. Future Recommendations Narrative/Overview

1. Introduction

1.1. Objectives

This document describes software, database architecture, and hardware configuration for the HAvBED GIS application.

Return to Appendix I Contents

1.2. Scope

This document is focused on the HAvBED GIS details.

Return to Appendix I Contents

1.4. References/Attachments

  • ArcIMS9 Architecture and Functionality, ESRI
    http://www.esri.com/library/whitepapers/pdfs/arcims9-architecture.pdf
  • Install IIS 6.0 with Tomcat 4.1.29 using J2SDK 1.4.2 for ArcIMS 9.0 on Windows 2003, ESRI
    http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=25867
  • Identifying Firewall TCP Server Ports In a Enterprise ArcIMS Configuration, ESRI
    http://www.esri.com/systemsint/kbase/docs/arcims_tcp_port_tb_rev2.pdf
  • Configure ArcIMS to work with HTTPS, ESRI
    http://support.esri.com/index.cfm?fa=knowledgebase.techArticles.articleShow&d=21669
  • Customizing ArcIMS—Using the ActiveX Connector, ESRI, Software Documentation Library for ArcGIS 9.
  • Managing ArcSDE Application Servers, ESRI, Redlands, CA, 2004.
  • ArcSDE Developer Help, http://edndoc.esri.com/arcsde/9.1

Return to Appendix I Contents

2. Application Name

2.1. Application Narrative/Overview

The HAvBED system is a national hospital bed-tracking tool which was implemented as an internet-based system available for secure Web site viewing by federal, regional and local offices of emergency management and others.  This is a Department of Health and Human Services (HHS) Agency for Healthcare Research and Quality (AHRQ) grant-funded research effort to develop a national hospital bed-tracking system in the event of a medical emergency such as a bioterrorist attack.

The Geographic Information System (GIS) is comprised of a database, Web services and a Web site.  The database is store the secure information that is queried via an eXtensible Markup Language (XML) from disparate hospital systems located around the U.S.

The Web service is a secure system-to-system transfer of bed availability information into the HAvBED database.  The Web site allows a secure information display as well as a secure log-in for bed availability data entry from other participating hospitals which do not have a computer system interface with HAvBED.  This is a proof of concept project, and all hardware specifications have been designed to meet this limited functionality.

The decision to purchase Environmental Systems Research Institute, Inc. (ESRI) software, ArcEditor, ArcIMS, and ArcSDE, was determined by the need of the project to present a graphical displayed in large geographic databases stored in Microsoft Structure Query Language (SQL) Server 2000.  The Internet GIS system would go through development environment, where application components configured to interact with Web services and spatial engines to generate maps across the Web.  The final production was transferred to the Secured Server where several issues arose.  Security features would intermittently allow the display of map images within the Web application.  The issue was resolved by discontinuing to use the ArcSDE connection and place the ESRI shapefiles directly on the Application Server.

Select to access Application Narrative/Overview.

Return to Appendix I Contents

2.2. High Level Application Architecture

  1. The user-defined query generated by the Web application passing stored procedures on Microsoft SQL Server 2000 database to the ArcIMS tasker and monitor, running on the application server, which returns a .jpg map to the Web application using a set of Microsoft Common Object Model (COM) objects that expose interfaces to the Application Server, or an ActiveX Connector.
    1. The Application Server is located in a secure environment, only allowing Secure Hyper Text Transfer Protocol (S-HTTP) traffic on port 443 from the World Wide Web (WWW).
    2. The Microsoft® SQL Server database is located in a second secure environment, and accessible only via port 1433 from the Application Server Internet Protocol (IP).

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2.3. Schematic Diagram of the Application

Select to access Schematic Diagram of GIS Architecture using ArcSDE.

The initial configuration involved the use of ESRI ArcSDE connecting to ArcIMS on the Application Server.  Once the need to open Port 137 was determined by Farrugut System Consultants, the configuration was determined to be a security threat the use of ArcSDE was discontinued.

Select to access Schematic Diagram of GIS Architecture using ESRI Shapefiles.

The final configuration involved the use of ESRI shapefiles directly on the Application Server to bypass the need to open Port 137.

Return to Appendix I Contents

2.4. Application Profile

2.4.1. DNS Requirements

Return to Appendix I Contents

2.4.2. SSL Requirements

Return to Appendix I Contents

2.4.3 Firewall Ports Requirements

Select to access Firewall TCP Server Ports.

S-HTTP port 443 allows access from Internet user (client) to Web servers.  ArcSDE port 5151 allows access from ArcIMS to ArcSDE. Port 5300 was opened so the ActiveX connector can call the appropriate data derived a user defined query.  Using ArcSDE on a Secure Server requires that Port 137 be opened.  Due to security concerns Port 137 was not open and subsequently data residing in ArcSDE was placed on the Application Server.

Return to Appendix I Contents

2.4.4. Hardware
  • For Application Server, require 1 GB RAM and 2 Processors with 40 GB hard disk space.
  • For Microsoft® SQL Server, require 1 GB RAM and 2 Processors with 40 GB hard disk space.

Return to Appendix I Contents

2.5. Contacts

2.5.1. Technical Contacts

The responsibilities of these technical contacts for the application include providing technical support.

Name

Title

Role/Responsibility

Phone

Email

Pager/Cell

Gerald Pattyn

Senior Consultant

ArcIMS

(303) 666-9133 x112

pattyn@farragut.com

(720) 840-4699

Return to Appendix I Contents

3. Operations Guide

3.1. Application Components

  1. ArcEditor 9.0:
    1. ArcEditor is the complete GIS desktop system for editing and managing geographic data. ArcEditor was used primarily to move spatial data to Microsoft SQL Server 2000.
  2. ArcIMS 9.0:
    1. ArcIMS is the solution for delivering dynamic maps and GIS data and services via the Web. It provides a highly scalable framework for GIS Web publishing that meets the needs of corporate Intranets and demands of worldwide Internet access. Using ArcIMS, city and local governments, businesses, and other organizations worldwide publish, discover, and share geospatial information.
  3. ArcSDE 9.0:
    1. ArcSDE is a server software product used to access large geographic databases stored in relational database management systems (RDBMSs). It is an integrated part of ArcGIS and a core element of any enterprise GIS solution. Its primary role is to act as the GIS gateway to spatial data stored in a RDBMS. ArcSDE provides a suite of services that enhance data management performance, extend the range of data types that can be stored in a RDBMS, enable schema portability between RDBMSs, and offer configuration flexibility.
  4. Tomcat 4.1.29 using J2SDK 1.4.2:
    1. ArcIMS components are Java components and require a JavaVirtual Machine (VM), which provides the basic application programming interface (API) for running these applications. The JavaVM is included in the Java Developer Kit (JDK). ArcIMS requires a JRE, which is installed if it is not already on the machine. It is possible to have more than one JavaVM on a machine, and ArcIMS can be made to use an existing JavaVM as long as it is compatible. Servlet engine, or small program running on the Server. ArcIMS requires a servlet engine. A servlet engine is an extension to the JavaVM and provides support for servlets through a servlet API.1

1. ArcIMS 9 Architecture and Functionality, ESRI, http://www.esri.com/library/whitepapers/pdfs/arcims9-architecture.pdf


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3.2. Backup/Restore Requirements

  • ArcSDE Configuration and Tuning Guide for Microsoft SQL Server, Backup and Recovery, ESRI, Software Documentation Library for ArcGIS 9: page 73-89.

Return to Appendix I Contents

4. System Administration Guide

4.1. Configuration Parameters

Installation Process:

Install Java Servlet —> Install ArcIMS —> Install ArcSDE.

Servlet Installation:

Using the document: Install Internet Information Server (IIS) 6.0 with Tomcat 4.1.29 using J2SDK 1.4.2 for ArcIMS 9.0 on Windows® 2003,2 the servlet was installed on both the Development Server and the Secured Server to allow ArcIMS to communicate with Web services.  The installation is very particular and if not the the installation steps are not followed precisely the results include a non-responsive Internet GIS system.

The article, Configure ArcIMS to work with HTTPS,3 is necessary for ArcIMS to work on a Secure Server.  A security certificate must be exported out of the Trusted Root Certification Authority and import certificate into the JAVA installation.


2. http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=25867
3. http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=21669


Return to Appendix I Contents

4.2. GIS Data

4.2.1. GIS Data Details

GIS Shapefiles:

  • lines_freeways
    • National coverage ESRI shapefile.
  • lines_highways
    • National coverage ESRI shapefile.
  • lines_rivers
    • National coverage ESRI shapefile.
  • lines_roads
    • National coverage ESRI shapefile.
  • points_airports
    • National coverage ESRI shapefile.
  • points_hospitals_name
    • American Hospital Association latitude and longitude data converted to feature points using ESRI's ArcGIS.
  • points_landmarks
    • National coverage ESRI shapefile.
  • points_schools
    • National coverage ESRI shapefile.
  • polygons_airports
    • National coverage ESRI shapefile.
  • polygons_cdc
    • National coverage ESRI shapefile.
  • polygons_counties
    • National coverage ESRI shapefile.
  • polygons_countries
    • National coverage ESRI shapefile.
  • polygons_lakes
    • National coverage ESRI shapefile.
  • polygons_parks
    • National coverage ESRI shapefile.
  • polygons_fema
    • National coverage ESRI shapefile.
  • polygons_msa
    • National coverage ESRI shapefile.
  • polygons_ocean
    • National coverage ESRI shapefile.
  • polygons_States
    • National coverage ESRI shapefile.

Return to Appendix I Contents

5.1. Future Recommendations

The HAvBED GIS component operation could be improved.  The initial architecture included the use of the spatial database engine ArcSDE, a GIS component that works with multiple users editing and using the GIS data without compromising the performance.  The use of ArcSDE will also allow the dispersion of GIS components away from a single machine setup which burdens the processing power of a single server.  Individual components of the ArcIMS system can be broken out and distributed among several server and thus balancing the work load and increasing the performance significantly.  The diagram below shows the outgoing and incoming server port traffic in a typical four-node ArcIMS High-Availability Configuration. All the outgoing TCP connections on an ArcIMS component are consolidated onto a single "any" port. Listening ports are illustrated with black boxes and white numbers.4

Select to access Server Port Diagram for a Four-Node ArcIMS High-Availability Configuration.


4. http://www.esri.com/systemsint/kbase/docs/arcims_tcp_port_tb_rev2.pdf


Return to Appendix I Contents
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The information on this page is archived and provided for reference purposes only.

 

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