Overview
Data Structure
Digitizing
Data Entry Errors
Level of Effort
Error Analysis
Metadata Report
Future Mapping

Overview

Welcome to the Team Rectifiers Final Report for Geog 5223.  The project required us to organize data for research regarding Sanborn Maps for the ACHS to study the city of Charlottesville, Virginia. Specifically, we were asked to set up a GIS to accomplish the following:

• Genealogy—Create a geocoding address of location of persons/business in historical city directories (georeferencing)
• City Visualization—Create thematic maps and 3D views
• Land Use Change studies—analyzing changes in the relative proportion and distribution of land use categories through time

This report summarizes the efforts and considerations we took to prepare the GIS. We've divided the report into the following:

• Data Structure

• Digitizing Procedures

• Data Entry Errors

• Level of Effort

• Error Analysis

• Metadata Report

• Future Mapping

This page gives an overview of each of these topics and includes a link to more details.

Data Structure

In order to collect the data as efficiently and compactly as possible, we established two feature classes and one look up table.  We put these elements into a Personal Geodatabase.  Details

Digitizing Procedures

The digitizing consisted of georeferencing the Sanborn maps and then digitizing the street and building features.  While digitizing the features, we also populated the databases with necessary information. Details

Data Entry Errors

Preventing (and correcting) data entry errors required us to pay particular attention to the three elements we created: 1) Buildings feature class, 2) Street feature class, and the data in the tables associated with the two feature classes and the look up table. Details

Level of Effort

The level of effort is noted for:

• Georeferencing Timing—approximately 35-60 minutes.

• Digitizing—1-2 hours.

• Consolidating Database—approximately 4 hours.

It is important to note that the above times are the first-time efforts of each of the team members.  Details

Error Analysis

The sources of error are in the spatial and attribute data we compiled and we took steps to mitigate them. However, even with the errors we could not eliminate, the result is sufficient for the purposes of the ACHS. Details

Metadata Report

Two metadata reports were generated for the feature classes in the project: One for Buildings and one for Streets. Details

Future Mapping

With the Team Rectifier's GIS, we are now in a position to BETTER understand the system that we must put in place to address the ACHS requirements.  That is, what we have right now would not be sufficient to satisfy the ACHS need.

Figure 1: Example Thematic Map—Charlottesville Land Use in 1920

Source:  Rectifier Team ArcMap Final Project data.

With the database, we discuss the future mapping possibilities and illustrate a number of thematic maps showing a variety of aspects of Charlottesville. Details
 

GEOG 5223: Elements of GIS: Part 2 (ESRI Track) CD. Accessed September 2004.

How to Read Sanborn Fire Insurance Maps, University of Virginia Library website. http://fisher.lib.virginia.edu/collections/maps/sanborn/web/details.html.  Accessed September 2004.

GEOG 5223: Project 7, 8, 9 & 10: Final Project, Accessed September 2004.