Ruth Toni Coalson
GIS Specialist

 Toni Coalson has many years of experience with the implementation of GIS technologies which includes a variety of applications including physical and cultural spatial analysis. Coalson has assisted with the completion of numerous GIS analytical projects that compare physical and cultural constraints as a means for describing complex interactions between natural resources and population characteristics. She has also assisted with the preparation of detailed graphic materials to illustrate important project characteristics and environmental impact issues. 


  • Site location analysis for a rock quarry using various limiting data sets that include population density, geology, roadway circulation, availability of critical public services, land use compatibility, and biological constraints.
  • Biological and cultural resource mapping for various development projects.
  • Use of Trimble GPS with ArcPad extension to map environmental characteristics, and downloading and presentation of GPS data in ArcGIS/Info applications.
  • Comparison of land use constraints for aggregate resource development.
  • Mapping of exploration data to assist with economic feasibility studies for mineral resource development.
  • Mapping of utility easements and water system features using a variety of data sources.
  • Site visibility analysis using Spatial Analyst extension.


  • ArcInfo and ArcGIS software (extensions, Spatial Analyst and 3D Analyst)
  • AutoCad, Visual Basics, Excel and MS Access.

Work History

EnviroMINE, Inc., Office Manager and GIS Specialist
San Diego, California, 1997 - Present

Sweetwater Authority, GIS Intern
Chula Vista, California, Summer 2002

Licensed Vocational Nurse
21 years


GIS Certificate, Mesa College, 2002
A.S., Nursing Technology, Grossmont College, 1995
Vocational Nursing Certificate, Grossmont College, 1972