Gradient

Environmental Sciences

Geographic Information System (GIS)

Overview
Example Projects
Experts

Overview

A Geographic Information System (GIS) assimilates information about a location or series of locations into a database structure to assist in the collection, organization, analysis, and visualization of data. In a GIS, a wide variety of data types from numerous sources and time periods can be aligned, cataloged, analyzed, and viewed together. Databases help to minimize inaccuracies and errors in analytical procedures, and allow for easier communication of results.

GIS Groundwater Contaminant map

 

Example Projects

Contaminant Release and Migration Conceptual Model Development

Full Description

Gradient reviewed historical environmental investigations, aerial imagery, and other records dating back to the 1940s to assist in the development of a conceptual model of contaminant release and migration in groundwater. We incorporated a comprehensive set of groundwater quality data into a database and developed maps illustrating plume signature and evolution over time. Our analysis included aerial images dating back to the 1930’s and an evaluation of changes in land cover and use.

Groundwater Elevation and Chemical Isopleth Contour Map Development

Full Description

Gradient developed groundwater elevation and chemical isopleth contour maps from spatial interpolation methods used as part of a US EPA and USGS approved 3-D numerical groundwater contamination transport model. We designed a database to catalog and track routine groundwater gauging and sampling events; and generated graphs, tables, and maps representing the groundwater sampling data.

Field Reconaissance and Sample Plan Development

Full Description

Gradient performed a site visit to collect differential GPS data and photo-log pertinent features and locations.  We reviewed facility documents and developed a composite site plan showing historical sampling and exploration locations.  To ensure spatial representativeness, we developed a sampling plan using facility construction plans and field data in combination with industry standard sampling protocols to establish a randomly selected sampling location network.

Custom Environmental Database Management System Development

Full Description

Gradient developed a custom environmental database management system which facilitates and standardizes the collection, management and reporting of environmental data allowing for integrated data management, tracking, and reporting. 

Experts

Kurt Herman Read Bio

Matthew J. Mayo Read Bio

David E. Merrill Read Bio