Following is a list of freeware that provides tools for mapping environmental data. Before you access any software or apps, please read our disclaimer and permissions page if you haven't already done so.

ASPEN
By US Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS). The Assessment System for Population Exposure Nationwide (ASPEN) consists of a dispersion and a mapping module. The dispersion module is a Gaussian formulation based on ISCST3 for estimating ambient annual average concentrations at a set of fixed receptors within the vicinity of the emission source. The mapping module produces a concentration at each census tract. Input data needed are emissions data, meteorological data and census tract data.

Better Assessment Science Integrating Point and Nonpoint Sources (BASINS)
By US Environmental Protection Agency, Office of Science and Technology. Integrates a geographic information system (GIS), national watershed data, and environmental assessment and modeling tools into one package. For use by regional, state, and local agencies in performing watershed and water-quality based studies. Assesses large amounts of point source and nonpoint source data.

Ecosystem Management Decision Support (EMDS)
By US Department of Agriculture, Forest Service. The Ecosystem Management Decision Support (EMDS) system is an application framework for knowledge-based decision support of ecological assessments at any geographic scale. The system integrates a geographic information system (GIS) that provides decision support for a substantial portion of the adaptive management process of ecosystem management.

EnVision
By US Department of Agriculture, Forest Service. A rendering system for stand- and landscape-scale images. Basic components of an EnVision project include a digital terrain model to define the ground surface, color and texture maps to define ground surface characteristics, and groups of objects or "actors". Scene definitions include background imagery used to add clouds and distant landscape features, model components (e.g. terrain model(s) and polygon overlays), viewpoint and camera characteristics, and foreground imagery used to provide high detail in the image foreground.

Epi Info
By US Center for Disease Control (CDC). With Epi Info and a personal computer, epidemiologists and other public health and medical professionals can rapidly develop a questionnaire or form, customize the data entry process, and enter and analyze data. Epidemiologic statistics, tables, graphs, and maps are produced with simple commands such as READ, FREQ, LIST, TABLES, GRAPH, and MAP. Epi Map displays geographic maps with data from Epi Info.

GEOEAS (for DOS)
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. GEOEAS is a collection of interactive software tools for performing two-dimensional geostatistical analyses of spatially distributed data. The principal functions of the package are the production of grids and contour maps of interpolated (kriged) estimates from sample data. GEOEAS can produce data maps, univariate statistics, scatter plots/linear regression, and variogram computation and model fitting.

Geographic Resources Analysis Support System (GRASS) GIS
By Grass Development Team. This Geographic Information System (GIS) is used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization.

GeoWEPP
By University at Buffalo, Purdue University, and ARS. The Water Erosion Prediction Project (WEPP) model is a continuous simulation, process-based model that allows simulation of small watersheds and hillslope profiles within those watersheds for assessing various soil and water conservation management options for agricultural, rangeland, and forest sites. The Geo-spatial interface for WEPP (GeoWEPP) utilizes digital geo-referenced information such as digital elevation models (DEM) and topographical maps to derive and prepare valid model input parameters and defaults to start site-specific soil and water conservation planning for a small watershed with a single soil and land use for each sub-catchment.

Google Earth App
By Google. Fly around the planet with a swipe of your finger with Google Earth for Android. Explore distant lands or reacquaint yourself with your childhood home. Search by voice for cities, places, and businesses. Browse layers including roads, borders, places, photos and more. Visit the Earth Gallery to find exciting maps such as real-time earthquakes, planes in flight, hiking trails, city tours, and more.

HEC-GeoHMS
By US Army Corps of Engineers. The Geospatial Hydrologic Modeling Extension (HEC-GeoHMS) is a software package for use with the ArcView Geographic Information System. GeoHMS uses ArcView and Spatial Analyst to develop a number of hydrologic modelng inputs. Analyzing digital terrain information, HEC-GeoHMS transforms the drainage paths and watershed boundaries into a hydrologic data structure that represents the watershed response to precipitation. In addition to the hydrologic data structure, capabilities include the development of: grid-based data for linear quasi-distributed runoff transformation (ModClark), the HEC-HMS basin model, physical watershed and stream characteristics, and background map file.

HEC-GeoRAS for ArcGIS 9
By US Army Corps of Engineers. HEC-GeoRAS for ArcGIS 9 is a package of ArcGIS 9 macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.

HEC-GeoRAS for ArcInfo (Unix)
By US Army Corps of Engineers. HEC-GeoRAS for ArcInfo is a package of ArcInfo macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.

HEC-GeoRAS for ArcInfo (Windows)
By US Army Corps of Engineers. HEC-GeoRAS for ArcInfo is a package of ArcInfo macros specifically designed to view and manipulate geospatial data for use in the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The graphical user interface allows users with minimal GIS experience to create a HEC-RAS import file containing geometric attribute data from an existing digital terrain model (DTM). Water surface profile data exported from HEC-RAS simulations may also be viewed using HEC-GeoRAS. The HEC-GeoRAS macros are written in the arc macro language (AML) and require the ArcInfo program with the TIN extension.

HEC-GeoRAS for ArcView
By US Army Corps of Engineers. The Hydrologic Engineering Centers River Analysis System (HEC-RAS) allows you to perform one-dimensional steady and unsteady flow calculations. HEC-GeoRAS is an ArcView GIS extension that provides the user with a set of procedures, tools, and utilities for the preparation of GIS data for import into HEC-RAS and generation of GIS data from RAS output.

Internet Geographical Exposure Modeling System (IGEMS)
By US Environmental Protection Agency, Office of Pollution Prevention and Toxics (OPPT). IGEMS is a modernization of OPPT's older Graphical Exposure Modeling System and PCGEMS tools. IGEMS brings together in one system several EPA environmental fate and transport models and some of the environmental data needed to run them. IGEMS includes models and data for ambient air, surface water, soil, and ground water, and makes the models much easier to use than their stand-alone counterparts. IGEMS will have graphics and Geographical Information System (GIS) capabilities for displaying environmental modeling results.

LIB (for Data General AViiON)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications. Include AIDE (ANNIE Interactive Development Environment), GRAPH (interface to Graphical Kernel System (GKS)), UTIL (for manipulating character strings, numbers, and dates), and WDM (Watershed Data Management file system). UNIX source code is available.

LIBANNE (for DOS)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications, including a data base (WDM), graphics, and interactive user interface (AIDE).

LIBANNE (for Solaris)
By US Geological Survey (USGS). A collection of related libraries for use in hydrologic applications, including a data base (WDM), graphics, and interactive user interface (AIDE).

LIBUTL (for Data General AViiON)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.

LIBUTL (for DOS)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.

LIBUTL (for Sun SPARCstation Solaris)
By US Geological Survey (USGS). Utility libraries for interactive prompting, device-independent graphics, and time-dependent data base access. These libraries were developed for use with various surface-water application programs. Source code is available.

Linear Interpolation Calculator
By GroundwaterSoftware.com. A free, online tool to perform linear interpolation calculations. Linear interpolation determines, from two points (x1,y1) and (x2,y2), what the value of y is at a different point x3.

MyEnvironment
By US Environmental Protection Agency. Provides a wide range of federal, state, and local information about environmental conditions and features in an area of your choice.

Oregon GIS, Databases and Mapping Applications
By Oregon Occupational Safety and Health Administration. Access various databases of environmental site information and certifications for Oregon.

TopoZone
By Maps a la Carte, Inc.. Interactive topo map of the United States. Includes USGS 1:100,000, 1:63,360, 1:25,000, and 1:24,000 scale topographic maps.

Vis5D
By Visualization Project at University of Wisconsin-Madison Space and Engineering Center (SSEC). Vis5D is a system for interactive visualization of large 5-D gridded data sets such as those produced by numerical weather models. One can make isosurfaces, contour line slices, colored slices, volume renderings, etc of data in a 3-D grid, then rotate and animate the images in real time. There's also a feature for wind trajectory tracing, a way to make text annotations for publications, support for interactive data analysis, etc.

WebGIS
By Lakes Environmental Software. Download digital terrain (US and worldwide), land use (US), and digital line (US) maps.

WhAEM2000 for Windows
By US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Subsurface Modeling Support. WhAEM2000 is a public domain, ground-water flow model designed to facilitate capture zone delineation and protection area mapping in support of the State's Wellhead Protection Programs (WHPP) and Source Water Assessment Planning (SWAP) for public water supplies in the United States.

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This page last updated on 9/29/16