Zoom in. Zooms in to area represented by rectangle drawn on the map.
Zoom out. Zooms out based on the size of the rectangle drawn. A smaller rectangle results in a larger zoom.
Pan. Hold the left mouse button down and drag the map to recenter
Zoom in 2x. Click on the map to zoom in by a fixed amount. The display will be recentered on the location of the mouse click on the map display.
Zoom out 2x. Click on the map to zoom out by a fixed amount. The display will be recentered on the location of the mouse click on the map display.
Query.Returns info for features in the query layer that fall within a rectangle drawn on the map. The query layer is set under the map layers tab through a checkbox under the query column. A single mouse click will cause the query to perform a select-by-point operation with a 3-pixel radius. Query results are displayed under the query results tab below the map display.
Reset. Resets the map to a state-wide extent
Redraw. Redraws the map at the current extent (e.g. after turning layers on/off)
Find. Displays a dialog to search for, and zoom to, geographical features. The dialog appears in the lower frame below the map display. The feature search/zoom uses the USGS geographic names database, containing over 25,000 named features from USGS maps. Features include towns, streams, airports, mountains, churches and many others.
The section below the map contains several tabs that organize information associated with the map.
map layers This tab contains the list of available map layers, a checkbox for turning the layers on/off, a checkbox for selecting the layer to query, and a legend symbol.
overview map Shows a state-wide map and a rectangle indicating the current extent of the main map.
locate place Search for places in the geographic names database and zoom to them on the map, or zoom to a longitude/latitude coordinate.
query results Tab that shows the results of map queries.
help Guide to tabs, map controls, and layers.
about Detail on application environment.

The map layers tab below the map contains infotmation and controls for the various layers. The left checkbox beside each layer turns the layer on/off. Use the redraw button to refresh the map display after turning layers on or off. The right checkbox selects which layer will be queryed. Only one layer can be selected as the query layer.

The aerial photography and topographic map layers are larger datasets and may require longer to draw. It may be better to zoom to a desired area, using the other layers as a guide, before turning these layers on.

Some layers contain too much detail and will not draw until zoomed in. Viewable layers will be labeled using a dark color in the legend, while layers labeled with a lighter color will not be drawn.. Road, stream, and town layers use increasingly detailed datasets depending on the scale.

County boundaries. Digitized from 7.5' USGS DRGs. Demographic info from Census Bureau, via ERSI Data & Maps CDROM 2003.
2007 Aerial Photography. 1-meter color infrared aerial photography flown in 2007. Constructed from tiles clipped from the original source data. Layer will ony display at scales larger than 1:40,000 due to database size and server speed limitations. Querying the doqq layer will display the source quarter-quadrangle.
USGS Topographic Map. USGS 1:24,000 topographic maps, consisting of 2,742 5000x5000 meter tiles covering the entire state. Layer will ony display at scales larger than 1:50,000 due to server speed limitations.
Watersheds. 11-digit watersheds from the Natural Resource Conservation Service. Query will produce statistics for selected landcover types (based on MRLC landcover data from USEPA) and wetlands (based on NWI wetlands data). Though widely used, This dataset has been superseded and may be replaced.
Streams. At scales of 1/50,000 and larger-- 1/24,000 scale National Hydrology Dataset, including polygon waterbodies and wide streams, and wetlands. From 1/50,000-1/100,000-- 1/100,000 scale EPA Reach. At 1/100,000 and smaller-- subset of 1/100,000 scale EPA Reach. Querys always reference 1:24,000 scale layer, so stream names may be returned even though they are not displayed.
Roads. Displays primary highways at small scales, 1/100,000 scale roads (from TIGER Dataset) at scales greater than 1/75,000.
Towns/Populated Places. Displays major towns at scales smaller than 1/100,000 or populated place names from the USGS GNIS database at scales greater than 1/100,000.
Open Dump, Not Completed . Displays locations of future cleanup projects that have not been completed. Projects are symbolized based on the program associated with each project.
Open Dump, Completed . Displays locations of completed projects funded by the WVDEP's Pollution Prevention and Open Dump (PPOD) program. Selected projects have photos. Projects completed prior to January 1, 2004 may not appear on the map. Projects are symbolized based on the program associated with each project.