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MassDEP Online Map Viewer
Wetland and Wetland Change Areas Map

Wetland and Wetland Change Areas Map Layers

See links below for detailed documentation on the data layers displayed on this map.

Wetland and Wetland Change Areas Map

The Wetland and Wetland Change Areas Map displays MassDEP photo-interpretted wetlands and areas of detected wetland change.

Wetlands and areas of wetland change represented on this map have been determined primarily through photo-interpretation. They do not represent, and should not be used as, wetlands delineation under the Wetlands Protection Act (M.G.L. c. 131, sec. 40) and the implementing regulations (310 CMR 10.00 et seq.).

Operational layers and orthophoto imagery shown on this map are provided by the Massachusetts Office of Geographic Information (MassGIS) Geospatial Web Services. Operational layers and untiled orthophoto imagery may be scale sensitive and will draw only when the map is zoomed in to an appropriate scale. Aerial base map imagery provided by Google Maps JavaScript API v3, Bing Maps JavaScript API and MassGIS will display at all scales.

Using the Online Map Viewer

The Map Tools allow the user to navigate and interact with the map. A map tool can be initiated by clicking on the icon in the map tool panel. A solid red outline surrounding the tool icon indicates that the tool is active. A series of buttons below the tool bar provide additional information about the map.

Map Tools

Select the Zoom in tool to zoom the map in to a larger scale. You may either click on a single spot on the map to zoom in one zoom level or zoom to a general area by clicking and dragging the cursor to create a selection box around your area of interest. Since the map uses preset zoom levels the resulting extent will be the closest preset zoom level to your chosen area. The Zoom in tool automatically recenters the map display on the selected point or the center of the selection box.

Click the Zoom out tool to zoom the map out one zoom level.

Select the Pan map tool, then click and drag the map (pan) in any direction.

Click the Zoom to full extent tool to zoom the map out to the maximum extent. This will return the map display to the default extent of the State of Massachusetts.

Click the Go to previous extent tool to return the map back to a previously viewed extents.

Click the Go to next extent tool to zoom the map forward to previously viewed extents.

The Zoom to address tool opens a dialog box on the map. Enter a complete street address (example: 1 Winter St Boston, MA 02108) into the dialog box (please include municipality and zipcode), then click Submit. A pop-up window will appear with the address search results and a score indicating locational quality. The higher the value the higher the confidence in locational accuracy. Click a Zoom button next to the address to zoom the map to that address result.
An address marker will appear on the map indicating the estimated location of the address. To remove the marker from the map, click the Clear button in the lower right corner of the Zoom to Address window.

The Zoom to town tool opens a combo box containing a list of the 351 Massachusetts municipalities. when a municipality is selected from the list the map will zoom to the approximate center of the municipality.

The Map Transparency tool opens a pop-up window with a slider control. Select the tab for the layer you want to adjust and move the slider control to change the opacity (transparency) level of that layer.

Select the XY Information tool, then click on the map. A pop-up window will appear with coordinate information for that location and an orange cross will be displayed at the point where the map was clicked. Use the Clear button in the lower right corner of the XY Information pop-up to clear XY markers from the map.

The Table of Contents tool opens up the map's table of contents, which shows all the layers and base maps that can be displayed in the viewer. Turn Operational Layers and Base Maps on and off by checking or unchecking the corresponding check boxes and radio buttons. Closing the Map Layers window with the Operational Layers turned off will automatically turn the layer(s) back on.

The Measure tool can be used to measure distance and area on the map. Select Length to measure length or Area to measure area on the map.

Overview Map

Click on the Overview Map button (located in the lower right hand corner of the map) to minimize or maximize the overview map.

If you require further assistance using this viewer, please contact...

Aaron Richer
MassDEP - GIS Program
1 Winter Street
Boston, MA 02108
(617) 574-6856

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