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Read this page if you have trouble navigating or understanding the map interface.

Note: To view the map, your browser must have Adobe Flash Player and must allow cookies. The map will run on the Macintosh operating system, but users of Apple iOS devices (iPhone, iPod Touch, iPad) will need to obtain a Flash-enabled, third-party browser such as Skyfire or Puffin. Note that DOGAMI does not endorse any particular third-party software.

   Find an Address
Basemap Options
Pan and Zoom Controls
Scale and Scale Bar
Location Map
"Why doesn't the map appear in my browser?"
"How do I zoom to a particular scale?"
"How do I save or print a map image?"
"Why doesn't the screen update when I click layers on and off?"

GTILO interface


Tools Tab

GTILO Tools and Layers tabs

Use the TOOLS to navigate the map, see information about specific points in the map, find an address, or print the currently displayed map. Currently displayed tool windows are shown in the tool bar with an underbar.

Identify (default) - The "Identify" tool is shown when you access the map, so you can immediately start identifying geothermal features by just selecting the "Identify by Point" or other graphical tool and clicking on the data point you are interested in.

Info Query tool icon

GTILO Geothermal layers options


Geothermal Wells (blue triangles): An inventory of geothermal exploration wells with temperature gradient information.
Geothermal Springs: An inventory of thermal springs with tabulation of their water chemistry where available.
green square - temperature not available
yellow square - temperature 65.3 degrees F to 68 degrees F
orange square - temperature 69 degrees F to 95 degrees F
red square - temperature 95 degrees F to 210 degrees F
Direct Use Areas (pink regions): Those areas that have conditions favorable for the discovery of thermal water of sufficient temperature for energy saving non-electrical purposes. The color in the legend is more saturated than the color in the map because the map layer is semi-transparent. Note that Direct use area polygons are NOT part of the published GTILO-2 data set available for download.

For more information, read the Background, Download Data, and Disclaimer pages

entire Tools tab icon set


IDENTIFY TOOL - Use this tool to learn more about geothermal features. You can limit which kind of data to identify by choosing a layer from the drop-down menu. The "Identify by Point" option is selected by default, but you can also use the rectangle or polygon option to define an area in which you want to identify features.

GTILO-2 Identify tool

GTILO-2 Select dat

After you select a point or area, all geothermal features in the area are highlighted in yellow on the map and information for the features appears in the Results area of the Identify window. If necessary, use the cursor to drag down the lower right corner of the Results window to see all the results..

GTILO-2 results

To remove a feature from the Results window, click on the red X to the right of the feature name. To clear all the results from the window, click on the "Clear" link. Click on the horizontal bar at the top right of the Identify window to collapse the window. Click on the X at the top right to close the pop up window

You can click on the PDF and spreadsheet icons to access specific reports for results. If you hover over a result in the Identify window, a pop up window appears on the map itself to show where that feature is located and to provide basic information and links to reports about the feature.

GTILO-2 results

Identify by Point: With the Identify tool Point option selected, click on a geothermal feature to see information for all features at the point. The selected feature(s) will be highlighted in yellow. A pop up window will appear showing information. You can also see the information by toggling on the "Results" button at the top of the Identify window. Click on the Clear text to clear the information, or continue adding information to the Results by clicking on more features.

Identify by Rectangle: Select the Identify by Rectangle option in the Identify window. Press the cursor down a point on the map, then while still holding the cursor down, move the cursor to draw the rectangle. The defined area is shown by a blue box as you draw a rectangle or polygon. Release the cursor to stop drawing the box. The results will appear in the Identify "Results" window, and the features in the rectangle will be highlighted in yellow on the map. Click the "Identify by Point" option to deselect the Rectangle option.

.GTILO-2 Identified area

Identify by Polygon: Select the Identify by Polygon option in the Identify window. Click a point on the map, then move the cursor and click once at each point on the polygon. Double-click to stop drawing and to close the rectangle. The results will appear in the Identify "Results" window, and the features in the polygon will be outlined in blue on the map. Click the "Identify by Point" option to deselect the Polygon option.

GTILO-2 Identifdy tool polygon select

GTILO-2 Find an Address icon

FIND AN ADDRESS TOOL - Use this tool to zoom to a location by entering a COMPLETE address, including city and ZIP code, if you know it. You can find an address by street address (the mailbox icon) or by geographic coordinates (select the push-pin icon; the current coordinates are shown by default in the longitude and latitude fields). A red asterisk indicates a required field.

example Location Map with red box highlighting the current map extent

After you click the Locate button, the map zooms to the area and displays the confidence level. Note that the pop up window has toggled to the "Results" icon. The Address Matching Score indicates the "confidence" that the address found is the one entered. You can click on the "Zoom to" button to zoom in to 1:9,028 scale.

GTILO-2 address result

If the results show more than one possibility, the map recenters to the first possible address; if you click on another address, the map will recenter on that address.

For geographic coordinates, select the Coordinates icon, then enter longitude and latitude. Click the Locate button to center the map on those coordinates.

GTILO-2 Address tool

GTILO-2 Address coordinates

GTILO-2 Print tool icon

PRINT TOOL - Click on this tool to create a cartographically correct map. Click on this tool to print the current map extent or to create a PDF (portable document format) image of the current map extent. The print options available depend on the printer drivers installed on your system. You can add your own title and subtitle to your map. Be aware that the maps are for general information only and should not be used for planning purposes.

GTILO-2 Print tool


Basemap Options

GTILO-2 basemap options


Click on a basemap to use that map service as the base for the geothermal data.. More information on basemap services can be found at:



Pan and Zoom Controls

GTILO-2 scale tool

PAN AND ZOOM CONTROLS allow you to navigate around the map.

Besides panning north, south, east, and west you can pan NE, NW, SE, SW by clicking between the N, S, E, and W arrows.

Click the horizontal bars on the zoom tool to zoom to a preset scale, or clock the plus or minus symbols to move up or down the preset scales.


Scale and Scale Bar

scale bar

The SCALE BAR provides an approximate scale in miles and kilometers for the map. The latitude and longitude, in degrees, of the current cursor location or the location where the cursor last left the map frame, are also shown. To display the map at another scale, use the Scale Tool.


Location Map

example Location Map with red box highlighting the current map extent

LOCATION MAP - A red box on the small map in the lower right corner shows the extent of the large map area. You can click-and-drag in the location map area to change the focus of the large map. To hide the location map, click on the arrow at the upper left of the location map; to open the location map, click on the arrow at the lower right of the location map.


FAQs - Frequently Asked Questions

"Why doesn't the map appear in my browser?"
If the map doesn't display, make sure your browser is JavaScript enabled and allows cookies from third-party sites. The map interface has not been tested on all browsers but should work on the most popular browsers.

"How do I zoom to a particular scale?"
You cannot zoom to a particular scale. Use the scale tool to zoom to predetermined scales.

"How do I save or print a map image?"
Use the "Save As PDF" tool to view the currently displayed map image in a new browser window. Use that browser window's File > Print command to print or save the PDF file.

"Why doesn't the screen update when I click layers on and off?"
The map contains a lot of data. Sometimes the display needs time to "catch up" to the clicks. If the map will not refresh properly, try resetting the map (click the Reset button in the Tools area), or refreshing the page, or closing the browser window and then opening the map page again.