View Clickable ArcGIS Data On Top of Google Maps

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Gmap4 can display all ArcGIS MapServer and ImageServer data

This simple syntax
can be used to display any ArcGIS MapServer layers or basemaps. Any necessary reprojection is handled by ArcGIS Server on-the-fly.

For ImageServer data the syntax is even easier:

Example GIS map: USA stream gage map

The two following Google maps both display an ArcGIS layer from a server operated by the USA Department of Interior. Each symbol on the map shows the location of a stream gage. If you click on a symbol then you will see a popup with all the most recent GIS attribute data stored on the server for the thing that you clicked. Note that the attributes for each stream gage include a link that will display a very nice graph plus lots of additional information.

In this first example map the GIS stream gage layer is specified in the Gmap4 link. This approach is best suited if you have just a few GIS layers to display.,-90.311523&z=7&t=m,Stream_flow&rest=

In this second example map the ArcGIS stream gage layer is specified in a text file. This approach is best suited if you have more than just a few GIS layers to display. Both methods use the same syntax for specifying GIS data and the resulting maps are identical. You can specify a combined maximum of 25 GIS basemaps and overlays.,-90.311523&z=7&t=m,Stream_flow&q=

The text file for the above map is hosted for free at Google Sites. If you do not have your own website, then this is a great way to put your data files online. For step-by-step instructions for using Google Sites, please go to the Gmap4 help page and download the pdf file 'Working With Files' and search that file on 'google sites'.

Tip: If you click on a GIS symbol and do not see a popup with attribute data for the thing that you clicked, then try zooming and then clicking that symbol.

Example GIS map: 20+ weather related ArcGIS MapServer layers

When the following map opens, the weather radar for the USA is shown. To access the Overlay menu, click the basemap button. Mobile users will need to scroll down to see the list of basemaps. The "Weather_watch_warning" layer is often interesting since you can click on a colored area and see the GIS attributes which include a link to the statement issued by the weather service. For more tips on using the map, click "About this map" in the upper left corner.,-97.602539&z=5&t=m,USA_weather_radar&q=

Example GIS map: 1 foot resolution aerials from ArcGIS ImageServer data

The U.S. Geological Survey collected high resolution aerial imagery from a variety of sources and is hosting those aerials as ImageServer data. One nice thing about this data is that a lot of these aerials were taken when there were not leaves on the trees and therefore you can see features on the ground such as small 2-track roads and ATV trails. Those features are typically not visible on the Google aerials which are usually taken when the leaves are on the trees.,-97.870117&z=5&t=1_foot_aerial&rest=

Google maps with hundreds of ArcGIS layers for recreation, weather and wildfires

Gmap4 can display a nearly endless amount of GIS data with the familiar Google maps interface and all the standard Gmap4 features such as a touch-friendly interface on mobile devices and geolocation. The following link is the homepage for a project that features Gmap4 links that can display hundreds of mostly recreation and weather related GIS overlay layers and basemaps. Some maps cover the entire USA while others focus on specific states. There are maps showing GIS data for weather, wildfires, national forests, national parks, NOAA's water navigation charts and more. More map links will be added to this project as time allows.

Map links:

Example maps with GIS layers and attributes related to emergency response

These maps show things like police and fire stations, hydrants, hospitals, storm surge areas, evacuation routes and more. In addition, each map also displays the U.S. National Grid (USNG). This coordinate system is the federal standard for search-and-rescue operations on the ground.

Map links:

Here is a pdf file with a short description of the Gmap4 features that support USNG coordinates:

Learn how to make Gmap4 links to display GIS data layers and attributes

Gmap4 can display any GIS data that is available via either the ArcGIS MapServer interface or WMS interface. Step-by-step instructions can be found at:

If you are a GIS beginner then you might prefer to start with the "GIS More Help" page.