The Pennsylvania Atlas is a data viewer and download utility developed to provide a map based interface to statewide data layers housed at PASDA. The Atlas allows users to select, view, and clip and reproject data prior to downloading.
In order to view any of the base layers in the Atlas the user must click on the square box allowing that layer to be visible. Note: You can make as many layers visible as you need at one time. To Show Information for Active Layer the user must click on the circle under the Active heading. Note: Only one layer can be active at one time.
The Pennsylvania Atlas contains many tools to assist viewing and downloading. A description of the tools follows.
Some layers contained in the Atlas are too large to display at full extent. These layers will become visible as you begin to zoom in on the map using the Zoom In button. Additionally, some layers will disappear such as the green Terrabyte Image that is the main default view of the Atlas. As you zoom in this will be replaced with an aerial photograph of your focus area. NOTE: A seamless aerial photograph of the entire state is available as a layer when the Terrabyte Image is not displayed.
As you can see from the picture above we have the Roads Layer (the red lines) and the Aerial Photo UTM Zone 17 & 18 turned on in our Atlas view.
In order to download data from the Pennsylvania Atlas, Click on the Clip and Reproject button 
. At the bottom of the page, a drop list will appear. Select the layers you would like to download by clicking in the box next to the data set. Next, set the projection for your data by selecting a single projection from the drop down list and click Submit. The layers will be clipped to the extent of your present view in the Atlas and zipped into a single file for you to download.
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