Orthoimagery Discovery Application Help - Introduction and Map Navigation
The Orthoimagery Data Discovery and Download application allows the user to search, discover, filter and download MEGIS image data. Data can be downloaded in a number of different formats.
NOTE: This application is NOT intended for visualization of data, it is intended for data discovery and downloading. As such, imagery will not be displayed on the screen when zoomed beyond its native resolution.
This documentation includes several pages grouped by topics:
Basic navigation functionality is provided to allow the user to move around the map. The application will open with a statewide map view. This includes zoom in/out controls, and previous extent/next extent/full extent on the upper left corner of the map:
The map can be panned by clicking with a mouse and dragging to a new location. If equipped with a mouse wheel, the map can be zoomed in and out by rotating the wheel.
Find and Zoom to a Location
A named location can be navigated to by using the Enter a Location tool. On the middle of the toolbar:
Enter a Location where indicated. The map will zoom to that location. This can be a street address, town name, or similar named location:
The basemap displayed in the background can be changed by clicking the Basemaps button, then selecting the desired basemap:
A Bookmark tool is provided on the toolbar. Users can select existing bookmarks, and create their own, to allow zooming to those locations. To zoom the map to a previously bookmarked location, click the Bookmarks button on the toolbar, then click on a bookmark to zoom to it:
To add a new bookmark, first make sure the map is zoomed to the location of interest. Open the Bookmarks tab if necessary, and click the + button on the upper left of the Bookmarks tab. Type the name of your bookmark in the Label field and click Create. To remove a bookmark, click the ? button on the right end of that bookmark.
Some of the basemaps do not have labels. Use the Labels button to toggle place name label display:
Map layers can be turned on and off using the Layers dialog. Click the Layers button on the toolbar to open the dialog box. Make sure the Layers tab is selected. Layers can be turned on and off by checking or unchecking:
It is also possible to add a reference layer to the map, if it is available as a service. Click the Add Layer tab on the Map Layers tool, enter the URL to the reference layer, enter a label of your choice, and select the type of layer (Image, Map, Feature or KML) from the Type list:
Added layers can also be removed by clicking the Saved Layers tab. Click the - sign to the left of a layer to remove it, or click the Clear Entries link to remove all added layers.