• Increase font size
  • Decrease font size
  • Print
  • RSS
  • Optimizing Orthophotos, Imagery and Map Details

    You may have trouble getting imagery, such as orthophotos, or map details to appear sharp on printed output, particularly when making large format prints. MapGuide optimizes the delivery of imagery for screen display, not printing.

    MapGuide looks at the current displayed map scale as well as the pixel size of your screen window and re-samples the original image data so it is optimized for your display. This is how MapGuide enables fast display of imagery from source files that are many gigabytes in size. While not usually a problem, you may have similar problems making large prints of vector data (points, lines) if your screen size is small. There are a few things you can do to get the best possible resolution and detail when printing MapGuide maps:

    • Make the map window as large as possible on your screen:
      • Maximize your web browser's window to fill your screen.
      • If you have more than one monitor, consider dragging the map window out to fill both (or all) screens.
      • Reduce the size of the MapGuide legend.
      • If you are using Internet Explorer, choose View, Full Screen (F11) to reduce control space as much as possible.  (The F11 trick doesn't work when your browser's window is expanded to more than one screen.)
    • Use the Windows Display Control Panel settings to the largest screen area your hardware supports such as 1600 x 1200 pixels or more if you can do it. If you don't want to use these settings all the time, set them temporarily to do your printing.
    • Zoom to the desired scale, then right-click on the imagery layer name in the MapGuide legend and select "Rebuild". This causes MapGuide to re-sample the imagery to be sure it is optimized for your current view. (MapGuide doesn't refresh the imagery for small changes in scale. Rebuilding the imagery layer may help because if the zoom amount is small, MapGuide may not re-sample the image on the server to give you the absolute best image. Doing a manual rebuild of the image forces a refresh and ensures the best possibly quality for the current scale.)
    • Get a bigger monitor that supports higher resolutions. Now you have a good reason! (You wouldn't normally think that a bigger monitor could help printing, but if it enables you to use higher resolution settings, it helps in this case.)
    • You may want to print a larger map image. Follow the tips under Printing the Displayed Map to make the printed map fill more of the page. On the other hand, a smaller map makes the map appear sharper.
    • Tall and narrow maps such as a linear area that runs north to south can be even more challenging. See Optimizing Tall and Narrow Maps for more.

    Here's a sample image captured from the screen of a tall and narrow parcel area. We used all of the above techniques to get the largest possible image with the most detail. The captured image size is 1186 x 1486 pixels or over 1.7 megapixels. It was captured using a 20 inch, 1600 x 1200 resolution monitor where the displayed image was rotated 90 degrees to be in a "portrait" mode more suitable to the tall and narrow parcel. (If you don't have to scroll the image to see it all, your web browser may be set to resize images to fit the current window.)

    Remember that screen or printed detail is always limited by the resolution of the underlying imagery and will not appear sharp if you zoom in too close.

    Follow UsShare this page

    Geographic Information Systems

    33 N. Stone Ave., 15th Fl.
    Mail-Stop Code DTBAB17-425
    Tucson, AZ 85701

    Phone: (520) 724-6670
    Fax: (520) 791-6588


    Department Home Page
    Department News
    Department Directory
    Department Feedback Form
    Maps