Your choice of orthophotos can be displayed in one of three modes by picking the buttons at the top of the PICT window. The selected view mode button is blue.
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Independent Views is the default viewing mode. There are two side-by-side views you pan and zoom independently. Each independent side-by-side view allows an overlay image where the overlaid image can be adjusted to be partially transparent allowing you to "see through" the overlaid image to the base image. This let's you analyze two images in one window. Sliding the Transparency control back and forth helps you see the differences in the two orthophotos. The Independent Views mode is the only mode that allows you to select overlay images. Selecting an overlay image enables the transparency control. |
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Tracked Views are side-by-side with linked panning and zooming. That is, panning and zooming one image, moves the other image in lock step. The images track each other and always show the same area on the ground. You see the same area twice, typically with different images. Overlay images and transparency controls are disabled in the Tracked Views mode. |
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Spliced Views shows side-by-side with the two views spliced along a vertical seam line. The image on the left is west of the seam line and the image on the right is east of the seam line. Panning and zooming moves the images under the stationary seam line. You see one area on the ground, split in the middle and typically displayed with different images on each side. Panning back and forth is a good way to see and understand orthophoto differences under the area of the seam line. This is called "swiping" the images. Overlay images and transparency controls are disabled in the Spliced Views mode. If the browser window is small and the window has a horizontal scroll bar, then the Spliced Views mode view may have a gap at the vertical seam line. Use a bigger browser window and refresh the map page. |
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Selects the base image to be displayed in the view. |
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Selects an overlay image to be displayed over the base image.
Overlay images may only be selected in the Independent Views mode. Overlay image selection is not available and shows "None" grayed out when in the Tracked Views or Spliced Views modes. |
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Pan | Pans around the image by click-dragging on the image. |
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Zoom | Zooms in or out of the image by click-dragging the magnifier on the image. |
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Zoom Box | Zooms into the image by click-dragging a zoom box over the image. |
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Unzoom | Zooms out to the full extents of the image. |
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Latitude/Longitude | Shows latitude/longitude by picking a location on the map. The point's latitude and longitude are displayed in both decimal degrees and degrees/minutes/seconds formats. |
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MapGuide | Zooms to the current image pane view extents on MapGuide. The area and width on MapGuide will be the same as that shown on one PICT image pane. Pan and zoom PICT to the area you want to see on MapGuide before picking the PICT MapGuide tool. In Independent Views or Spliced Views modes the area shown on MapGuide is the extent of the image pane below the MG button, not the extents of both image panes. |
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Oblique Aerial Photo | Shows an oblique aerial photo from Bing Maps by picking a location on the map. The displayed photo will be centered on the point you pick, but Bing Maps sets the photo's initial width and area. You can pick various locations on the displayed PICT image to show the corresponding oblique aerial photo. |
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Draw Rectangle | Draws a rectangle on the view. |
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Draw Circle | Draws a circle on the view. |
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Draw Polygon | Draws a polygon on the view. |
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Delete Drawing | Deletes the drawing object. |
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Each image has a Progress Bar that shows progress
loading the current image view.
As the image loads, more detail is displayed.
When the progress bar is all blue, image loading is complete and the image shows the maximum available detail for the image view. On fast networks, images may load so quickly that you won't see the progress bar progression to all blue. |
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The Transparency Control changes the transparency of the
current Overlay Image, letting you "see through" the overlay image
to the the base image underneath to see the differences in the images.
The Transparency Control defaults to 0% transparency, meaning the overlay image completly blocks the base image view. Moving the control to the left makes the overlay image more transparent so you can see the base image through the overlay image. When the control is all the way to the left at 100% tranparency, the overlay image has no effect and it's just like viewing the base image without an overlay image. The Transparency Control is not available and shows "Transparency" grayed out when no overlay image has been selected. Along with overlay images, the transparency control only works in the Independent Views mode. |