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Geodata Overlay Viewer (GOVu): An innovative way to handle high-resolution imagery


Some of the unique functionalities:

Merge:
This functionality is used to merge or overlap two images which have overlapping geo-coordinates or if they are images of same geo-positioned area.


When the user clicks on the ‚Merge™ button on the vertical toolbar, the list of images currently open appears in the list box, except for the top image which is the image to which another image is to be merged.

The images are merged in the swipe mode by default. In the swipe mode the two images are present one above the other and are separated by a red line.

The red line acts as a curtain for the second image over the first image, and as the red line is moved by the user the images are hidden and shown.


The user can hide the second image by right clicking and choosing ‚Swipe™ from Pop up menu, which will now become unchecked.

The user can also blend the two images by choosing the‚ Blend™ option

In the blend mode, the two images blend with each other.

The user can change the blend ratio of the two images using the Blend Slider Bar available on the status bar. As the user moves the pointer to the left on the Blend bar, the ratio of first image in the blend increases and vice versa.



Export:
Export is the Second Button on the Top most Toolbar of the RMSI image viewer. The Export function allows the user to create tiff, bmp and jpeg (only jpg in case of original created using ECW compression) images out of the .gov image. The user can create images of different sizes and resolutions using this function. When the user clicks on ‚Export™ button on the toolbar, a tabbed window appears on the screen.


Export Area Tab: The first tab window in the dialog box helps define the area of the image to be exported plus the resolution at which the image is to be exported.
  • The Left, Right, Top, Bottom options allow the user to specify the extents of image to be exported.
  • The Width and Height are used to specify the width and height of the image to be exported.
  • The CenterX and CenterY specifies the center of image to be exported.
  • Resolution specifies the resolution of image in m/pix at which the image is to be exported. The user can choose different resolutions from the drop-down list available.
  • The Export Area displays the area of the exported image in pixels as well as in kilometers.
  • To redefine the export area, the user should click on‚ Redefine Export Area™ button. By default the area to be exported would be the same as the current image area. On clicking this button, the export window will be hidden and the map window will be displayed to enable the user to define a new export area by drawing a rectangular box on the image.
Parameters Tab: The second tabbed window i.e. Parameters™ enables the viewer to specify the path and the path of the exported file


  • The user can change the path for saving the exported file by clicking on the‚ Export To™ button. An open dialog box will pop up where the user can browse for the path. A .goe file is created with every export, which contains the details of exported files.
  • The user can choose one of the file types from Tiff, Bmp, Jpeg and GeoTiff (only Jpeg in case of ECW compression).
  • The user also has an option of creating world and tab files (check this capability) along with the image files.
  • In case of Jpeg, the user also has an option of defining the compression level. The compression degrades the quality of the image and clicking the Preview Button can preview the effect of various compression factors.
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