The XV_VTDF is a viewer for TDF format files (extension to TIFF 6.0 format for storage of high-resolution satellite data). More information about TDF format and relevant topics, as well as atellite data in this format you may receive from Space Monitoring Information Support lab (Space Research Institute, Moscow, Russia),

      The XV_VTDF a Windows 3.1 program (must also run in Win95 as a 16-bit application). This package is currently freeware, and is subject to the standard disclaimer (i.e. the developers take no responsibility for any losses due to use of this software etc.).

      Unfortunately, the on-line help (file: xv_vtfd.hlp) is sufficiently outdated, and so far not included into this package. The preparation of complete on-line help is currently in progress. Hopefully it will be available in a couple of weeks . Until then, please explore the TDF viewer on your own and guess what is the commands are intended to :-). Sorry for inconvenience.

      Here is a short list of keyboard and mouse operations and other not obvious topics.

          Installation
          Keyboard
          Mouse
          Command line
          Image size
          WinG support

      Installation

      Download the XV_VTDF.ZIP file into temporary directory and unzip it. Find there setup.exe and run it from WINDOWS.


      Keyboard

      PgUp PgDn switching between image pages (AVHRR channels)
      Arrows moving the cursor around in image window
      Shift + Arrows moving the zoom window around the image
      Ctrl + Arrows scrolling status-bar left/right


      Mouse

      Left button double-click - drag rectangular region of interest. Double-click again to restore ROI to full image size

      Right button double-click - enter selection of arbitrary-shaped area of interest. Select by left-clicking the consequent points or by dragging with left button. LEFT double-click to close the area and select it. RIGHT click to cancel operation and discard area.

      Left button click/drag - point / section popup menu

      Right button drag - (if Zoom ON) move the Zoom window around the image


      Command line

      Until command-line options are documented, these are examples

      of main command-line switches:

      XV_VTDF -? - startup dialog for setting parameters

      XV_VTDF <filename> - load TDF file at startup (default size)

      XV_VTDF <filename> -x -y - load TDF file, set image size to that in the file specified

      XV_VTDF -x 512 -y 480 - set image size to 512x480


      Image size

      The XV_VTDF operates with fixed-size satellite images in TDF format. To change default image size, you may:

      1. either start program with -? option,
      2. or specify dimensions explicitly on the command line or using the TDF-file size,
      3. or edit the XV_VTDF.INI settings (ImageSizeX, ImageSizeY) for permanent change of default settings.

      Initial (default) settings are 512x512 pixel.


      WinG support

      WinG is the free Microsoft's software package for fast 8-bit graphics in Windows 3.1 environment. The package is recognized automatically and is supported by the XV_VTDF software. All you need is to install the WinG libraries on your Windows 3.1 system, and the image rendering by XV_VTDF will be significannly accelerated. The WinG libraries can be obtained from Microsoft (http://www.microsoft.com or via FTP: ftp.microsoft.com).


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