VISSIM 5.30-05 User Manual

4 View Settings
The size of an image file depends on the following:
► data format and compression (especially *.JPG)
► screen resolution and color depth
► computer and graphics card memory (especially for 3D mode)
Thus the max. file size depends on the system configuration.
If the background file you would like to open exceeds the available main
storage, a warning will be displayed. Optionally, this message provides
further loading.
In case of incorrect image display (black or white box instead of the image)
reduce the file size by either cropping a smaller section or reducing the
resolution.
After the “overview” background map has been established, other maps
(showing smaller areas in high detail) can be loaded and scaled in the same
way and then be moved to their correct position. In order to place them
correctly (in relation to the other background images) it is recommended to
create a coarse VISSIM network first, where strategic links are placed on the
main “overview” background. Place links at positions where this background
overlaps with the background to be moved into the right place. To
accomplish this it could be helpful to place some VISSIM links temporarily on
building edges. For detailed node modelling precise maps should be used.
Multiple images can be loaded simultaneously.
Once one or more background images are loaded, their visibility can be
toggled using VIEW - SHOW BACKGROUND or the default shortcut CTRL+B.
Image files may, but do not have to be stored in the same directory as the
network file (*.INP).
In the *.INI file, background file paths are saved as meta filenames
(especially #data# for current data directory). This allows to continue to use
*.INI files that reference background files in the data directory (where *.INP
resides) after the whole directory has been renamed, moved or copied to a
different place.
Loaded background images are removed, if an *.INI file is read via menu
VIEW – LOAD SETTINGS which refers to another background file itself.
4.4.3 Workflow: Scanning an Image
The following steps outline the recommended procedure for scanning maps
and plans for use with VISSIM:
102 VISSIM 5.30-05 © PTV AG 2011