This document describes the procedure for defining & placing raster data in a full-size working environment within MicroStation I/RAS B.
If you want to use full-size units when you edit the scanned image of a drawing, you can create a full-size working environment with MicroStation I/RAS B. This enables you to edit the raster image of the drawing using the exact scale and units of the original.
If your drawing depicts dimensions that exceed the physical drawing size (if the scale uses miles, for example) you cannot scale the raster image of the drawing to a large enough size in MicroStation I/RAS B to use true measurements when you edit the raster file. Therefore, any dimensions or distance measured in raster units would not match the scale of the original hardcopy drawing.
If you want to work in a full-size environment, it can be very time-consuming to convert every measurement or raster item dimension from raster units to drawing dimensions with a conversion factor. The solution is to set the working units of the design file to match the linear units in your drawing. The working units can be anything from feet to miles, depending on your needs. Then, load the scanned drawing with precision key-in commands so that the drawing units match the working units. This enables you to work on the raster file using the same dimensional units to create the drawing.
For this procedure you must:
Note: Your raster file should be set to display all measurements and item sizes in full-size units.
Assume you have a drawing with the following characteristics:
To load this raster file into a full-size environment:
xy=0,0 (upper-left corner)xy=300,-200 (lower-right corner)
These key-in commands place the raster file such that all measurements taken and all raster items added assume the dimensional units of the original drawing. This technique enables you to place a raster file at a specific location within the design plane that mirrors the scale of the original drawing.
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