Knowledge Base

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Moving and Resizing - Forestry Cut Block Example

Updated May 31, 2023

Forestry Cut Block Layout Example

This example demonstrates how to overlay a series of traverses on a scanned contour map. These traverses were entered in the Survey Module; however, they could have come from other sources.

1. File | Open. Change Files of Type to (All Supported Files *.asc; *.ter; …). Select <Terrain>\ Bitmap\setting boundary shift.terx.

Figure 1: Setting Boundary shift.terx - Surveyed Traverses

The terrain file setting boundary shift.ter includes several block boundaries, roads and streams. Notice that the traverses are in correct positions with respect to each other. These traverses were entered and adjusted in the Survey/Map Module.

2. Home | Insert File. Change Files of type to Image Files (*.tif: *.jpg; *.bmp; *.sid; *.jp2; *.png;*.ecw; *.doq;….).
   Select File Name: <Terrain>\Bitmap\setting.BMP. Press Open.
3. The Import Options dialogue box appears. Ensure that the default settings are set (X and Y are set to 0.0 for Pixels Project Units and the X and Y are set to 1.0) as shown below. Press OK to insert the bitmap. 
4. Press Continue to the warning about the coordinate system as undefined. 

Figure 2: Import Options Dialogue Box

Figure 3: Plan Window After Adding setting.bmp

The bitmap file was created from a 1:5000 topographic map. The image was scanned and saved as a Windows Bitmap (*.bmp) using external software.

The bitmap is not correctly positioned with respect to the traverses (MICHELLE LAKE is offset) (See figure above). The size of the bitmap image is also incorrect. The next steps show how to adjust the position and size of the bitmap by trial and error (although it is possible to be more analytical if you know the pixel size and the coordinates of one corner of the scanned image).

Using the lakeshore to tie into the traversed streams,

4. Select the bitmap by left-clicking on its boundary with Selection cursor.
5. Feature Tools | Move, Size, Rotate. This activates Move/Size mode with the bitmap selected. The cursor changes to the Move cursor when it is inside the image. Zoom out several times to see the handles.
6. With the Move cursor displayed, left-click and drag to position MICHELLE LAKE so that the stream traverses line up with the lakeshore. Release the left mouse key to redraw the screen.

The bitmap image is too large to match with the traverses. The next step will reduce the size of the bitmap.

7. Still in Move/Size mode, hold down the <Ctrl> and press the <Down Arrow> on the keyboard. Notice that when the screen refreshes the bitmap image is smaller. Pressing the <Ctrl + Up Arrow> will expand the image, and <Shift + Ctrl + Arrow keys> allows for fine adjustments.

Figure 4: Lining Up Michelle Lake with Streams by Trial and Error

8. Repeat the above two steps until the lakeshore lines up with the traversed streams as in the figure above. This procedure involves some trial and error to adjust both the size and position of the bitmap. Zoom In/Out are useful in this process.

Information about the bitmap can be displayed and modified. This can be useful for rotating, scaling and positioning a bitmap using explicit coordinates.

9. With the bitmap still selected, activate the Image Options dialogue box: Feature Tools |Feature Properties button.

Figure 5: Image Options Dialogue

Note: The X and Y pixel sizes. The default size of bitmap pixels is 1. The coordinates of the upper left corner are 0,0. These defaults were changed when the bitmap was moved and sized in the previous example. This dialogue box can be used to explicitly set the rotation, size and position of a bitmap.

10. Press the Cancel button.
11. File | New. Do not save changes.