Difference between revisions of "Map Transform"

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(Affine)
(Rubbersheeting)
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[[File:Hint.jpg]] This function works in the same way as the '''[[Background_Map#Adjust_a_Background_Map|Adjust a Background Map]]''' function, but it is for the map.
 
[[File:Hint.jpg]] This function works in the same way as the '''[[Background_Map#Adjust_a_Background_Map|Adjust a Background Map]]''' function, but it is for the map.
  
==Rubbersheeting==
+
==Rubbersheeting [[File:Space.PNG]][[File:Pro40px.PNG|This function is available in OCAD 11 Professional.|link=https://www.ocad.com/en/products/ocad-for-cartography]][[File:Std40px.PNG|This function is available in OCAD 11 Orienteering Standard.|link=https://www.ocad.com/en/products/ocad-for-orienteering]]==
 
Choose this command to adjust the map or a part of the map to a geo-referenced background map. The '''Rubbersheeting Transformation''' dialog appears.
 
Choose this command to adjust the map or a part of the map to a geo-referenced background map. The '''Rubbersheeting Transformation''' dialog appears.
  

Revision as of 16:42, 22 August 2012

TransformExample.PNG

Select the Transform item in the Map menu to choose one of the following functions.

Move Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.This function is available in OCAD 11 Starter.

The Move Map dialog appears. Depending on wheter you are using paper coordinates or real world coordinates (Set Scale and Coordinate System you can enter different values.

Move.PNG

With set paper coordinates enter a X and a Y value in mm. By clicking the OK button the map is moved in the desired direction.
With set real world coordinates enter a value in m for easting and northing. By clicking the OK button the map is moved in the desired direction.
Check the corresponding option to move also Background Maps, Layout Objects and Bookmarks.

hint Do not use this dialog to change the real world coordinate offset if the map is georeferenced. To move a georeferenced map, use the Center Map to Drawing Area function in the Transform submenu of the Map menu and enter the new offset.

Stretch or Shrink Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.This function is available in OCAD 11 Starter.This function is available in OCAD 11 Course Setting.

StretchShrinkExample.PNG

The Stretch/Shrink Map dialog opens.

StretchShrink.PNG

Enter a percentage value for the horizontal strech/shrink and the vertical stretch/shrink. If both values are the same, the proportions of the map are kept.
Check the corresponding boxes if you want to reflect the map horizontally or vertically.
Click the OK button when you are finished.

Mirror Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.This function is available in OCAD 11 Starter.This function is available in OCAD 11 Course Setting.

MirrorExample.PNG

The Mirror Map dialog opens, which is the same as the Stretch/Shrink Map dialog.

Mirror.PNG

Enter a percentage value for the horizontal strech/shrink and the vertical stretch/shrink. If both values are the same, the proportions of the map are kept.
Check the corresponding boxes if you want to reflect the map horizontally or vertically.
Click the OK button when you are finished.

Rotate Map Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.This function is available in OCAD 11 Starter.

RotateMapExample.PNG

The Rotate Map dialog opens.

Rotate.PNG

Enter an angle in degrees and check the corresponing option if you want to rotate objects with symbols orientated to north.
Click the OK button to finish.

Change Coordinate System Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.

The Change Coordinate System dialog opens.

ChangeCoordinateSystem.PNG

The current coordinate system is displayed in the Change map from part of the dialog.
Click the Choose button in the Into part to choose a new coordinate system. Select the system in the Coordinate System dialog and click the OK button.
The new offset is displayed in the Horizontal offset and Vertical offset fields and can be edited there, too.
Click the OK button when finished. OCAD converts every vertex' coordinate to UTM and then (if necessary) to the desired coordinate system. Due to different origins of the coordinate systems the map gets transformed (stretched/shrinked and rotated).

Affine Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.

Choose this command to adjust the whole map on background map or on grid. With this function you can geo-reference the map. The grid button must be pressed to see the grid. You can use 1 to 12 points for the adjustment. For each point you do the following:

  1. Mark a point on map.
  2. Mark the same grid point on reference (background map or grid).

When you have adjusted enough points, press the Enter key on the keyboard. The map is rotated and stretched (Affine transformation) to get the best fit for the adjustment points. You can achieve a precise adjustment with 4 adjustment points arranged in a rectangle. In this way you can compensate rotation and distortion. The horizontal and vertical scales will be adjusted individually.

Hint.jpg This function works in the same way as the Adjust a Background Map function, but it is for the map.

Rubbersheeting Space.PNGThis function is available in OCAD 11 Professional.This function is available in OCAD 11 Orienteering Standard.

Choose this command to adjust the map or a part of the map to a geo-referenced background map. The Rubbersheeting Transformation dialog appears.

Rubbersheeting.PNG

Rubbersheeting perimeter

The Rubbersheeting perimeter is an area in which the Rubbersheeting Transformation is carried out. Objects outside of the rubbersheeting perimeter are not transformed.
Click the Define button and define the perimeter by drawing a polyline on the map (one corner per click). To define a new rubbersheeting perimeter click the Remove button to remove the actual one. Click the Load button to load an exported rubbersheeting perimeter (txt-File). Click the Save button to save the current perimeter.

Rubbersheeting settings

Check the corresponding boxes if you want to transform objects with protected symbols, transform layout objects or decrease rubbersheeting towards the border of the perimeter.

Rubbersheeting points

Click the Add button and do the following steps:

  • Click a point on the map.
  • Click the same point on the reference map (grid or background map). The rubbersheeting points are shown on the map by a red and a green cross and a connection line.
  • Do the same procedure for other points.
  • Click the Transform button to transform the map. Click the Save button to save the rubbersheeting points. Click the Remove button to remove the selected rubbersheeting point. Click the Remove all button to remove all rubbersheeting points. Click the Load button to load a saved selection of rubbersheeting points.

Rubbersheeting2.PNG

Click the Close button when finished.

Rubbersheeting3.PNG

hint -Click the Undo button in the Standard Toolbar if you are not satisfied with the rubbersheeting transformation.

-Uncheck rubbersheeting points in the Used column if they should not be included in the transformation. Unchecked rubbersheeting points appear in gray color on the map.
-The rubbersheeting perimeter defines that only objects or vertices of objects within this perimeter are transformed. But it is possible that objects or vertices of objects are moved out of the perimeter by the transformation! Place rubbersheeting point pairs with the same position on the perimeter border to avoid this.
-The Affine function is much easier to handle and gives more or less the same result.

Center Map to Drawing Area

The Center Map to Drawing Area dialog appears.

CenterMapToDrawingArea.png

This function is often used to center a map drawn in OCAD Professional edition into the smaller drawing area from OCAD Standard or CS edition. OCAD moves the map offset, all objects, all background maps and all bookmarks. After this function the map is still geo-referenced. In the dialog the extent with the existing map offset is shown in grey, the extent with the new offset in blue. The green rectangle shows the drawing area of OCAD Professional edition (80x80m), the orange the drawing area from Standard edition (4x4m). If a map should be visible in all OCAD editions then the entire map must fit in the 4x4m drawing area.

The new map offset is displayed in the New map offset fields and can be edited there. Click the Center map button to move the map to the center of the drawing area. The geo-reference of the map is not changed.


Back to the Map page.