Greg Phillips wrote: > > At a MUG UK demo of Vertical Mapper recently I raised the question as to whether > orthorectification and rubber sheeting might be added to VM as a future development, > as it is the logical Raster extension to MapInfo. In my opinion that added > functionality would really extend the tools available to exclusive MapInfo users, > and it seems that having acquired Vertical Mapper that MapInfo are in the perfect > position to enhance this product.
VM is already a useful tool warp vector layers. As an experiment, I warped a layer of streets to match an orthophoto using a combination of Vertical Mapper and MapBasic. Here's the steps: 1. Create a layer of line segments drawn from a point on the photo to the corresponding point in the vector layer. 2. Determine the x and y differences of the end points and store these values in a point table where the points represent your correct locations. The x and y offset represent the error in the vector layer at each point. 3. create a grid of the x error and one of the y error. 4. Now for each node in your vector layer's objects, pick off the x and y error offsets from the grids (reverse gridding) and shift the node by those amounts in both the x and y directions. If you are consistent and get your signs right, the result comes out surprisingly well. -- - Bill Thoen ------------------------------------------------------------ GISnet, 1401 Walnut St., Suite C, Boulder, CO 80302 tel: 303-786-9961, fax: 303-443-4856 http://www.gisnet.com/ ------------------------------------------------------------ --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 8946
