J, B Yes I use this 'points along a breakline' method for geological fault modelling. But i have to stress, getting the breakline 'control points' appropriately spaced can be a juggling act and if you REALLY need a vertical breakline between two areas of similar values (ie to show a small step) this method isnt going to work very well. It is one of VMs major flaws, so if you are going to need a lot of breakline gridding you may have to consider other tools...surfer? spatial analyst with (gulp) arc9? I'm not sure if there is freeware for breakline grids..like GMT (??)..... but if you can find something that'll port back to an ascii grid you can then contour in VM etc etc
r -----Original Message----- From: Jakob Lanstorp [mailto:[EMAIL PROTECTED] Sent: 02 February 2005 09:34 To: Jakob Lanstorp; Belinda Davies Cc: [email protected] Subject: MI-L RE 2: MI-L Can Vertical Mapper honour breaklines? >>Can Vertical Mapper be set to honour breaklines when interpolating a TIN I have been informed by a VM specialist (mtogr) that breaklines can be implemented in VM by converting the breakline to closely spaced points. Then use the points in the interpolation. You have to know the value of the 'breakline points' and be very very careful with the distance to the other point, because the TIN interpolation might create significant under/over shots. In some cases this approach will work in others it will not. Mvh. | Regards Jakob Lanstorp Software Developer Geographical Information & IT COWI A/S Odensevej 95 DK-5260 Odense S Tel +45 99 36 77 00 Direct +45 99 36 77 86 Fax +45 99 36 77 01 Email [EMAIL PROTECTED] http://www.cowi.dk -----Original Message----- From: Jakob Lanstorp Sent: Wednesday, February 02, 2005 9:26 AM To: 'Belinda Davies' Cc: '[email protected]' Subject: RE: MI-L Can Vertical Mapper honour breaklines? No, experiment with the TIN interpolation settings is the best you can do. Northwood/Maconi/MapInfo Corp. has been told for years, to support break lines in creating of VM grids. The future is still obscure for VM, with every thing going to be converted to .NET, I think you will see no updates to VM in the next few years. Another go is data manipulation with the VM stamp method, where you stamp/merge one grid onto/into another grid. I have see environment people in my company doing very nice data manipulation with river systems by stamping different depths onto a river delta. Mvh. | Regards Jakob Lanstorp Software Developer Geographical Information & IT COWI A/S Odensevej 95 DK-5260 Odense S Tel +45 99 36 77 00 Direct +45 99 36 77 86 Fax +45 99 36 77 01 Email [EMAIL PROTECTED] http://www.cowi.dk -----Original Message----- From: Belinda Davies [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 02, 2005 7:19 AM To: [email protected] Subject: MI-L Can Vertical Mapper honour breaklines? Hi Vertical Mappers Can Vertical Mapper be set to honour breaklines when interpolating a TIN? Clipping the resulting grid is not sufficient for what I need to do. Thanks in advance Belinda --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 15097 ********************************************************************* This e-mail message, and any files transmitted with it, are confidential and intended solely for the use of the addressee. However, the information contained in this e-mail may subsequently be subject to public disclosure under the Freedom of Information Act 2000 and, unless the information is legally exempt from disclosure, the confidentiality of this e-mail and your reply cannot be guaranteed. If this message was not addressed to you, you have received it in error and any copying, distribution or other use of any part of it is strictly prohibited. Any views or opinions presented are solely those of the sender and do not necessarily represent those of the British Geological Survey. The security of e-mail communication cannot be guaranteed and the BGS accepts no liability for claims arising as a result of the use of this medium to transmit messages from or to the BGS. http://www.bgs.ac.uk ********************************************************************* --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 15098
