RE: [MI-L] polyline appears jagged

[Warren Vick, Europa Technologies Ltd.]

Title: Message

Hi Andrea,   If you're tracing an underlying raster layer, re-register the raster across a large non-earth extent.   If you're tracing a vector layer, are you drawing into the cosmetic layer? If so, I seem to recall that there is some complication with the default coordsys used. Try drawing into a new table (with the same coordsys as the layer being traced). Then, there should be no reason why the coordinate resolution should not be the same and therefore match perfectly. Good luck!   Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: Andrea Perego [mailto:[EMAIL PROTECTED] Sent: 24 March 2006 20:57 To: Warren Vick, Europa Technologies Ltd.; mapinfo-l@lists.directionsmag.com Subject: RE: [MI-L] polyline appears jagged That is exactly what is happening.  I am in non-earth metres though.  Any ideas on how I can improve on this? Regards, Andrea   From: Warren Vick, Europa Technologies Ltd. [mailto:[EMAIL PROTECTED] Sent: March 24, 2006 3:51 PM To: Andrea Perego; mapinfo-l@lists.directionsmag.com Subject: RE: [MI-L] polyline appears jagged   Hello Andrea,   If all your lines are vertical and horizontal, you may have hit the resolution limits of your chosen coordinate system. Try randomly "sprinkling" some points on to you editable layer - if they form a grid, that will confirm the theory. If this is the case, look for a more appropriate (more local) coordinate system. You may find you're using the generic lat/lon which will not give you very good resolution when working at metre level.   Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrea Perego Sent: 24 March 2006 20:22 To: mapinfo-l@lists.directionsmag.com Subject: RE: [MI-L] polyline appears jagged Thanks David, For example, if I were to do an autotrace of a pre-existing polyline, it would appear to be tracing the line exactly, but when I finish the line the result will change to a series of straight lines The red line becomes the straight-line black line.  It doesn’t matter how many nodes I add. It does the same thing when I autotrace.  Autotrace should come up with the same line, but it doesn’t.  I don’t understand what the problem is.  I assume it is some setting or other that I need to change, but what?     Cheers, Andrea     From: David Reid [mailto:[EMAIL PROTECTED] Sent: March 24, 2006 3:00 PM To: Andrea Perego; mapinfo-l@lists.directionsmag.com Subject: RE: [MI-L] polyline appears jagged   When you say "I am creating a polyline following a river"  are you digitizing over a raster?   Never the less, the results you are getting are by design, even a "smooth continus curving line" or a "wiggly line" (i like that one:) is made up of many straight line segments as you describe.   You have two options. When digitizing, add lots more nodes closer together to make the line appear smoother (when printed or even viewed at a normal zoom level they will apear smooth). But adding more nodes may not be feasable due to time limits.   Secondly, if you double click the ployline you wish to smooth, check mark the "smooth" check box, this will give more visual effect of smoothing. But the smoothness is still be related to the density of your nodes and their spacing.   HTH David Reid       -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrea Perego Sent: Friday, March 24, 2006 1:32 PM To: mapinfo-l@lists.directionsmag.com Subject: [MI-L] polyline appears jagged Hi I know this will be easy to fix, but so far I have had no luck.  I am trying to create a polyline following say a river.  As I move along the river, the line I am creating is not smooth.  It appears as a series of jagged straight line segments, not a smooth continuous curving line or a wiggly line such as a stream.  What do I need to change to be able to draw a “wiggly” line?   Thanks. Andrea   -- Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.1/291 - Release Date: 03/24/2006   -- Outgoing mail is certified Virus Free Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.1/291 - Release Date: 03/24/2006

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