Josh and David, thanks for your answer! As I mentioned, the vector and the raster ARE same projection, I reloaded the raster topo special for this project! Raster IS registered correctly, as this is done through SureMaps, topo quad on top of quad. The other thing is that only ONE vector layer shifts, of all other base vector tables opened; I wonder if it's a problem from data creation. This really is a big fence in running this project...
Gabriela Cardenas - GIS Technician - -----Original Message----- From: David Reid [mailto:[EMAIL PROTECTED] Sent: Friday, July 18, 2003 9:59 AM To: 'Gabriela Cardenas' Subject: RE: MI-L Raster vs. vector: shift I'm no expert but have worked with a lot of rasters and digitizing. I have seen three separate issues with vectors seeming to 'shift'. 1. Sometimes commons and easy to over look if your vector and raster tables are in similar projections. Case in point raster in Lat/Long Nad 83 but vector file in Lat/Long NAD 27. Projections are very similar and easy to overlook however, visual shift is detectable especially with the Mapinfo 'Snap'. 2. Also a common trait and I think a slight bug in Mapinfo. Zoom level and raster pixel width. I've never been able to nail this one down but when digitizing a very long line, once finished and the screen is refreshed, the latter half portion of the line just digitized is off by several pixels. It would appear that adjusting zoom to a whole number reduces this effect. (ie 0.4miles instead of 0.4123, 1.0 miles rather than 0.9876 *replace miles with your desired unit) 3. Your raster just isn't registered quite accurately enough. All in all, the only permenant effect is that as noted in #2 above. Permenant in that the line is off and requires correction. Otherwise, especially in #3, once the raster is removed and the vector table either refreshed to another known good raster, or either closed, then reopened, the vector allignment will return to it's correct origin. Hope this helps some. David -----Original Message----- From: Gabriela Cardenas [mailto:[EMAIL PROTECTED] Sent: Friday, July 18, 2003 10:39 AM To: [EMAIL PROTECTED] Subject: MI-L Raster vs. vector: shift Hello dear MI listers, did anyone come across this probl in MapInfo Proff. 6.5? I have a multitude of vector files and few rasters, all in same projection. when I work with vector ONLY, I measure a certain distance between objects from different layers. The moment I open the raster, one of the vector files (the one I care about the most, the one that I am updating and trying to keep errors to a min), SHIFTS. any ideas appreciated! Gabriela Cardenas - GIS Technician -
