>From: Fran Peck <[EMAIL PROTECTED]> >To: 'Derek Wilson' <[EMAIL PROTECTED]> >Subject: MapMarker >Date: Mon, 26 Jul 1999 15:52:15 -0700 > >Derek, >While I can't specifically address MM 5.0 (we are using 4.1), the data used >is GDT data and we have found multiple errors in both. When we used >MapMarker to geocode, we had a really high error rate placing some of my >student addresses as much as 10 - 20 blocks off, but it said they were in >the correct position. Then we got the GDT DynaMap 2000 and sure enough the >same errors. I had a specific test data set that I used, so I was able to >send it to GDT and they have made the corrections in the 9.2 version. What >they had done was take a whole range of a group of streets and assign them >the same and incorrect address range. We ended up getting 9.2 as a >replacement. We really like that MM will correct the database, but this >misplacing addresses was a real pain. An address range that far off in our >case was the difference between a student being in one service area or >another or even in the district or not! > >What I do now is geocode using MM, and use its database correction feature >to write the correct city, zip etc back to the database, then I make that >table not mappable. Then I geocode the "clean" table using a street >centerline dataset from Maricopa Association of Governments. So far that >is >working quite well. I was so disappointed with MM that I have advised my >boss not to by the next version until they start addressing some of these >poor data issues. My .02 cents worth! > >Fran Peck >Office of Research and Planning >Peoria Unified School District >6330 W Thunderbird Rd >Glendale, AZ 85306 >623-486-6099 >Fax: 623-486-6111 >Email: [EMAIL PROTECTED] > _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
