RE: MI strange behaviour with imported shape files - I think I figured out the problem
Tim, I asked this question a while back. Here's what I learned: "The foot originally adopted in the U.S. was based on 39.37 inches being equal exactly to 1 meter, and thus 1 foot equal to 0.3048006 m. In 1959, however, the US officially adopted the inch as equal to exactly 2.54 cm, so under this standard 1 ft equals 0.3048000 m. This difference amounts to one part in 500,000 or 1 ft in 99.6969... miles. Since all surveying done prior to 1959 was done on the original standard, it would have been confusing to change. Therefore the original basis, now called the US Survey Foot, has been officially adopted for surveying." Then International Foot is the 1959 standard. Phil Uhl Salt Lake City -Original Message- From: Tim Warman [mailto:[EMAIL PROTECTED]] Sent: Wednesday, September 01, 1999 4:08 PM To: Mapinfo-L (E-mail) Subject: MI strange behaviour with imported shape files - I think I figured out the problem Okay, ignore the first question, the shape files appear to have been in the State Plane Coordinate System (survey feet) and I imported them as UTM. Another question that comes up though is: are survey feet the same as regular feet? Someone once told me that the US and Libya are the only two countries yet to adopt the metric system. Someone also told me that Americans don't understand irony. Cheers, Tim Tim Warman Geologist & GIS Specialist Richard C. Slade & Associates, Consulting Groundwater Geologists North Hollywood, CA 91606 (818) 506-0418 -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
MI PRO: Coordinate transformation question
Hi, Maybe one of you coordinate system gurus could help me out on this one: I a co-worker with a program called Modflow which uses a Non-Earth (origin 0,0) coordinate system. My map data is in State Plane NAD27 (we're a Lambert Conformal Conic state). I need to specify X and Y offsets for the current Modflow data so I can begin to integrate some of my State Plane data into its model. My question is: do I need to worry about a rotation? Unfortunately I wasn't able to provide Modflow with State Plane data in the beginning or else I could have avoided having to integrate these two data sets. Once I have Modflow's coordinate system corrected, I intend to save my SPC data as Non-Earth, translate it to DXF format, and plug it into Modflow. Let me know if you see any problems with my plan; or if you know a better method. Thanks for the help. Phil Uhl Salt Lake City -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
MI PRO: Weird drawing behavior
Hi, I created points from a table. The coordinate system is State Plane NAD83 (U.S. Survey feet). I know distances from these points to other features I want to draw in. As I draw these features, I'm noticing some weird behavior. I'll draw a line, double-click on it, then set its length to 17.5 ft. When I double-click on it again it says the line is 17.4 ft and there is nothing I can do to change it. Also, all the lines I draw snap to some predefined angles. Anyone know of a remedy? My system: MI Pro. ver 5.0.1 Window NT 4.0 Thanks, Phil Uhl Salt Lake City -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
MI RE: Non-Earth to State Plane
Robert, I had the same situation here. This one is a bit tricky and I didn't figure it out until someone on the list helped me. Normally you can reproject your data by doing FILE->SAVE AS (there's a projection button in the dialog box that appears). Unfortunately this won't work because there is a problem trying to reproject Non-Earth to a real projection. Here's the what you have to do: Warning: when I did this with my Non-Earth data everything already had State Plane coordinates. Whoever brought it into MapInfo originally (probably from a DXF file) didn't bother to specify it was State Plane so it became Non-Earth since that is the default apparently. If your Non-Earth data doesn't have essentially State Plane coordinates associated with it, then I really don't think this will work. 1. Find some data that is not Non-Earth; even the sample data that comes with MapInfo will do. Bring it into MapInfo. 2. Do a FILE->SAVE AS and save it in the State Plane Coord. System you want. 3. Bring that new layer in, and then export it as an MIF (TABLE->EXPORT). 4. Export your Non-Earth data to MIF, too. 5. Open the MIF file of the sample data in a text editor (like Word in Windows) and copy the line that has the coordinate information on it. It will all be on one line, about 4 lines down. It will say something like: "CoordSys Earth Projection 3, 62, "survey ft", -111.5, " 6. Open the MIF of you Non-Earth data in a text editor also and replace its coord info line with the one you copied from the sample data. Then save it. 7. Import your previously Non-Earth data (the now-altered MIF) back into MapInfo and you should be set. Hope that works for you. Phil Uhl Salt Lake City -Original Message- From: Robert Karr [mailto:[EMAIL PROTECTED]] Sent: Friday, July 09, 1999 10:05 AM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: MI: Non-Earth to State Plane Greetings All: I inherited a Non-Earth projection map with 6 tables. I now need to add some tables that are in a State Plane Projection. I'd rather convert the Non-Earth map tables to State Plane, but I can't seem to find a way to do that either in the manuals or by finding an .MBX at the Clearinghouse WEB site that would do the transformation. Whatever the method, has to be free. thanks ...Bob Robert Karr Science Research Assistant Science and Technology Division Legislative Service Bureau Michigan State Legislature 124 West Allegan, 4th Floor POB 30036 Lansing, MI 48909-7536 Voice : 517-373-3028 FAX :517-373-0171 ! ! -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED] -- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
