here's what i do to effectively display a catchment area based on an X/Y and a radius:
######################## insert into YourTable (obj) values (CreateCircle( locX , locY , Distance ) ) ######################## -----Original Message----- From: Peter Horsb�ll M�ller [mailto:[EMAIL PROTECTED] Sent: Tuesday, 27 July 2004 11:58 PM To: Rena Jones; [EMAIL PROTECTED] Subject: RE: MI-L drawing specific circles Maybe you are looking for the Buffer function If you have your table (SCANNING) with coordinates and radius in 3 columns, let's call them X, Y and RADIUS, and you have made your table mappable in the same projection as your coordinates are stored in, you can use this: 1. Open the MapBasic window 2. Enter this line followed by hitting the ENTER button Set CoordSys Table SCANNING 3. Now we'll create buffer in your table simply by buffering points in the specified location. Enter this line followed by hitting the ENTER button Update SCANNING Set OBJ = Buffer(CreatePoint(X, Y), 24, RADIUS, "m") Note that the Buffer function reads the buffer width from the RADIUS column and that it uses the distance unit "m" for meters, You could also specify "mi" for miles etc. 24 specifies how many line segments should be used to describe a circle, can be from Also note that the CreatePoint() function creates a point at the specified location read from the X and Y columns. And finally note that the objects in your table, if any did exist, are now overwritten by these buffer objects. HTH, Peter Horsb�ll M�ller GIS Developer Geographical Information & IT COWI A/S Odensevej 95 DK-5260 Odense S. Denmark Tel +45 6311 4900 Direct +45 6311 4908 Mob +45 5156 1045 Fax +45 6311 4949 E-mail [EMAIL PROTECTED] http://www.cowi.dk/gis Sidste frist for tilmelding til MapInfo Konferencen er den 6. august 2004. Tilmelding samt yderligere information kan ses p�: http://www.cowi.dk/GIS -----Original Message----- From: Rena Jones [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 27, 2004 4:14 PM To: [EMAIL PROTECTED] Subject: MI-L drawing specific circles I feel as if I've seen this before but I'm not finding what I'm looking for in the list archives. I'm doing some cluster mapping. I have X,Y coordinates and a radius which defines a circular scanning window for each cluster. Isn't there a tool in MapInfo to draw a circle using X,Y and radius? Simply drawing using the Ellipse tool around a point is not what I am looking for becuase I need them to be exact. Thanks for your help, RJ --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 12746 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 12747 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 12758
