Hi, I am seeking assistance in the use of the SearchPoint and SearchRect commands in MapBasic please. My main problem is that I cannot guarantee correct or predictable results. I have a lines map and a points map. The lines maps represents a sewer system and the points map represents the access points at the ends of the lines. I am wanting to determine the points at the end of each line, so that I can verify flow direction. I have written the mapbasic code to successfully do this using the CreateCircle function and geographical analysis commands; however; it takes some 50+ hours to run in NT 4 on a Pentium III at 500mhz and 250mb RAM for 30,000 sewer lines. This equates to approx 1.8 billion comparisons. The problem I am having with the search commands is that they do not always yield correct results, and are unpredictable. As stated in the texts, the SearchPoint function relies on a pixel distance for determining points selection. This depends on zoom width. However, having specified the SearchRectangle coordinates, I would expect to overcome the use of pixels, but it doesn't seem to be the case. Any help will be greatly appreciated. Thanks in advance. ___________________________________ Regards ... John van Uitregt, GIS Analyst Logan City Council, Queensland, Australia Tel. 61-7-38265138 Fax 61-7-38080014 Email: mailto:[EMAIL PROTECTED] Web Site: http://www.logan.qld.gov.au ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.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]
