tag:blogger.com,1999:blog-3147006891212258908.post8098222269390203566..comments2024-03-23T18:07:18.124+08:00Comments on MY QGIS MALAYSIA: When to and not to use "Union"?Abbas AWhttp://www.blogger.com/profile/16258480446911971324noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-3147006891212258908.post-32149925341607518192013-12-21T18:46:29.295+08:002013-12-21T18:46:29.295+08:00Ah...you are right. Sometimes, there is a tendency...Ah...you are right. Sometimes, there is a tendency to find answers in GIS with a fine tooth comb only to realize later that one was standing too close to see the elephant. ThanksAbbas AWhttps://www.blogger.com/profile/16258480446911971324noreply@blogger.comtag:blogger.com,1999:blog-3147006891212258908.post-30741797826215406322013-12-16T21:46:06.996+08:002013-12-16T21:46:06.996+08:00Well, if you union two intersecting lines you will...Well, if you union two intersecting lines you will get four features as a result. The intersection point divides the lines. Same applies to polygons.Andriushttps://www.blogger.com/profile/15142764586526011126noreply@blogger.comtag:blogger.com,1999:blog-3147006891212258908.post-18417704643481804292012-07-21T11:08:59.428+08:002012-07-21T11:08:59.428+08:00Agreed that was why I was expecting an increase in...Agreed that was why I was expecting an increase in the number of polygons but only to the total of 27,666. This does not answer why the union resulted in 64,144 polygons.Abbas AWhttps://www.blogger.com/profile/16258480446911971324noreply@blogger.comtag:blogger.com,1999:blog-3147006891212258908.post-74529588317550811872012-07-21T05:58:47.398+08:002012-07-21T05:58:47.398+08:00The concept of union is where polygon overlap new ...The concept of union is where polygon overlap new polygon will be created. The table will then be joint. That's why the number of polygons increased.Mohd Alihttps://www.blogger.com/profile/01401512528952677159noreply@blogger.com