Hey Everyone, Here is the solution to the problem. Kudos to Jason Birch for solving this one.
Create an attribute called is_rectangle on the rectangle dataset with an initial value of 1. Create an attribute called is_data on the data extents dataset with an initial value of 1. Set the Group By on the AreaOnAreaOverlayer to Flightline_ID (the attribute has to have the same name in both data sets (or be renamed earlier in the flow). Run a tester with the following parameters: - All must pass - is_data != 1 - is_rectangle = 1 The "Passed" output should contain your empty areas, with the Flightline_ID intact so you can fanout on this attribute if you want separate outputs for each flightline. --- In [email protected], "mrmcclurg" <[EMAIL PROTECTED]> wrote: > > Hi Everyone, > > I'm trying to develop a tool that will allow me to extract areas where > two polygons DON'T overlap, this will be used to see where data > coverage does not exist. > > Let me break it down: > > We have a rectangular block of where data should be, and usually is, > however, we also have a data extents layer, which shows us exactly > where our lidar data goes to. What I need to do is to extract the areas > from the rectangular block where the data extents DO NOT exist, and > this also has to be compared one row at a time. Each line will have a > specific flightline number to compare to. We cannot compare a > rectangular block from one flight line, with the data extent of another. > > Any suggestions on where to start? > > Mark > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/fme/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/fme/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
