Paul, thanks very much for your offer. I’ve prepared an example that hopefully makes it easy to see the problem. If you extract this to a new folder c:\temp\PaulDissolve it should run without additional preparation required. The “Show Segments” operates on the shapefile before dissolving sections of a road into a single road shape. “Show Dissolved” of course shows results after the dissolve. If you draw some bounding boxes on the dissolved version at random that select no roads you will see some false positive selections before too long.
For example, if you click “Show Dissolved” then “Zoom +” three times and draw a box right below the label “Main St” that is just above and to the left of the center of the screen you should see Main St selected, even though the box does not cross Main St.
This certainly seems to be either a shapefile issue or something I’m doing wrong but I’ve tried other shapefiles with similar results and I based my example on the official bounding box sample from the doc so hopefully I am not wasting your time.
http://www.rsms.info/downloads/dissolve.zip
Again, thank you for looking at this!
Don Rahmlow
Readfield, ME
US
For example, if you click “Show Dissolved” then “Zoom +” three times and draw a box right below the label “Main St” that is just above and to the left of the center of the screen you should see Main St selected, even though the box does not cross Main St.
This certainly seems to be either a shapefile issue or something I’m doing wrong but I’ve tried other shapefiles with similar results and I based my example on the official bounding box sample from the doc so hopefully I am not wasting your time.
http://www.rsms.info/downloads/dissolve.zip
Again, thank you for looking at this!
Don Rahmlow
Readfield, ME
US
