Overview
iShare Maps / GIS Pixel Tolerance
Info Click results are returned based upon the following: when a user clicks on a map we know the pixel that they click on and, based upon the Map Pixel Tolerance and the Scale, we calculate a bounding box from which the Info click results are determined.
In the iShare Settings on the General Settings tab scroll down until you see the Web entries. Here you will see the MapPixelTolerance setting. This is entered as pixels and these get converted into co-ordinates based around the point clicked on the map. This will be scale dependant upon the current Zoom level.
The MapPixelTolerance should NEVER be set to less than 10 pixels otherwise clicking on Point symbols will not return results. Unfortunately there is a danger when clicking close to Polygon boundaries more results than desired may be returned. This is something that we are looking to resolve in future versions.
My House Precision
For Point layers the Find Nearest setting is used and a Distance, specified in metres, equates to the tolerance. For Polygon layers you need to use the Show My setting and specify TOLERANCEUNITS as METERS in the LAYER definition in the .MAP file. The tolerance (distance) is hard coded at 0.01. So the result is that a one centimetre bounding box is used around the address location.
My Nearest Precision
These should always use the Find Nearest setting for both Point and Polygon layers where the Distance, specified in metres, equates to the tolerance.