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When identifying WMS layer features, it may be difficult to obtain successful results.
1. Clicking Close to a feature may still not return a successful result.
2. Using the <Top-most layer> option unexpectedly returns empty results.
3. The results are incorrect.
There are a number of possible causes:
1. The success of identifying point or line features often depends on the tolerance level set, that is how many pixels can the coordinate of the Identify click be from the actual coordinates of the feature. The set tolerance may be such that a click "close" to a feature may not be close enough to return a successful result.
2. When you use the <Top-Most Layer> option the Identify Tool will only identify features from the top-most layer in the WMS service's drawing hierarchy. A result will be returned even if there are no features present.
3. Identify results for WMS layers may be incorrect if the data frame is rotated.
The causes listed above have corresponding numbered solutions given below: