Update in-situ_observation.md

docs/in-situ_observation.md

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 title: In-Situ Observation
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-  - to be discussed
+  - controversial
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 # In-Situ Observation
 
 ## 1 Definition 
 
-[observations](../observation) performed in the same [Place](../place) where a [Phenomenon](../phenomenon) occurs, normally without isolating it from other systems (its environment) or altering its pre-[Observation](../observation) state. The main [Characteristic](../characteristic) of such observations is that distance has no or only negligible (within [Uncertainty](../uncertainty)) influence on the [Value](../value) of the [Property](../property) observed. In-situ observations therefore often require either direct physical contact or small distances between a [Sensor](../sensor) and the observed [Phenomenon](../phenomenon). 
+[Observations](../observation) performed in the same [Place](../place) where a [Phenomenon](../phenomenon) occurs, normally without isolating it from other systems (its environment) or altering its pre-[Observation](../observation) state
 
 ### Notes 
-- Observations not fulfilling these conditions are considered Remote Sensing
+- The main [Characteristic](../characteristic) of such observations is that distance has no or only negligible (within [Uncertainty](../uncertainty)) influence on the [Value](../value) of the [Property](../property) observed. In-situ observations therefore often require either direct physical contact or small distances between a [Sensor](../sensor) and the observed [Phenomenon](../phenomenon). 
+- Observations not fulfilling these conditions are considered [Remote Sensing](../remote_sensing)
 
 ### Examples