It is standard/normal security protocol to pixilate embassy aerial photos.
You will have to ask those who would know in the government, all I can tell you, as has already been mentioned in this topic, it is done for security
Afterall, we are talking Washington, DC......
Would you want people to know how many rooftop cameras you have? NO.
Also there may be firedoors and rooftop hatches on the rooves of Embassies.....would you want others to know about them? Probably not.
It is for security reasons.....it's all about you get what you give. If a country is very resourseful and meets many of the US's security
requirements and demands for US Embassies...then we do the same for them (edit google sat. images etc..etc..)
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