Looking Up Mystery Cache

You are a criminal planning a big heist. There are 6 cities that you plan to rob. Each city has 36 buildings of various heights. You cannot enter the city to look around, but can only stand outside the city and take note of the height of the buildings visible from your perspective. Your only problem is that many shorter buildings cannot be seen behind the taller ones. Your job is to stake out the city by marking down the heights of all the buildings. 

Things to remember:

• The numbers inside the black arrows represent the number of buildings that are visible from that perspective.
• Buildings vary in height from 1 to 6 floors.
• Each row/column contains the numbers 1 to 6 exactly once (like sudoku).
• Here are some examples; 
• If an arrow has a 1 then we can deduce that the closest building is 6 floors high (only one building can be seen). On the other hand, If an arrow has a 6 then we can deduce that we can see all 6 buildings (1-6 floors) from that perspective (1floor followed by 2floors, etc in ascending order)
• Contact me if there is any uncertainty about these instructions.

Note: After solving this puzzle cache, the completed 'maps' can be used to solve puzzle cache 'Looking Down' (http://coord.info/GC3PZ4N)