Hello, I am trying to measure diversity index by using a cover type map of an area of land. The cover type map is a pdf. My plan was to somehow pull the map into GIS create a grid (1000 ft by 1000 ft). Then I am going to use a random number generator to choose the squares that I want evaluate. Once I have the squares I am going to measure the amount of border/edge of the different cover types using the measure tool. The problem is getting the pdf into arc so that I can measure the lines. If anyone has suggestions on how to go about this or another way that would work better please help me! Also I have only had entry level GIS training at this point. Thank you!