From the definitions you've quoted it seems that "reglaje" refers to surveillance of persons and "marcaje" to surveillance of places, both preparatory to committing a crime. "Casing" is the most common term used for this, but "scouting" is also quite commonly used, and both terms can apply to surveillance either of a victim or of a scene. "Casing" is usually preparatory to robbery, but it can apply to other crimes.

"case
to inspect or study especially with intent to rob"
http://www.merriam-webster.com/dictionary/case

"The behavior of someone who is casing a victim or burglary location may lawfully trigger a stop without his having evidence on his person to justify an arrest."
http://www.manhattan-institute.org/html/miarticle.htm?id=875...

"The one-week interval when accused-appellant and his co-conspirators first cased the victim's house up to the actual date of the killing underscores the presence of evident premeditation."
http://www.lawphil.net/judjuris/juri2000/mar2000/gr_109773_2...

"In 2011, New York City police stopped and questioned a total of 685,000 civilians. A high percentage of those stops were made because the suspect appeared to be casing a victim or a property, or acting as a lookout for an accomplice."
http://www.discoverthenetworks.org/viewSubCategory.asp?id=16...

"the casing of an individual, a place of business, the movements of payrolls or registered mail, etc., only supplies certain information which enables the mob to plan the crime. Casing is frequently done by men who do not participate directly in either the planning or the execution of the crime for the very good reason that no member of the mob wants to be seen near the scene of the crime before it is committed"
http://www.jstor.org/discover/10.2307/487356?uid=3737952&uid...

A more formal word used for "marcaje" is "reconnoitering", and "scouting" can also be used:

"Reconnoitering ["casing"] the place contemplated for the commission of the crime [...]
The MPC provides that reconnoitering — popularly called "casing the joint" — satisfies attempt actus reus, because "scouting the scene of a contemplated crime" clearly signals the intent to commit the crime"
Joel Samaha, Criminal Law, pp. 243, 244
http://books.google.es/books?id=2g_vqAl6SdIC&pg=PA246&lpg=PA...

You can talk about "scouting a victim". The following refers to a sexually-related murder":

"They stalked her and possibly groomed her for some time. According to some of the articles about her, Angie was known to hang out at the church parking lot down the street from her home and at a couple of nearby parks, prime grounds for someone scouting a victim."
http://www.websleuths.com/forums/showthread.php?t=34918&pp=2...

Note that "stalking" is a different phenomenon, though it can certainly be related in the case of sexual crime:
http://www.rainn.org/news-room/sexual-assault-issues/stalkin...