Your potential salary as a GIS professional is going to vary depending on several factors such as the location of the job, the title, and your related experience. GIS jobs can pay a wide range from working for $11/hour as a GIS Intern or GIS Technician to making over 100,000 as a GIS Developer.
There are several sites you can visit to get a sense of how much a GIS job will pay, depending on the title. GIS Lounge has several articles about how to learn about what different GIS jobs pay:
In addition, Todd Barr discusses what factors affect your GIS salary potential: GIS Analyst Salary Breakdown. Be sure to read his perspective about how the term GIS can depress salaries: Money Verse [sic] Maps
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