javascript - using google maps api to show locations with multiple custom marker -

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I am a JavaScript novice, I am currently experimenting with a small Google Map based job. I have a large set of latitude and longitude, around thousands and for each set of latitude and underlined pair, I have some value that comes from some sevier's. I can catogorize each value to something like excellent, good or bad

Now what I want to do for the above scenario, shows all classified values ​​in specific latitudes and underlines and are excellent, good or good Uses different custom markers for poor price My question is, can I use the Google Maps API without any key and how can I use multiple color based custom markers to show all the latitude and diagrams?

One help would be appreciated


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