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How to show areas of overlap of two contour maps in Surfer 13

I communicated with a user recently who wanted to find the area of overlap of one specific contour line on one contour map with a specific contour line on another contour map. In his case the first contour map was temperature and the second was rainfall. He wanted to find the area where temperature was above one value and rainfall was above another value. Whether this was for agriculture or for some other purpose I’m not sure, but it got me thinking that there could be many applications for a use like this. For example, you may have a contour map of density of one endangered species, and another for a second endangered species, and you’re trying to identify high populations of both in order to create a wildlife refuge. Or maybe you have population of people on one contour map and energy use on another, and you want to find areas with low population but high energy usage so you can send conservationists into that area to notify the population of smart practices. The uses are endless!

So that said, below are the steps to determine the area where two specific contour levels on two different maps intersect. In this case, I’ll be finding the area in Colorado where temperature is greater than 12oC and precipitation is less than 50 hundredths of inches, which may indicate an area that is more prone to wildfires. The data used in this article was obtained from NOAA. January 2015 – November 2015 data was averaged and then gridded in order to produce the attached grids.

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Recent Comments
Guest — Leo
How did u add the legend at the bottom.?
Saturday, 16 September 2017 10:29
Katie Yoder
Hi Leo, Surfer does not support the creation of standard legends for contour maps so the legend at the bottom of this map was cre... Read More
Monday, 18 September 2017 09:49
Guest — Leonard
Ok, thanks Katie. Is it possible to overlay more than two maps, maybe three or four? Trying to produce a groundwater potential ma... Read More
Tuesday, 19 September 2017 06:00
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Gridding and Contouring Airborne Geophysical Survey Data

Golden Software recently hosted a training class on gridding and interpolating data in Surfer. Before the class was held, a user asked if we’d specifically cover the best options for gridding airborne geophysical data. At the time, it was not in the schedule, but as I looked at the data I thought this type of data could be very common and would make a great example. In this type of data, the data is taken in lines, where the data points along the lines are much closer together than the spacing between the lines.  Users generally want to interpolate the data to create a smooth color-filled image map while maintaining the data at sufficient resolution to show important anomalies.

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Recent Comments
Guest — Pascual Benito
Thanks for sharing this example. I had one comment that users may want to consider or keep in mind. Generally I had the understand... Read More
Tuesday, 12 April 2016 00:24
Kari Dickenson
You are correct that one degree of latitude is not the same as one degree of longitude. As you say, you could do the conversion ... Read More
Tuesday, 12 April 2016 10:22
Guest — Michael
Great Post! Very helpful as I am gridding with similarly acquired ground data. It seems like this whole workflow could be automate... Read More
Sunday, 10 April 2016 17:54
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