GIS 5007 - Computer Cartography: Module 6: Isarithmic Mapping

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In this week's lesson we covered topics about flow maps, and isarithmic mapping. To show our understanding and expertise of this topic we are to create a map depicted with continuous tones, hypsometric tints, hill shade effect(s), and contours. Students are with data to create an isarithmic map of precipitation data for Washington State during the time frame of 1981 - 2010. The data used for this project was prepared using the PRISM interpolation method from the PRISM Group at Oregon State University. 

First, I created a map using continuous tones to show the average rainfall data, without contours and hillshade effect. We can see the smooth, continuous flow of change for the data.

Continuous Tones


Next, I used the same data to create a hypsometric map, with the hillshade effect, to display the same average precipitation data. This map shows more clear, defining changes in data verses the continuous tones map.

Hypsometric Tints

Last, I added a contour layer on top of my hypsometric tint map (with the hillshade layer turned on) to show contours between elevation changes. We can clearly see the highest averages of rainfall are consistent with the highest points on elevation. 

Final Map Result:


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