In this week’s module, we learned about isarithmic mapping, flow mapping, and contour lines. We were assigned to create a map in ArcGIS Pro that displayed interpolated raster data and hypsometric tinting. The data shows inches of annual precipitation in Washington state over a 30-year period.
The data was derived and interpolated through Parameter-elevation Regressions on Independent Slopes Model (PRISM). This interpolation method uses a digital elevation model (DEM) to collect data. The DEM is an underlying grid that contains point data. The data was collected monthly from 1981 to 2010.
The data is displayed in ArcGIS in a continuous tone. Continuous tone symbology displays color shading based on the value of the point data instead of a stepped color symbology. It is implemented on this map because each color represents a range of precipitation based on data that was collected from each point in the grid DEM.
We need to show the elevation of the data on the map. To do this we created a Hypsometric Tint with the Int geoprocessing tool. Hypsometric tinting means the symbology on the map is shown with different shades between the color contours and displays distinct definitions between each color interval. It is implemented on this map to show the elevation where the data was collected.
For the final step, we added contour lines to the map by using the Contour geoprocessing tool and matching the contour values to the manual interval scale we set for the hypsometric tint.
Wow! So interesting honey! Love it!
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