How to Rhumb Line or Loxodrome in ArcGIS Pro using various Set of
Below are the major highlights if you’d like to follow along with me in this task/assignment. If you ever have any unclear thing, make sure to ping me down in the chats below. Otherwise, I wish you a #Loxodromic experience as you #Rhumb line in this exercise.
First, a #Rhumb line or #Loxodrome is a curve that crosses each #Meridian at the same angle. Following a Rhumb line covers more distance than following a #Geodesic (great circle path). Pilots or ship captains flying or sailing, in that order, follow a Rhumb line for constant track of direction.
This task will give us some knowledge/experience dealing with #Coordinate #Systems, and understanding of how #ArcGIS draws linear features, and (perhaps) a better appreciation for the dramatic differences between loxodromes and geodesics.
As we complete this task, you’ll realize that it is important to see #graticules during each step; #latitudes and #longitudes at 30 degrees increments would be the deal here. I have used the #Firefly #Grid lines found here - https://www.arcgis.com/home/item.html...
Airports data is credited to #Natural #Earth #Data - https://www.naturalearthdata.com/down...
Geodetic Densify (Data Management) tool - https://pro.arcgis.com/en/pro-app/too...
To try it out on your own, follow the following steps:
1. Prepare a dataset that contains three cities of interest (at least 5000 miles from each other and forming a rough* triangular shape) that are scattered about the globe. They should be at different #Longitudes
2. Prepare a second dataset which contains three lines, each consisting of only two endpoints. These lines should connect the three pairs of cities in the first dataset. Use the snap function so that the lines begin and end exactly at your POIs.
3. Now prepare a third dataset that contains “dense” #loxodromic lines connecting each pair of cities or POIs. You’ll need to set the #data #frame #coordinate #system to a #projection that preserves loxodromic lines as straight lines. Use the #Densify of #streaming tool to create loxodromic lines that connect each pair of cities.
4. …this step has been omitted as I did not include the #Geodesics in the task.
5. Experiment with changing the map projections to see its effect on the appearance of these lines.
6. Now select four map projections that yield interesting geodesics or loxodromes. One must be a #Mercator, and one must be an #Oblique #Azimuthal #Equidistant centered on one of your cities
7. And finally, let me know how it goes
Credits:
Music used here is provided by http://spoti.fi/NCS