I have seen this done with dowsing techniques and with radionics. The operator has a map and draws the outline of the area he wants to scan. Some use just a “quadrant”, then they don’t need to paint over the map. But we have today sophisticated software for free, like for example Google Maps or Google Earth, where you can draw custom maps.
Let me show you how I personally use Google Earth. Open the program and navigate to the place of interest. Zoom in on a level which permits you to see enough of the place. Select in the menu Tools and Lineal …

… then go into the tab “Polygon” and with your mouse draw a line around the island or city or street or whatever you want to scan … click finally on save.

A new dialog box appears (which is called “settings” or “properties” in english) and there you can set the name of the polygon and the color and style of the polygon. For example I like to choose a reddish color, set the style of the area to “filled” and a transparency of say 40%.

Finally I place the AetherOnePi Gui next to the area, formulate my intention in my mind and start analysis.

In this case I selected Mallorca, a island where people drinks a lot of soft drinks mixed with a lot of alcohol. Phosphoricum acidum is one of the prominent rates, which can be found in almost all soft drinks like cola. (The materia medica says … Causation.─Bad news. Grief. Chagrin. Disappointed love. Separation from home. Loss of fluids. Sexual excesses. Injuries. Operations. Over-lifting. Over-study. Shock. … and this island is best known for most of the clinical symptoms.)
Naturally it depends on your intention which level you try to scan. You can scan the past, the history of the island, or the current situation. Area scans was used in the past in agriculture, not only to get rid of parasites, but also to see which minerals the earth requires for specific plants.
Additionally you can write your notes into the description and by using HTML tags you can even insert links and images.

When you then click on the area your description appears.

By drag & drop you can move the newly created area description to a collection.

This is awesome! …Nothing makes me more happy than watching this project grow. Keep up the good work Isuret. Best regards
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