Created Scale and distance (markdown)

Scale-and-distance.md

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+The scale of a map refers to the ratio between a distance on the map and the corresponding distance in the world. In Azgaar's Fantasy Map Generator, you can customize this scale to fit the needs of your project.
+
+The map generator operates on a scale that you can adjust through the "Units" settings. The scale impacts the way distances are measured and displayed on the map. This is used for states area, routes, zones and the size of the world.
+
+## Units editor
+
+The Units settings appear following the path Menu → Tools → edit → Units or using the shortcut `SHIFT` + `Q`. Once you open the Units Editor, you see several options.
+* Distance.
+* Altitude
+* Temperature
+* Population
+In the icons at the bottom of the Units editor are more options:
+* Linear ruler on the map.
+* Curve ruler, opisometer.
+* Route opisometer.
+* Planimeter.
+* Remove all rulers.
+* Restore default unit settings.
+
+### Distance
+
+Here you can select the unit your maps are going to use. You can select from:
+* Mile (mi). This is a land mile.
+* Kilometer (km).
+* League (lg) this is a land league. Like all units, it will be used in all distances in the map, Whether sea or land.
+* Versta (vr). Russian length unit.
+* Nautical mile (nmi).
+* Nautical league (nlg).
+* Custom name.
+
+Area unit name is just to customize the name of that unit.
+
+### How to add a distance unit
+
+When you click on "custom name" a popup appears A popup will appear that says "Provide a custom name for a distance unit" and has an input field that says "type a text". Type in the name of your unit and press confirm. If you want to exit this popup without saving, press cancel.
+
+### How to change the scale of your map
+
+The value who decides how big is your map is the ratio between pixels and your distance unit. By default this ratio is: "1 pixel is 3 km" but you can change it on the slider. Accepted values are from 0.01 where your whole map is only a few tens of units (10-20 units) to 19.91. that makes your map a few something units.
+
+### Altitude
+
+The altitude section has a dropdown to select the name of the unit used for height and a slider. This measures sea depth, mountains, lake depth and more. When you click on layers preset → heightmap, the map tooltip will show the heights in the unit that you choose in altitude.
+
+The dropdown has these units to choose from:
+* Feet (ft)
+* Meters (m).
+* Fathom (f).
+* Custom name. It opens a pop with an input text field. Write your unit name and click confirm.
+
+The height exponent goes from 1.5 to 2.2 and affect higher numbers more. The default value of height exponent is 1.8. Here is an example of heights with different exponents.
+
+* Island coast. Exp: 1.5 → 11 m. 1.8 → 25 m. 2.2 → 34 m. An average of that cell above the sea level.
+* Central lands. Exp: 1.5 → 225 m. 1.8 → 665 m. 2.2 → 2819 m.
+* High mountain. Exp: 1.5 → 743 m. 1.8 → 2785 m. 2.2 → 16233 m.
+
+These heigths can vary with each map and place and can be modified on the heightmap editor too.
+
+### Temperature
+
+It lets you choose the temperature unit.
+* Degree Celsius (°C)
+* Degree Fahrenheit (°F)
+* Kelvin (K)
+* Degree Rankine (°R)
+* Degree Delisle (°De)
+* Degree Newton (°N)
+* Degree Réaumur (°Ré). The melting and boiling points of water are defined as 0 and 80 degrees.
+* Degree Rømer (°Rø). The freezing point of pure water 7.5 degrees and the boiling point of water as 60 degrees.
+
+### Population
+
+Here you can change the amount of people and population ratio live in the map.
+* 1 population point corresponds to... by default 1000. Min 10. Max 10000. This represents how many people are in the map. Any number of population in the map is represented in "population points" not in exact number of people.
+* Urbanization rate. Burg population relative to all population. This does not modify the total population or decrease rural population. It only increases the people at burgs and makes the percentage of people living at burgs higher. By default: 1. Min: 0.01. Max: 5.
+* Urban density. Average people per building in medieval fantasy city generator. By default: 10. Min: 1. Max: 200.
+
+Work in progress. 
+
+## Rulers
+
+## Routes
+
+## Grids
+
+