Digitization

 In between classes one of my volunteer projects was to take older maps, both handwritten and ArcMap in origin and digitize them for conversion to ArcGIS Pro and ArcGIS Online.

So for example, the below image (tiff) was a map generated with ArcMap and had handwritten notes:

When digitizing you want to have a minimum of 3 control points for a first order affine, 6 for a second order, and 10 for a third order. The higher the transformation order, the more complex the distortion can be corrected (ESRI Documentation).

For my mapping purposes, 10 points were used for the complete map. Below is a screenshot for part of the resulting digitized map in ArcGIS Online.

REFERENCES:

ESRI (2023) Overview of Georeferencing. ESRI ArcGIS Pro Documentation. https://pro.arcgis.com/en/pro-app/latest/help/data/imagery/overview-of-georeferencing.htm