Vector Conversion Raster files are often converted to vector format. Vector entities are described by coordinates and equations such as start and end points for lines and centers and radii for circles. Different techniques are used to vector a raster file. Manual or heads up conversion requires an operator to manually digitize by tracing over the existing dots, which creates individual vectors. This is a time consuming process requiring many judgment calls by the operator.
Interactive conversion uses software to create the vector file.
The operator defines the parameters of the software and any interpretations are asked of the operator not assumed by the software. The advantage of software in this case is that an operator bases calculations and estimates on mathematical calculations by the software instead of interpretation. Automatic conversion involves the use of conversion software to automatically convert the raster image into a vector file without the assistance of an operator. Except for heads up conversion, more time is required to check accuracy of the converted file based on the original drawings. In scanning and vectoring methods interpretive errors are often made.