Vector Extraction from a Raster Image in Global Mapper

 

In this example of extracting vectors from a raster layer in Global Mapper, we will automatically create polygons outlining lakes from an aerial image.

Here are the steps to follow to extract a vector from a raster layer:

  1. From the Layer menu, click Create Area Features from Equal Values…
  2. Name the target layer and choose the option to extract Only Selected Color(s)
  3. Choose Select Color from Map and click on a location representing the required color
  4. Apply a Color Fuzziness value and define the extent of the extraction process
  5. Use the Digitizer to remove unwanted polygons

The extracted polygons can be exported in any supported vector file format

Using the View Shed Tool in Global Mapper

In this 3-minute video, we follow the steps for conducting a view shed analysis in Global Mapper that allows us to see the visual impact of a project like a wind or solar farm. The tool highlights the clear line of sight of a project by using elevation data, the project’s location, height, and radius.