One of the highlights of the version 20 release of Global Mapper is a new tool for generating a 3D mesh or model from a selected LiDAR or other point cloud points. The resulting layer contains a complex vector feature comprised of an array of abutting triangles that, when displayed in Global Mapper’s 3D Viewer, take the form of a realistic three-dimensional representation of the object. As is typical with Global Mapper, the process of creating a 3D mesh is remarkably straightforward.
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:
- From the Layer menu, click Create Area Features from Equal Values…
- Name the target layer and choose the option to extract Only Selected Color(s)
- Choose Select Color from Map and click on a location representing the required color
- Apply a Color Fuzziness value and define the extent of the extraction process
- Use the Digitizer to remove unwanted polygons
The extracted polygons can be exported in any supported vector file format
Can your GIS software do all of this without extensions?
- Process LiDAR data
- Create elevation grids from filtered LiDAR
- Apply custom shaders
- Calculate cut and fill values
- Generate contour lines
Global Mapper does it all.
Download Global Mapper today: http://bit.ly/b-no-extensions
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.
Export 3D Path Profile lines of a stream in Global Mapper by following this tutorial by Blue Marble Geographics.
Download or read more about Global Mapper here.
Finding obstructions using the Line of Sight and View Shed tools in Global Mapper.