GeoGeek

Create Contours with Global Mapper

Global Mapper can easily obtain geographic information from different sources, in a simple way. To create contour lines anywhere in the world, you must first review the metadata. In this example data AsterGDEM used, but have a resolution of 38 meters, therefore it is not recommended to place a lower range.

Open Global Mapper, in the home screen go to Download Free Maps/Imagery from Online Sources, opens a new window with information from various servers to rise in TERRAIN DATA select ASTER Gdem v2 Worldwide Elevation Data (1 arc-second resolution) this process requires an Internet connection, but you can also use a digital elevation model stored locally, to do this, select the first option Open Your Own Data Files.

Global Mapper allows only visualize the area of interest, without the need to download the data. As a suggestion, not recommended to generate contour lines to create a TIN, DEM first download directly, then convert it to TIN (this was a concern and frequent activity performed).

Select Online Data Source to Download

Then with zooming and panning tools, navigate to the site of interest. Go to the menu Analysis select Generate Contours (from Terrain Grid).

Generate Contours (from Terrain Grid)

In the Contour Options tab, Contuor Interval section, you can customize the interval and the unit to generate the contour lines, as well as minor and major contours. Other options can set the elevation range and resolution. By default Global Mapper create contour lines based on the current screen view, but you can be changed from the Contour Bounds tab and click the button Draw a Box.

Drag a Box to Select Export Bounds

Draw a box in the study area, accept the settings in the active window to generate a new layer with contours, although this is the basic process in this activity, playing with the other options available allows for further customization of desired product.

Generar curvas de nivel con Global Mapper

To save contours and open in different applications, it is preferable to save as shapefile, for it from the toolbar click Open Control Center, select only the contours layer, then go to the menu File > Export > Export Vector/Lidar Format > Shapefile > Export Lines, select a name and directory.

One thought on “Create Contours with Global Mapper”

  1. nadhii says:

    very important technology for urban land management

Leave a Reply

Your email address will not be published. Required fields are marked *

Recent posts

  • Problems when importing an Excel table into ArcGIS
  • Create an interactive map in Google Docs
  • Symbols not showing correctly in ArcMap
  • Differences between GIS and CAD
  • View the relief of a satellite image in ArcGIS
  • Real-time wind mapping
  • QGIS 2 Manual PDF
  • How to composite satellite image bands in ArcGIS
  • Band combination list for Landsat 8
  • Download Landsat 8 satellite images
  • Download Excel template to convert between Geographic Coordinates and UTM
  • How to calculate the area, perimeter or length in ArcGIS?

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 49 other subscribers

%d bloggers like this: