By Alissa Oder
The opening elevation of a Summit project is very important. Having it set near the actual ground elevation helps in many ways, for example:
Note that Ortho+Mosaic is a 2D view. Superimposition (x,y) positioning is always estimated in 2D views. It will never line up exactly, but it can be made better with the correct opening elevation in the project.
Summit does its best to find a good opening elevation for stereo projects if one isn't provided. In some types of stereo projects, such as ADS40/80/100, the provided elevation found in the project files is wrong. For ADS40, use a “Fake Control File” if a real control file doesn't exist for the project; set a point in it to the estimated average ground elevation of the project.
In an aerial project, the opening elevation method is selected in the “Average Elevation” setting located in the Project Edit dialog. There are two methods: Control File and Key-in.
• Control File automatically calculates the average Z value for points that have a Z component in the control file. It only works if there is a control file added to the project.
• Key-in lets you either key in an estimated elevation or browse for a DEM points file to calculate the value.
If you change the “Average Elevation” setting, save the project. The next time Summit opens a model in the project, it will open at the value you selected.
When the model opens much closer to ground elevation, you'll notice improvement in automatic model changes near the edge of the stereo area and the SI displays in 2D views such as Ortho+Mosaic. It will also improve other commands in subtle ways, such as the default elevation offered in Export Model Bounds:
The new Global Mapper Extension from DAT/EM Systems International connects Global Mapper® from Blue Marble Geographics® with any edition (Professional, Feature Collection or Lite) of DAT/EM's famous Summit Evolution stereoplotter. The extension is provided at no additional cost with any purchased or supported Summit Evolution license. It enables Summit Evolution to be a 3D digitizing device for Global Mapper and allows Global Mapper projects to utilize the tools of Summit Evolution.
Global Mapper is an affordable, powerful, and easy-to-use GIS application capable of displaying, converting, and analyzing virtually any type of geospatial data. Once connected, the DAT/EM Toolbar activates Summit Evolution functions directly from Global Mapper's home window. Existing DAT/EM Toolbar functions include:
- Settings for Summit Evolution
- Sync Global Mapper data with Summit
- Superimposition of the data vectors on the stereo imagery
- Panning options
- Display options
- 3D line and spot elevation drawing word – word
- And more…