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Import/Export

Use this dialog to import and export data between application layers and various external formats.

Where do I find the dialog?

  1. Select application layer (GMI) in vertical list field
  2. Right-click and select Properties... (or double-click)
  3. Select the Import/Export... tab

Geometry Types and Properties

An application layer can contain six different geometry types, all of which can have attributes:

  • Point
  • Line
  • Text
  • Polygon
  • Triangle net
  • Point cloud

Import with properties

When you import data from external formats, both geometry and attributes are included.

We can exchange data between application layers and various external formats.

Difference Between Application Layer Types

The available options vary between:

  • Standard application layers
  • Survey application layers

Point Number Handling

Point numbers are handled slightly differently in standard application layers and survey application layers.

Standard application layers

  • Point numbers are stored in the S_OBJID property
  • Do not need to be unique
  • Multiple points can have the same S_OBJID

Survey application layers

  • Point numbers are stored in the Point-ID property
  • Must be unique
  • When importing existing point numbers with different coordinates, you must choose to keep or replace the existing point

Standard Formats

You can import data from external files using the Import button. When you import data from external data sources (SOSI, Shape, etc.), you get both geometry and properties.

Similarly, you can export data from an application layer using the Export button.

Survey Books

Gemini Terrain supports most survey books on the market today.

For standard application layers, we cannot import observations, but only calculated points and lines.

For survey application layers, we can also import observations. For conventional observations, we can also choose whether the program should automatically split set measurements into stations or not during import. In some cases, we do not want this, and then all observations in one setup will end up on the same station in Gemini Terrain. We can then split the set measurement manually afterwards.

In addition, you can also find KOF and XML here. Some of the formats are described in more detail below:

Leica DBX (via HeXML) and Leica DBX (via LandXML)

During import, you select coordinates based on the class:

  • Reference has the highest priority, followed by control and averaged.
  • Measured or other classes remain if none of the above override them.

The program also adds the LeicaPointClass attribute to the points. This can vary slightly from format to format:

  • HeXML:
  • control
  • adjusted
  • reference
  • averaged
  • measured
  • navigated
  • estimated

  • indefinite

  • LandXML version 1.0:

  • Reference
  • Control
  • Measured
  • Averaged

Scan Data

Gemini Terrain can read laser data directly with properties from LAS and PTS files. You can also set up a user-defined import for other text files containing scan data. In addition, you can also export point clouds to user-defined format.

The program supports the following formats:

Import:

  • LAS/LAZ
  • PTS
  • DBX (Leica MS50/MS60)
  • User-defined

Export:

  • LAS/LAZ
  • User-defined

User-defined format contains predefined setups for the most commonly used ASCII formats. You can also define several custom formats here.

Raster Formats

Georeferenced Photo (JPEG)

A point object with hyperlink to the image is created. Images are placed in a separate subfolder.

Elevation Model (GeoTIFF)

The raster format GeoTIFF can contain an elevation model. These are files that we can, for example, download from www.hoydedata.no, preferably as DTM - Digital Terrain Model that only contains terrain. Vegetation, buildings, etc. are not included in DTM.

Pixels with elevation information are converted to a point cloud object.

Other Formats

Gemini Terrain also has a group for some other formats. Some of these are briefly described below:

  • GMI (Gemini) This is the format for data in application layers. Old Gemini Oppmåling also used this format for projects.
  • XML Triangle nets
  • GML Only application layers with a valid GML schema can be exported to this format. Information about this can be found under Metadata.
  • GPX Points and lines can be exported to GPX format.