1. Description

Aether allows data storage and conversion in Local Coordinates systems for a unified visualization with data in known or global coordinate reference systems.

A Local Coordinate System is a geospatial reference system in which unique, localized position values are employed to minimize visual distortion and simplify measurement in a targeted region.

Please consult the CRS article if needed.

2. Workflow

Local coordinates can be specified during the project creation.

Step 1 - Click on "CREATE A PROJECT".

Step 2 - In the project properties, choose the global project CRS.

Step 3 - After choosing the global project CRS please click on "DEFINE LOCAL CRS".

There are three ways to define the Local CRS:

• Single local-global coordinates file (CSV)
• Separate local and global coordinates files (CSV)
• JXL file

Find below example files:

• coordinates.jxl
• Single Local global Control point.csv
• Local Control point.csv
• Global Control point.csv

1.1 Single local-global coordinates CSV file

Allows the user to embed in one single CSV file, the positions for a given point on the earth in both the global system (WGS84) and the target local coordinate system.

This CSV file must respect the following rules:

• No Header
• Must contain at least 3 points.
• The supported separator must be ",".
• Global coordinates of the GCP must be in WGS84 (EPSG:4326).
• Must have the following structure as shown in the example table below (The column must have the same order (first local coordinates followed by the WGS84 coordinates)).

1.2 Separate local and global coordinates files (.csv)

• No Header.
• Must contain at least 3 points.
• The supported separator must be ",".
• Global coordinates of GCP locations must be in WGS84 (EPSG:4326).
• Must have the following structure as shown in the example table below (The column must have the same order (first local coordinates followed by the WGS84 coordinates)): GCP Global CRS CSV.

GCP Local CRS CSV:

1.3 JXL file

Supported Projection:

Supported Datum Transformation:

Supported Geoid Model:

2. Update the local CRS of an already existing project

It is possible to define the local CRS of a project from the info panel.

To make the transformation possible, a global system must be defined previously.

With this method, Aether users can export older datasets into the local system as we now have the transformation with both systems.

3. Set the Local coordinates during Project Creation with images

Set the local coordinate during the image download of the project creation process.

As mentioned above, the global Project Coordinate Reference System must be also defined.

4. Data importation in local CRS

• Vector: The user can upload a vector file with the local CRS.
• Raster: For the moment a raster file can only be uploaded as a File in local CRS which means it will not be displayed on the map.
• Point Cloud: Not supported yet in Local CRS.

5. Data exportation in local CRS

Datasets can be exported in a Local CRS. Please click here to learn about exporting data on Aether.

In the download section, during the export, click on "Switch to Local CRS".

• Vector: The user can export in local CRS.
• Raster: The user can export in local CRS.
• Point Cloud: The user can export in local CRS using the analytics "Point Cloud geographic conversion".