The E57 format for point cloud storage consists of two parts:
A header, which points to an XML-encoded description of the dataset, including references to where the data is stored in the file
The point data, as a linear list of records. Each point has a location and various attributes.
For more information about the specifics of E57, you can visit the libe57 website at http://libe57.org/.
You can decode
.e57 files by using
TLcdE57ModelDecoder, as shown in Program: Using
TLcdE57ModelDecoder to decode a point cloud from a
TLcdE57ModelDecoderto decode a point cloud from a
TLcdE57ModelDecoder e57Decoder = new TLcdE57ModelDecoder(); ILcdModel e57Model = e57Decoder.decode("file.e57");
The decoder produces a model that contains unspecified elements, and that can only be used for visualization.
TLcdE57ModelDescriptor contains most of the
.e57 header information.
TLcdE57ModelDescriptor also has a data type. You can use its properties to style the LIDAR data with
ILcdExpression instances in
For more information about LIDAR data styling with
How to customize the styling of a LIDAR point cloud.
The E57 format does not require that files contain a spatial reference. If available, the reference specified in the file will be used.
If the file does not contain a spatial reference, the model decoder will use its model reference decoder to determine the
Consult the class javadoc of
TLcdE57ModelDecoder for more information.
If you want to load a file that is just too big, but you still want to see something, you can use
setMaximumNumberOfPoints() to set a maximum number of points to decode.
The decoder will decode at most this number of points, taken randomly from the whole file. As such, you see a lower-resolution
version of the data.