ASTM E57 Feature Representation

In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Type Attributes), this format also adds format-specific attributes (Format Attributes).

Attribute Name	Contents
e57_type	This will always be e57_point_cloud.
e57_creation_datetime	Date and time that the file was created.
e57_creation_datetime_isatomicclockreferenced	This attribute will be present with a value of 1 if, and only if, the time stored in e57_creation_datetime is obtained from an atomic clock time source. Shall be either 0 or 1.
e57_extensions{}.prefix	A list of extension prefixes.
e57_extensions{}.uri	A list of the URI for each extension.
e57_format_name	Name of the format. Shall contain the string "ASTM E57 3D Imaging Data File". This is a reader attribute.
e57_guid	A globally unique identification (GUID) String for the current version of the file.
e57_library_version	The version identifier for the E57 file format library that wrote the file.
e57_geometry_index	The index of this point cloud or raster in the file.
e57_version_major	The major version number of the file format. This is a reader attribute.
e57_version_minor	The minor version number of the file format. This is a reader attribute.

Point Cloud Geometries

This format adds the following format-specific traits for point cloud geometries.

Trait Name	Contents
e57_acquisition_start	The start date and time that the data was acquired.
e57_acquisition_start_isatomicclockreferenced	This attribute will be present with a value of 1 if, and only if, the time stored in e57_acquisition_start is obtained from an atomic clock time source. Shall be either 0 or 1.
e57_acquisition_end	The end date and time that the data was acquired.
e57_acquisition_end_isatomicclockreferenced	This attribute will be present with a value of 1 if, and only if, the time stored in e57_acquisition_end is obtained from an atomic clock time source. Shall be either 0 or 1.
e57_atmospheric_pressure	The atmospheric pressure, measured at the sensor, at the time of data collection (in Pascals).
e57_description	A description of the point cloud.
e57_guid	A globally unique identifier for the current version of the point cloud.
e57_original_guids{}	A list of of globally unique identifiers identifying the data set (or sets) from which the points in this point cloud originated.
e57_relative_humidity	The percentage relative humidity, measured at the sensor, at the time of data collection.
e57_sensor_hardware_version	The version identifier for the sensor hardware at the time of data collection.
e57_sensor_model	The model name or number for the sensor used to collect the points in this point cloud.
e57_sensor_serial_number	The serial number for the sensor used to collect the points in this point cloud.
e57_sensor_software_version	The version identifier for the software used for the data collection.
e57_sensor_vendor	The name of the manufacturer for the sensor used to collect the points in this point cloud.
e57_temperature	The ambient temperature, measured at the sensor, at the time of data collection (in degrees Celsius).

Raster Geometries

This format adds the following format-specific traits for raster geometries.

Trait Name	Contents
e57_acquisition_datetime	The date and time that the image was acquired.
e57_acquisition_datetime_isatomicclockreferenced	This attribute will be present with a value of 1 if, and only if, the time stored in e57_acquisition_datetime is obtained from an atomic clock time source. Shall be either 0 or 1.
e57_associated_pointcloud_guid	The globally unique identifier for the point cloud object that was being acquired when the picture was taken.
e57_description	A user-defined description for the image.
e57_image_representation	The representation of the image. Values are visualReferenceRepresentation, pinholeRepresentation, sphericalRepresentation, and cylindricalRepresentation.
e57_raster_format	The underlying format in which the raster is stored. Either PNGRASTER or JPEG.
e57_rotation_w	The scalar part of the rotation quaternion.
e57_rotation_x	The i coefficient of the rotation quaternion.
e57_rotation_y	The j coefficient of the rotation quaternion.
e57_rotation_z	The k coefficient of the rotation quaternion.
e57_sensor_model	The model name or number for the sensor.
e57_sensor_serial_number	The serial number for the sensor.
e57_sensor_vendor	The name of the manufacturer for the sensor used to collect the image.
e57_separate_image_mask	Whether the image mask (alpha band) is stored in a separate blob from the data.

pinholeRepresentation

This format adds the following format-specific traits for raster geometries with an image representation of pinholeRepresentation:

Trait Name	Contents
e57_focal_length	The camera’s focal length (in meters).
e57_pixel_height	The height of the pixels in the camera (in meters).
e57_pixel_width	The width of the pixels in the camera (in meters).
e57_principal_point_x	The X coordinate in the image of the principal point, (in pixels). The principal point is the intersection of the z axis of the camera.
e57_principal_point_y	The Y coordinate in the image of the principal point (in pixels).

sphericalRepresentation

This format adds the following format-specific traits for raster geometries with an image representation of sphericalRepresentation:

Trait Name	Contents
e57_pixel_height	The width of a pixel in the image (in radians).
e57_pixel_width	The height of a pixel in the image (in radians).

cylindricalRepresentation

This format adds the following format-specific traits for raster geometries with an image representation of cylindricalRepresentation:

Trait Name	Contents
e57_pixel_height	The height of a pixel in the image (in meters).
e57_pixel_width	The width of a pixel in the image (in radians).
e57_principal_point_y	The Y coordinate in the image of the principal point (in pixels). This is the intersection of the z = 0 plane with the image.
e57_radius	The closest distance from the cylindrical image surface to the center of projection (that is, the radius of the cylinder) (in meters).