precisions loss when writing las file

[xiaohemaikoo]

Scaling must be specified when writing las, or it loses some precisions with the default laspy parameters (

py4dgeo/src/py4dgeo/epoch.py

Line 144 in 7d74b6d

header = laspy.LasHeader(version="1.4", point_format=6)

).

Solutions could be like [this way ] (https://github.com/3dgeo-heidelberg/py4dgeo/blob/m3c2-ep/src/py4dgeo/m3c2ep.py#L198) :

        hdr.x_scale = 0.00025
        hdr.y_scale = 0.00025
        hdr.z_scale = 0.00025
        mean_extent = np.mean(outpoints, axis=0)
        hdr.x_offset = int(mean_extent[0])
        hdr.y_offset = int(mean_extent[1])
        hdr.z_offset = int(mean_extent[2])