filters.reprojection

The reprojection filter converts the X, Y and/or Z dimensions to a new spatial reference system. The old coordinates are replaced by the new ones, if you want to preserve the old coordinates for future processing, use a filters.ferry to create a new dimension and stuff them there.

Note

X, Y, and Z dimensions in PDAL are carried as doubles, with their scale information applied. Set the output scale (scale_x, scale_y, or scale_z) on your writer to descale the data on the way out.

Many LIDAR formats store coordinate information in 32-bit address spaces, and use scaling and offsetting to ensure that accuracy is not lost while fitting the information into a limited address space. When changing projections, the coordinate values will change, which may change the optimal scale and offset for storing the data.

Example

{
  "pipeline":[
    {
      "filename":"input.las",
      "type":"readers.las",
      "spatialreference":"EPSG:26916"
    },
    {
      "type":"filters.range",
      "limits":"Z[0:100],Classification[2:2]"
    },
    {
      "type":"filters.reprojection",
      "in_srs":"EPSG:26916",
      "out_srs":"EPSG:4326"
    },
    {
      "type":"writers.las",
      "scale_x":"0.0000001",
      "scale_y":"0.0000001",
      "scale_z":"0.01",
      "offset_x":"auto",
      "offset_y":"auto",
      "offset_z":"auto",
      "filename":"example-geog.las"
    }
  ]
}

Options

in_srs
Spatial reference system of the input data. Express as an EPSG string (eg “EPSG:4326” for WGS86 geographic) or a well-known text string. [Required if input reader does not supply SRS information]
out_srs
Spatial reference system of the output data. Express as an EPSG string (eg “EPSG:4326” for WGS86 geographic) or a well-known text string. [Required]