# readers.gdal

The GDAL reader reads GDAL readable raster data sources as point clouds.

Each pixel is given an X and Y coordinate (and corresponding PDAL dimensions) that are center pixel, and each band is represented by “band-1”, “band-2”, or “band-n”. Using the ‘header’ option allows naming the band data to standard PDAL dimensions.

Default Embedded Stage

This stage is enabled by default

## Basic Example

Simply writing every pixel of a JPEG to a text file is not very useful.

    [
        {
            "type":"readers.gdal",
            "filename":"./pdal/test/data/autzen/autzen.jpg"
        },
        {
            "type":"writers.text",
            "filename":"outputfile.txt"
        }
    ]

## LAS Example

The following example assigns the bands from a JPG to the RGB values of an ASPRS LAS file using writers.las.

    [
        {
            "type":"readers.gdal",
            "filename":"./pdal/test/data/autzen/autzen.jpg",
            "header": "Red, Green, Blue"
        },
        {
            "type":"writers.las",
            "filename":"outputfile.las"
        }
    ]

## Options

filename

  GDALOpen ‘able raster file to read [Required]

count

  Maximum number of points to read. [Default: unlimited]

override_srs

  Spatial reference to apply to the data. Overrides any SRS in the input itself. Can be specified as a WKT, proj.4 or EPSG string. Can’t use with ‘default_srs’ [Default: none]

default_srs

  Spatial reference to apply to the data if the input does not specify one. Can be specified as a WKT, proj.4 or EPSG string. Can’t use with ‘override_srs’ [Default: none]

header

  A comma-separated list of dimension IDs to map bands to. The length of the list must match the number of bands in the raster.