readers.gdal
source link: https://pdal.io/stages/readers.gdal.html
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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.
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