filters.overlay¶
The overlay filter allows you to set the values of a selected dimension based on an OGR-readable polygon or multi-polygon.
OGR SQL support¶
You can limit your queries based on OGR’s SQL support. If the filter has both a datasource and a query option, those will be used instead of the entire OGR data source. At this time it is not possible to further filter the OGR query based on a geometry but that may be added in the future.
Note
The OGR SQL support follows the rules specified in ExecuteSQL documentation, and it will pass SQL down to the underlying datasource if it can do so.
Example 1¶
In this scenario, we are altering the attributes of the dimension ‘Classification’. Points from autzen-dd.las that lie within a feature will have their classification to match the ‘CLS’ field associated with that feature.
{
"pipeline":[
"autzen-dd.las",
{
"type":"filters.overlay",
"dimension":"Classification",
"datasource":"attributes.shp",
"layer":"attributes",
"column":"CLS"
},
{
"filename":"attributed.las",
"scale_x":0.0000001,
"scale_y":0.0000001
}
]
}
Example 2¶
This example sets the Intensity attribute to CLS
values read from the
OGR SQL query.
{
"pipeline":[
"autzen-dd.las",
{
"type":"filters.overlay",
"dimension":"Intensity",
"datasource":"attributes.shp",
"query":"SELECT CLS FROM attributes where cls!=6",
"column":"CLS"
},
{
"filename":"attributed.las",
}
]
}
Options¶
- dimension
- Name of the dimension whose value should be altered. [Required]
- datasource
- OGR-readable datasource for Polygon or MultiPolygon data. [Required]
- column
- The OGR datasource column from which to read the attribute. [Default: first column]
- query
- OGR SQL query to execute on the datasource to fetch geometry and attributes. The entire layer is fetched if no query is provided. [Default: none]
- layer
- The data source’s layer to use. [Defalt: first layer]