Introduction
For more information, please read the block description.
Block type: PROCESSING
This block converts raster data into vector data.
The input for this block should be a thematic raster with relatively few classes so that the output geometry is meaningful. Examples: outputs from the processing blocks K-Means Clustering, Land Cover or NDVI Threshold.
Supported parameters
n_sieve_pixels: Minimum number of pixels in each geometry patch. Default is 1.
Example parameters using the data block SPOT Display (Streaming) and the processing blocks K-Means Clustering.
{
"oneatlas-spot-aoiclipped:1": {
"bbox": null,
"time": null,
"limit": 3,
"intersects": {
"type": "Polygon",
"coordinates": [
[
[
18.42631,
-33.912732
],
[
18.420799,
-33.922741
],
[
18.44355,
-33.924784
],
[
18.441069,
-33.913781
],
[
18.42631,
-33.912732
]
]
]
},
"zoom_level": 17
},
"k-means-clustering:1": {
"n_clusters":8
},
"vectorising:1": {
"n_sieve_pixels": 20
}
}Output format
Output format is a GeoJSON file.
Advanced
Additional parameters
You can additionally set these parameters:
dst_crs: Output coordinate reference system. Set with the EPSG code. Default isEPSG:4326or WGS 84.src_band: Band number to use for vectorisation. Default is 1 (first band).n_connectivity_pixels: Number of connected pixels required to make a patch. Default is 4. Other possible values: 8 (includes diagonal connections).
Capabilities
Input
raster
| up42_standard | |
|---|---|
dtype | uint8 |
format | GTiff |
Output
vector
| up42_standard | |
|---|---|
format | GeoJSON |
attributes | [
"class"
] |
geometry_type | Polygon |