Raster Statistics Extraction for Microplot and Field
1. Description
This tool automatically extracts statistics metrics of any type of raster at the microplot or plot level.
2. Workflow
Step 1 - From the “Tools” menu, search and select "Raster statistics extraction for microplot" or "Raster statistics extraction for field".
Step 2 - Click on"LAUNCH".
Step 3 - Select the raster for the statistics
Step 4a - If you have selected “Raster statistics extraction for microplot” please select your microplot vector file.
Step 5b - If you have selected “Raster statistics extraction for field” please select your Field boundaries vector file.
Step 4a - For “Raster statistics extraction for microplot” please enter a Deliverable suffix.
Step 4b - For “Raster statistics extraction for field” please enter a Deliverable suffix and a Grid Size.
3. Deliverables
Statistics for microplot:
- indicesname-bandnumber-vectorfileinputsname + suffix.geojson (Ex : NDVI-b1-Microplots Trial.geojson)
- Statistics CSV + suffix.csv
Statistics for the field:
- indicesname-bandnumber-vectorfileinputsname + suffix.geojson (Ex: NDVI-b1-Field Boundaries Production.geojson)
- Statistics CSV + suffix.csv
4. Attributes
Statistics for microplot and field:
Here are the attributes of the geojson file deliverable:
- Attributes from the input vector file (parent_id, block_plot_id,… if the vector is from Aether)
- mean: Average value of the pixels inside the geometry
- median: Median of the pixels inside the geometry
- min: Minimum value of the pixels inside the geometry
- max: Maximum value of the pixels inside the geometry
- std-dev: Standard deviation of the pixels inside the geometry
- var: Variance of the pixels values inside the geometry
- count: Number of valid pixels used inside the geometry
- decile_1: decile 1
- decile_2: decile 2
- decile_3: decile 3
- decile_7: decile 7
- decile_8: decile 8
- decile_9: decile 9
- percentile_1: percentile 1
- percentile_5: percentile 5
- percentile_95: percentile 95
- percentile_99: percentile 99
Example for the deciles and percentile
- Decile 1 has 10% of the data points below it and 90% of the data points above it.
- Decile 2 has 20% of the data points below it and 80% of the data points above it…
- Percentile_1 has 1% of the data points below it and 99% of the data points above it.
- Percentile_5 has 5% of the data points below it and 95 % of the data points above it…
Info
The CSV file contains the same attributes as the geojson file + the name of the index + the number of the band (b1 by default for single band)
5. How to use the outputs
If the tool result vector is displayed it is recommended to display the spectral index map for interpretation.
To display the statistics, go to the layer panel in the Spectral index maps statistics. Click on the desired vector to open the info panel on the right. Click on the geometry you wish to know the statistics and open custom properties to display all the attributes of this deliverable.
Statistics can be downloaded and exported in multiple formats from the "Download" menu, see Download and Export Data.
The color scale can also be displayed:
