This analytic automatically determines plant count and gaps through detection.
It is mandatory to see bare ground in between two plants on the map, otherwise only visible gaps will be detected.
For row crops, with 6cm of GSD and a multispectral camera, optimal corn stage will be 4 leaves, and starbud for sunflower.
With enhanced resolution, earlier stages can be targeted. The basic rule is : size of GSD <= half canopy size (from above)
For orchards and vineyards plants must be planted in rows. If canopy is closed, only gaps will be detected. Height of the plant must be > 50cm.
For palm trees, plant must be > 50 cm as well.
2. Output File Formats
Gaps are only for plants in rows and are delivered with the following attributes :
- Gap length
- Position of gaps at line end or not
Plant count are delivered with the following attributes:
- Number of plant per microplot or per field
- Number of missing plant per microplot or per field
Step 1 :
- Select the vegetation indice that will be used to process the Plant and Gap counting (by default : NDVI is selected)
Note: for RGB data sets, select VARI (the VARI indice has to be previously generated)
Select field boundaries or microplot depending on the type of projects.*
Select the rows (optional / if already vectorized)
*For Production field projects, field boundaries needs to be a vector file. You can obtain this vector in drawing an annotation which represents the field boundaries and convert it into a vector.
Step 2 :
- Fill the inter plant spacing (distance between 2 plants within the same row)
- Fill in the row spacing (distance between 2 rows)
- Click on Launch
5. How to use it
From layers panel, select Inventory layer from SURVEY DATA section , and select between plant count or gaps layers to display :
- If you display the Gap layer, it is better to also display the RGB map to locate where is the gaps. Gaps are represented by a small dots and Depending on the gap length, a specific color is displayed and associated to the legend on the right panel. the gap length can also be displayed if the dots are clicked
- If you display the Plant count layer, the vectorized field will appear. You can click on one microplot to display its plant number. Each cell will also be colored depending on the plant number