Creating total herbicide prescription map

This guide explains how to create a prescription map for total herbicide application in the CultiWise application. It covers two available methods: creating a prescription directly under the Total Herbicide category or generating a Only Crop Spray map. Both approaches produce the same result—a prescription map for applying a non-selective herbicide to your field.

How to Create a Total Herbicide or Only Crop Spray Prescription Map

To create one of these prescriptions, click the 'CREATE PRESCRIPTION' button. Then, choose either:

• Herbicide → 'Total Herbicide (Green on Brown)'
• Other Prescription Types → 'Only Crop Spray'

Note: This feature requires multispectral indices (NDVI, NDRE, EVI, etc.) or the VARI index. 

Settings Available for Creating a Prescription Map

After selecting a prescription type, you will be redirected to the prescription creation view. All available options are displayed in the left panel.

For the background, you can choose from two types of layers:

This option will display an orthophoto map generated from drone data as a background layer. No other display options are available. 

Background Layer – Vegetation Index

If you select a vegetation index as the background layer, additional display options become available:

• Select gradient map: Adjust the color scheme to represent index values.
• Index Histogram Value Slider:
• It is available for layers generated from multispectral data, allowing you to customize scale values and range for enhanced contrast and improved visual clarity.
• The histogram typically features two peaks: the first represents soil (lower vegetation values), while the second corresponds to vegetation. The slider can be adjusted to narrow the range and highlight differences more effectively

Name 

• Enter a name for your prescription map.

Note: The layer can be renamed even after creation.

The input layer serves as the base data source for generating the prescription map. By default, the areas highlighted are those containing plants, displayed using the default settings. The input layer is shown over the selected background layer. This layer consists of two values: zones to be sprayed (containing plants) and zones not to be sprayed. Several adjustment options are available to fine-tune the highlighted areas:

• Source: Select an input layer from the dropdown menu.
• Opacity: Adjust input layer transparency using the slider.
• Spraying threshold:
• Select which zones to display using the checkboxes:
• Zones to Spray: Display spray application zones.
• Zones Not to Spray: Display non-sprayed areas.
• Both: Display both sprayed and non-sprayed zones.
• By moving the slider, you can select the threshold value of the index that will be used for the prescription map creation. In simple terms, any value above the chosen threshold will be used to generate the prescription map.

Examples:

Input layer opacity set to 100%, displaying only sprayed zones.

Input layer opacity set to 50%, displaying only sprayed zones.

Input layer opacity set to 100%, displaying both sprayed and not sprayed zones.

Input layer opacity set to 100%, displaying only not sprayed zones.

Section size (m) 

• Select the section size based on your sprayer’s specifications (options range from 0.25m to 5m).

Additional buffer (m) 

• Enter a buffer size to account for potential GPS or map alignment offsets. (Tip: A small buffer reduces discrepancies between the prescription map and actual field application.)

• Select the type of spraying machine from the dropdown menu.

Rate (l/ha) 

• Enter the application dose rate in liters per hectare.

Advanced options

You can enable advanced options by selecting the 'Advanced' checkbox.

Noise filtration

This feature reduces small speckles and improves uniformity for a smoother prescription map. Options available:

• Low
• Mild
• Medium
• High

Once you’ve adjusted all settings, click 'SUBMIT'. The generated prescription map will appear under the Prescriptions section.