Imagery viewing - Drone data

This guide explains how to display and interact with drone imagery in the CultiWise application. It covers the types of raster layers generated from RGB and multispectral images, how to navigate different flight dates, and options for adjusting layer visibility and exporting data.

Viewing drone imagery

Once drone data from your flight is uploaded to the CultiWise application, it undergoes post-processing, generating raster layers. These layers are created based on the uploaded image type and the indices selected for calculation during the upload.

• The output for RGB images is an orthophoto map in true colors.
• The output for multispectral images is a map displaying the values of the selected computed index (index calculations use the light spectrum captured by the multispectral camera). 
  • The indices that can be calculated are NDVI, NDRE, and EVI.

• NDVI helps assess plant health by measuring how much red and near-infrared light plants reflect. Higher values mean healthier, greener crops.

• NDRE is great for monitoring plant stress and nutrient levels, even in later growth stages. It uses the red-edge band to detect subtle changes in chlorophyll content.

• EVI is designed for areas with dense crops, reducing the effect of atmosphere and soil background. It provides a more accurate health check for lush vegetation.

Accessing layers

• First, select the field where you want to view drone imagery.
• Then click the 'Drone data' section in the left panel of the application.
• You will now see a list of layers created for your field, including the orthophoto and the indices selected during the upload. 
  

• If multiple flight missions exist for a selected field, use the date slider on the top of the map by clicking the arrows or selecting a date. 

• Changing the date will update the displayed layers.

• The resolution of raster layers displayed depends on the quality of the captured images.
  

Note: Switching between flight dates updates the displayed drone data, but the zoom level and focal point remain unchanged.

Layer display settings

Opacity

• Adjust the transparency of the layer.

Additional settings available for indices layers:

Select gradient map

• Adjust the color scheme to represent index values. 

• 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

Note: For multispectral data layers, scale values and ranges can be customized to enhance contrast and improve visual clarity.

Downloading the raster layers 

• After the layers are generated and displayed, these rasters can be exported as a *.tiff file.