1. First, you'll need to gather a collection of dirt photos to categorize. This dataset should be divided into two parts: training and testing.
2. The photos must then be pre-processed, such as resizing and normalizing the pixel values.
3. After that, import the VGG19 model and delete the final completely linked layer.
4. Then, you will need to add new layers to the model and train it using the training dataset of soil images.
5. Once the model is trained, you can test it on the testing dataset of soil images and evaluate the performance using metrics such as accuracy, precision, recall, and F1-score.
you can use other pre-trained CNN models like ResNet50, Inception-v3, etc. depending on the size and complexity of your dataset. You may also consider using other deep learning frameworks such as TensorFlow, Keras, PyTorch, etc.