NDFF Rijkswaterstaat biotope mapping

Research method whereby roadsides and banks of ditches of national roads are surveyed for protected species that fall under the Flora and Fauna Act, belonging to species of vascular plants, amphibians, reptiles, fish, butterflies, dragonflies and invertebrates.
Dataset available via https://www.ndff.nl/english / serviceteamndff@natuurloket.nl
Positive observations without zeros
https://www.ndff.nl/overdendff/validatie/protocollen/104-002-rws-droog-biotoopkartering/

研究方法，通过对国家级公路的路肩和沟渠岸进行实地调查，以识别受《植物与动物保护法》保护的物种，包括维管植物、两栖动物、爬行动物、鱼类、蝴蝶、蜻蜓和无脊椎动物等。