Collecting some useful resources:

Land Cover Classification System (LCCS)

The Food and Agriculture Organization (FAO) of the United Nations has developed the Land Cover Classification System (LCCS), which provides a standardized way to classify land cover based on satellite imagery.

Land Cover Classification System (LCCS) | Land & Water | Food and Agriculture Organization of the United Nations | Land & Water | Food and Agriculture Organization of the United Nations

Dichotomous Phase

  1. Cultivated and Managed Terrestrial Areas
  2. Natural and Semi-Natural Terrestrial Vegetation
  3. Cultivated Aquatic or Regularly Flodded Areas
  4. Natural and Semi-Natural Aquatic or Regularly Flooded Vegetation
  5. Artificial Surfaces and Associated Areas
  6. Bare Areas
  7. Artificial Waterbodies, Snow and Ice
  8. Natural Waterbodies, Snow and Ice
Overview of the Land Cover Classification System source

Initial assessment is that this is rather good, for the intended use. It is to classify every part of the earth as to the type of land (use) there is. For the purpose of agri-culture categorisation, it is somewhat limited therefore, though it would be good to ensure alignment to some degree to this categorisation.

Another consideration is that this was created in 2000.

Here is the actual report:

LAND COVER CLASSIFICATION SYSTEM

CORINE Land Cover

The European Environment Agency (EEA) has developed the Corine Land Cover (CLC) database, which provides a consistent and harmonized classification of land cover across Europe.

CORINE Land Cover
In 1985 the Corine programme was initiated in the European Union. Corine means ‘coordination of information on the environment’ and it was a prototype project working on many different environmental issues. The Corine databases and several of its programmes have been taken over by the EEA. One of th…

Some comments

Size of the smallest unit mapped: 25 hectares

The theoretical schemetic construction of a land cover nomenclature

Corine

source

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Nomenclature: The devising or choosing of names for things, especially in a science or other discipline. The body or system of names used in particular specialist field. FORMAL: The term or terms applied to someone or something. [Source: Oxford Languages]

The CORINE land cover (at a quick glance), seems to provide four main categories, and then two more subcategory levels. Here below is a picture of it.

CORINE2
Source - p21

Here is the PDF version of this


The Global Reporting Initiative (GRI)

The Global Reporting Initiative (GRI) provides reporting standards for companies to disclose their environmental, social, and governance performance, including issues related to agriculture and land use.

GRI - Standards

This seems very comprehensive, as often is the case with international standards. The standard are meant for organisations, rather than small businesses, on the reporting of their impact on the environment.

Or as it says at the start of the GRI 13: Agriculture, Aquaculture and Fishing Sectors PDF: "GRI...provides information for organizations in the agriculture, aquaculture, and fishing sectors about their likely material topics. These topics are likely to be material for organizations in the sectors on the basis of the sectors’ most significant impacts on the economy, environment, and people, including on their human rights."

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material topics: topics that represent the organization’s most significant impacts on the economy, environment, and people, including impacts on their human rights
Note: See section 2.2 in GRI 1: Foundation 2021 and section 1 in GRI 3: Material Topics 2021 for more information on ‘material topics’.
[source]
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human rights: rights inherent to all human beings, which include, at a minimum, the rights set out in the United Nations (UN) International Bill of Human Rights and the principles concerning fundamental rights set out in the International Labour Organization (ILO) Declaration on Fundamental Principles and Rights at Work

Source: United Nations (UN), Guiding Principles on Business and Human Rights: Implementing the United Nations “Protect, Respect and Remedy” Framework, 2011; modified Note: See Guidance to 2-23-b-i in GRI 2: General Disclosures 2021 for more information on ‘human rights’.
[source]

It is hard to know where to look, as each instruction or recommendation are mostly links to other documents.

GRI Standards
GRI Standards: Universal, Sector and Topic Standards (Source GRI Standards)

The GRI standards include the following list of activities for agriculture, aquaculture and fishing sectors, and define some business relationships.

Table showing the activities for Agriculture, Aquaculture and Fishing sector
Sector activities for Agriculture, Aquaculture and Fishing Sectors - as suggested in GRI 13. but provided in RONGO Production Slide. Noted as not being exhausted list.
Table showing the Business Relationships for Agriculture, Aquaculture and Fishing sector
Business Relationships for Agriculture, Aquaculture and Fishing Sectors - as suggested in GRI 13. but provided in RONGO Production Slide. Noted as not being exhausted list.

There is a good graph in the GRI 13 on the potential relation to Sustainable Development Goals (SDG), which is yet another set of standards to review.


Other potential resources

The United States Department of Agriculture (USDA) has developed the National Agricultural Statistics Service (NASS) Crop Classification Reference List, which provides a standard classification system for crops grown in the United States.

USDA - National Agricultural Statistics Service Homepage
USDA National Agricultural Statistics Service Information. NASS publications cover a wide range of subjects, from traditional crops, such as corn and wheat, to specialties, such as mushrooms and flowers; from calves born to hogs slaughtered; from agricultural prices to land in farms. The agency has…

The World Bank has developed the Agricultural Integrated Survey (AGRIS), which provides a standardized framework for collecting data on agricultural production and land use.

AGRISurvey