# GeoNFT

A GeoNFT represents geospatial assets by extending the non-fungible token (ERC-721) contract with location information.

Geospatial data is defined as a [GeoJSON](https://www.rfc-editor.org/rfc/rfc7946) string defining a `FeatureCollection` of one or more `Features` (`Polygon` or `Point`):

```json
{
  type: "FeatureCollection",
  features: [
    {
      type: "Feature",
      geometry: {
        type: "Polygon",
        coordinates: [
          [
            [-68.8906744122505, 12.147418397582491],
            [-68.8907468318939, 12.147347599447487],
            [-68.8907213509083, 12.14723615790054],
            [-68.8905939459801, 12.147198136656193],
            [-68.89051884412766, 12.147280734524921],
            [-68.89055103063583, 12.147379065287602],
            [-68.8906744122505, 12.147418397582491],
          ],
        ],
      },
    },
  ],
}
```

Additionally, GeoNFTs contain an `Ecological Index` as a measure of ecological state:

```solidity
struct EcologicalIndex {
        string indexType;
        int256 indexValue;
}
```

The `Ecological Index` is an on-chain variable representing the value of the asset defined by the GeoNFT. A common design pattern is to fractionalize an NFT into fungible ERC-20 tokens for usage within community reserves and currencies. The `Ecological Index` could be a parameter to determine the amount of ERC-20 tokens that are created. As the `Ecological Index` changes, the supply of tokens may be responsive to this value.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://astral-protocol.gitbook.io/astral/geonft.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.