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This document explains the Planet Field Boundary Extension to the
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[Field Boundaries for Agriculture (fiboa) Specification](https://github.com/fiboa/specification).
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[Field Boundaries for Agriculture (fiboa)](https://fiboa.org) and
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[Vecorel](https://vecorel.org) specifications.
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Planet produces fully automated field boundaries from satellite imagery for anywhere on earth. The full
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[technical specification](https://planet.widen.net/s/5vq8w5wjvf/2403.08_mar-9444-field-boundaries-technical-specification-sheet-3) explains all
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## Properties
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The properties in the table below can be used in these parts of fiboa documents:
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-[ ] Collection
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-[x] Feature Properties
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| Property Name | Type | Description |
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| --------------- | ------ | ----------- |
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| planet:micd| float |**REQUIRED** Maximum Inscribed Circle Diameter (MICD) is an intuitive proxy for the width of a field, even in case of rotated and narrow-but-curved fields. |
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| planet:ca_ratio| float |**REQUIRED** The Circumference-Area ratio (CA ratio) is calculated by dividing the circumference of a given polygon by the square root of its area. This ratio is then adjusted so that a circle corresponds to 0, and scaled so that a square corresponds to 1 |
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| planet:qa| uint8 |**REQUIRED** Quality Assessment attribute, either 0 (good, micd > 30m), 1 (quality not guaranteed, micd < 30m) or 2 (polygons intersecting data availability grid) |
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| Property Name | Type | Description |
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| --------------- | ----- | ----------- |
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| planet:micd| float |**REQUIRED** Maximum Inscribed Circle Diameter (MICD) is an intuitive proxy for the width of a field, even in case of rotated and narrow-but-curved fields. |
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| planet:ca_ratio| float |**REQUIRED** The Circumference-Area ratio (CA ratio) is calculated by dividing the circumference of a given polygon by the square root of its area. This ratio is then adjusted so that a circle corresponds to 0, and scaled so that a square corresponds to 1 |
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| planet:qa| uint8 |**REQUIRED** Quality Assessment attribute, either 0 (good, micd > 30m), 1 (quality not guaranteed, micd < 30m) or 2 (polygons intersecting data availability grid) |
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### planet:mcid
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@@ -72,9 +68,9 @@ The ‘qa’ attribute presents three values:
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| Value | Description |
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| ----- | ------------|
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| 0 | Polygons for which the validation scores are representative, i.e. with MICD > 30 m. |
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| 1 | Polygons for which the validation scores are not representative, i.e. with MICD < 30 m. The quality for these polygons cannot be guaranteed. |
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| 2 | Polygons that are intersecting the border of the data availability grid |
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| 0 | Polygons for which the validation scores are representative, i.e. with MICD > 30 m. |
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| 1 | Polygons for which the validation scores are not representative, i.e. with MICD < 30 m. The quality for these polygons cannot be guaranteed. |
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| 2 | Polygons that are intersecting the border of the data availability grid |
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The provided example illustrates four types of polygons. Polygons outside of the AOI are removed from the output. The remaining ones (depicted with solid and diagonal
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fill) intersect with the AOI and are therefore kept in the output. Polygons that are intersecting the border of the data availability grid are also kept in the output and are
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