Copy for LLM[View as Markdown](https://docs.planet.com/data/area-monitoring/markers/bare-soil-marker/examples/)

# Bare-Soil Marker Examples

## Misclassified corn field with zero bare-soil detections

### Description

FOI=[92276701](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92276701?from=2023-01-01\&to=2023-12-31\&selected=2023-04-17\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100) claims to grow corn, but has zero bare-soil detections, which is very atypical for corn fields as shown in the main documentation. Investigation in the Area Monitoring App reveals that corn is definitely not being cultivated on this FOI.

**Key findings:**

* NDVI time-series is not similar to the NDVI profile of other corn fields.
* ARPS and S2 classification marker predicts vineyards group.
* Similarity and distance markers suggest that buffer strip (BTA) or sunflower (TRN) are grown on this FOI.

![](/data/area-monitoring/markers/bare-soil-marker/bare-soil-marker-example1.webp)

### Link

[See in Area Monitoring App](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92276701?from=2023-01-01\&to=2023-12-31\&selected=2023-04-17\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100)

## Grassland with presence of built-up land cover

### Description

FOI=[92280460](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92280460?cropId=DEMO_FR23.CL_CROP.PPH\&from=2023-01-01\&to=2023-12-31\&selected=2023-07-25\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100), despite being classified as a permanent meadow, consistently shows exposed bare soil in summer observations. Further investigation in the Area Monitoring App reveals that this permanent grassland may have been partly converted to built-up land, with visible structures now present.

**Key findings:**

* No mowing detected.
* Relatively low mean NDVI values - 0.4 with ARPS and 0.33 based on Sentinel-2 signals.

![](/data/area-monitoring/markers/bare-soil-marker/bare-soil-marker-example2.webp)

### Link

[See in Area Monitoring App](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92280460?cropId=DEMO_FR23.CL_CROP.PPH\&from=2023-01-01\&to=2023-12-31\&selected=2023-07-25\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100)

## Winter barley

### Description

FOI=[92273815](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92273815?from=2023-01-01\&to=2023-12-31\&selected=2023-07-25\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100) claims to grow winter barley.

**Key findings:**

* NDVI time-series and crop-group classification are consistent with this claim.
* There are bare-soil observations only in July and during October-December. Most probably this FOI had another crop undersown, which started to grow after winter barley was harvested. The bare-soil observations in July are from the time when there was no or very little photosynthetic vegetation present on the FOI.

![](/data/area-monitoring/markers/bare-soil-marker/bare-soil-marker-example3.webp)

### Link

[See in Area Monitoring App](https://am-pilot.sinergise.com/phoenix/scopes/DEMO_FR23/foi-view/DEMO_FR23.FOI.92273815?from=2023-01-01\&to=2023-12-31\&selected=2023-07-25\&markerContext=DEMO_FR23.MARKER_CONTEXT.1429\&validSignal=true\&layer=ARPS-TRUE-COLOR\&displayByWeek=false\&observationsPerRow=6\&padding=10\&overlays=%5B%22FOI%22%2C%22FOIs%22%5D\&pageIndex=0\&pageSize=100)