Plot Crop Health and Uniformity provides plot-level measurements of vegetation indices including Normalized Difference Vegetation Index (NDVI), Normalized Difference Red Edge Index (NDRE), or Visible Atmospherically Resistant Index (VARI). This product utilizes precision aligned orthomosaics derived from high-resolution NDVI, NDRE, or RGB imagery. Specific deliverables for this product are sensor dependent.
Recommended Use Cases
Plant Growth
Canopy Development
Canopy Senescence
Crop Health
Crop Stress
Nutrient Status
Disease
Water Stress
Plot Quality
Plot Deactivation
Area of Interest Variability
Supported Crops
Any Crop
Deliverables Summary
Mosaic RGB Precision Aligned
Mosaic VARI Precision Aligned
Plot VARI and Uniformity
Mosaic NDVI Precision Aligned
Mosaic False Color NIR (NDVI) Precision Aligned
Plot NDVI and Uniformity
Mosaic NDRE Precision Aligned
Mosaic False Color NIR (NDRE) Precision Aligned
Plot NDRE and Uniformity
Requirements
General Requirements
Imagery collected following all “Data Capture Requirements”
Imagery uploaded to the FieldAgent Field created by Plot Project Setup (71200-00)
Contract Defined – Mosaic Based submitted for “Plot Crop Health and Uniformity (71203-00)” for uploaded Survey
Data Capture Requirements
Imagery Type
Visual RGB
Sentera NDVI
Sentera NDRE
Ground Sample Distance
Less than 1cm (Early-Season)
Less than 4cm (Mid- to Late- Season)
Timing by Crop
Crop
Timing/Growth Stage
Plant Size
Any Crop
Any
Any
Flight Specifications
Early-Season
Sensor
Altitude
Speed
Overlap
Flight Direction
Buffer
Heading
Gimbal Pitch
Terrain Informed
65R
150ft (46m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Zenmuse P1 (35mm)
100ft (30m)
10mph (5ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Sentera Single
50ft (16m)
6mph (3ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Double 4K (Analytics)
50ft (16m)
6mph (3ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Double 4K (Ag+)
50ft (16m)
6mph (3ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Double 4K (NDVI/NDRE)
50ft (16m)
6mph (3ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Phantom 4 Pro
50ft (16m)
4mph (2ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Phantom 4 RTK
50ft (16m)
4mph (2ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Zenmuse X4S
50ft (16m)
4mph (2ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Zenmuse X5S
50ft (16m)
4mph (2ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Mavic 2 Pro
50ft (16m)
3mph (1.5ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Mavic 3 Enterprise
50ft (16m)
6mph (3ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Zenmuse P1 (35mm)
100ft (30m)
10mph (5ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
On
Mid- to Late- Season
Sensor
Altitude
Speed
Overlap
Flight Direction
Buffer
Heading
Gimbal Pitch
Terrain Informed
65R
400ft (120m)
22mph (10ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Zenmuse P1 (35mm)
400ft (120m)
22mph (10ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Sentera Single
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Double 4K (Analytics)
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Double 4K (Ag+)
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Double 4K (NDVI/NDRE)
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Phantom 4 Pro
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Phantom 4 RTK
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Zenmuse X4S
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Zenmuse X5S
200ft (60m)
15mph (7ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Mavic 2 Pro
200ft (60m)
14mph (6ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Mavic 3 Enterprise
200ft (60m)
14mph (6ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Zenmuse P1 (35mm)
200ft (60m)
22mph (10ms)
75%
Any
40ft (12m)
Forward
-90° (Nadir)
Off
Environmental Conditions
Lighting
Imagery should be captured between the time of 3 hours after sunrise and 3 hours before sunset. Consistent lighting conditions required for best results, including avoidance of hard shadows cast over the field which cause bright spots and dark spots in the dataset.
Wind
Wind conditions should be within the specified limits of the aircraft or system being used to carry the imaging sensor.
Precipitation
There should be no active precipitation during imagery capture.
Deliverables
Analytic by Imagery Type
Analytic
Visual RGB
Sentera NDVI
Sentera NDRE
Mosaic RGB Precision Aligned (82001-01)
X
Mosaic VARI Precision Aligned (82101-01)
X
Plot VARI and Uniformity (83003-00)
X
Mosaic NDVI Precision Aligned (82102-01)
X
Mosaic False Color NIR (NDVI) Precision Aligned (82002-01)
X
Plot NDVI and Uniformity (83004-00)
X
Mosaic NDRE Precision Aligned (82103-01)
X
Mosaic False Color NIR (NDRE) Precision Aligned (82003-01)
X
Plot NDRE and Uniformity (83005-00)
X
Mosaic RGB Precision Aligned (82001-01)
Description
A Visual Red, Green, and Blue (RGB) multi-band mosaic provided at native resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: RGB (Preliminary)*
GeoTiff
Visual RGB multi-band, native resolution, and non-georeferenced raster
Mosaic: RGB
GeoTiff
Visual RGB multi-band, native resolution, and georeferenced raster
Data Attributes
Mosaic VARI Precision Aligned (82101-01)
Description
A Visible Atmospherically Resistant Index (VARI) single-band mosaic provided at native resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: VARI
GeoTiff
VARI single-band, full-resolution, and georeferenced raster
Data Attributes
Plot VARI and Uniformity (83003-00)
Description
Visible Atmospherically Resistant Index (VARI) provides an approach to assessing Crop Health using only a RGB camera. VARI uses RGB imagery or multispectral imagery with Red, Green, and Blue spectral bands. VARI was developed to correlate with canopy cover and can be used as an indicator of Crop Health when NIR imagery is unavailable (i.e., pseudo-NDVI). Uniformity describes variation at the plot-level using statistical summary of sub-plot-level data.
Deliverable List
Deliverable
Format
Description
Plot VARI and Uniformity
Shapefile, GeoJSON, CSV
Plot-level summary statistics
Subplot: VARI
GeoTiff
VARI subplot variability
Data Attributes
Plot VARI and Uniformity
Attribute
Description
Units Metric
Units Imperial
VARI <DD-Mon>
Average VARI of the plot
VARI – Median Subplot <DD-Mon>
Median of the subplot VARI
VARI – Subplot Std. Dev. <DD-Mon>
Standard Deviation of the subplot VARI
VARI – Min Subplot <DD-Mon>
Minimum of the subplot VARI
VARI – Max Subplot <DD-Mon>
Max of the subplot VARI
VARI – Subplot Range <DD-Mon>
Range of the subplot VARI
Mosaic NDVI Precision Aligned (82102-01)
Description
A Normalized Difference Vegetation Index (NDVI) single-band mosaic provided at native resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: NDVI
GeoTiff
NDVI single-band, native resolution, and georeferenced raster
Data Attributes
Mosaic False Color NIR (NDVI) Precision Aligned (82002-01)
Description
A false-color red (R) and near-infrared (NIR) multi-band mosaic provided at full resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: False Color NIR (NDVI) (Preliminary)*
GeoTiff
R and NIR multi-band, native resolution, and non-georeferenced raster
Mosaic: False Color NIR (NDVI)
GeoTiff
R and NIR multi-band, native resolution, and georeferenced raster
Data Attributes
Plot NDVI and Uniformity (83004-00)
Description
Normal Difference Vegetation Index (NDVI) is a commonly used indicator of Crop Health that is useful in differentiating a healthy crop from a stress or sensing crop or from bare soil. NDVI uses imagery containing Red and Near-Infrared spectral bands. While NDVI does not necessarily diagnose the source of crop stress, it is a useful metric to quantify variability and location of relative strong and poor crop performance. Uniformity describes variation at the plot-level using statistical summary of sub-plot-level data.
Deliverable List
Deliverable
Format
Description
Plot NDVI and Uniformity
Shapefile, GeoJSON, CSV
Plot-level summary statistics
Subplot: NDVI
GeoTiff
NDVI subplot variability
Data Attributes
Plot NDVI and Uniformity
Attribute
Description
Units Metric
Units Imperial
NDVI <DD-Mon>
Average NDVI of the plot
NDVI – Median Subplot <DD-Mon>
Median of the subplot NDVI
NDVI – Subplot Std. Dev. <DD-Mon>
Standard Deviation of the subplot NDVI
NDVI – Min Subplot <DD-Mon>
Minimum of the subplot NDVI
NDVI – Max Subplot <DD-Mon>
Max of the subplot NDVI
NDVI – Subplot Range <DD-Mon>
Range of the subplot NDVI
Mosaic NDRE Precision Aligned (82103-01)
Description
A Normalized Difference Red-Edge Index (NDRE) single-band mosaic provided at native resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: NDRE
GeoTiff
NDRE single-band, native resolution, and georeferenced raster
Data Attributes
Mosaic False Color NIR (NDRE) Precision Aligned (82003-01)
Description
A false-color red-edge (RE) and near-infrared (NIR) multi-band mosaic provided at full resolution and georeferenced.
Deliverable List
Deliverable
Format
Description
Mosaic: False Color NIR (NDRE) (Preliminary)*
GeoTiff
RE and NIR multi-band, full-resolution, and non-georeferenced raster
Mosaic: False Color NIR (NDRE)
GeoTiff
RE and NIR multi-band, full-resolution, and georeferenced raster
Data Attributes
Plot NDRE and Uniformity (83005-00)
Description
Normal Difference Red-Edge Index (NDRE) is a derivate of NDVI using the Red-Edge spectral band rather than the Near-Infrared spectral band. NDRE uses imagery containing Red-Edge and Near-Infrared spectral bands. NDRE is more sensitive to variation in Crop Stress during periods of peak canopy cover than NDVI and is best used for mid-season Crop Health assessment. NDRE is also particularly sensitive to crop nutrient stress, including crop nitrogen status. Uniformity describes variation at the plot-level using statistical summary of sub-plot-level data.
