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Ag Aerial Images
For better farming
Ag Aerial Images
For better farming
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AgAerial Images provides high resolution clear, easy to use  NDVI and NDRE  digital and printed maps for use by agriculture’s more progressive growers and agronomists. Saving time and manpower. Providing a shortcut to more thorough scouting. Confidence in your decisions requires confidence in your data

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UAV Data Collection

 We bring our UAV with multispectral camera to your farm and fly the selected fields collecting the required imagery. This will take about 45 minutes per 100 Ha. After the flight,  processing is started immediately. Accurate Ground Control Points are used to properly locate the image. Chlorophyll testing is carried out over a small sample area for calibration.

Image Processing of Digital Maps

After the flight he data is downloaded and processing is started immediately. Digital images will be available  next day and will be uploaded to your folder on Dropbox for you to download, as a calibrated, geo-referenced image file. This image file can be used immediately by you or your agronomist.

 

Agronomy Ground-truthing

 Preliminary analysis by an agronomist is available for each flight. Using the high resolution NDVI image, the grower and his agronomist can seek out and analyse areas needing attention without walking the whole field. If tissue testing or soil testing is necessary only the problem areas need to be tested. The multispectral maps are of no use without experienced analysis

Tissue and soil testing using

Tissue and soil samples can be taken from both low and high NDVI problem areas. Soils vary greatly within most fields. Using an NDVI map or yield map of a field allows more accurate sampling, while reducing the number of samples. The soil sample submitted to the laboratory and must accurately represent the field or zone sampled. Sampling is the weakest link in the soil testing chain and the greatest source of error.

Quality of data is paramount

Collecting accurate multispectral data is not that easy. 

It requires gigabytes of data from multi-lens sensors and costly industry leading software to process it. It is not possible to obtain the zone areas and percentages in tabular form and high-resolution detail in maps from third-party processors so we process ourselves.
To assure accuracy of vegetation index (NDVI) values we use a sunshine sensor to calibrate images for variations in the sunlight composition (white balance) during each flight. A small test area is then measured for NDVI values with a Greenseeker hand-held crop sensor. Average chlorophyll content* readings are also taken in this test area. This information is then used to calibrate the vegetation index values obtained on that flight. Our aim is to have NDVI values consistant to within 0.02, or 3%.

GPS without correction is not accurate enough to return to a particular spot in a field. We use a high-precision Trimble GNSS receiver to enhance the quality of our location data, so our digital maps are of industry-leading accuracy.

*NB.Chlorophyll content in leaves of wheat and rice has been found to be closely linked to nitrogen content.

Compare the AgAerial NDVI image of this cotton crop with the final yield.

Below is an NDVI image comparison of a cotton crop. Image 1 was taken   on 3 March 2018 and shows the AgAerial NDVI map after pix had been applied. Image 2 was received in late June 2018 and shows final yield.

Below is an NDVI image comparison of a cotton crop. Image 1 was taken   on 3 March 2018 and shows the AgAerial NDVI map after pix had been applied. Image 2 was received in late June 2018 and shows final yield.

The dark Blue area could indicate a higher chlorophyll content in the leaf,  and thus higher nitrogen content in the plants that doesn’t seem to have converted into higher yield in this area.

There is an upper limit of Nitrogen in the root zone where further application is uneconomical, particularly in a variable soil.

Could this mean that there was more available soil N in this area than was required, so less in crop application of Nitrogen required? Using this NDVI image your agronomist would be in a better position to make that decision.

There are many other variables that an early NDVI of a cotton or rice crop may expose in time to take action.

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