It is quite easy to make analyses for farm management with eoMapper, the online tool for precision cultivation, forestry and urban development.
Go to www.eomapper.com and create an account. This is necessary for us to save your processes and field geometries for your future use.
Select to start a new process, in this case ‘Precision Farming’.
Chose to draw a field boundary line, in Sweden there is the alternative to use agricultural block, i.e. LPIS geometries.
Draw a field boundary, in this case half a quarter north of Presho in South Dakota, by clicking the vertexes so the line follows the field boundary and dubble klick to close the polygon.
Name the polygon as you please, in this case Presho, but it could be your Farm name and a number. Press save.
Start the process and the available imagery over the area will be analysed and cloud free images identified. The processes are made with Google Earth Engine and usually take under 1 minute to finalize. For the half quarter north of Presho there are five available images from April 1 2016 until now. At the moment only the latest scene is processed to a vegetation index (MSAVI2). Development to be able to chose between the images, to make time series analysis and for comparison between different years is on the way.
The vegetation index is shown with a brown to green legend showing bare land to lush vegetation. Use you local knowledge and decide which amount of Nitrogen that should be used per hectare dependent on the greenness of the vegetation. In this case the figures are filled for an extra spring nitrogen application. The greenest areas are considered to need less Nitrogen and more the lower the index become, the lowest index are considered to be to sparse and no fertilizer will be applied. This is hypothetical and local knowledge must be applied. Klick the next button to process the index to a Nitrogen load map.
The proportion of Nitrogen in the fertilizer can be changed and the load will be adequately recalculated. Press order for prescription file alternatives.
Press ‘Ladda ner’ to download the results in the preferred format.
We will continuously add functionality to the service, focusing on the needs of grain farmers globally.
Please contact Geografiska informationsbyrån if you have any questions, are interested in API access or have suggestions of improvements.