Prescriptions

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The Prescriptions tool Image:GIS_gis_Edit_19_01.png allows to create a prescription layer with recommended input rates (seeds, fertilizers), based on an existing reference layer, such as a soils map, a management zone map, a Productivity Zones map, or any other map that you would like to use as a reference for applying different inputs to different areas.


There are two conditions that must be met before using the Prescription Tool:

  • There needs to be a reference layer classified by the variable that will be matched with different input rates. For instance,
    A Soils map classified by attribute 'MUSYM', the identifier of soil map units, or a Productivity Zones map classified by 'Productiv', a field with Productivity levels. See how to Create Object Classes.
  • The project must have a 'Prescription' data structure. This data structure is made available when you install GeoAgro GIS.
    If for any reason, you are missing this data structure, you may download it from here: Required GeoAgro GIS structures.


  1. To start using the tool, Click on the Edit objects panel Image:GIS_gis_Edit_05_01.jpg, and Select the Create Prescriptions tool Image:GIS_gis_Edit_19_01.png.

    The following window will pop up. Select the layer that will be used as reference and click on Next.
    Image:GIS_gis_Edit_19_02.JPG

    Please note: The selected reference layer must have two or more classes. For more information on classifying a layer, check the section for Creating Object Classes

  2. The next window will pop up:

    Image:GIS_gis_Edit_19_04.JPG

    Rate
    : amount of input.
    Color: color scale of the polygons according to the applied rate.
    Task: name of the treatment.
    Input: element used in the treatment.
    Unit:  the measurement unit for used for the input rate.
    Border: border color for the polygons. You can choose to make them transparent.
    Save: these parameters can be saved for future use, so you don't need to re-load the information manually. You can use the Open option to load saved parameters.

  3. Once the data is entered, click on Next to continue. You will see the following window.

    Image:GIS_gis_Edit_19_05.JPG

    Class Column
    : this is a list of the existing classes on the reference layer (non-editable).
    Treatment Column: it shows the rates applied for each class. The "rates" are created in the previous step.
    Join overlapping polygons of the same class: it allows to "merge" overlapping polygons and that have the same applied rates (that belong to the same class).

    As you assign the input rates for each class, you will see how the classes are grouped together by input rate:
    Image:GIS_gis_Edit_19_06.png

    Once you are done, click on Next.

  4. The last step is to create a prescription layer where the results from the wizard will be saved.

    Image:GIS_gis_Edit_19_07.JPG

    Here you need to assign a layer name and group to which it will belong.
    The structure 'Prescription' is automatically assigned, this selection can not be modified.

  5. Click on Finish once the data is entered, and a prescription layer will be created
    Click to see full size