Manipulate Map Layers

FieldAgent - Manipulate Map Layers

This page describes the process for manipulating map layers. These tools are important for understanding and telling the story of a field.

This video covers some of the same content:


Note there are differences in the experiences of FieldAgent on Desktop and Web. Both are listed below separately. 

FieldAgent Web

Selecting a Map Layer

1. Navigate to the field where you would like to view a map layer.
2. Select the map layers icon  in the Map Layers section on the left.


3. Locate and select the map layer you'd like to view & manipulate.


Satellite map layers are available on the web, but have different functionality than drone survey layers.
Learn more about viewing and manipulating satellite map layers on the web

Manipulating a Map Layer

Click on a selected map layer to view the map details page.
This page provides options for editing how the map layer is displayed.


On the Map Details page, you'll see sections on the left for:
  1. Mosaic Details
  2. Mosaic Display Mode
  3. Colorization
  4. Clip to Field Boundary
  5. Opacity
  6. Download Files
Below we'll walk through each of the sections.

Mosaic Details

The mosaic details lists the name and date of the survey. Click the pencil icon  to edit the name of the map layer.

Display Mode

There are two options for display mode.
Imagery is the standard map layer with every pixel captured shown -- think high detail.

Zone Map groups similar pixels together and simplifies the map to highlight trends in the field.


Note: Real Color (RGB) map layers will not have display mode options.

Colorization

Colorization options are:
  1. number of bins
  2. max/min sliders
  3. equal area/equal spacing
  4. color scale
  5. see more (button for area of each color)
Each pixel in a map layer has a value.
All values from all pixels are shown in the histogram (graph) within the Colorization section.
For NDVI and NDRE, these values fall between -1 (most dead) and 1(most alive).
All colorization options involving changing how the values of the histogram are displayed.


Number of bins changes how many colors the values of the graph are divided into. If 12 bins are used, the imagery will be divided into 12 colors. The more colors, the more detail, which is not always best.

Max/Min sliders change which pixels are included in the colorization process. If minimum is drug to the right, the most stressed areas of a field (for NDVI) will not be included in the map. By setting the min and max, specific areas of a field can be highlighted.

Equal Area/Equal Spacing sets how the values are divided. Equal area gives each color the same number of pixels on the field. Equal spacing sets a spacing of the x axis to equal intervals and colors the pixels as they fall in these intervals.

Simply put:
Equal area is useful for highlighting the best or worst areas of a single map layer.
Equal Spacing is useful for comparing map layers from day-to-day or across different geographic locations.

The Color Scale changes which colors are used in visualizing the map. The default color scale is red to green, so the lowest value pixels are displayed as red and the highest value pixels are displayed in green. In a default health map, the healthy plants are displayed as green.

Below are some examples of how the colorization options can be used to highlight specific locations in the field.

Highlight the Best Area
Bins: 1
Min/Max: Minimum slider moved to the right
Color Scale: Red -> Green color


Click show more under the slider to view the highlighted number of acres


Highlight the Worst Area
Bins: 1
Min/Max: Maximum slider moved to the left.
Color Scale: White -> Red


Highlight/Contrast the Best vs. Worst Areas
Display Mode: Zone Map
Bins: 2
Area Type: Equal Area
Color Scale: Red -> Green


Clip to Field Boundary

This option constrains the displayed image to the field boundary. Turning this off will show the extent of the map layer captured.

Opacity

Opacity is useful when either the background map or another map layer should be seen through the top most map layer. Lower the opacity to "see through" the selected map layer.

Download Files

Many options for downloading files exist at the bottom of the page. Use these to download the files you need.

FieldAgent Desktop

There are a few features in FieldAgent Desktop that are not available in FieldAgent Web.
1. Open Field View tab, then click Field Boundary, select the survey, and then select the Full Mosaic.
2. Select the NDVI/NDRE Toolbox from the field window.

3. Use the slide bars within the window similar to the functionality in FieldAgent Web, such as Color Map, Bins, Value, Equal Area.
4. To view statistics, select a shape file, then within the Statistics area, select average, minimum, and maximum values.
Note: The statistics numbers may vary due to the numbers within the toolbox reflect the entire field,  in the field reflect the statistics within the shape.
5. To create a management zone, adjust the Zone Details and Gap Adjustments if necessary, then click the gear icon to generate zones.
6. To export the management zones as a shape file, click the Export icon. The file can then be imported into a farm management tool.



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