How to generate an ndvi dataset. (advanced), How to generate an ndvi dataset – Ag Leader SMS Basic and Advanced Manual User Manual

Page 130

Advertising
background image

SMS Basic and Advanced Manual

want to be included in the generation of your Profit/Loss dataset. Click the NEXT> button once you are
satisfied with the datasets that will be used for the analysis.

6.

The Grid Options dialog will now appear. This allows you to set the size of the grids that will be used to
generate your profit/loss data. Smaller grids will provide finer detail but will also take longer to process and
also may show more holes in the dataset if your input data does not provide full or complete coverage of
your field. Larger grids will process much faster but also will result in more smoothing of data thus providing
less detail in your dataset. You also can set the interpolation parameters for the generation of the results.
Here again the larger the interpolation distance the smoother your data will look but you will start to lose
detail and smaller profit/loss changes across your field. Once you have made the desired settings click the
FINISH button to generate your profit/loss dataset.

7.

The Analysis Editor will be displayed once the analysis completes, showing a preview of the spatial dataset
that was created. No editing is allowed in this editor and its purpose is more for a visual check of your results
before they are actually saved into the system. Tooltips should also display as you move your cursor over
the grid cells on the map. At this point the data has not been saved and if you click the CLOSE button your
results will be lost and you will have to re-run the analysis function to get a new analysis dataset. The
mapped attribute can be switched to show the three attributes that are created for a profit/loss dataset;
Expense, Income, and Profit/Loss. A Dataset Name entry is also provided where you can enter in a custom
name that will be used to save the dataset in the management tree.

8.

Once you are satisfied with the results displayed and you want to save them into the system, click the SAVE
button.

9.

The Management Selection dialog should now appear. Select where you would like the profit/loss dataset
saved and click the ACCEPT button.

10. You have now successfully created and saved an profit/loss dataset that can be mapped, printed, used in

another analysis function such as an input to an equation, etc.

How to generate an NDVI dataset. (ADVANCED)

Follow these steps to generate an NDVI dataset:

1.

Go to the Analysis Menu and select Analysis Wizard.

2.

The Select Analysis Type to Run dialog should now appear. Select the NDVI Analysis button from the list of
Analysis Functions. This analysis function does not support saving custom settings/setup. To run
this analysis function select either the Single Field button or the Multiple Fields button to run it.

3.

You will now see the Select Data Filters dialog which will allow you to select the data you want included in
your analysis. NDVI analysis only supports input of image (raster) datasets for the analysis process, so the
filter will automatically limit you to image datasets that you have in your system. Once you have selected
your dataset filters, click the NEXT> button.

4.

The Edit Data Filter Results dialog will now be displayed and provides a tree view of all the datasets that met
your filter selections on the previous dialog. You can remove any datasets that are listed that you do not
want to be included in the generation of your NDVI dataset. Click the NEXT> button once you are satisfied
with the datasets that will be used for the analysis.

5.

The NDVI Settings dialog should now appear. This dialog allows you to set the output grid size for the
analysis of the image as well as the settings for the color bands to use from your image to use in the NDVI
calculation.

Set Output Grid Size - Allows you to either select resolution of the raster cells that make up the
input image as the resolution to use for your NDVI dataset, or to manually enter a grid size. The
trade-off between these selections is strictly related to resolution you want the end result to have,
the time it will take to generate, and the size of the final result dataset. A finer resolution will take
longer to process and map as well as use more memory.

Select Color Bands for Processing - This analysis function takes an RGB image as an input and
not the raw NIR imagery that was originally created. That being the case you must assign the
color bands from your input image that correspond to the NIR bands of the original raw data. The
provider of the imagery files should advise which color bands ( Red, Green, or Blue) map to the
NIR band and the Visible Red Band. The default settings (Green and Red) that the dialog starts
with are the most common mapping of color bands by most imagery sources.

Once you have made the grid and band settings/selections, click the FINISH button.

6.

The Analysis Editor will be displayed once the analysis completes, showing a preview of the spatial dataset
that was created. No editing is allowed in this editor and its purpose is more for a visual check of your results
before they are actually saved into the system. Tooltips should also be displayed as you move your cursor
over the grid cells on the map. At this point the data has not been saved and if you click the CLOSE button
your results will be lost and you will have to re-run the analysis function to get a new analysis dataset. The
mapped attribute can be switched to show the result attributes that are created. For an NDVI dataset, two
attributes are created; the NDVI (dimensionless) and NIR Vigor (also known as Vigor) attributes are created
in the new dataset. A Dataset Name entry is also provided where you can enter in a custom name that will
be used to save the dataset in the management tree.

124

Advertising