In the previous article, How to use Landsat Images ( Free ) with ArcGis (ArcMap) for
NDVI, we have dealt with the calculation and display of the NDVI
index with ArcMap.
Here, we will discuss how to achieve the same operation
with ArcGis Pro. We will start by using the composite image , created with the
tool ” Composite channels ” also directly available at the ArcGis Pro
“Geoprocessing” window.
We will discuss :
- how to display the NDVI by using the raster function
- how to create and assign a customized symbology to the calculation resulting layer
How to display the NDVI in the ArcGis Pro mapping window
Once the composite image has been loaded in ArcGIS Map Pro, you can view
the NDVI by following the following operations:
- In the ribbon , select “Analysis”
- Click the Raster Functions button
By selecting the NDVI icon , the setting window
of the bands is displayed
Enter 1 for the red band and 4 for the infrared.
The NDVI is added to the Map window .
How to create a customized style for ArcGis Pro
While the use of toolboxes between ArcMap and ArcGis Pro is similar regarding
the styles it is necessary to spend some time learning how to manage them with
ArcGis Pro.
Yet, one must find where to manage the styles. As all the elements related
to the project , this is performed in a Project window.
To open a Project window, go to the VIEW tab of the ribbon , and click on the
“Project” -> Project View icon .
A Project Window opens :
By
double- clicking styles, the different styles available appear. By default,
there is always a project style linked (Favorites) you can edit / edit .
To create our color gradient:
Click to select the Favorites
In the ribbon , click on “New item”, then on ” Color scheme”
Click
on the new style that has just been created and select the Properties tab at
the bottom of the project window. The properties of the gradient are displayed
.
We
will create the same color gradient as in the previous article:
In
” Color scheme type” select “Multipart Color scheme”
Click
on the “ADD” button to add the first part of the gradient .
Click on the starting color and choose with the Color button a dark blue color
.
Click on the final color and select a light blue in the same column as the dark
blue .
Click on the blue arrow , above Preview, to return
to the previous window.
For the second part of the gradient we will
build a gradient from green to red across
yellow .
Click on the “ADD” button to add the second
part
of the gradient .
Click
on the starting color and choose
with the Color button a bright
green color .
Click
on the final color and select a red
in the same line as the green (the yellow
must
be on this line ).
Click apply.
The
gradient is ready.
Click on the Description tab to change the name of the
gradient.
To apply this gradient
to the NDVI layer of the Map window, click the Map tab to return.
Double-
click the gradient of the NDVI layer to display the window symbology
. Pull down the gradient options and
select
the gradient custom that you
just
created.
The
final result displays.
