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Hello and welcome to PCI Tech TV my name is Christina.
today we're going to be looking at the adjust Ortho Math Modeling Method
in Ortho Engine. For this demo I will be using two high resolution airphotos
of Richmond Hill Ontario. These airphotos have been corrected
using only an SRTM Digital Elevation Model
as a result the orthos are not aligned with each other
The adjust ortho math Modeling method will correct the overlap areas of only one
of the orthos.
When this correction is made, both orthos will
overlap each other. Areas outside the overlap area
will remain unchanged. The adjust ortho math modeling method requires a Geomatica Core license.
This is assuming you will collect CGPs manually.
If you wish to collect GCPs automatically you will need Geomatica Core
and the ortho engine production toolkit. To begin the ajust ortho
project, we first need to open Geomatica OrthoEngine.
OrthoEngine can be found on the Geomatica Toolbar. Once our OrthoEngine
window opens up, we need to select File, New.
Now we need to enter the project information
we need to enter file name: for the project so we just browse to the
location where this will be saved
you can enter project name and description as well
under math modeling method select Adjust Ortho
click OK to continue. The Set Projection window opens
in order to get the projection information you can open your image
in focus and navigate to the files tab
Right click on your image, Select Properties. Navigate to Projection
and copy and paste this information and to the Ortho Engine Window
Enter a pixel spacing
ours is point six. Click on the set GCP projection based
on output projection and click OK
Now's a good time to save your project
The next step in our project is input our
images under Processing Step select
GCP collection. Click on
open a new or existing image
new image and navigate to the two images
we're going to use in this project Select os188tordem
and os189tordem and click open.
The next step in our project is to collect TCP's now that our images have
imported we can close this window. In the Geomatica toolbar
we can select collect GCPs manually, or collect GCPs automatically
for this project we will be collecting GCP's automatically
When the automatic GCP collection window opens
we want to select the georeferenced image. We will be selecting
os189tordem. We also want to select the DEM file.
For this, I will be using DEM WORLD.
We will only be collecting GCP for
os188tordem so we want to uncheck
0s189todem. Change the number of GCPs per image
to 200 and click on match GCPs.
Once the GCPs have been collected
we can click on add GCPs to project. Now we can collect GCP's for the
second image.
click on match GCPs after you have un-checked os188todem.
Once the GCPs have been collected click on
add GCPs to project. We can now close this panel.
To view the result
of our automatic GCP collection, we can click on
display project overview in the Ortho Engine panel.
This will show us all of our GCPs collected.
we need to select GCPs on the left,
as well as footprints, and all images. This is all of the GCPs collected
over both images. We can now close this panel.
The next step in our project is to define
a binding polygon boundary. This is extremely important with adjust ortho as
any areas outside the polygon will not be modified. The polygon drawn should include
all of the GCPs collected for the image. To do this
we need to change our processing step to geometric correction,
and select define bounding polygon.
Two separate windows open
the open image window and the define bounding polygon window
click on the os188tordem image in
open image window. We want zoom to overview.
If you know the exact X and Y values
for the polygon you wish to draw, you can enter these in the define bounding
polygon window.
If not simply move the red bounding polygon
in the image to include all of the CCPs previously collected.
Click on Close.
The next step in our project is to generate an ortho.
We can click on schedule Geometric Correction
From the Geometric Correction processing step. When the geometric correction
image production window opens, we need to move the available images from the left
window to the right. Click on os188tordem
and click on the arrow which will move the image to the images to process window.
We now need to browse to a location where the orthorectified image will be saved.
Select an appropriate folder,
and name for the file. We can now select
a sampling interval of 4, and all other options can be left as default.
We can now click on correct images. Once the ortho has been generated,
we can open it and focus to verify the shift in the image.
Open a generated the generated ortho and os189tordem for comparison
as this is the image we used as our georeferenced source.
Click on View, Visualization tools
and swipe. You can add zoom into your image.
You can see that both images overlay nicely with each other. You have
now completed an adjust project. Thank you for watching PCI Tech TV!