Creating a project using Optical Satellite Modeling

Optical Satellite Modeling includes the the following options:

Toutin's Model
Rational Function (Extract from image)
Rational Function (Compute from GCPs)
Low Resolution

Toutin's Model is a rigorous model that compensates for known distortions to calculate the position and orientation of the sensor at the time of image acquisition. It is suitable for use with any optical satellite data, regardless of resolution, such as CARTOSAT, LANDSAT, or SPOT.

Rational Function (Extract from image) and Rational Function (Compute from GCPs) are each a simple math model that builds a correlation between the pixels and the ground locations. When you want to import the coefficients from a file, select Rational Function (Extract from image). Some data providers compute the rational functions coefficients based on their knowledge of the sensor and distribute the coefficients and the image. When the rational functions coefficients are calculated based on the GCPs that you collect, select Rational Function (Compute from GCPs).

For more information about the rational functions math models, see Understanding the rational functions math model.

Tip: You determine the source of the polynomial coefficients in the Project Information window when you create your project. Under Options, you can calculate the polynomial coefficients from ground control points (GCP) by selecting Rational Function (Compute from GCPs). Later, when you collect GCPs in the GCP Collection window, you can select the number of coefficients that you want to use from an available No. of Coefficients list.

Low Resolution is for use with advanced very-high-resolution radiometer (AVHRR) data.

For more information about the Optical Satellite Modeling math model, see Understanding Optical Satellite Modeling.

To create a project using Optical Satellite Modeling

On the File menu, click New.
In the Project Information window, type a file name for your project in the Filename box.
This will be the file name of your project after you click OK.
In the Name box, type a name for the project.
The name you enter will appear on the title bar of the OrthoEngine window
In the Description box, type a brief description of the project.
A good description helps you—and most importantly, others—to identify the subject and contents of the project.
Under Math Modeling Method, click Optical Satellite Modeling.
With IKONOS images, see Using the right math model with IKONOS data.
Under Options, click the model type that corresponds to the images that you are using in your project:
- Toutin's Model
- Rational Function (Extract from image)
- Rational Function (Compute from GCPs)
- Low Resolution