October 2024 – Learn Photogrammetry and remote-sensing

The Book titled “Photogrammetric Computations” has been Released

A new book is released and is available in Google books. Soon, It will be also available in Amazon Kindle books. You can buy it from here. The book titled…

Ehsan Khoramshahi October 16, 2024

Probability and Statistics

Uncertainty Statement for Estimated Parameters

An essential aspect of Bundle Block Adjustment (BBA) involves quantifying the uncertainty associated with estimated parameters. In this context, we apply fundamental statistical concepts and probability theory to transfer errors…

Ehsan Khoramshahi October 15, 2024

Advanced Photogrammetry

BBA by-Products

After the BBA is done successfully, the optimal positions and orientations of the images and the geometry of the cameras (in a global coordinate system) are provided with the desired…

Ehsan Khoramshahi October 15, 2024

Advanced Photogrammetry

Bundle Block Adjustment

Bundle Block Adjustment (BBA) is the problem of estimating unknown elements associated with a network of images that are connected to each other with tie points. The initial geometrical structure…

Ehsan Khoramshahi October 15, 2024

Basic Photogrammetry Basics Photogrammetry

Space Resection by Non-Linear Least-Squares

Up until now, we investigated two methods to address space resection (DLT, and the Empirical Method). Here, we state the last method that is useful when we have good estimation…

Ehsan Khoramshahi October 14, 2024

Basic Photogrammetry Basics Photogrammetry

Space Resection with Direct Linear Transform (DLT)

(11 parameter approach) As we saw in the previous section, there are several different ways to address space resection. Perhaps the most practical method is to use the equations of…

Ehsan Khoramshahi October 6, 2024

Basic Photogrammetry Basics Photogrammetry

Space Resection with an Empirical Method without Knowing Initial Values

Spatial Resection is the problem to find the position and orientation of an image or a set of images in the case that there is an acceptable number of model…

Ehsan Khoramshahi October 5, 2024

Basic Photogrammetry Basics Photogrammetry

Space Intersection

One important application of collinearity equations is in the spatial intersection problem, were we estimate approximate intersection of two 3D lines to find model or ground points for a group…

Ehsan Khoramshahi October 5, 2024

Basic Photogrammetry Basics

Absolute orientation

The absolute orientation is to connect two 3D coordinate systems, e.g., a 3D model to a ground coordinate system. The 3D model is usually created from the relative orientation. For…

Ehsan Khoramshahi October 5, 2024

Basic Photogrammetry Basics Photogrammetry

Estimating Essential matrix using homogeneous linear equation method

We may rewrite coplanarity equations by using the following symbols In this case, this equation in a simplified form is This equation can be written in the following vector form…

Ehsan Khoramshahi October 3, 2024