A photogrammetry project typically needs an external scale. With photogrammetric measurement and modeling, the scale is not known until specified. For example, the photogrammetry program does not know if you are inputing photos of a small toy car, or of a full size car. The two cases where one does not define a scale are: […]
Another short and useful tip this week. This tip shows the different ways to select one or more points in the PhotoModeler interface. Point selection is a key operation for many tasks such as getting measurements, referencing, moving, deleting, and triangulating points, etc. Often you need to select groups of points and this tip video […]
We have a short video tip for you this week (less than a minute!). This tip video points out a small feature that would normally be hard to find. That is, the use of the CTRL key to modify how view rotation works in PhotoModeler’s 3D Viewer. The video first reviews the standard ways of […]
PhotoModeler is highly accurate and powerful tool for creating 3D data and measurements from photographic data. There may be circumstances where you want to expand its capabilities to better fit the work you do. The ability to control PhotoModeler, feed it data and extract data from it with an external programming language, provides just this […]
We have a short and sweet tip video for you this week. If you use Tables a lot in PhotoModeler (tables are the spread-sheet-like data view), you may find this tip useful. By default, PhotoModeler opens a new table view tiled with other tables. You can manually tab these views, or move the views around. […]
In many photogrammetry projects you will use external knowledge to refine or add to the project. This external knowledge can be scale measurements, control points, survey data, CAD files, coordinate system definitions, point clouds, etc. Three common forms of external information are: a known distance between two points to define an accurate scale, points selected […]
A number of improvements were made to the meshing capabilities in PhotoModeler Scanner version 2013.0.1 (April 22, 2013). Meshing is a key component in Scanner when working with point clouds created by DSM or by importing (such as from a laser scanner). The meshing steps have been redesigned to streamline the process of creating a […]
PhotoModeler’s automatic camera matching is great for reducing errors and improving project start-up time when you work with more than one camera in your photogrammetry project. This tip video shows the various ways that camera matching works (with one or more cameras in a single project). Automated camera matching is done on photographs from most […]
Without any external input, photogrammetry projects don’t know which way is ‘up’. For example, if you’ve modeled a hard-cover book with photogrammetry, it doesn’t know if the book is lying on a table where the cover would be considered ‘up’, or if it’s on a bookshelf where the cover is facing to the side. This […]
In many measurement tasks one needs to understand how well the positions of 3D points are known; or how confident one can be in their computed positions. Mathematically this confidence is defined by the point’s precision (or standard deviation). An estimate of photogrammetric precision is computed by PhotoModeler’s bundle adjustment algorithm when it solves […]