For every survey in Propeller, a Processing Report is produced. It includes information on the image quality and ground control accuracy in the model of your site. Here, we’ll go over what a Processing Report is and what information you can get from it.
What is the Processing Report?
The Processing Report is an analysis of the photos and how well they aligned and how well the model fits with the ground control points uploaded with the survey.
Where is the Processing Report?
The Processing Report for your selected dataset can be found by clicking on Reports in the top menu bar and then clicking on Processing Report. This will open a new tab in your browser.
A link to the Processing Report is also included in the email you receive after a dataset has finished processing.
What is in the Processing Report?
At the top of the report, there is a box with a brief summary of details about the dataset, including the capture date, name of the person who uploaded the dataset, the coordinate reference system, the filter used, the AeroPoint survey used (if applicable), the geotag accuracy, and the total number of source photos.
You can print out a PDF version of the Processing Report by clicking on the Save button at the top of the report.
In the Overview section, you will see the orthophoto of your survey with the ground control points (GCPs) marked over a base map. These will appear by default.
If you click on the icon for a GCP, a pop-up will appear on the map with information on that control point, including the XYZ location. The same information appears below the map, except for the location.
To view information about the individual source photos, check the box underneath the map labeled Photos.
The individual photos and ground control points will appear as icons (as seen below). The legend below the map screen describes each icon.
If you chose to apply a filter to the dataset, you can see which areas of the site were affected by the filter and to what degree. The colored areas show where objects were filtered out.
The Image Quality section shows a bar chart of the image quality, with the image quality plotted against the number of images.
The tables below the graph provide more detail on the image alignment and error.
Expected Ground Control Accuracy
This table shows the expected ground control accuracy before the data is processed.
You can check the box below the table to view the unused control points.
Ground Control Summary
This summary provides the location of each ground control point and checkpoint used to create the model of your site. You can view any unused points by checking the box below the table.
The table also provides the difference in elevation between the final model and the submitted control point.
How can I use the Processing Report?
The information in the Processing Report can be used in a variety of ways, including better understanding your model’s accuracy, learning how to improve future surveys, and validating areas between GCPs using checkpoints. For a more detailed explanation, contact your customer success representative.
I still can't do it!
We wrote these articles to arm you with everything you need to get the job done on your own, but we understand that sometimes this isn't sufficient.
If you're stuck, the Propeller data success team may be able to help. You can contact our support team by clicking the support tab on the top-right pane of your user portal.