VANCOUVER, British Columbia - PhotoSat, provider of the world's only engineering quality satellite surveying service, has announced the publication of 21 new satellite surveying accuracy studies on their website. The studies include data from seven different stereo satellite systems, with the best results showing elevation surveying accuracies of better than 15cm.
The accuracy studies include stereo satellite data from the following satellites:
- ALOS PRISM
"PhotoSat has delivered over 700 satellite surveying projects since 2007 and we have carried out accuracy evaluations on the majority of them," said Gerry Mitchell, President of PhotoSat. "While we aren't able to publish most of the actual survey data as it is proprietary to our clients, they have provided feedback on the majority of the projects. We are therefore able to confirm the results of the 21 new accuracy studies as consistent with both client feedback and our own project accuracy evaluations."
The accuracy studies were conducted over two test areas: one located west of Asmara, Eritrea where PhotoSat has access to more than 45,000 ground survey points over a 50km by 20km block, and the second in SE California where PhotoSat uses a very accurate Opentopography.org open source LiDAR survey.
The studies employed different numbers of ground survey control points for each test area and each satellite system, and it was discovered that increasing the number of ground survey points did not necessarily correlate with higher accuracy. For example, the accuracy of the WorldView-3 survey for the California test area was not improved by additional ground survey points. This WorldView-3 survey is accurate to 13cm in elevation with one ground survey control point and with 153 ground survey control points.
In contrast, some satellite stereo pairs did have accuracy significantly improved by increasing the number of ground survey control points. The WorldView-2 survey for Eritrea was accurate to 19cm in elevation with two ground control survey points, and accurate to 14cm in elevation with 21 ground control points.
PhotoSat has been continuously producing accuracy studies since 2007 in order to provide objective, quantifiable accuracy data for stereo satellite surveying and mapping. The Company has previously published nine of these studies.
PhotoSat has invented a new technology that generates the world's most accurate satellite surveying. This engineering quality data shortens timelines and eliminates surveying delays in all phases of resource and engineering projects. We have delivered over 700 highly accurate surveying projects, and have published a number of accuracy studies which are available on our website. For more information, visit www.photosat.ca.