SUMMER ORTHOPHOTO 2012 (SOP2012)
Questions and Answers to the tender material. The questions are anonymized. Almost equal questions are aggregated.
Q: Can you tell me whether the VisionMap A3 sensor system is allowed this year?
A: Appendix A.3 says: “Camera: The production is to be completed with a 4-channel (RGBNir), full size frame camera with a resolution higher than 100 megapixel. “
The version of the VisionMap A3 sensor that we know of do not fulfil these requirements. In general there can camera updates, which we not are aware of.
Q: What is the size of the project area in square miles?
A: The tender is divided into two Sub-agreements/Contracts. The Western part of Denmark is 36208 km2 and the Eastern part is 18712 km2. (2,6 km2 = 1 square mile)
Q: Can we get a list of interested bidders for this project?
A: Sorry, the list is not public.
Q: In the Tender Material section 5.1 there is a reference to an environmental protection declaration in appendix A.8. Should this reference be A.9 in stead?
A: Yes, please look in appendix A.9 to find the environmental protection declaration. Q:
Will the evaluation of the sub-agreements happen independently?
A:
Yes, there will be a separately evaluation.
For each offer and for each sub-agreement we evaluate the selection criteria. This includes the capacity of cameras and planes which is offered. If the offer meets the requirements in the selection criteria, the assignment criteria are assessed. For each sub-agreement the company with the highest score will be assigned the contract.
If the same company has the best score on both sub-agreements, it will be validated if the total capacity of cameras and planes which is offered is sufficient for both sub-agreements. If not, the selection criteria are not meet and the company will not be assigned to both contracts. Besides capacity as selection criteria, it will be evaluated if assignment criteria differ.
Q:
Is it allowed to give a common/composite offer for both sub-agreements?
A:
Yes, it is. As long as differences concerning capacity, price, logistic, time and quality assurance clearly is described separately, common files for the rest of the offer can be delivered.
Q: Appendix A.2, page 2, first bullet says: ”Projects must be finalized over maximum 7 calendar days”. Does this mean that a project should be completed in max. 7 consecutive calendar days?
A: Yes, all exposures in a photo project must be fulfilled in maximum 7 consecutive calendar days. This is to help getting a more homogeneous view.
Q: Appendix A3 p.2 says: ”horizontal accuracy: better than 2 pixels absolute (32 cm)”. Is the accuracy expressed here as Root Mean Square Error?
A: No, it means the absolute accuracy. Is it realistic in both theory and praxis to achieve an absolute accuracy of 1-2 pixels? Q: The basic service is described to be in 4-channel-RGBNir, but Appendix A3 page 2 about colour resolution says: ”24 bit RGB colour, 16,7 million colours”. Could you please clear this out?
A: The basic service must be in 4-channel-RGBNir, so please change the phrase in Appendix A3 to “32 bit RGBNir”.
Q: Is there a form available for filling out the different prices?
A: Please look in Tender Material section 5.3 where the five prices for each sub-agreement are described. This can be considered as the form we want to receive the prices.
Q: What years should we state in turnover statement?
A: We must have to the latest audited version from 2011 or 2010 - preferably both.
Q: Is the orthophoto resolution (pixel size) same as the GSD of aerial images (16cm)?
A: Yes, both must be 16 cm.
Q: What should be delivered as the result of aerotriangulation?
A: We would like to receive the following documentation per AT: • AT report (if MatchAT, one with blunder detection and one without) • Plot showing residuals and distribution of GCPs in the AT-block • Plots showing 3, 4, 5, 6 fold tiepoints • Plot showing image connection • Documentation of connection to neighbouring/overlapping ATs • A summary report per AT-project that address all relevant statistical parameters, all “unusual matters”. Q: Guidelines for Best Practice and Quality Checking of Ortho Imagery mentions product RSME specification (page 15) and that value is basis for defining the framework of a adjustment. What is the required accuracy for this project, that is product RSME specification?
A: The geometrical accuracy of the final product is specified to 32 cm absolute (corresponding to 2 pixels), i.e. that no disparities between the ortho mosaic and the terrain should exceed 32 cm. In Guidelines for Best Practice this is expressed differently as an RMSE in the absolute block accuracy.
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