DavidGrant-NIWC
commented
1 month ago Based on this, we propose that those data producers not willing to see their S-102 datasets automatically loaded in ECDIS (e.g. only at mariners' request) leave the displayScale attribute values Empty. This action would leave the S-102 dataset without the minimum necessary information to allow the loading/unloading/rendering algorithm (refer to C-7) handle its display based on MSVS only. Its loading will require mariners' action.
In the absence of explicit attribution, a mapping could be provided from the approximateGridResolution to a min/max/opt display scale.
kusala9
alvarosanuy
Use case for consideration
In Australia, S-102 datasets will be created to be the 'S-100 equivalent' to our S-57 HDbENC. There will not be an' S-101 version' of our S-57 HDbENC.
Accordingly, and to retain consistent operational functionalities in a DF environment, the AHO would like to see that, Official S-102 navigational products ('notForNavigation=False') that have their minDS and maxDS populated (refer to Note: below) are:
Automatically Loaded/Unloaded/Rendered in harmony with S-101. This means using Display Scales as triggers (refer to C-7).
S-102 WLA over S-101 is activated by default (not at mariner's request) when the dataset is loaded in accordance with the encoded Display scales and the MSVS. We understand that the creation of the safety contour from the bathymetric grid data (S-102) based on the value set by the user is to be automatically triggered once an official, for navigation, S-102 datasets is loaded by the ECDIS.
The AHO is of the opinion that, the adjustment of S-102 depth values by S-104 should continue to be triggered 'at mariner's request' only.
Note: It is important to highlight that S-102 PS 3.0.0 does not have any of the DataCoverage Display Scale attributes set as mandatory (although it is strongly encouraged that Product Specifications mandate the use of one or more of the displayScale provided as part of S100_DataCoverage). Based on this, we propose that those data producers not willing to see their S-102 datasets automatically loaded in ECDIS (e.g. only at mariners' request) leave the displayScale attribute values Empty. This action would leave the S-102 dataset without the minimum necessary information to allow the loading/unloading/rendering algorithm (refer to C-7) handle its display based on MSVS only. Its loading will require mariners' action.
The topic is initially raised with the S-98 PT as we see the concept as an inter-product harmonization issue. (impacts C-4 & C-7). Having said this, we understand the topic will need discussions at the S-102PT level as well, mainly because they would need to update their DCEG to explain the practical implication of populating displayScales, or not. Additionally, we plan to raise the topic for discussion at the upcoming ENCWG meeting.
As always, data producers are responsible for ensuring their S-xx portfolio is complementary and is designed in a way the information provided by each S-100 layer enriches instead of conflicting/confusing mariners' navigational experience.