Flyspray#2162 Requests the addition to the Chart Downloader Plugin of Buoys and Overlay Catalogs from the USACE.
In addition to the "IENC U37 Product Catalog" (IENCU37ProductsCatalog.xml) that is maintained in XML format by the USACE (US Army Corps of Engineers), and that is used by the chartdldr_pi (chart_sources.xml), USACE maintains two other XML chart catalogs: "US ACE Inland ENC
Buoy Overlay" (IENCBuoyProductsCatalog.xml) and "US ACE Inland ENC
SW Pass Overlay" (IENCSWPassProductsCatalog.xml). The URL locations for the three catalogs are noted in this USACE web page:
The river charts (IENC U37) produced by USACE are missing most of the buoys that are maintained by the US Coast Guard. That maintenance
includes repositioning buoys as required by seasonal changes in water
depths. USACE updates the ENC Buoy Overlay to show the positions of buoys that are reported by the Coast Guard, and the IENCBuoyProductsCatalog.xml is updated by USACE to show the date of the latest update. This catalog should be added to the chart downloader to make it easier for OpenCPN users to obtain the river charts with the latest buoy positions. Also, using the USACE maintained catalogs is better than having OpenCPN Devs update a custom catalog.
The "US ACE Inland ENC SW Pass Overlay" is an overlay of water
depths for the Southwest Pass of the Mississippi
River from a short distance south of the entrance jetties to just upriver from Venise LA. The USACE surveys the river depths, and this overlay chart probably has newer soundings than those on the NOAA ENC. When the overlay is updated, the date in the catalog is udated by USACE. Again, it is better to have USACE update the catalog than a Dev.
I revised my copies of chart_sources.xml and chartcatalog.cpp to add IENCBuoyProductsCatalog.xml and IENCSWPassProductsCatalog.xml to the chartdldr_pi. Patch files are attached to Flyspray#2162.