Depth shades not correct in some areas, this one just above Bonneville Dam on the Columbia River shows the contour to be 21-26 feet yet will not change the chart color to 13 feet in this area. I have put a boundary on it to try to hide bad information on the chart but would be nice if it was corrected.
I’m afraid I can’t find any depths around 21-26 feet in the chart. From what I can tell, all of the white area is 30-60 feet deep and the light blue area is 0-30 feet so the colors look right to me. What am I missing?
On the chart it has a 21’ reading and a 26’ reading, not sure where the 0’ readings are but working in the area over the years I’ve been over in some of that blue without issues before so was just wanted to see where my 13’ contour was. NOTE; in the Evergreen Pacific Publishing River Cruising Atlas shows a 20 to 26 depth contour where R/P shade is blue. Also showing that all the way to shore.
Ah…I see the 21’ and 26’ soundings in the shallow area. However, those have nothing to do with the shading.
The vector chart data includes several types of depth information including spot soundings like those as well as “depth areas” and “contours”. All navigable water is covered by a depth area that describes the range of depths within the area. In this case there are two depth areas, the bluish one goes from 0 to 30 ft and the white one goes from 30 to 60 ft. (The depth contours are essentially just the lines between the depth areas.)
Coastal Explorer, Rose Point ECS, and any other system that renders an ENC will only shade entire depth areas using the closest ones to the depth values you select. These systems will not calculate an arbitrary contour based on your depth values, and in fact cannot do that with the information available in the ENC.
Your Atlas must either be using proprietary data or older NOAA data that NOAA has decided should be removed from the current ENC.
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I see, thanks for clarifying the information for me , yeah the river atlas was the last series of paper raster charts I had for that area. LOL happy new years and thanks for the quick response 