GMS, SMS, and WMS User Forum  Members

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1. The problem is the TIN resolution Solution for this problem is to make the WMS to use a finer resolution for calculating the storage: These are the results for one of the segments number after I increased the TIN resolution. This table have widths for first 11 layers. The 3000*1500 is the resolution in my new TIN and 300*150 is the one that I and the WMS team used. You can see about 20% difference between the values is almost equal as the amount I was concerned about. 3000*1500 300*150 difference 1863.5 1506.2 19% 1800.0 1461.8 19% 1727.2 1425.8 17% 1650.8 1395.9 15% 1566.9 1385.8 12% 1496.1 1190.1 20% 1423.9 1166.2 18% 1366.0 1151.6 16% 1322.9 1071.9 19% 1280.5 1049.6 18% 1242.0 1028.5 17% What I did is: 1- to convert the TIN to a DEM ( here you can define an interpolation ratio). I adjusted the new DEM resolution to 3000*1500 (it was 300*150). 2- Convert back the new DEM to TIN. And from this TIN I used the rest of the work. The calculation time will increase significantly but the results are more convincing.
2. Hello Chris Thank you for the reply. The TIN is made from x y z points in (Longitude , Latitude, Elevation in meters) e.g. (-106.5 , 51.6, 555) At first I used the (Geographic (Latitude/ Longitude)) projection but the distance calculated between two points were not correct. So I reproject the maps to UTM. Projection : UTM Zone: 13(108w-102w)Northern hemisphere Datum: NAD83 Planar Units: METERS I checked the distance between two points that I know the distance in reality (51 4' 45"/106 37' 10" and 51 6' 17"/106 39' 0.5") . The distance should be around 3500 meters which is correct in UTM projection . (In the Geographic projection it was 0.0394 m). So I have everything in meters and when I am using the ruler I have correct values for distance. The segment Length is also correct but the layer width is not. I also checked the calculated storage capacity which is not correct and consequently the layer width. Amir
3. Hi I have some concerns about bathymetry widths calculation. The bathymetry widths calculated by WMS are up to 50% less than the real measurements. The projection seems to be correct and when I use the ruler I get correct values. The TIN resolution is fine and good. Now I am suspicions of the following issues: 1- The storage calculation from TIN is not correct and consequently the layers widths. 2- The TIN map resolution is not fine enough. 3- The projection is not correct or the ruler tool is not correct or the ruler shows the values in a different projection system (i.e The ruler shows the length at meters while the widths are calculated in a different unit).
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