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Hello, I am experiencing a problem with unit conversion, which occurs sometimes when I bring rasters into GMS as GIS layers, and sometimes when I interpolate the rasters to a 2D grid. All of my inputs are in meters. All of my inputs have the same projection, with a coordinate system that uses meters. All of my grids and grid frames are in meters. My project document units are set as meters. Everything is in meters. Everything is supposed to be in meters. And yet, when I bring in some .tif files, all of the values in the GIS layer are multiplied by 3.28, and under Properties/Min and Max Elevation, the units show up as feet. I don't want anything in feet. I thought it must be a projection issue, so I hunted through my grids, and discovered that the Grid Frame, which I'd built under Map Data, was defaulting to No Projection/Feet. So I fixed that, and saved the project file. And I'm still having exactly the same (very frustrating) issue. Yes, I could just divide my inputs by 3.28, but that's the kind of workaround that makes me seriously reconsider my life choices. Any help? Is this a display issue that doesn't actually affect the way the program reads my data? Is there anywhere else I can look for errant unit designations? Is there a check box somewhere that I need to deselect? Is this a legacy effect from the formerly incorrect units of that one grid frame (which these rasters shouldn't be interacting with anyway)? Should I just burn it down and rebuild? I truly appreciate any help! Update: It looks like the numbers are being re-converted before getting into the HDF5 file, so it appears that the display units are wrong... but inconsistent, and I still can't find a toggle that might be telling the display to change to feet with some files. Also, the numbers aren't quite correct - they are about 20% off. So, I have a test recharge raster, with a constant value of 2.8*10^-5 m/d. It is displaying as 9.2*10^-5... feet?...in the 2D grid, and then the value in the HDF5 file is 2.2*10^-5.
HI all experts, 1. I am kinda new to SMS. My problem is, in the tutorial TUFLOW 2D simulation the data for the boundary conditions (Flow VS time) and (Head VS time) are in cms and meter unit. But when I put the data into SMS bc part it says at top that the units are in cfs and foot. So, I need to convert the original data provided in SMS tutorial in feet and then put in to BC part in SMS? 2. Also, I exported a dem of my study area from arcgis in to sms and converted to 2d scatter. But the values are almost 3 times less than that of in Arcgis. In Arcgis the vertical unit is in State plane US feet projection (for new jersey). I checked the projection in SMS. Its still the same. Also I put the planar and vertical unit in SMS to US feet. Then why I am having this 3 times less value in SMS. 3. Another problem is my dem is very high resolution (10 ft). When I do the 2d scatter conversion my whole SMS crashed and my pc got hanged totally. I can't even move my mouse. I checked one time. And saw that all of my 8gb of ram is used. Now, I am only working with a very very small are by upscaling the DEM. This works actually. But ultimately I need to analyzed the whole area for my research. So, should I need a high performance computer to do this. Please help me. Thanks in advance. --Fahad
Hello, I am trying to create a multi layer model using data from previous studies. One previous study has rasters for the layers I will be using, where the projection gives planar distance in meters and elevations in feet. I went to Edit | Units and made sure they were consistent with the projection. Now, when I make a coverage (Streams, e.g.) and set it up to use the Streams package, the input values (Streambed Conductance, e.g.) are in m^2/d but the data I have is in ft. The original model I am looking at for guidance reported that they were able to use feet. How do I go about changing the units for my coverage inputs? Thank you, Haley