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Found 5 results

  1. Hi, I have a LIDAR DEM file (in ACSII Grid format loaded as a GIS object) that I am using to pull elevation for my mesh and cross sections. The vertical projection is NAVD88 US Survey Feet. However, every time I reopen my SMS file the units reset to meters. Chaning the project from local to NAVD88 and saving the SMS file does not help. Does anyone know a way to get the vertical project to be saved in GIS data? Thanks, Phillip
  2. Omar Eldaghar

    Where can I find best DEM data?

    Hi all, Why there's a difference in elevations between DEM data from USGS using WMS and google earth? I used DEM data from here: https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ Is there a better accurate more updated source? Thanks,
  3. Omar Eldaghar

    Where can I find best DEM data?

    Hi all, Why there's a difference in elevations between DEM data from USGS using WMS and google earth? I used DEM data from here: https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ Is there a better accurate more updated source? Thanks,
  4. Hi, I am trying to set up a groundwater model. I have DEM data that covers a large area (these are less accurate). In addition, I have more accurate measured ground surface elevation data (in X, Y and Z form) at several locations of interest given the discharge and pumping activities at these locations. There are observed ground water elevations at these locations which are expected to be used in model calibration. I first used DEM data to establish ground elevation in the entire model domain and then imported the observed data at these locations of interest and interpolated in 2D. Problem is that ground surface elevations in entire modeling area changes when I load observed local data as 2D data set and interpolated. Since there are no observed data in the regions among observed data, ground elevation drastically changes to unrealistic values in the areas where there is no observation data. Simply, model remove elevations calculated from DEM and recalculate elevations based only using observed data. Please let me know how I can first use DEM data to generate ground surface elevations in my entire model and revise ground elevations only locally using measured data without changing ground elevations in the entire domain. Thank you, Lalith
  5. I'm trying to compute flow directions and accumulations by TOPAZ but if I'm trying to run it the warning shows up that I have to convert DEM to UTM before running TOPAZ. I do not know where the problem could be. I'm using metric units and plane coordinate system as the area which I'm going to model is very small and the terrain was measured in the field. Could you please help me to solve this problem?
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