Welcome to the RAS Solution Forums HEC-RAS Help Terrain layer not aligned with other layers

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  • #7006
    BrynTawton
    Participant

    Hi all,

    I’m trying to build a model, and have imported Lidar data processed in QGIS, but my terrain data (obtained from a QGIS Merged Raster layer) does not line up with my other data (Geometry, Google Satellite, Raster layers, OS Maps).
    It seems to be roughly 107m and -56m out in the Northing and Eastings, respectively, as indicated by other posters I have seen previously. I have altered the Northing and Easting values in all files being utilised by my .prj folder, but the layers are still misaligned.

    If they cannot be easily aligned, would it be easy to work with just the terrain layer to establish a flood model?

    #11625
    LorenAmelang
    Participant

    I just noticed your report. Sounds a bit like mine:
    http://hec-ras-help.1091112.n5.nabble.com/Terrain-from-EPSG-3310-file-is-475-south-of-Web-Imagery-tp6257.html

    The terrain I had pre-processed and re-projected in QGIS was displaced. RAS Mapper (from 5.0.5) was able to import the original DEM directly – in the correct location.

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