It might contain a space or some character that ArcGIS or GeoRAS does not recognize, such as middle dashes, accents, “ñ”, etc. At last, the most common cause of this error is related to the path where the project is located in ArcGIS with all its elements/layers.The reference coordinate system it is not the same for all the elements/layers we used to create the HEC-RAS model, for example, the reference system of the Digital Elevation Model is ETRS_89_29N and the rest of the layers have the projection set to ETRS_89_30N.Some of the elements/layers with which we created the HEC-RAS model, were not well georeferenced (does not have a correct coordinate reference system).The following error may be encounter: “Failed to create intermediate ESRI XML file! Object reference not set to an instance of an Object.” The most common error that can appear when you try to export your HEC-RAS results (.sdf archive) using the Export RAS data tool to an xml file. In this exercise we will find out about the most frequent error which we can encounter while working with HEC-RAS and ArcGIS (via HEC-GeoRAS). While importing HEC-RAS data to ArcGIS (using GeoRAS), the appearance of errors is a common thing, the complex architecture of the software and the specific detailed input necessities, make the handling of this software seem difficult. The interface capabilities include operations like preparation, import and export data from HEC-RAS into ArcGIS, as well as processing of the exported HEC-RAS data. HEC-GeoRAS is a tool, that allows processing geospatial data in ArcGIS using a graphical user interface (GUI). Using ESRI products, Carto, Mapbox and Google Maps. It’s up to you what way will you pick up in order to place your drawing in the correct geographical location in QGIS. dwg file in QGIS was never so simple then. The biggest advantage of this way is retaining all layer features (colours, thickness, etc) customized yet in AutoCad or similar. Nevertheless, following this mechanism you should achieve this goal. It will be obviously harder, when you have no previous job displayed in QGIS, or when you used the WGS 84 or Pseudo-Mercator coordinates to start with. You can follow the instructions for SAGA’s Transform Vector Layer tool above. Remember to rescale your shape, when it doesn’t fit your map scale. The process has been explained in detail in the video below. This way you can set a new location for your vector layer. If you need to drag your map canvas, you better use the keyboard up/right/down/left arrows to do it. The shape is glued to our cursor despite zooming in/out or moving the map unless we click somewhere. 14 Moving our drawing in QGIS The new location of our shape is glued to the cursor. Namely, we must set the scale factor (change it from default 1.0) and define X and Y coordinates (Pic. 4), where I described all inputs in the Transform Vector Layer tool, there are others to fill in this time. If you have in mind the screenshot above (Pic. I am standing by SAGA’s transform vector layer. In this event, we should use one of the three georeferencing vector layer tools mentioned above. Most of the time the rescaling process is needed. 7) there is an easy way to gauge the difference of the scale at the area affected by our drawing. Once you imported successfully your drawing to QGIS and next place it on the map canvas, like I did above (Pic. Assuming, that you were focused on drawing and omitted any cartographic issues in AutoCad or similar software, it will be needed for you now. Basically, we don’t know at the initial stage how our drawing will correspond with the map since we haven’t dealt with setting proper scale before. 7 Our former AutoCAD drawing can be seen in QGIS at the proper location.Īnother matter indispensable to the georeferencing of our object is rescaling.
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