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Reprojecting a Shapefile in QGIS

Reprojecting a shapefile involves changing its Coordinate Reference System (CRS) to align with the spatial requirements of your project. This is essential when integrating multiple datasets that must share a common projection. In QGIS, this process is straightforward and preserves the original dataset by creating a new reprojected file.

Purpose​

Ensure all layers within a project share a consistent projection to support accurate spatial analysis and compatibility with other geospatial datasets.

Prerequisites​

  • QGIS installed on your machine.
  • A shapefile with an associated .prj file (defines its current CRS).
  • Knowledge of the target EPSG code or CRS.

Steps to Reproject a Shapefile in QGIS​

1. Open Your Shapefile​

  • Launch QGIS.
  • Use the Browser Panel or Layer > Add Layer > Add Vector Layer... to load the shapefile into your project.
  • Alternatively, drag and drop your shapefile into the layers Panel.

  1. Export the Layer with a New Projection

    • Right-click the shapefile layer in the Layers Panel.
    • Select Export > Save Features As...

  2. Configure Output Settings

    • Format: Ensure ESRI Shapefile is selected (or another preferred format).
    • File Name: Click the ... button to define the output location and file name.
    • CRS (Coordinate Reference System):
      • Click the CRS selector.
      • Choose the desired CRS from the list or use the search bar to find an EPSG code.
    • Optionally adjust any additional fields under geometry or layer options.

  3. Save the Reprojected File

    • Click OK.
    • The new shapefile will be saved with the specified CRS and added to your map.
tip
  • Consistent CRS Across Datasets: Only one projection can be used per project in TytonAI. Ensure all uploaded imagery and vector data share the same CRS.
  • Include All Shapefile Components: When adding clipped geometry to TytonAI, ensure the .shp, .shx, .dbf, and .prj files are compliled in a .zip for upload..
  • Avoid On-the-Fly Confusion: QGIS can display layers with different CRS using "on-the-fly" transformation, but for analysis or uploading, always reproject and save layers with the correct CRS.