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Community maps

How create and upload data patch from your raster data.

We are asserting community geospartical data and patches for boatpilot in ERSI Shapefiles format. Eeach deep describing feature should have decimal deep attribute.

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  • QGIS

    1. Download QGIS application

    QGIS is free and opensource software available for most operation systems. You can download it from its offical site: qgis.org

    QGIS is a user friendly Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android.

  • Coastline

    2. Download world coastline shapefile.

    The world coastline shape will be required for presise georeferencing. It distributed freely and can be downloaded from OpenStreetMap Coastlines. WGS84 version is required.

    OpenStreetMapData.com provides geodata based on information from OpenStreetMap, processed for easier use for rendering maps and other purposes.

  • Project

    3. Create QGIS project and add coastline shape layer.

    Start QGis and add ERSI Shapefile layer with downloaded coastline shape. Then using raster->georeferencing tool add raster layer to project. You can find more information about georeferencing tool here:
    Tutorial: Georeferencing Topo Sheets and Scanned Maps
    QGIS Tutorial 02 : Georeferencing using QGIS

  • Layer

    4. Create vector layer with your data.

    Add new shapefile layer for your data. Select Line as type, WGS84 as CRS and add new attribute named deep of decimal type.

    Save it under deep-counter name.
    You can another types for point deeps or deep areas using Point or Polygon as layer type

  • Draw

    5. Draw deeps data (Line)

    Switch shapefile layer to edit mode. Add deep lien using Add feature tool point by point over raster layer. When feature created add Id and deep as properties. Ids should be unique for your file. You can use ascending number sequence as ids.

  • Upload

    6. Add more data and upload shapefiles using form bellow

    Repeat previous for all your shape files and save layer when you are ready. Create zip archive with 4 files: deep-counter.cpg, deep-counter.dbf, deep-counter.shp, deep-counter.shx Upload this archive to our server. Our content managers will review and apply your changes to our geospatial database.