GeoPackage As Output

GeoPackage WMS Output Format

Any WMS GetMap request can be returned in the form of a Geopackage by specifying format=geopackage as output format (see WMS output formats). The returned result will be a GeoPackage file with a single tile layer.

The following additional parameters can be passed on using format_options:
  • tileset_name: name to be used for tileset in geopackage file (default is name of layer(s)).
  • min_zoom, max_zoom, min_column, max_column, min_row, max_row: set the minimum and maximum zoom level, column, and rows
  • gridset: name of gridset to use (otherwise default for CRS is used)

GeoPackage WMS Output Format

Any WFS GetFeature request can be returned as a Geopackage by specifying format=geopackage” as output format (see WFS output formats). The returned result will be a GeoPackage file with a single features layer.

GeoPackage WPS Process

A custom GeoPackage can be created with any number of tiles and features layers using the GeoPackage WPS Process (see WPS Processes).

The WPS process takes in one parameter: contents which is an xml schema that represents the desired output.

General outline of a contents scheme:

<geopackage name=”mygeopackage” xmlns="http://www.opengis.net/gpkg">

<features name=”myfeaturelayer” identifier=”L01”>
        <description>describe the layer</description>
        <srs> EPSG:4216 </srs>
        <bbox>
                <minx>-180</minx>
                <miny>-90</miny>
                <maxx>180</maxx>
                <maxy>90</maxy>
        </bbox>
    ...
</features>

<tiles name=”mytileslayer” identifier=”L02”>
        <description>describe the layer</description>
        <srs>..</srs>
        <bbox>..</bbox>
        ...
</tiles>

</geopackage>

Each geopackage has a mandatory name, which will be the name of the file (with the extension .gpkg added). Each layer (features or tiles) has the following properties:

  • name (mandatory): the name of the layer in the geopackage;
  • identifier (optional): an identifier for the layer;
  • description (optional): a description for the layer;
  • srs ( mandatory for tiles, optional for features): coordinate reference system; for features the default is the SRS of the feature type;
  • bbox ( mandatory for tiles, optional for features): the bounding box; for features the default is the bounding box of the feature type.

Outline of the features layer:

<features name=”myfeaturelayer” identifier=”L01”>
        <description>..</description>
        <srs>..</srs>
        <bbox>..</bbox>
        <featuretype>myfeaturetype</featuretype>
        <propertynames>property1, property2</propertynames>
        <filter>..</filter>
</features>
Each features layer has the following properties:
  • featuretype (mandatory): the feature type
  • propertynames (optional): list of comma-separated names of properties in feauture type to be included (default is all properties)
  • filter (optional): any OGC filter that will be applied on features before output

Outline of the tiles layer:

<tiles name=”mytileslayer” identifier=”L02”>
        <description>...</description>
        <srs>..</srs>
        <bbox>..</bbox>
        <layers>layer1, layer2</styles>
        <styles> style1, style2 </styles>
        <sld> path/to/file.sld </sld>
        <sldBody> .. </sldBody>
        <format>mime/type</format>
        <bgcolor>ffffff</bgcolor>
        <transparent>true</transparent>
        <coverage>
                <minZoom>5</minZoom>
                <maxZoom>50</maxZoom>
                <minColumn>6</minColumn>
                <maxColumn>60</maxColumn>
                <minRow>7</minRow>
                <maxRow>70</maxRow>
        <coverage>
        <gridset>
                ...
        </gridset>
</tiles>
Each tiles layer has the following properties:

  • layers (mandatory): comma-separated list of layers that will be included

  • styles, sld, and sldbody are mutually exclusive, having one is mandatory
    • styles: list of comma-separated styles to be used
    • sld: path to sld style file
    • sldbody: inline sld style file

  • format (optional): mime-type of image format of tiles (image/png or image/jpeg)

  • bgcolor (optional): background colour as a six-digit hexadecimal RGB value

  • transparent (optional): transparency (true or false)

  • coverage (optional)

  • minzoom, maxzoom, minColumn, maxColumn, minRow, maxRow (all optional): set the minimum and maximum zoom level, column, and rows

  • gridset (optional): see following

Gridset can take on two possible (mutually exclusive) forms:

<gridset>
        <name>mygridset</name>
</gridset>

where the name of a known gridset is specified; or a custom gridset may be defined as follows:

<gridset>
        <grids>
                <grid>
                <zoomlevel>1</zoomlevel>
                <tileWidth>256</tileWidth>
                <tileHeight>256</tileHeight>
                <matrixWidth>4</matrixWidth>
                <matrixHeight>4</matrixHeight>
                <pixelXSize>0.17</pixelXSize>
                <pixelYSize>0.17</pizelYSize>
                </grid>
                <grid>...</grid>
                ...
</grids>
</gridset>