# PLMosaic (Planet Labs Mosaics API)

Driver short name

PLMosaic

Build dependencies

libcurl

This driver can connect to Planet Labs Mosaics API. GDAL/OGR must be built with Curl support in order for the PLMosaic driver to be compiled.

The driver supports listing mosaics and reading them. Mosaics are accessed at their highest resolution. Mosaics are typically composed of quads of 4096x4096 pixels.

For mosaics of type Byte, overviews are available by using the tile API. For other data types, there is no support for overviews, so requests that involve downsampling may take a long time to complete.

## Driver capabilities

Supports Georeferencing

This driver supports georeferencing

## Dataset name syntax

The minimal syntax to open a datasource is :

    PLMosaic:[options]

Additional optional parameters can be specified after the ‘:’ sign. Currently the following one is supported :

- api_key=value: To specify the Planet API key. It is mandatory, unless it is supplied through the open option API_KEY, or the configuration option PL_API_KEY.

- mosaic=mosaic_name: To specify the mosaic name.

- cache_path=path: To specify the path to a directory where cached quads (and tiles) are stored. A plmosaic_cache/{mosaic_name} subdirectory will be created under that path. The empty string can be used to disable any disk caching.

- trust_cache=YES/NO: Whether already cached quads should be reused directly, without prior checking if the server has a more recent version. Note: this only applies to quads, and not tiles. Default is NO.

- use_tiles=YES/NO: Whether to use the tile API to access full resolution data, instead of downloading quads. Only apply for Byte mosaics. Default is NO.

If several parameters are specified, they must be separated by a comma.

If no mosaic parameter is supplied, the list of available mosaics will be returned as subdatasets. If only one mosaic is available, it will be directly opened.

## Open options

The following open options are available : API_KEY, MOSAIC, CACHE_PATH, TRUST_CACHE and USE_TILES. They have the same semantics as the above describe parameters of same name.

## Configuration options

The following configuration options are available :

- PL_API_KEY=value: To specify the Planet API key.

## Location information

The special Pixel_{x}_{y} metadata item of the LocationInfo metadata domain, where x is the column and y is the line in the mosaic, can be queried to get information about the scenes that compose the underneath quad. This is the syntax used by the gdallocationinfo utility (see RFC 32: gdallocationinfo utility)

Below an example of the return :

    <LocationInfo>
      <Scenes>
        <Scene>
          <link>https://api.planet.com/data/v1/item-types/PSScene3Band/items/20161025_000336_0e19</link>
        </Scene>
        <Scene>
          <link>https://api.planet.com/data/v1/item-types/PSScene3Band/items/20161119_000453_0e14</link>
        </Scene>
        <Scene>
          <link>https://api.planet.com/data/v1/item-types/PSScene3Band/items/20161010_000309_0e26</link>
        </Scene>
        <Scene>
          <link>https://api.planet.com/data/v1/item-types/PSScene3Band/items/20161119_000452_0e14</link>
        </Scene>
      </Scenes>
    </LocationInfo>

### Examples

Listing all mosaics available (with the rights of the account) :

    gdalinfo "PLMosaic:" -oo API_KEY=some_value

or

    gdalinfo "PLMosaic:api_key=some_value"

or

    gdalinfo "PLMosaic:" --config PL_API_KEY some_value

returns (in case of multiple mosaics):

    Driver: PLMOSAIC/Planet Labs Mosaics API
    Files: none associated
    Size is 512, 512
    Coordinate System is `'
    Image Structure Metadata:
      INTERLEAVE=PIXEL
    Subdatasets:
      SUBDATASET_1_NAME=PLMOSAIC:mosaic=global_quarterly_2017q1_mosaic
      SUBDATASET_1_DESC=Mosaic global_quarterly_2017q1_mosaic
      ...
    Corner Coordinates:
    Upper Left  (    0.0,    0.0)
    Lower Left  (    0.0,  512.0)
    Upper Right (  512.0,    0.0)
    Lower Right (  512.0,  512.0)
    Center      (  256.0,  256.0)

Open a particular mosaic :

    gdalinfo "PLMosaic:mosaic=global_quarterly_2017q1_mosaic" -oo API_KEY=some_value

returns:

    Driver: PLMOSAIC/Planet Labs Mosaics API
    Files: none associated
    Size is 8388608, 4427776
    Coordinate System is:
    PROJCS["WGS 84 / Pseudo-Mercator",
        GEOGCS["WGS 84",
            DATUM["WGS_1984",
                SPHEROID["WGS 84",6378137,298.257223563,
                    AUTHORITY["EPSG","7030"]],
                AUTHORITY["EPSG","6326"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4326"]],
        PROJECTION["Mercator_1SP"],
        PARAMETER["central_meridian",0],
        PARAMETER["scale_factor",1],
        PARAMETER["false_easting",0],
        PARAMETER["false_northing",0],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["X",EAST],
        AXIS["Y",NORTH],
        EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"],
        AUTHORITY["EPSG","3857"]]
    Origin = (-20037508.342789243906736,13384429.400847502052784)
    Pixel Size = (4.777314267823516,-4.777314267823516)
    Metadata:
      FIRST_ACQUIRED=2017-01-01T00:00:00.000Z
      LAST_ACQUIRED=2017-04-01T00:00:00.000Z
      NAME=global_quarterly_2017q1_mosaic
    Image Structure Metadata:
      INTERLEAVE=PIXEL
    Corner Coordinates:
    Upper Left  (-20037508.343,13384429.401) (180d 0' 0.00"W, 76d 0'57.94"N)
    Lower Left  (-20037508.343,-7768448.059) (180d 0' 0.00"W, 57d 2'26.63"S)
    Upper Right (20037508.343,13384429.401) (180d 0' 0.00"E, 76d 0'57.94"N)
    Lower Right (20037508.343,-7768448.059) (180d 0' 0.00"E, 57d 2'26.63"S)
    Center      (       0.000, 2807990.671) (  0d 0' 0.01"E, 24d26'49.74"N)
    Band 1 Block=256x256 Type=Byte, ColorInterp=Red
      Overviews: 4194304x4194304, ..., 256x256
      Mask Flags: PER_DATASET ALPHA
      Overviews of mask band: Overviews: 4194304x4194304, ..., 256x256
    Band 2 Block=256x256 Type=Byte, ColorInterp=Green
      Overviews: 4194304x4194304, ..., 256x256
      Mask Flags: PER_DATASET ALPHA
      Overviews of mask band: Overviews: 4194304x4194304, ..., 256x256
    Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
      Overviews: 4194304x4194304, ..., 256x256
      Mask Flags: PER_DATASET ALPHA
      Overviews of mask band: Overviews: 4194304x4194304, ..., 256x256
    Band 4 Block=256x256 Type=Byte, ColorInterp=Alpha
      Overviews: 4194304x4194304, ..., 256x256

## See Also

- Documentation of Planet Mosaics API

- API Authentication

- Vector PLScenes / Planet Scenes API driver