As part of our dedication to reducing complexity in the earth observation space, Content Store delivers a standard product regardless of the underlying sensor. This ensures that your process can expect a consistent product every Order.
Naming Scheme
All SkyWatch products follow a standardized naming scheme. Here is an example:
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SKYWATCH_PHR_PS_20180727T0219_ALL_Tile_1_1_c9d9
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SKYWATCH - All products start with "SKYWATCH", so they can be identified from any other products you might be using.
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Satellite Code - This product has "PHR" as the satellite code, indicating that it is a Pleiades product. Here is a table of the most common satellite codes:
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Code | Satellite |
PHR | Pleiades |
PNEO | Pleiades-Neo |
SS | SkySat |
USKY01 | UrbanSky |
Processing - The letters "PS" on this image indicate that it has been pansharpened. Currently, pansharpened is the only option for display. NewSat will show the letters "MS", which stands for multispectral.
Timestamp - The next set of numbers and letters indicate the time at which the image was collected, in this case on 2018-07-27 at 02:19 UTC.
Tile Numbers - This image is Tile 1,1 of the full image. In cases where the imagery is too large to be manageable (~>50km2), the imagery is tiled before delivery. These tiles are numbered from top left, with the first number indicating the row, and the second indicating the column.
ID - This is an 8-character random ID generated for each output.
Projection
All outputs are provided in EPSG 4326 projection (WGS84 Geographic). This is the default coordinate system for most GIS and other software, and is readily compatible with many basemaps and open data products. Wikipedia Article about WGS84.
Files
There are two main formats that image files are delivered with through Content Store - GeoTIFF and PNG. In both cases, if the image would be more than 10,000 pixels in any dimension (e.g. a 5km-wide 50cm image), the results are tiled seamlessly and are delivered together.
GeoTIFF
Georeferenced Tagged Image File Format (GeoTIFF) is an open file format and de facto standard based on the TIFF format and is used as an interchange format for georeferenced raster imagery. GeoTIFF is widely by remote-sensing data experts and scientists.
SkyWatch always delivers a non-BIGTIFF, UInt16, uncompressed GeoTIFF.
For a more complete overview of the GeoTIFF format, we recommend this well-documented article from GeoSpatial World .
For example, the following code reads you the size of the 16-band images:
PNG Files
The visual output for any Order is provided as a rendered PNG file. In cases of RGB, RGB+NIR, or All Optical Bands, this image is made up of the Red, Green, and Blue bands of the image, and is thus always a True Colour image.