Creates an ID that can be used to render a "thumbnail" image.
This is used in conjunction with
thumbnails.getPixels. A call to
thumbnails.create provides an expression and some output options. The result of
thumbnails.create is an ID that represents an image that is the result of evaluating that expression and applying those options. Subsequently, calls to
thumbnails.getPixels can be made to get the image data for the entire resulting image. The ID will be valid for a moderate period (a few hours).
The most common use case for this pair of endpoints is to provide a complex expression via a POST to
thumbnails.create, and then fetch the computed image via a GET to
thumbnails.getPixels. This two-part process allows for use in more situations than
image.computePixels. In particular: - the result of
image.computePixels needs to be unwrapped to get the encoded image bytes. The result of
thumbnails.getPixels can be displayed directly by a browser. -
image.computePixels can only be called by an authorised user, using a properly-scoped OAuth token.
thumbnails.create has the same restriction, but
thumbnails.getPixels can be invoked with a URL containing an API key, so URLs invoking it can be used more broadly.
The result of evaluating the expression has to meet some reasonable requirements for the requested image format. In particular, JPEG or PNG format requires that there be one or three output bands, and clips values that are outside the 0-255 range.
The description "thumbnail" does not imply a restriction on the size of the computed image: the same restrictions as
image.computePixels apply to
thumbnails.getPixels. Requests are limited to 32MB in uncompressed data per request, computed as the product of the request dimensions in pixels, the number of image bands requested, and the number of bytes per pixel for each band. Requests are also limited to at most 10000 pixels in either dimension and at most 1024 bands. Requests exceeding these limits will result in an error code of 400 (BAD_REQUEST).
The URL uses gRPC Transcoding syntax.
Required. The parent of the thumbnail collection (e.g., "projects/*").
Authorization requires the following IAM permission on the specified resource
User supplied tag to track this computation.
The request body contains an instance of
If successful, the response body contains a newly created instance of
Requires one of the following OAuth scopes:
For more information, see the Authentication Overview.