OpenDroneMap-WebODM/slate/source/includes/reference/_task.md

Task

Example task:

{
  "id": 134,
  "project": 27,
  "processing_node": 10,
  "images_count": 48,
  "available_assets": [
      "all",
      "geotiff",
      "texturedmodel",
      "las",
      "csv",
      "ply"
  ],
  "uuid": "4338d684-91b4-49a2-b907-8ba171894393",
  "name": "Task Name",
  "processing_time": 2197417,
  "auto_processing_node": false,
  "status": 40,
  "last_error": null,
  "options": [
    {
      "name": "use-opensfm-pointcloud",
      "value": true
    }
  ],
  "ground_control_points": null,
  "created_at": "2017-02-18T18:01:55.402551Z",
  "pending_action": null
}

A Task is the basic processing unit of WebODM. To compute an orthophoto, point cloud and textured model from a set of images, you need to create a Task.

Field	Type	Description
id	int	Unique identifier
project	int	Project ID the task belongs to
processing_node	int	The ID of the Processing Node this task has been assigned to, or null if no Processing Node has been assigned.
images_count	int	Number of images
available_assets	string[]	List of assets available for download
uuid	string	Unique identifier assigned by a Processing Node once processing has started.
name	string	User defined name for the task
processing_time	int	Milliseconds that have elapsed since the start of processing, or -1 if no information is available. Useful for displaying a time status report to the user.
auto_processing_node	boolean	Whether WebODM should automatically assign the next available Processing Node to process this Task. A user can set this to false to manually choose a Processing Node.
status	int	One of Status Codes, or null if no status is available.
last_error	string	The last error message reported by a Processing Node in case of processing failure.
options	JSON[]	JSON-encoded list of name/value pairs, where each pair represents a command line option to be passed to a Processing Node.
ground_control_points	string	Currently unused. See #37
created_at	string	Creation date and time
pending_action	int	One of Pending Actions, or null if no pending action is set.

Tasks inherit the permission settings from the Project they belong to.

Create a task

POST /api/projects/{project_id}/tasks/

Parameter	Required	Default	Description
images[]	*	""	List of multipart-encoded images (2 minimum)
processing_node		null	The ID of the Processing Node this Task should be assigned to. If not specified, and auto_processing_node is true, a Processing Node will be automatically assigned.
name		""	User defined name for the task
auto_processing_node		true	Whether WebODM should automatically assign the next available Processing Node to process this Task.
options		"[]"	JSON-encoded list of name/value pairs, where each pair represents a command line option to be passed to a Processing Node.

You assign a Task to a Project by passing the proper project_id path in the URL.

Update a task

PATCH /api/projects/{project_id}/tasks/{task_id}/

Parameters are the same as above.

Delete a task

DELETE /api/projects/{project_id}/tasks/{task_id}/

Upon deletion, all images and assets associated with the Task are deleted also. The operation is irreversible.

Get list of tasks

Task list:

[
    {
        "id": 6,
        "project": 2,
        "processing_node": 2,
        "images_count": 89,
        "uuid": "2e8b687d-c269-4e2f-91b3-5a2cd51b5321",
        "name": "Test name",
        "processing_time": 8402184,
        "auto_processing_node": true,
        "status": 40,
        "last_error": null,
        "options": [],
        "ground_control_points": null,
        "created_at": "2016-12-08T13:32:28.139474Z",
        "pending_action": null
    }
]

GET /api/projects/{project_id}/tasks/

Retrieves all Task items associated with project_id.

Download assets

GET /api/projects/{project_id}/tasks/{task_id}/download/{asset}/

After a task has been successfully processed, the user can download several assets from this URL. Not all assets are always available. For example if GPS information is missing from the input images, the geotiff asset will be missing. You can check the available_assets property of a Task to see which assets are available for download.

Asset	Description
all	Archive (.zip) containing all assets, including an orthophoto, TMS tiles, a textured 3D model and point cloud in various formats.
geotiff	GeoTIFF orthophoto.
texturedmodel	Archive (.zip) containing the textured 3D model
las	Point cloud in .LAS format.
ply	Point cloud in .PLY format.
csv	Point cloud in .CSV format.

Download assets (raw path)

GET /api/projects/{project_id}/tasks/{task_id}/assets/{path}/

After a task has been successfully processed, its assets are stored in a directory on the file system. This API call allows direct access to the files in that directory (by default: WebODM/app/media/project/{project_id}/task/{task_id}/assets). This can be useful to those applications that want to stream a Potree dataset, or render a textured 3D model on the fly.

These paths could change in future versions of WebODM. If the asset you need can be reached via /api/projects/{project_id}/tasks/download/{asset}/, use that instead.

Retrieve console output

Console output example:

curl -H "Authorization: JWT <your_token>" http://localhost:8000/api/projects/2/tasks/1/output/?line=5

[DEBUG]   /var/www/data/e453747f-5fd4-4654-9622-b02727b29fc5/images\n[DEBUG]   Loaded DJI_0219.JPG | camera: dji fc300s ...

GET /api/projects/{project_id}/tasks/{task_id}/output/

As a Task is being processed, processing nodes will return an output string that can be used for debugging and informative purposes. Output is only available after processing has started.

Parameter	Required	Default	Description
line		0	Only display the output starting from a certain line number. This can be useful to display output in realtime to the user by keeping track of the number of lines that have been displayed to the user so far and thus avoiding to download all output at every request.

Cancel task

POST /api/projects/{project_id}/tasks/{task_id}/cancel/

Stop processing a Task. Canceled tasks can be restarted.

Remove task

POST /api/projects/{project_id}/tasks/{task_id}/remove/

All assets associated with it will be destroyed also. If the Task is currently being processed, processing will stop.

Restart task

POST /api/projects/{project_id}/tasks/{task_id}/restart/

If a Task has been canceled or has failed processing, or has completed but the user decided to change processing options, it can be restarted. If the Processing Node assigned to the Task has not changed, processing will happen more quickly compared to creating a new Task, since the Processing Node remembers the uuid of the Task and will attempt to reuse previous results from the computation pipeline.

Orthophoto TMS layer

GET /api/projects/{project_id}/tasks/{task_id}/tiles.json

GET /api/projects/{project_id}/tasks/{task_id}/tiles/{Z}/{X}/{Y}.png

After a task has been successfully processed, a TMS layer is made available for inclusion in programs such as Leaflet or Cesium.

If you use Leaflet, you'll need to pass the authentication token via querystring: /api/projects/{project_id}/tasks/{task_id}/tiles/{Z}/{X}/{Y}.png?jwt=your_token

Pending Actions

In some circumstances, a Task can have a pending action that requires some amount of time to be performed.

Pending Action	Code	Description
CANCEL	1	Task is being canceled
REMOVE	2	Task is being removed
RESTART	3	Task is being restarted

Status Codes

Status	Code	Description
QUEUED	10	Task's files have been uploaded to a Processing Node and are waiting to be processed.
RUNNING	20	Task is currently being processed.
FAILED	30	Task has failed for some reason (not enough images, out of memory, Piero forgot to close a parenthesis, etc.)
COMPLETED	40	Task has completed. Assets are be ready to be downloaded.
CANCELED	50	Task was manually canceled by the user.