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Create-b-cropfield.md
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Create-b-cropfield.md
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## Creating a cropfield
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This page explains what a cropfield is, and how to create one through the API.
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Agricultural datasets generally refer to a specif crop, at a specific location at a specific time.
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Therefore, we need to create a "Cropfield" item, to define this location and a timeframe our data relates to.
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A cropfield provides a convienient way to group all data for a crop grown on a specific plot during a season.
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Farmmaps also uses the cropfield to collect and prepare context data such as weather, satelite imagery etc.
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To create a cropfield we:
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* Get the parent folder to place the cropfield under
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* Create a folder under this element (optional)
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* Create the cropfield
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**Prerequisites**
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To create a cropfield we need:
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* an acces token
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* coordinates of the cropfield (what points define the plot contour)
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* a startdate and an end date (what timeframe does this data aply to)
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### Get parent element
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First, we'll get the parent code needed to place the cropfield in the hierarchy.
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**Request**
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Replace `<acces token>` with your actual token.
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```http
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GET https://farmmaps.awacc.nl/api/v1/folders/my_drive? HTTP/1.1
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Host: farmmaps.awacc.nl
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Accept: application/json
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Authorization: Bearer <access token>
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```
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**Response**
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The response will be something similar to:
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```http
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HTTP/1.1 200 OK
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Server: nginx/1.14.0 (Ubuntu)
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Date: Tue, 21 Apr 2020 09:57:07 GMT
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Content-Type: application/json; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Cache-Control: no-store,no-cache
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Pragma: no-cache
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Content-Encoding: br
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Vary: Accept-Encoding
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{
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"url":"/api/v1/folders/f25d8765a1cd407cb235961c73c268cf:USER_FILES",
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"code":"f25d8765a1cd407cb235961c73c268cf:USER_FILES",
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"name":"My Drive",
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"created":"2019-09-25T19:39:33.841835",
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"updated":"2019-09-25T19:39:33.841835",
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"itemType":"ROOT_FOLDER",
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"size":0,
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"state":0,
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"thumbnail":false
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}
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```
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So the `parentcode` we need is **"f25d8765a1cd407cb235961c73c268cf:USER_FILES"**
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You can also find the code of a folder by browsing the folders in your FarmMaps account through the web interface.
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The item code is the last part of the URL.
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### Create folder
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Depending on how you want to organise things, you might choose to make a separate folder for the cropfield.
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A folder can be created by creating an item with itemType `FOLDER`.
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> **Note:** At the moment, subfolders can not be created directly under the root folder, create a folder through the web interface first.
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**Request**
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```http
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POST /api/v1/items HTTP/1.1
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Accept: application/json
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Authorization: Bearer <access token>
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Content-Type: application/json
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Cache-Control: no-cache
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Host: farmmaps.awacc.nl
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Accept-Encoding: gzip, deflate, br
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Connection: keep-alive
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Content-Length: 210
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{
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"parentCode": "f25d8765a1cd407cb235961c73c268cf:USER_FILES",
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"itemType": "FOLDER",
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"name": "My_new_folder",
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"data": {},
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"dataDate": "2020-04-24T09:59:18.893Z",
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"geometry": {},
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"tags": [ "string" ]
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}
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```
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When the folder is created successfully we should recieve something like this:
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**Response**
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```http
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{
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"parentCode": "string",
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"geometry": {},
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"data": {},
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"tags": [
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"string"
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],
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"url": "string",
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"code": "string",
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"name": "My_new_folder",
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"created": "2019-12-18T10:16:21.455Z",
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"updated": "2019-12-18T10:16:21.455Z",
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"dataDate": "2019-12-18T10:16:21.455Z",
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"itemType": "string",
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"sourceTask": "string",
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"size": 0,
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"state": 0,
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"thumbnail": true
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}
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```
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### Create the cropfield
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Now we can create the cropfield. We do so by setting `"itemType": "vnd.farmmaps.itemtype.cropfield"` and adding data to the geometry parameter.
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Generally, a cropfield contour would be defined as a polygon, so we add `"type":"Polygon" and all the coordinates.
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We also need to specify a `dataDate` and a `dataEndDate` to indicate the the timeframe of the growing season.
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The `dataDate` needs to be before `dataEndDate` and cannot be on the same day.
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**Request**
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```http
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POST /api/v1/items HTTP/1.1
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Accept: application/json
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Authorization: Bearer <acces token>
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Content-Type: application/json
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Cache-Control: no-cache
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Host: farmmaps.awacc.nl
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Accept-Encoding: gzip, deflate, br
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Connection: keep-alive
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Content-Length: 916
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{
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"parentCode": "6601a06d812b40f9830c9fe4e63b1944",
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"itemType": "vnd.farmmaps.itemtype.cropfield",
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"name": "cropfield for VRA",
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"dataDate": "2019-1-18T10:16:21.455Z",
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"dataEndDate": "2019-12-18T10:16:21.455Z",
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"data": {},
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"geometry": {"type":"Polygon","coordinates":[[[6.09942873984307,53.070025028087],[6.09992507404607,53.0705617890585],[6.10036959220086,53.0710679529031],[6.10065149010421,53.0714062774307],[6.10087493644271,53.0716712354474],[6.10091082982487,53.0716936039203],[6.10165087441291,53.0712041549161],[6.10204994718318,53.0709349338005],[6.10263143118855,53.0705789370018],[6.10311578125011,53.0702657538294],[6.10331686552072,53.0701314102389],[6.103326530575,53.070119463569],[6.10309137950343,53.0699829669055],[6.10184241586523,53.0692902201371],[6.10168497998891,53.0691984306747],[6.10092987659869,53.0694894453514],[6.09942873984307,53.070025028087]]]}
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}
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```
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**Response**
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When the cropfield is created, it should be visible through the FarmMaps web interface (under "My Drive" in the respective parent folder).
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We should have the following response:
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```http
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HTTP/1.1 201 Created
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Server: nginx/1.14.0 (Ubuntu)
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Date: Fri, 24 Apr 2020 08:56:45 GMT
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Content-Type: application/json; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Cache-Control: no-store,no-cache
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Pragma: no-cache
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Content-Encoding: br
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Location: /api/v1/items/8ecbaa2d85d5484db7f16b281b7cd013
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Vary: Accept-Encoding
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{
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"parentCode":"6601a06d812b40f9830c9fe4e63b1944",
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"geometry": {
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"type":"Polygon",
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"coordinates":[[
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[6.09942873984307,53.070025028087],
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[6.09992507404607,53.0705617890585],
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[6.10036959220086,53.0710679529031],
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[6.10065149010421,53.0714062774307],
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[6.10087493644271,53.0716712354474],
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[6.10091082982487,53.0716936039203],
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[6.10165087441291,53.0712041549161],
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[6.10204994718318,53.0709349338005],
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[6.10263143118855,53.0705789370018],
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[6.10311578125011,53.0702657538294],
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[6.10331686552072,53.0701314102389],
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[6.103326530575,53.070119463569],
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[6.10309137950343,53.0699829669055],
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[6.10184241586523,53.0692902201371],
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[6.10168497998891,53.0691984306747],
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[6.10092987659869,53.0694894453514],
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[6.09942873984307,53.070025028087]]
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]},
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"data":{},
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"tags":[],
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"isEditable":false,
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"url":"/api/v1/items/8ecbaa2d85d5484db7f16b281b7cd013",
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"code":"8ecbaa2d85d5484db7f16b281b7cd013",
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"name":"cropfield for VRA",
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"created":"2020-04-24T08:56:45.3727807Z",
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"updated":"2020-04-24T08:56:45.3727807Z",
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"dataDate":"2019-01-18T10:16:21.455Z",
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"itemType":"vnd.farmmaps.itemtype.cropfield",
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"size":0,
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"state":0,
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"thumbnail":false
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}
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```
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**Troubleshooting**
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|Status code|Description|
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|201|Cropfield created successfully|
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|401|Error: not authenticated|
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|403|Error: No write permissions in parent item|
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|404|Error: Parent item not found|
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Now that the cropfield has been created, we can start the processing by running a task.
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This will collext all context data for the cropfield.
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We need the ItemCode of the cropfield to start the task so keep this at hand.
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