Documentatie/Create-a-cropfield.md

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