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Download Item Data

LesiMai3

Hi,

I was trying to use the item's download method to download the data associated with a map image layer on Portal. But it doesn't seem to be able to download the data and I got b' ' as the output. I also tried the get_data method, which returns an error message saying "the JSON object must be str, not 'bytes'".

I did a similar workflow on a hosted feature layer on ArcGIS Online. And this time, it was able to download the item. But it only returns the data schema in a dictionary. Is there way to download the actual data behind a hosted feature service? Can the download method work with map image layers?

Or did I miss something here?

Thank you!

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asterxiang

I have a hosted feature service in AGOL which contains multiple hosted feature layers and tables. I'd like to programmatically create backup for these data. In AGOL the layer export is configured enabled, so under each feature layer I can manually export each layer (or table) to another folder in AGOL, which is the desired output. For example:

Pavement Ramp Entrance

Open In Export To Service URL

Pavement Ramp Exit

Open In Export To Service URL

What I like to to do is to do this export programmatic for each layer and table. However, I could not find the same function in Python API. The "export" function I tried gives an error of:

'FeatureLayer' object has no attribute 'export'

Looks like the "export" function only works on an item, so I tried on the item (the entire feature service), the export result did not produce the expected result.

Is this export function not available for feature layer? If so, any other way I can create back up of these data? (I have also tried the extract_data mentioned in the first reply, however the data is editable, so not all layers have data currently and the extract_data failed). Thanks!

PhilLarkin1

Alistair Fox

You could query the service for the JSON. This doesn't consume credits. The method works best if your feature count is below the return limit of the service.

from arcgis.gis import GIS
from arcgis.features import FeatureLayer
import arcpy
gis = GIS("http://yourROOT.maps.arcgis.com/","User","Pw")

layer = FeatureLayer("https://services1.arcgis.com/oz19jk1209j09j39j/ArcGIS/rest/services/ServiceName/FeatureServer/0",gis)

featureSet = layer.query(where='1=1', out_fields='*')

rawJSON = featureSet.to_json

jsonFile = 'c:\\somelocalpath\example.json'

localFC = 'c:\\somelocalpath\\Example.gdb\\data'
with open(jsonFile, "w") as file:
    file.write(rawJSON)

arcpy.JSONToFeatures_conversion(jsonFile,localFc

ahkim

I checked our AGOL credit after reading this and it did, in fact, use credit! Glad you mentioned it otherwise I would have continued to test. Thank you!

AlistairFox2

we have been able to download file geodatabase, but some do fail .At the moment we have a support call in with ESRI. we seem to think it is related to our Survey123 created and published feature classes only.

We have also note that extract_data call also consumes credits ,where as manual export data does not. Anyone know if there is an equivalent that does not consume credits

ahkim

rsingh-esristaff‌ I am also getting the "Item does not exist or is inaccessible" error when I try to download as file geodataabse. Is this a bug?

AlistairFox2

yes that was it. all sorted now that i am actually on the 1.0 release

apart from the fact the export_data seems to ignore the output_name attribute? anyone got that to work?

outputgdb = extract_data([csv_lyr],output_name="fred")

layer exported is still the default one esri use when you supply nothing

I've tracked through the code and the ExtractData task is definitely getting passed the output name. When i switch to CSV it seems to use the service name (more usable) so I think it seems to be some hard coding inside the extract data task in online that for zipped file gdb outputs it forces to a set name structure. Can anyone confirm?

Anonymous User

Alistair Fox‌ Can you check if you have upgraded to version 1.0 of the API? The `features` module is new in v1.0 and not found in v0.3 or earlier.

To check, open your terminal (or Python command prompt if you installed using Pro) and type

conda list

and check the version next to `arcgis` package.

AlistairFox2

any idea whey when i use

from arcgis.features.manage_data import extract_data

I get No module name 'arcgis.features'

LesiMai3

Hi Rohit,

I have a follow-up question. After I downloaded the data using extract_data, I noticed that file item was added to AGOL. Is that the intended result?

Thank you,

Lesi

LesiMai3

Hi Rohit,

You're right! Changing to a data format other than file geodatabase works. Not sure why though...

Thank you for your help!

Lesi

SupratimBanik

Hi Lesi,

I'm not sure why extracting data to a file geodatabase isn't working and the error message isn't very informative.

Please try specifying a different data_format such as Shapefile:

res = extract_data([lyr], data_format='Shapefile')

res.download('C:\\Test')

Thanks,

Rohit

LesiMai3

Hi Rohit,

Thank you for the detailed clarification!

I tried the your sample code on a hosted feature layer but got the following error message --

How can I fix it?

Thank you,

Lesi

SupratimBanik

Hello,

You can download the data for file based item types. File based items include CSV, Service Definition, Shapefile, File Geodatabase, Powerpoint, etc.

Hosted feature layers and map image layers are not file based items, so you cannot use the item.download() method to download their data.

For hosted feature layers, you can use one of the following ways to get the data:

1) Use extract_data tool from the features.manage_data module (doc: arcgis.features.manage_data module — arcgis 1.0 documentation). It's easy to use, couple examples:

from arcgis.features.manage_data import extract_data
csv_lyr = gis.content.get('c8bc7d3c3b60415e9845bc00dcd777ed')

outputgdb = extract_data([csv_lyr])

outputgdb.download('C:\\xc')

Out[]: 'C:\\xc\\extract_data_20161025204926.zip'

# you can also specify the format:
outputcsv = extract_data([csv_lyr], data_format='CSV')

2) You can get the related data item for the layer, and download the data item used to publish the layer:

relitems = layer_item.related_items("Service2Data")

relitems[0].download()

Hope this helps,

Rohit

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