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Hello,


i’m trying to get dates of available landsat 8/9 images (level 2-atmospherically corrected).


I have used this function:


def get_dates(time_interval,bbox,collection):

    

    catalog = SentinelHubCatalog(config=config)

    

    tiles = list(catalog.search(

        collection=collection,

        time=time_interval,

        bbox=bbox

    ))    

    

    

    dates = =parse_time(t('properties']''datetime']) for t in tiles]

    

    return dates



lan8_dates=get_dates(time_interval,bbox,DataCollection.LANDSAT_OT_L2)

But I get this message:



DownloadFailedException: Failed to download from:
https://services…

with HTTPError:

404 Client Error: Not Found for url: …

Server response: “{“code”:404,“description”:“Collection not found.”}”



I’m not sure what cause this error. I can see that this function works when I use sentinel 2 but not landsat, but I don’t know what is the reason.


My end goal is to get the dates availability of Landsat 8/9

Hi,

The error suggests that the data you are searching for is not found in the endpoint url specified . Note that Landsat data are stored in US-west region of aws.

Therefore you need to use https://services-uswest2.sentinel-hub.com as endpoint url https://docs.sentinel-hub.com/api/latest/data/landsat-8/#catalog-api-capabilities

you can easily specify that in the config object as such:

config.sh_base_url='https://services-uswest2.sentinel-hub.com'

Best regards

Hi, thanks for the quick answer! what do you mean to specify that in the config object?
When I set up credentials for use I use:

config = SHConfig()

and inside the function I use, I’m not sure if that should come instead of the catatlog item

 catalog = SentinelHubCatalog(config=config)

#need to ce changged to this in case of landsat?

config.sh_base_url='services-uswest2.sentinel-hub.com'

When I do this I got error:

def get_dates2(time_interval,bbox,collection):
    #I changes the url based on erro I recieved with the one you suggested)
    config.sh_base_url='http://services-uswest2.sentinel-hub.com/api/v1/catalog/search?'
    catalog = SentinelHubCatalog(config=config)

    tiles = list(catalog.search(
        collection=collection,
        time=time_interval,
        bbox=bbox
    ))    


    dates = =parse_time(t('properties']''datetime']) for t in tiles]

    return dates

MissingSchema: Invalid URL ‘services-uswest2.sentinel-hub.com/api/v1/catalog/search’: No schema supplied. Perhaps you meant http://services-uswest2.sentinel-hub.com/api/v1/catalog/search?

I’m a little but confused why this needed.

Best regards 🙂

 

config = SHConfig()

Just right here as you set the credentials

config = SHConfig()

config.sh_base_url='https://services-uswest2.sentinel-hub.com'

and then go on to run the rest of your function



def get_dates(time_interval,bbox,collection):

    catalog = SentinelHubCatalog(config=config)

    tiles = list(catalog.search(
        collection=collection,
        time=time_interval,
        bbox=bbox
    ))    


    dates =  parse_time(tt'properties']]'datetime']) for t in tiles]

    return dates

lan8_dates=get_dates(time_interval,bbox,DataCollection.LANDSAT_OT_L2)

Thank you. that worked, but now I understand that the challenge is different;

I want to use this function in order to get dates of sentinel 2 and landsat 8 (each time changing the datacollection.

I’m thinking to add the config as parameter like this:


def get_dates(time_interval,bbox,collection):

    

    if collection==DataCollection.SENTINEL2_L2A:

        



        catalog = SentinelHubCatalog(config=config)



        tiles = list(catalog.search(

            collection=collection,

            time=time_interval,

            bbox=bbox

        ))    

    

    

        dates = =parse_time(t('properties']''datetime']) for t in tiles]

        

    elif collection==DataCollection.LANDSAT_OT_L2:

        config = SHConfig()

        config.sh_base_url='https://services-uswest2.sentinel-hub.com' 

        

        tiles = list(catalog.search(

            collection=collection,

            time=time_interval,

            bbox=bbox

        ))            

        

        

    

    return dates

but is giving this error



UnboundLocalError: local variable ‘catalog’ referenced before assignment


Based on the error message,

the catalog and config variables, need to be declared atleast for each of the if statements.


if collection==DataCollection.SENTINEL2_L2A:

     

        config = SHConfig()

        config.sh_base_url='https://services.sentinel-hub.com' 

        catalog = SentinelHubCatalog(config=config)



elif collection==DataCollection.LANDSAT_OT_L2:

        config = SHConfig()

        config.sh_base_url='https://services-uswest2.sentinel-hub.com' 

        catalog = SentinelHubCatalog(config=config)

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