Elevation data for final project error 400

[taylor-obrien]

I am trying to download the elevation data from Appears for the final project, my code looks like this.

However, I keep getting this error, what am I doing wrong here?

[NobodyLivesHere]

There is something it doesn't like in how it's submitting the request to the MODIS server that's making it throw a 400 error. It might be that it isn't seeing the geometry right for the study site or something funky for the date.

[taylor-obrien]

Thanks! I'm hoping someone knows where I'm going wrong or how to correct this issue.

[pth6570]

I’m not sure if either will fix the issue but a couple of things you might want to try:

1 - I have my layer name as “SRTMGL1_DEM” instead of “SRTMGL1_DEM Elevation”.

2 - If you look at the AppEEARS API Documentation (https://appeears.earthdatacloud.nasa.gov/api/#task-object), it looks like it might want specific date formats based on whether you’re using a recurring or non-recurring date range. Since you have recurring set to False, perhaps try changing the start and end dates to MM-DD-YYYY, and dropping year_range?

[eggvoice]

@taylor-obrien
I got it working with layer SRTMGL1_NUM instead of SRTMGL1_DEM.

You can list the layer with this snippet of Python code:

import requests
import json

product_id = 'SRTMGL1_NUMNC.003'
response = requests.get('https://appeears.earthdatacloud.nasa.gov/api/product/{0}'.format(product_id))
layer_response = response.json()
print(json.dumps(layer_response))

Response (Layer Info):

{
    "SRTMGL1_NUM":
    {
        "AddOffset": "",
        "Available": true,
        "DataType": "int16",
        "Description": "Quality Assurance",
        "Dimensions":
        [
            "time",
            "lat",
            "lon"
        ],
        "FillValue": 0,
        "FillValueRaw": "0",
        "Group": "",
        "IsQA": true,
        "Layer": "SRTMGL1_NUM",
        "OrigDataType": "int16",
        "OrigValidMax": 255,
        "OrigValidMin": 0,
        "QualityLayers": "",
        "QualityProductAndVersion": "",
        "ScaleFactor": "",
        "Units": "",
        "ValidMax": 255,
        "ValidMin": 0,
        "XSize": 3601,
        "YSize": 3601
    }
}

My sample download code:

elev_downloader = etapp.AppeearsDownloader(
    ea_dir=srtm_dir,
    product='SRTMGL1_NC.003',
    layer='SRTMGL1_DEM',
    start_date="02-11-2000",
    end_date="02-21-2000",
    polygon=filtered_gpd
)

elev_downloader.download_files()

[eculler]

Hey @eggvoice @taylor-obrien the NUM layer is the quality assurance, not the DEM! But, the second sample download code here does look right. I ran into the same problem last week, and it was the layer name for me too.

[eggvoice]

Thank you! I just figure that out too!!
I was mixing up my product ids and layer ids as I was trying to figure out which combos would work.

product_id = 'SRTMGL1_NC.003'
layer_id = 'SRTMGL1_DEM'

srtm_downloader = etapp.AppeearsDownloader(
    ea_dir=data_dir,
    download_key=download_key, # srtm-pawnee
    product=product_id,
    layer=layer_id,
    start_date='02-11-2000',
    end_date='02-21-2000',
    polygon=pawnee_gdf
)
if not os.path.exists(os.path.join(data_dir, download_key)):
    srtm_downloader.download_files(cache=True)

[nbol48]

I am running into the same error from my code. Is it possible that this download won't work in a function? I tried it outside of the function as well and couldn't get rid of the error so it seems unlikely but hopefully some more eyes will see something I'm missing!

'''
def srtm_download(desired_file_name, gdf):
"""
Parameters
==========
file_name : str
Desired file name for the DataArray when it is saved in the earthpy downloads directory
gdf : GeoDatafram
The dataframe conatining a single geometry for the APPEEARS downloader to indentify

Returns
=======
DataArray of the elevations raster data for the selected national grassland geometry
"""
# download_key = desired_file_name
srtm_downloader = eaap.AppeearsDownloader(
    download_key=desired_file_name,
    product='SRTMGL1_NC.003',
    layer='STRMGL1_DEM',
    start_date='02-11-2000',
    end_date='02-21-2000',
    polygon=gdf
)
srtm_downloader.download_files()

srtm_filepaths = glob(os.path.join(srtm_downloader.data_dir,
                                   'SRTMGL1_NC.003*',
                                   '*.tif'
                                   ))
return [rxr.open_rasterio(srtm_filepaths, masked=True).squeeze() for srtm_filepaths in srtm_filepaths][0]

'''

[nbol48]

This is the message I get from the link the error provides: {"message": "You don't have the permission to access the requested resource. It is either read-protected or not readable by the server."}

[nbol48]

......and I got it. STRM vs SRTM.