Geojson city boundary does not work

[xiaofanliang]

Dear ohsome team,

I tried to replicate the codes in the Jupyter notebook with some other cities' geojson files but failed to succeed. Are there any specific requirements for the data in geojson format?

I tried two ways to download these cities' boundary geojson files:

1. through overpass directly https://overpass-turbo.eu/ by replacing the city name and download geojson. I did not modify the downloaded geojson file. An example of such file is attached in the zip.

2. through osmdata package in R. I downloaded the file through the following line and then use st_write to export as geojson. I also attached an example in the zip.

library(osmdata)
library(sf)
boundary = getbb('Algiers, Algeria', featuretype = "city", format_out = "sf_polygon")$multipolygon
st_write(boundary, 'path/Algeria_osmdata.geojson')

These generated geojson files are valid as I can map them, but when passed into the request, creates an error saying 422 Client Error: Unprocessable Entity for url: https://api.quality.ohsome.org/v1/indicators/mapping-saturation.

If there is another programming way to download cities' boundary geojson files for ohsome API, I would appreciate an example because the approaches above cannot generate the geojson files acceptable to ohsome API.

Thank you very much.

Algiers.zip

[matthiasschaub]

Hello @xiaofanliang, -- Thanks for opening of this issue and the throughout description. Your GeoJSON are totally fine indeed. The fault lies with the API. The validation of a possible CRS field of the GeoJSON is done wrongly and that is causing the error. Until we release a fix, a workaround is to remove the CRS field in the GeoJSON like this:

{"type":"FeatureCollection","name":"Algiers_from_overpass","features":[{"type":"Feature","properties":{"id":"relation/2711524","X.id":"relation/2711524","admin_level":"6","boat":null,"boundary":"administrative","long_name.ar":"دائرة شراقة","long_name.fr":"Daïra Cheraga","long_name.kab":null,"name":"Cheraga","name.ar":"دائرة شراقة","name.ber":"ⵝⴰⴷⴰⵢⵔⴰ ⵏ ⵛⴻⵔⵔⴰⴳⴰ","name.en":"Cheraga District","name.fa":null,"name.fr":"Daïra Cheraga","name.kab":"Tadayṛa n Craga","name.ur":null,"type":"boundary","waterway":null,"X.relations":null,"wikidata":"Q3019689","wikipedia":"en:Chéraga 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[matthiasschaub]

You might also be interested in the ohsome dashboard where it is possible to do quality analysis (e.g. Mapping Saturation) for administrative boundaries through an easy interface: https://dashboard.ohsome.org/#backend=oqtApi

[xiaofanliang]

@matthiasschaub Thanks for the quick response. I understand that removing the CRS field is a temporary solution. I need to run the quality check for a list of cities, so I cannot modify them one by one.

Is there a programming way to remove the CRS field? The closest I can do is to use the sfc_geojson() function in geojsonsf package to strip the boundary geometry off all properties https://cran.r-project.org/web/packages/geojsonsf/readme/README.html:

library(osmdata)
library(geojsonsf)

bb = getbb('Algiers, Algeria', featuretype = "city", format_out = "sf_polygon") 
bb = bb$multipolygon
bb = sfc_geojson(st_as_sfc(bb))
write(bb, paste0('PATH', filename, '.geojson'))

However, the exported file (I attached an example, Algiers.geojson) has structure issues that do not comply with the requirement. Any idea?

Algiers.geojson.zip