Cannot decode geobuf from PostGIS

[Monzyy]

I have a geobuf string from PostGIS that look like this:
CgVjb3VudCLTAwoeChQIAhoQzvjgCNKYhzbmC/4F1jTIIGoCGAtyAgAAChoKEAgCGgyKueEImL+H NvIjlBZqAhgLcgIAAAomChwIAhoY/NzhCKzVhzbSEIQKygfsA5oKggS6C9gDagIYC3ICAAAKHgoU CAIaEOyK4gj26oc2/ArSApAMiAJqAhgLcgIAAAoaChAIAhoM+KHiCNDvhzbsWKIKagIYC3ICAAAK JgocCAIaGOT64gjy+Yc23gnkAd4IyALKB/ICkAfKA2oCGAtyAgAACiIKGAgCGhT6m+MI2oSINvIG ngSgF6QQvgykCmoCGAtyAgAACiAKFggCGhLO+OAI0piHNj7jASGNAZcopzlqAhgLcgIAAAoaChAI AhoM0tDgCLjchjaXDs0TagIYC3ICAAAKGgoQCAIaDLrC4AjqyIY28xHdGWoCGAtyAgAACkEKNwgC GjPGsOAIjK+GNtsC2wZBtQQTwQSWAZMFlgKpBMgJuQ3sAbMD7AGVBhW/A2vtA3+dA68GjRBqAhgL cgIAAAoZCg8IAhoLrrXgCJzkhTZs6wFqAhgLcgIAAAotCiMIAhofmrbgCLDihTaWAqUC/BXVENIZ wwzKBMcBqAMnxAXQAWoCGA1yAgAA

When I decode this I get an error:
Uncaught (in promise) Error: Unimplemented type: 4
at o.skip (index.js:211:20)

I'm using dash-leaflet to parse the geobuf:
https://github.com/thedirtyfew/dash-leaflet/blob/master/src/lib/utils.js#L54

As a temporary solution I instead use pygeobuf to decode the string, which works perfectly fine:
https://github.com/pygeobuf/pygeobuf

If I decode with pygeobuf and encode back, I can decode the string with geobuf.js/dash-leaflet. I also notice there are fewer newlines in the string after this:
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

I think there must be a problem with the js decoder, since the python decoder works fine with PostGIS.

For context this is the GeoJson:
{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1827584,56.6820249],[9.1835135,56.6824076],[9.1868848,56.684492]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1868848,56.684492],[9.1891818,56.6859091]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1891818,56.6859091],[9.1902469,56.6865514],[9.1907314,56.6867975],[9.1913843,56.6870543],[9.1921178,56.6872902]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1921178,56.6872902],[9.1928196,56.6874594],[9.1935952,56.6875912]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1935952,56.6875912],[9.1992813,56.6882486]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1992813,56.6882486],[9.1999049,56.6883627],[9.2004634,56.6885262],[9.2009485,56.688712],[9.2014049,56.6889408]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.2014049,56.6889408],[9.2018453,56.6892112],[9.2033332,56.6902532],[9.2041326,56.6909117]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1827584,56.6820249],[9.1827898,56.6819101],[9.1827726,56.6818394],[9.1802005,56.6781717]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1802005,56.6781717],[9.1792926,56.676917]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1792926,56.676917],[9.1781464,56.6752693]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1781464,56.6752693],[9.1779721,56.6748395],[9.1779399,56.6745565],[9.1779292,56.6742677],[9.1780043,56.6739376],[9.1781437,56.6736606],[9.1787553,56.6728],[9.1788733,56.6725819],[9.1789913,56.6721869],[9.1789806,56.6719629],[9.178927,56.6717153],[9.1788626,56.671509],[9.1784549,56.6704774]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1784549,56.6704774],[9.1785085,56.6703595]]},"properties":{"count":"11"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[9.1785085,56.6703595],[9.178648,56.6702121],[9.1800535,56.6691451],[9.181695,56.6683434],[9.1819873,56.6682431],[9.1821992,56.668224],[9.1825533,56.6683271]]},"properties":{"count":"13"}}]}

[jmealo]

I'm getting this error as well. Did you find a solution?

[mawi510]

I known it's an old issue but I just posted a response to a similar issue for the Python implementation of Geobuf.

It seems to be an issue with the dimensions. If you patch the dimension to equal 2, you can decode the data correctly. I don't know JS but I was able to re-create this in Python:

data_str = base64.b64decode('''

CgVjb3VudCLTAwoeChQIAhoQzvjgCNKYhzbmC/4F1jTIIGoCGAtyAgAAChoKEAgCGgyKueEImL+H NvIjlBZqAhgLcgIAAAomChwIAhoY/NzhCKzVhzbSEIQKygfsA5oKggS6C9gDagIYC3ICAAAKHgoU CAIaEOyK4gj26oc2/ArSApAMiAJqAhgLcgIAAAoaChAIAhoM+KHiCNDvhzbsWKIKagIYC3ICAAAK JgocCAIaGOT64gjy+Yc23gnkAd4IyALKB/ICkAfKA2oCGAtyAgAACiIKGAgCGhT6m+MI2oSINvIG ngSgF6QQvgykCmoCGAtyAgAACiAKFggCGhLO+OAI0piHNj7jASGNAZcopzlqAhgLcgIAAAoaChAI AhoM0tDgCLjchjaXDs0TagIYC3ICAAAKGgoQCAIaDLrC4AjqyIY28xHdGWoCGAtyAgAACkEKNwgC GjPGsOAIjK+GNtsC2wZBtQQTwQSWAZMFlgKpBMgJuQ3sAbMD7AGVBhW/A2vtA3+dA68GjRBqAhgL cgIAAAoZCg8IAhoLrrXgCJzkhTZs6wFqAhgLcgIAAAotCiMIAhofmrbgCLDihTaWAqUC/BXVENIZ wwzKBMcBqAMnxAXQAWoCGA1yAgAA

''')

data = geobuf_pb2.Data()
data.ParseFromString(data_str)

if data.dimensions != 2:
    data.dimensions = 2

# SerializeToString is a protobuf method to convert proto data to string, which geobuf can now decode
print(geobuf.decode(data.SerializeToString()))

#{'type': 'FeatureCollection',
#  'features': [OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9182759.0, 56682025.0],
#                                [9183514.0, 56682408.0],
#                                [9186885.0, 56684492.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9186885.0, 56684492.0],
#                                [9189182.0, 56685910.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9189182.0, 56685910.0],
#                                [9190247.0, 56686552.0],
#                                [9190732.0, 56686798.0],
#                                [9191385.0, 56687055.0],
#                                [9192118.0, 56687291.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9192118.0, 56687291.0],
#                                [9192820.0, 56687460.0],
#                                [9193596.0, 56687592.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9193596.0, 56687592.0],
#                                [9199282.0, 56688249.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9199282.0, 56688249.0],
#                                [9199905.0, 56688363.0],
#                                [9200464.0, 56688527.0],
#                                [9200949.0, 56688712.0],
#                                [9201405.0, 56688941.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9201405.0, 56688941.0],
#                                [9201846.0, 56689212.0],
#                                [9203334.0, 56690254.0],
#                                [9204133.0, 56690912.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9182759.0, 56682025.0],
#                                [9182790.0, 56681911.0],
#                                [9182773.0, 56681840.0],
#                                [9180201.0, 56678172.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9180201.0, 56678172.0],
#                                [9179293.0, 56676917.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9179293.0, 56676917.0],
#                                [9178147.0, 56675270.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9178147.0, 56675270.0],
#                                [9177973.0, 56674840.0],
#                                [9177940.0, 56674557.0],
#                                [9177930.0, 56674268.0],
#                                [9178005.0, 56673938.0],
#                                [9178144.0, 56673661.0],
#                                [9178756.0, 56672800.0],
#                                [9178874.0, 56672582.0],
#                                [9178992.0, 56672187.0],
#                                [9178981.0, 56671963.0],
#                                [9178927.0, 56671716.0],
#                                [9178863.0, 56671509.0],
#                                [9178455.0, 56670478.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9178455.0, 56670478.0],
#                                [9178509.0, 56670360.0]])])),
#                ('properties', {'count': 11})]),
#   OrderedDict([('type', 'Feature'),
#                ('geometry',
#                 OrderedDict([('type', 'LineString'),
#                              ('coordinates',
#                               [[9178509.0, 56670360.0],
#                                [9178648.0, 56670213.0],
#                                [9180054.0, 56669146.0],
#                                [9181695.0, 56668344.0],
#                                [9181988.0, 56668244.0],
#                                [9182200.0, 56668224.0],
#                                [9182554.0, 56668328.0]])])),
#                ('properties', {'count': 13})])]}