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Support material for establishing the GBIF Hosted Portals
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Occurrence detail: Data contained in Gadm? #123

Closed langeveldNMR closed 3 years ago

langeveldNMR commented 3 years ago

In some records, the field Gadm is shown in the summary, in our portal e.g. with specimen NMR996800078335, see https://hp-nhm-rotterdam.gbif-staging.org/data?entity=2570262240&filter=eyJtdXN0Ijp7InEiOlsiTk1SOTk2ODAwMDc4MzM1Il19fQ%3D%3D This field in many cases with our data contains outdated topographical information on the municipality level for Dutch localities. Why is this included and how is it generated? We do not export it to GBIF ourselves.

MortenHofft commented 3 years ago

GADM is an interpretation layer. It is deduced from the coordinates and matched to GADM. It should be read as:

According to GADM this point is located in Netherlands > Zuid-Holland > Nederlek

It is useful as it can be applied across records unlike the free text field locality. And hence allow for breakdowns and search per GADM country/county/municipality/district/region etc.

The uncontrolled dwc terms locality and state province is the cause of issues and misunderstandings on GBIF.org where users assume that a search for stateProvince: Florida will return all records in Florida. It will in fact return results where the record owner has filled that field with that exact word. For GADM however it will get its value based on coordinates (which is far more often filled) - and the spelling is normalized to a shared vocabulary.

If GADM is wrong, then it should ideally be fixed at source. @MattBlissett what is the procedure for getting GADM updated? Do we just leave an issue with GADM and hope it will be changed in the next version?

MattBlissett commented 3 years ago

Hi,

The data is from the GADM database version 3.6, i.e. https://gadm.org/maps/NLD_1.html

Just from https://en.wikipedia.org/wiki/List_of_municipalities_in_South_Holland I can see this is some years out of date. It would be best if the GADM database were updated, i.e. by contacting the maintainer. Could you do that, @langeveldNMR, perhaps with a better source than Wikipedia? Or else let us know a source for the data and we can pass it on.

tucotuco commented 3 years ago

I have forwarded this message to GADM. Ideally, the suggested correction and a source for it should be sent to gadm using http://rasterra.com/contact/gadm_contact_form.

On Wed, Mar 24, 2021 at 2:07 AM Morten Høfft @.***> wrote:

GADM https://gadm.org/ is an interpretation layer. It is deduced from the coordinates and matched to GADM. It should be read as:

According to GADM this point is located in Netherlands > Zuid-Holland > Nederlek

It is useful as it can be applied across records unlike the free text field locality. And hence allow for breakdowns and search per GADM country/county/municipality/district/region etc.

The uncontrolled dwc terms locality and state province is the cause of issues and misunderstandings on GBIF.org where users assume that a search for stateProvince: Florida will return all records in Florida. It will in fact return results where the record owner has filled that field with that exact word. For GADM however it will get its value based on coordinates (which is far more often filled) - and the spelling is normalized to a shared vocabulary.

If GADM is wrong, then it should ideally be fixed at source. @MattBlissett https://github.com/MattBlissett what is the procedure for getting GADM updated? Do we just leave an issue with GADM and hope it will be changed in the next version?

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langeveldNMR commented 3 years ago

Thanks all! I have asked my colleague to contact GADM with the right current source using the contact form.

MattBlissett commented 3 years ago

Hi @langeveldNMR,

Would you mind looking at the regional boundaries for the Netherlands in GeoBoundaries, and seeing if they are more up-to-date? We are considering using these boundaries instead of GADM. (Just an initial investigation at this point.)

https://www.geoboundaries.org/geoContrast.html?country=NLD&mainSource=geoBoundaries+%28Open%29&comparisonSource=GADM+v3.6&mainLevel=2&comparisonLevel=2

It would be best to comment on https://github.com/gbif/portal-feedback/issues/3068 as the problem isn't related to the hosted portals.

abubelinha commented 2 years ago

It would be best to comment on https://github.com/gbif/portal-feedback/issues/3068 as the problem isn't related to the hosted portals.

@MattBlissett I commented something there. @abubelinha