[HOT] paths, tracks and unclassified in West Africa

Robert Banick rbanick at gmail.com
Thu Jul 16 13:13:04 UTC 2015


That makes sense. Would you suggest putting road classification into the
validation stage then? Or have a classification stage in between?

On Thu, Jul 16, 2015 at 9:03 AM, john whelan <jwhelan0112 at gmail.com> wrote:

> The suggestion is not that Primary / secondary / tertiary should not be
> mapped, often when the HOT mappers start the major highways are tagged
> Primary / secondary / tertiary the suggestion is to simplify guidance to
> new or inexperienced mappers.  76% of HOT Nepal mappers mapped for an hour
> or two and that was it.
>
> I don't think we can afford to give them four hours training in how to
> classify a road, there would be no time left for mapping.
>
> For these sort of highways then map something and let someone else upgrade
> the tag to Primary / secondary / tertiary is my suggestion.
>
> Cheerio John
>
> On 16 July 2015 at 08:55, Robert Banick <rbanick at gmail.com> wrote:
>
>> Hey all,
>>
>> Speaking as a humanitarian GISer who's used HOT road layers quite a bit
>> in a few crises, the road classifications really help. Primary / secondary
>> / tertiary are useful, albeit vey incomplete, measures of the importance of
>> roads that we can use to eyeball transit times etc. I would be strongly
>> against ignoring those classification tags. I do agree we need more
>> consistency in how they're applied however.
>>
>> Perhaps we can have general regional guidelines and then someone gets
>> charged with developing a country-specific taxonomy for any major
>> activations?
>>
>> Best,
>> Robert
>>
>> On Thu, Jul 16, 2015 at 8:44 AM, john whelan <jwhelan0112 at gmail.com>
>> wrote:
>>
>>> Given that HOT mappers often do not have a PhD in African road
>>> classification and it appears to be subjective perhaps we can come up with
>>> a useful simplified interpretation or guidelines for inexperienced mappers?
>>>
>>> My thoughts would be to suggest that mappers in general ignore primary,
>>> secondary, tertiary, classifications, if the road is mapped then a local or
>>> classification specialist can tag with one of these if required.
>>>
>>> Cheerio John
>>>
>>> On 16 July 2015 at 00:23, Thomas Gertin <tgertin at gmail.com> wrote:
>>>
>>>> I am adding to the discussion of highway tagging in West Africa. All of
>>>> the projects that mapped highways in West Africa that I have seen or been a
>>>> part of followed the guidance of the Highway Tag Africa wiki page (
>>>> http://wiki.openstreetmap.org/wiki/Highway_Tag_Africa).
>>>>
>>>> This past Spring I worked with some colleagues to create this tracing
>>>> guide (http://hotosm.github.io/tracing-guides/guide/liberia.html) for
>>>> mapping River Cress and Grand Gedeh Counties in West Africa. The tracing
>>>> guide was based on our interpretation of the Highway Tag Africa wiki page.
>>>> This tracing guide is quite good, and mappers appreciated the pictures and
>>>> GIFs that show examples.
>>>>
>>>> When building the tracing guide I came to a few conclusions. When
>>>> reading the Highway Tag Africa wiki page I felt it have been wrong for me
>>>> to alter the instructions. It would have resulted in inconsistent tagging
>>>> in the region. I trust that a good amount of research and discussion has
>>>> taken place to get it to the point it is now.
>>>>
>>>> - The guidance in the wiki could have been clearer. Although I notice
>>>> that is has improved since even a few months ago, there are now some
>>>> example pictures in there.
>>>>
>>>> - It is difficult to teach someone how to classify highways. There are
>>>> eight types and often it is not clear when deciding between primary,
>>>> secondary, tertiary, and unclassified highways because the only difference
>>>> between them is the subjective size of the urban areas that are connected
>>>> by them.
>>>>
>>>> - The unclassified road type was unintuitive the first time I read the
>>>> Highway Tag Africa wiki page. To me unclassified means something that has
>>>> no classification. Yet in the Highway Tag Africa wiki page it clearly has a
>>>> classification. I think the term ‘unclassified’ means something else in
>>>> other places though.
>>>>
>>>> I think having pre-set tags available as a plugins to iD editor should
>>>> be a HOT goal, if it isn’t already. I don’t think we need there to be a
>>>> universal tagging set. People who set-up projects on the Tasking manager
>>>> could define the tags that fit best for the project. Although I think it
>>>> would be useful to further standardize some tags across many geographical
>>>> areas; it is important to maintain the flexibility for the geographical
>>>> areas that need unique tags.
>>>>
>>>> Thanks,
>>>> Tom G
>>>>
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>>>>
>>>>
>>>
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>>
>
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