[gdal-dev] Ellipsoidal length of a line

[Andrew Bell]

How is the line defined? If you have a function, there's calculus.

On Sat, Jun 15, 2019, 12:43 AM Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
wrote:

> Thanks,
> Could work but I think this will be too slow. I wonder how QGIS does it? I
> guess they use code from Proj.4.  If anyone has an other idea, shoot!
> Cheers
> Nicolas
>
> Le 14 juin 2019 à 13:20, Patrick Young <patrick.mckendree.young at gmail.com>
> a écrit :
>
> Not exactly what you want, but you can do this with PostGIS by casting
> your geometry to the geography type:
>
> https://postgis.net/workshops/postgis-intro/geography.html
>
> On Fri, Jun 14, 2019 at 10:26 AM Atle Frenvik Sveen <atle at frenviksveen.net>
> wrote:
>
>> Hi!
>>
>> Not sure if would want to use gdal for this task*, but take a look at
>> this blog post:
>>
>> https://janakiev.com/blog/gps-points-distance-python/
>>
>>
>> *or if it's doable, i guess not, since the scope of gdal is
>> reading/writing geospatial formats
>>
>> -a
>>
>> -
>>   Atle Frenvik Sveen
>>   atle at frenviksveen.net
>>   45278689
>>   atlefren.net
>>
>> On Fri, Jun 14, 2019, at 17:32, Nicolas Cadieux wrote:
>> > Hi,
>> >
>> > I am trying to get the length of a line in python. (Not just the
>> > straight length between the first and last nodes).  Using geopandas,
>> > (therefore the Shapely lib) I am getting the euclidien distance even
>> > though the dataframe holdings the line geometries has a CRS (WGS84,
>> > zone UTM 18 S).  Obviously, the WGS84 Ellipsoid is not taken into
>> > account.
>> >
>> > Can I do this with gdal/ogr?
>> >
>> > Thanks for the help
>> > Nicolas
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