[gdal-dev] Ellipsoidal length of a line

[Nicolas Cadieux]

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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