Extracting z information from a point layer

[zakigates]

I am using qfield and I am wondering if there is a way to get the elevation information from gps and display it in a field that I would create in qgis just like x and y coordinates.

[zakigates]

waiting for your aswers

[m-kuhn]

Yes, it is. Just set z($geometry) as default value for this field.
It would be great if you could add this information to the documentation!

[zakigates]

This is not working because in qfield they don't give the z value, just x and y.

[m-kuhn]

This is not working

that could be true for you

because in qfield they don't give the z value, just x and y.

that's wrong

[zakigates]

I did z ($geometry) but when I added a new feature point qfield did not return the z value in the reserved field. I got just x and y. Le 18 août 2017 12:45, "Matthias Kuhn" <[email protected]> a écrit :

…

[image: Boxbe] <https://www.boxbe.com/overview> Matthias Kuhn ( ***@***.***) is not on your Guest List <https://www.boxbe.com/approved-list?tc_serial=32154594277&tc_rand=373133100&utm_source=stf&utm_medium=email&utm_campaign=ANNO_MWTP&utm_content=001&key=pXlPq6aU3bTfz0HBK3k5u6ru2tqGc16lWpok8duIxfU%3D&token=05oLl7D50vNdl%2Bz1I2nBng22PwsucEyblFeaQ63SiVIO%2BqUBCY3XNY2XkAsAkRaa> | Approve sender <https://www.boxbe.com/anno?tc_serial=32154594277&tc_rand=373133100&utm_source=stf&utm_medium=email&utm_campaign=ANNO_MWTP&utm_content=001&key=pXlPq6aU3bTfz0HBK3k5u6ru2tqGc16lWpok8duIxfU%3D&token=05oLl7D50vNdl%2Bz1I2nBng22PwsucEyblFeaQ63SiVIO%2BqUBCY3XNY2XkAsAkRaa> | Approve domain <https://www.boxbe.com/anno?tc_serial=32154594277&tc_rand=373133100&utm_source=stf&utm_medium=email&utm_campaign=ANNO_MWTP&utm_content=001&dom&key=pXlPq6aU3bTfz0HBK3k5u6ru2tqGc16lWpok8duIxfU%3D&token=05oLl7D50vNdl%2Bz1I2nBng22PwsucEyblFeaQ63SiVIO%2BqUBCY3XNY2XkAsAkRaa> Yes, it is. Just set z($geometry) as default value for this field. It would be great if you could add this information to the documentation! — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#159 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AcpfbsJgQ9mXSqNo8bhtQOf0VYRmoPKEks5sZXTQgaJpZM4O7Yv_> .

[m-kuhn]

Did you link the crosshair to the positioning sensor?

[zakigates]

Yes i did it but still no result. When I add a point via the crosshair this one is not added I don't know why and no information about the z Le 16 oct. 2017 10:14, "Matthias Kuhn" <[email protected]> a écrit :

…

Did you link the crosshair to the positioning sensor? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#159 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AcpfbgQP-gjjM6Lcl7t0fr70WvIpUDG7ks5ssx6AgaJpZM4O7Yv_> .

[zakigates]

here is a screen shot frm qfield as you see I'm using tge screenhair but nothing displayed in the z field this the configuration of the z field on qgis [image: Images intégrées 1] 2017-10-16 11:23 GMT+02:00 zakaria mouqcit <[email protected]>:

…

Yes i did it but still no result. When I add a point via the crosshair this one is not added I don't know why and no information about the z Le 16 oct. 2017 10:14, "Matthias Kuhn" ***@***.***> a écrit : > Did you link the crosshair to the positioning sensor? > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#159 (comment)>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AcpfbgQP-gjjM6Lcl7t0fr70WvIpUDG7ks5ssx6AgaJpZM4O7Yv_> > . >

[m-kuhn]

I guess you need to use the github interface, the image does not show up unfortunately.

[zakigates]

here is a screen shot from qfield
as you see I'm using the crosshair but nothing displayed in the z field

and this is how I set my z field on qgis

[m-kuhn]

Can you turn on the GPS information display (long click on the blue GPS icon) and make a screenshot?

[zakigates]

This is it

[m-kuhn]

Looks like your positioning device doesn't expose any altitude information.
Do you have this information available in any other app?

[zakigates]

I succeeded to get the z value in qfield Thanks so much for your precious help. but I still have a problem when I try to synchronize with qgis I get this python error

UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 30: ordinal not in range(128)
I seriously don't understand it. If you have any idea about it source tell me I would be very thakfull

[m-kuhn]

Good to hear that your issues could be sorted out.

It would be very handy for the general public if you could write down the missing information in the documentation. Thanks!

[geomoes]

after trying to get it work I figured out, that I can use the following function to get the altitude when digitizing points with an external GPS device. Just create a altitude field (e.g. altitude, real) and add as default value the following function to get the altitude of points:
z(@position_coordinate).
Maybe it would be worth to add it as hint to the documentation.

[m-kuhn]

Issue opened opengisch/QField-docs#76

Would be great if someone could add this information to the docs !