Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

Hi Garth, Good point. I expect this has more to do with the satellite constellation at the time of the measurement than anything else. Some reading I have been doing suggest Glonass as being slightly less accurate. This could be caused by atomic clock precision, or less accurate

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

A QGIS reader pointed me to a Sep 2019 US Forest Service report, , which compares the accuracy of various GPS instruments. Their Garmin eTrex 30 section stated that the eTrex's accuracy was ~ 3X poorer when using GPS+GLONASS instead

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

Thanks for that very intriguing info, which I had missed. For others interested the link mentioned is found in Qgis-user Digest, Vol 171, Issue 50 Message: 5 From: Randal Hale where Randy provides this link: Which provides

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

On 5/31/2020 1:20 PM, Garth Fletcher wrote: The eTrex was receiving both US GPS and Russian GLONASS satellites, plus WAAS (as indicated by a "D" in the Garmin's satellite signal bars). earlier in this (very interesting)

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

I have added some data to my earlier report, both from my Garmin eTrex and from a Bad Elf Surveyor. As described earlier I established an accurately measured test location (± 2.4 cm) and taken 17 readings with my Garmin eTrex 20, distributed over a 10 hour period. The eTrex was receiving both US

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

for the correction and the additional information. Much >>>> appreciated. >>>> >>>> My current thinking is that in the archaeology we do, the intra-site >>>> (relative) measurements are quite good but what is inaccurate is the >>>> absolute measuremen

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

tra-site >>> (relative) measurements are quite good but what is inaccurate is the >>> absolute measurements. We can set out our grids with cm accuracy but can >>> only locate them on the ground with 10s of metre accuracy. It would be good >>> to have a low cost

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

that >> took time and/or was off-line. >> >> Ray Carpenter, >> Chapel Archaeology >> >> -Original Message- >> From: Garth Fletcher [mailto:ga...@jacqcad.com] >> Sent: 27 May 2020 15:25 >> To: QGIS.USER; qgis-user@lists.osgeo.org >

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

gps is switched on you walk exactly to the buried pin with no deviation and hit immediately. From: Qgis-user on behalf of QGIS.USER Sent: 27 May 2020 16:19 To: 'Garth Fletcher' ; qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

On 25.05.20 22:33, Garth Fletcher wrote: Nicolas Cadieux wrote: ... The only way, as I see it, that GARMIN  is "privatizing the geography", as you nicely put it, is by selling map to their map capable units.  It would be nice to have the capability of uploading our own maps to those units. 

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

5:25 > To: QGIS.USER; qgis-user@lists.osgeo.org > Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from, a > cell phone > > Hi Ray, > > Apologies for the typo - I had typed iGS3, but iG3s is the right number. > > iGage > <https://smex-ctp.trendm

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

...@jacqcad.com] Sent: 27 May 2020 15:25 To: QGIS.USER; qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone Hi Ray, Apologies for the typo - I had typed iGS3, but iG3s is the right number. iGage iG3s, now replaced by the iG4 which adds Galileo

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

Hi Ray, Apologies for the typo - I had typed iGS3, but iG3s is the right number. iGage iG3s, now replaced by the iG4 which adds Galileo tracking but otherwise seems very similar to the iG3s. $2400 US. These track satellites from the US GPS, Russian GLONASS, Chinese BeiDou and, with the iG4,

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

Sent: 27 May 2020 04:29 To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone I gathered some field data using my Garmin eTrex 20. It was placed in a fixed location in a small field and 17 readings were taken (using Mark Waypoint)

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

I gathered some field data using my Garmin eTrex 20. It was placed in a fixed location in a small field and 17 readings were taken (using Mark Waypoint) at various intervals between 11 AM and 10 PM (EST). The Garmin generally estimated the error band at 3 to 3.6 m. The Garmin was receiving both

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Dear Jochen et al, ...thanks, but it is 100% incorrect that Google Earth made satellite data available, and/or for free, e.g. Landsat. The opposite is the case (Landsat was made open by the Clinton administration etc much before that, by law. It's widely paid by US tax money btw) ; so Google

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Falk and list, On Mon, May 25, 2020 at 11:55 AM Falk Huettmann wrote: > Dear Chris et al, > > ...by using certain specific/clumsy formats -poorly documented ones - you > can virtually exclude > people from data and from Remote Sensing data and GPS etc. > Google Earth as a classic example, and

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell, phone

Nicolas Cadieux wrote: ... The only way, as I see it, that GARMIN is "privatizing the geography", as you nicely put it, is by selling map to their map capable units. It would be nice to have the capability of uploading our own maps to those units. Apart from that, positions, waypoints

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Hi, while I agree that there are lots of bad examples of proprietary formats, I want to say a few words to some of your examples: It is true that OpenStreetMap data is difficult to handle -  this is not because it is closed, but because it is open. When the project was started the goal was to

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

ists.osgeo.org <mailto:qgis-user@lists.osgeo.org> mailto:qgis-user@lists.osgeo.org>> > *Subject:* Re: [Qgis-user] wishing for accurate lattitude/longitude from > a cell phone > > > Hi Steve, > > I

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Dear Chris et al, ...by using certain specific/clumsy formats -poorly documented ones - you can virtually exclude people from data and from Remote Sensing data and GPS etc. Google Earth as a classic example, and GARMIN as another, or ESRI files, certainly NetCDF or many R packages even. In

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

On 5/25/2020 11:31 AM, chris hermansen wrote: One of many articles that may be of interest https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi?view=all That module doesn't appear to output the sort of information

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Falk and list; On Mon, May 25, 2020 at 10:48 AM Falk Huettmann wrote: > Dear List, > I think these GPS high resolution suggestions are great; > thanks. > > But my real interest/question here is, how can we bring it home to QGIS ? > > I see GARMIN essentially trying to sell and impose on us

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

ble accuracy implementation for QField is >> welcome, as mentioned ot the webpage. It is already a very usable and >> FLOSS GIS solution for the field, especially useful if you have a QGIS >> workflow already ;) >> >> Finding proper solutions and recommendations still

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

ehalf of > j.hu...@post-ist-da.de <mailto:j.hu...@post-ist-da.de> mailto:j.hu...@post-ist-da.de>> > *Sent:* 23 May 2020 20:35 > *To:* qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org> mailto:qgis-user@lists.osgeo.org>> > *Subject:

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

for QField is > welcome, as mentioned ot the webpage. It is already a very usable and > FLOSS GIS solution for the field, especially useful if you have a QGIS > workflow already ;) > > Finding proper solutions and recommendations still required... > > > > > ----

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

solutions and recommendations still required... > > *From:* Qgis-user on behalf of > j.hu...@post-ist-da.de > *Sent:* 23 May 2020 20:35 > *To:* qgis-user@lists.osgeo.org > *Subject:* Re: [Qgis-user] wishing

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

For years we did surveys with a customized solution with a Starfire GPS ( https://en.m.wikipedia.org/wiki/StarFire_(navigation_system)). It needs a subscription for best accuracy (see https://www.navcomtech.com/en/product/globalcorrectionservice/). It was linked to a trimble handheld data

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

The situation I was working with involved 30 points, some involving long hikes through the woods, spread around the periphery of a 36 square mile area with heavy foliage and poor or non-existent cell phone coverage. This precluded the use of any real-time reference base signals. My solution

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

he etrex cannot. > J > > -Original Message- > From: Qgis-user On Behalf Of Priv.-Doz. Dr. Maria Shinoto > Sent: Saturday, May 23, 2020 19:26 > To: Garth Fletcher > Cc: qgis-user@lists.osgeo.org > Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude fr

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

>>> Furthermore, I stumble upon an article about a module with u-blox chip. >>>>>> https://www.sparkfun.com/products/16481 >>>>>> Does anyone have any experience with modules like this and what else is >>>>>> needed? The description of all the s

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

icolas.cadi...@archeotec.ca> Sent: 23 May 2020 16:34 To: Randal Hale <mailto:rjh...@northrivergeographic.com> Cc: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> <mailto:qgis-user@lists.osgeo.org> Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

alf Of Priv.-Doz. Dr. Maria Shinoto Sent: Saturday, May 23, 2020 19:26 To: Garth Fletcher Cc: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone This discussion is interesting and very helpful. Some remarks from our experiences in a dens

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

dal Hale <mailto:rjh...@northrivergeographic.com> *Cc:* qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org> <mailto:qgis-user@lists.osgeo.org> *Subject:* Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone CAUTION: This

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

coordinates ... play.google.com From: Qgis-user on behalf of j.hu...@post-ist-da.de Sent: 23 May 2020 20:35 To: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone CAUTION: This mail comes from outside th

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

This discussion is interesting and very helpful. Some remarks from our experiences in a densely forested region with narrow valleys and steep slopes, lots of water floating in creeks and abandoned rice paddies -- water all around. ANTENNA: The antenna of Garmin 64 is a lot quicker in

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

t;mailto:qgis-user-boun...@lists.osgeo.org> on behalf of Nicolas Cadieux <mailto:nicolas.cadi...@archeotec.ca> Sent: 23 May 2020 16:34 To: Randal Hale <mailto:rjh...@northrivergeographic.com> Cc: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> <mailto:qgis-use

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Sent: 23 May 2020 16:34 To: Randal Hale Cc: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone CAUTION: This mail comes from outside the University. Please consider this before opening attachments, clicking links, or acting on the

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

es, but one frequently ignored issue, intimately associated with > sampling design, scale and permanence of plots, is how to locate positions > accurately. > besjournals.onlinelibrary.wiley.com > > -- > *From:* Qgis-user > on behalf of Nicola

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

I got involved in a project to locate the actual boundary monuments which delimit our town. The USGS 7.5' topographic maps appeared to be in error at some locations by several hundred feet. About 30 monument locations were involved. We are in rural NH which is mostly wooded, which results

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

gt;>> long‐term monitoring, for example, the paper on spatial scaling in >>> ecology has been cited over 1500 times, but one frequently ignored >>> issue, intimately associated with sampling design, scale and >>> permanence of plots, is how to locate positions

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Hi Steve, I think there are two different aspects to your question: 1) Accuracy of GPS Devices I agree with others that you can't expect a better accuracy than the 10 to 30 feet you observed with a smartphone or a simple handheld GPS. This might improve by averaging, but this takes time. Survey

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

On 5/23/2020 11:51 AM, Bernd Vogelgesang wrote: Unfortunately, the Forest Service Website went offline (maybe this thread caused so much traffic that it broke down? ;) ) I've attached the spreadsheet from the link.

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

issue, intimately associated with >> sampling design, scale and permanence of plots, is how to locate positions >> accurately. >> besjournals.onlinelibrary.wiley.com >> >> From: Qgis-user on behalf of Nicolas >> Cadieux >> Sent: 23 May 2020 16:34 >

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

ts.osgeo.org *Subject:* Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone CAUTION: This mail comes from outside the University. Please consider this before opening attachments, clicking links, or acting on the content. Hi, This is a very interesting list. It basically con

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone One other thing that may or may not be of use but the USDA Forest Service Publishes a GPS Receiver Report that covers phones - and that's helped if I've had a client go "Well I have a Apple or a Android ". At le

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Hi, This is a very interesting list. It basically confirms what I thought. Consumer Point and shoot deceives are all around 2-6m with no canopy. The average multiple positions basically give you a better idea as a gps may get lucky. It would be nice to have the full methodology for this and

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

One other thing that may or may not be of use but the USDA Forest Service Publishes a GPS Receiver Report that covers phones - and that's helped if I've had a client go "Well I have a Apple or a Android ". At least I feel slightly better going "good enough" or "no not good enough". It

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

Somehow I did not follow the discussion, but like to add some of our experience. We are doing field work in a remote region in the southern Japanese mountains, archaeological surveys on the ground based on LiDAR data. A simple Garmin etrex10 is mostly reliable in an area of 40cm by 40cm