Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 26
  1. #11
    Gold Member wcampbell47's Avatar
    Join Date
    Jul 2009
    Posts
    486
    Location
    Texas Coast
    Tractor
    Kubota 7510 and B3200

    Default Re: Android Phone GPS for farming????

    I have been using a Delorme product in my van since 2002. Accuracy is within 3 meters - the length of the van. One of the handheld products may fit your need. Our community has an area wide garage sale every year. I drive around to the address of each sale and plug the co-ordinates into the Street Atlas. I then print a map from Street Atlas that has a waypoint for each sale location. Don't know if one of the hand held units could do something similar.
    Caution: Some of my posts may be politically incorrect.
    Kubota B7510 & B3200

  2. #12
    Gold Member
    Join Date
    Nov 2011
    Posts
    275
    Location
    NSW, Australia
    Tractor
    Kioti RX6010C

    Default Re: Android Phone GPS for farming????

    Hi California

    Get a Garmin GPS unit. From your photo it should have no probs finding satellites and it will gibe you an accuracy of about +- 15 feet to 20 ft. Maybe an eTrex 20 which is about US $200. But look into what models are available. I have an eTrex Vista HCx for bush walking. I get 5m accuracy from it even in very steep gulleys.

    When you are at a new tree just add a waypoint. You can just click a button and add a location and even give it a number.

    Then download QGIS from Welcome to the Quantum GIS Project which is an open source (and free) GIS application and you can read in the waypoints and create a map of them and keep you map up-to-date with new trees. Make a layer of "new trees" and maybe a separate layer of "diseased trees" or "trees to cut down" etc.

    Mike

  3. #13
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,750
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Android Phone GPS for farming????

    I like the idea of a Garmin handheld hiking GPS. Or maybe an automotive dashboard unit. But I looked on Craigslist and Ebay, and even the used ones are as noted, around $200 if they are modern. I wish I had more uses to justify paying that much, but I'm too cheap to spend that for my very occasional use.

    I also Googled to learn the present state of the art in phone precision GPS. I thought it was farther along but it looks to me like this is still at the experimenter stage. For example 3~5 meter accuracy can be obtained IF you customize a precision-time application so your Android GPS ap can sync its clock to a frequently-updated master time standard. And the author of this precision clock software is asking for volunteers to host time servers in local communities all over the world, for the locals to sync to. That's definitely pre-release software development.

    I never found an off-the-shelf real time precision GPS/mapping/waypoints etc ap. I think in theory the phones are capable of it, they triangulate satellites same as a real GPS and can triangulate cell towers also for a faster lock - but as I said the software to make precision observations and get the readings into an on-screen map - in real time - seems to still be in the hands of experimenters.

    Mike, I looked at the QGIS website. I think their emphasis is developing software to read, integrate, overlay etc existing GIS data. I didn't see a section about acquiring data in the field, but it must be in there somewhere. I searched the current-release documentation for the word 'Android' and got only one hit:
    ... runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities....
    so after that search I don't know what else I could use from their site, if I don't buy a Garmin or similar that outputs industry-standard readings.

    Maybe the big farm GPS systems for tractor steering etc are all closed proprietary systems - my searching on phone GPS aps didn't find any overlap at all.

    I guess I should explain that this inquiry is as much intellectual curiosity as it is farming necessity. It's not that difficult to just drive every second orchard row looking for the new trees. I just thought an application would be out there by now.

    Still searching ...

  4. #14
    Veteran Member BillG_in_TX's Avatar
    Join Date
    Feb 2002
    Posts
    1,350
    Location
    Texas
    Tractor
    none any longer

    Default Re: Android Phone GPS for farming????

    Quote Originally Posted by California View Post
    I like the idea of a Garmin handheld hiking GPS. Or maybe an automotive dashboard unit. But I looked on Craigslist and Ebay, and even the used ones are as noted, around $200 if they are modern. I wish I had more uses to justify paying that much, but I'm too cheap to spend that for my very occasional use.

    Still searching ...
    How about this one: Garmin Etrex Legend GPS Plus Accessories - almost New
    Bill

  5. #15
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,750
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Android Phone GPS for farming????

    Quote Originally Posted by BillG_in_TX View Post
    Hmmm...

    My first search for info on that model shows it was put on the market over ten years ago. Amazon: Date First Available March 12, 2003
    Knowing nothing about this technology, I'm a little cautious to buy something that many generations back. The reviews on Amazon reinforce this concern:
    [2002 enthusiastic purchaser's 2008 update five years ago:]

    Update - July 2008:

    This was a good unit it it's day, but GPS technology has passed it by and the newer units are far better and don't cost much more. ... some of them are just a few bucks more than this dinosaur. [later models] have better reception, a color display, more map memory, fast USB connections and more. This uses the old serial connection that most PC don't even come with any more
    But I'll be near there on Wednesday so maybe I should look at it.

    Can anyone here comment on capabilities/limitations/obsolescence for that model?

    Thanks for bringing that to my attention!

  6. #16
    Elite Member
    Join Date
    May 2012
    Posts
    2,972
    Location
    Knoxville, TN
    Tractor
    Bobcat CT225

    Default

    For what it's worth GPS is capable of much higher accuracy, but civilian versions are limited to 3 meter accuracy to prevent someone from using it to guide in a missile or whatever. The military versions, which run off the exact same satellites, have much higher accuracy. So, basically, don't expect civilian versions to get any better unless the government changes its mind.

    My understanding is that you're right about farm systems being proprietary. You put transmitters up and they're used for the precise positioning.

  7. #17
    Super Member California's Avatar
    Join Date
    Jan 2004
    Posts
    5,750
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Android Phone GPS for farming????

    Is that the SA I was reading about? I thought they turned off that artificial, intentional timing 'jitter' a couple of years ago.

    I think this is why amateurs now are writing software to track the remaining satellite internal-clock variations, applying corrections that were always available to military, in order to improve accuracy.

  8. #18
    Elite Member
    Join Date
    May 2012
    Posts
    2,972
    Location
    Knoxville, TN
    Tractor
    Bobcat CT225

    Default Re: Android Phone GPS for farming????

    Quote Originally Posted by California View Post
    Is that the SA I was reading about? I thought they turned off that artificial, intentional timing 'jitter' a couple of years ago. I think this is why amateurs now are writing software to track the remaining satellite internal-clock variations, applying corrections that were always available to military, in order to improve accuracy.
    You can read more about the topic here, if you like: GPS.gov: GPS Accuracy. Selective Accuracy (SA) was phased out around 2000, but there are other reasons why civilian GPS is not as accurate as military. In order to achieve military levels of accuracy, you need custom hardware to track a separate GPS frequency, and/or you need additional proprietary hardware and ground-based transmitters. With civilian receivers that only track a single frequency, accuracy can be increased to some degree, but not down to the level of military receivers.

    However, I did see this, which was new information to me:

    The ongoing GPS modernization program is adding new civilian signals and frequencies to the GPS satellites, enabling ionospheric correction for all users. Eventually, the accuracy difference between military and civilian GPS will disappear.

  9. #19
    Gold Member
    Join Date
    Nov 2011
    Posts
    275
    Location
    NSW, Australia
    Tractor
    Kioti RX6010C

    Default Re: Android Phone GPS for farming????

    Hi California

    Quote Originally Posted by California View Post
    I like the idea of a Garmin handheld hiking GPS. ....
    I wish I had more uses to justify paying that much, but I'm too cheap to spend that for my very occasional use.
    I thought with that many trees it would be worthwhile to do things systematically with some appropriate technology to assist. Your correct in that GPS is they way to go but yes it's whether the software is out there to do what you want.

    Quote Originally Posted by California View Post
    Mike, I looked at the QGIS website. I think their emphasis is developing software to read, integrate, overlay etc existing GIS data. I didn't see a section about acquiring data in the field, but it must be in there somewhere. ......
    I guess I should explain that this inquiry is as much intellectual curiosity as it is farming necessity. ..... I just thought an application would be out there by now.
    Still searching ...
    The QGIS would work on your main Windows machine. You save the waypoints in the handheld GPS unit then the crappy Garmin software running on Windows downloads it from the GPS unit to your PC. It can save it in an open format called GPX (it's an plain text XML file of points). That can be opened and edited in any plain text editor. The GPX file can then be imported into the QGIS program. You can also if you have an aerial picture of your forest/farm have that as a layer in QGIS. So that's really all done in Windows. Use the Garmin in the field just to get GPS locations and also to navigate you to a specific spot.

    Basically I think the Android phone wont cut it for what you want to do but a Garmin + QGIS will. Besides its always fun to play with technology on your farm :-)

    Mike
    Mike

  10. #20
    Veteran Member BillG_in_TX's Avatar
    Join Date
    Feb 2002
    Posts
    1,350
    Location
    Texas
    Tractor
    none any longer

    Default Re: Android Phone GPS for farming????

    Yes, I would probably pass on that eTrex Legend because of the serial interface, and look for something newer. Even if you have a serial port on your computer, it's a royal pain in the a** to work with. I have a Magellan Meridian of about the same vintage, and that is its biggest limitation. It still works great, though, and I have consistently achieved 3 meter accuracy with it over the years, as long as I was patient and the tree cover wasn't too dense. Here's a description of one project I completed with it: http://www.tractorbynet.com/forums/r...tml#post701551
    Bill

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. Android App
    By radioman in forum News/Feedback
    Replies: 7
    Last Post: 11-30-2012, 09:40 PM
  2. Android Apps?
    By Tred Boyota in forum Related Topics
    Replies: 5
    Last Post: 08-23-2011, 12:15 PM
  3. Anyone else using the android app?
    By diesel_nut in forum Cub Cadet L&G
    Replies: 9
    Last Post: 07-03-2011, 12:20 AM
  4. Cell Phone - Droid X Smart Phone
    By Gale Hawkins in forum Related Topics
    Replies: 19
    Last Post: 11-05-2010, 08:22 PM
  5. Anyone have an Android phone?
    By Tororider in forum Rural Living
    Replies: 8
    Last Post: 01-11-2010, 10:06 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.