Hey y??all,
I am looking to learn some regarding GPS RTK surveys and I am having a hard time getting details online. I wanted to know if RTK surveys can be performed under tree cover? Or how dense does the tree cover have to be to completely block out the Gps signals? Can gps surveys used for topo Surveys in a tree covered lot?Also what??s the difference between static and fast RMS VS RTK??ÿ
Do you have rtk now?
Are you from the south?
Where are you getting leadership in this endeavor?
Wasting you time trying to use GPS under tree cover for a topo. Use a total station.
RTK is Real time Kinematic. The solution is available in real time. The other methods are post-processed.
You won't find a readers digest short answer to your question. Suggest this book to give you a better handle on GPS/GNSS surveying. Tree canopy as well as other obstructions create multi path which degrades the accuracy. Some receivers deal with it better than others, but a rule of thumb the denser the canopy the higher the MP and consequently RTK loses its advantage over a total station.?ÿ
If you're questioning the tree coverage/canopy before you've even started, then they're probably going to be an issue.
Suggest this book to give you a better handle on GPS/GNSS surveying.
You can learn quite a bit from that book, but I was disappointed in its piecemeal (dis)organization and lack of depth on some important topics.?ÿ The parts that do try to go deep read like they are cut and paste from somewhere without forming a cohesive treatment.
I am looking to learn some regarding GPS RTK surveys and I am having a hard time getting details online.
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1. I wanted to know if RTK surveys can be performed under tree cover?
Somewhat. Depends on the tree cover (see the next answer).?ÿ BTW- The acronym "GPS" is most correctly used for a system that uses only the American NAVSTAR satellites. Other countries (mostly Russia) also have satellites up. Systems that make use of those as well as NAVSTAR are called GNSS (Global Navigation Satellite Systems). GNSS systems perform much better in marginal conditions, such as under canopy, than GPS only systems, mainly just due to the number of available satellites.?ÿ?ÿ
2. Or how dense does the tree cover have to be to completely block out the GPS signals?
It would have to be very dense indeed to completely block out all GPS signals. But it doesn't have to be all that dense to block out enough to make working with RTK too inconvenient to bother with.?ÿ ?ÿAs a rough guide, when you are under tree canopy on a sunny day, look up. Can you see the sun? Like make it out as a round yellow thing??ÿ If so you will probably get RTK fix. If you can't you probably won't.
3. Can GPS surveys used for topo Surveys in a tree covered lot?
Possible, but usually more hassle than it's worth.?ÿ Use a total station for that.
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4. Also what??s the difference between static and fast RMS VS RTK??ÿ
I'm not familiar with "fast RMS". Possibly you mean "fast static"??ÿ With static you occupy a point for a period of time, from several minutes to several hours, then take the observed data back to the office and resolve a vector. Typically used for vectors many miles long . Maybe hundreds of miles. Fast static, from the user perspective, is just static where the length of the measured vector is relatively short - typically under 20 km - and therefore the occupation times are short, maybe as few as 5 minutes.?ÿ ?ÿ ?ÿ?ÿ
RTK gets you resolved vectors on the spot, at the data collector. As with Fast static the measured vectors must be short. The radio range between base and rover is usually the limiting factor anyway (cellular connections excepted). And VRN's are something else again.?ÿ?ÿ
just curious... your profile says you are licensed in Virginia.?ÿ ?ÿBut you're a "survey newbie" in this post and a "student' in your other post.?ÿ I hope you are getting some real world guidance and not trying to re invent the wheel here.?ÿ?ÿ
