Suggestion

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Suggestion

مُساهمة من طرف Abdulkarim في الإثنين 16 مارس 2009, 5:36 pm

Dear Admins and registered users of this forum

I need your feedback on my following suggestion
Since we do surveying work on daily basis on one form or another, I would say that the best way for us to learn and improve the way we do our work is by everyone participating and stating

The type of surveying job they are doing
What equipment and software used
How field and office operations are conducted

This is because I might be doing a job that can easily be done if I get a different software or change the field data collection procedure or the office data processing. Collectively we can come up with the best practice in doing different types of surveying jobs. we can discuss Land , Areal photography and Hydrographic survey operations.

By the way, my name is Abdulkarim and I am working for a big Surveying company in Saudi Arabia

Abdulkarim

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تاريخ التسجيل : 07/01/2009

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رد: Suggestion

مُساهمة من طرف Admin في الأربعاء 18 مارس 2009, 3:08 pm

Dear Eng. Abdulkarim

First, let me welcome your message and appreciate your suggestion

Yes, I do agree with you that sharing knowledge and field experiences is an excellent way to improve our skills. This is the basic item in the so-called "team work;" which is unfortunately is not a common practice in Arabic countries! When you share your experience with other colleagues, you do not loose it ! However, you gain new ideas from their ways to perform the same jobs.

So, I expect you can be the first one to make this suggestion happens ! Why do not you tell us about your field experiences. Choose a specific surveying topic (resection, intersection, levelling, ….. etc), and explain to us how do you perform it , explain in details your procedures or steps. That will be very beneficial to all the members in this forum, and you will be rewarded from Allah Almighty.

Best Regards

_________________
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لمراسلة ادارة المنتدي: gpsgis2008@yahoo.com

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رد: Suggestion

مُساهمة من طرف Abdulkarim في الأربعاء 18 مارس 2009, 5:10 pm

Thanks Dr. for your feedback
I can mention some jobs that I can talk about in detail:
RTK jobs
Leveling and Geodetic leveling
Areal photography
GPS baseline processing and network adjustment
Datum projections and datum transformation (3 and 7 parameters and grid transformation)
Others

So, let us start with RTK which is the simplest
you can use any dual frequency receivers along with radio to transmit the correction. You need to have 2 know points in the ground (3D) and you set us your receiver (trimble 5700)on one point (called the base). you will have the GPS antenna connected to the GPS receiver and the GPS receiver is connected to radio modem which in turn is connected to radio antenna that will broadcast the correction. After the set up, you initialize the receiver and enter the name of of the control point. the receiver will compute the coordinate for the point (float solution) and then it will compute the correction since you have provided the exact coordinate of the point. this correction is then broadcasted through the radio. The other set up (the Rover) is similar to the base but the difference is the radio (instead of broadcast, it receives). Also, if you initialize the rover you do so but not as a base but rather as a rover. the receiver will compute the coordinate for any point and apply the correction received from the radio. this way, you get centimeter accuracy which is relative to the base. meaning that if the base coordinates are not accurate the new point will be not accurate but the vectors Delta XYZ from the base and the rover is accurate.

if you are using trimble, then the RTK points are stored in what is called a DC file. at the office, we use trimble Geomatics office software to import the DC file and output and ASCII file which will be imported to Microstation and all the CAD work is done and the final map is in a dgn format. if you have a gis system in place you can convert this dgn files to shape files (if you are using ESRI GIS software.
In case you do not have 2 ground controls to start the RTK work. you can start from a new point that you set at the site and keep the base receivers logging and preferably at 1 second interval and then move to another new points you set in the field and finish the job (data logging should be in Hours depending on how close existing controls are from the site). At the office you can perform post processing to get more accurate results for the base by connecting it to other know controls or getting an ITRF coordinate for them by passing the RINEX files to on line processing servers in Canada or AUPOS in Australia (preferred)

Admin: please feel free to edit my writing as i wrote it in a hurry and i do not review my writing most of the time (just one time deal)

readers:
you can help if you can suggest a short cut to what we are doing

Hope this helps and unless we share our knowledge we will be 500 light years behind the developed countries

Abdulkarim

عدد الرسائل : 8
تاريخ التسجيل : 07/01/2009

معاينة صفحة البيانات الشخصي للعضو

الرجوع الى أعلى الصفحة اذهب الى الأسفل

رد: Suggestion

مُساهمة من طرف Admin في الخميس 19 مارس 2009, 3:59 pm

Thanks a lot brother for this valuable and simple discussion. But, why do not you start a new topic in the forum and move your explanations to it? It will be more easier to other members to know the title of the topic you are going to discuss. I see that you are going to give us discussions in several surveying topics, so creating several pages in the forum will be optimum just for easily accessibility

Once again, thank a lot

_________________
منتدي أكاديمي غير ربحي لوجه الله تعالي و مرضاته
لمراسلة ادارة المنتدي: gpsgis2008@yahoo.com

Admin
Admin

عدد الرسائل : 1695
العمر : 54
العمل/الترفيه : أستاذ هندسة المساحة
تاريخ التسجيل : 29/12/2007

معاينة صفحة البيانات الشخصي للعضو http://surveying.ahlamontada.com

الرجوع الى أعلى الصفحة اذهب الى الأسفل

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