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Am/Fm system for stormwater and undergroundwater facilities

Alper Çabuk
Alper Çabuk
Associate professor
Department of Architecture,
Anadolu University, Eskisehir, Turkey
Email:acabuk@anadolu.edu.tr

Kamil Eren
Kamil Eren
president
Geotech Group
Email:keren@ags-group.com

Saye Nihan Çabuk
Saye Nihan Çabuk
Odunpazari Municipality Directorate of Planning Eskisehir, Turkey
Email:sncabuk@anadolu.edu.tr


FIELD AND OFFICE WORKS CARRIED OUT IN THE PROJECT

RTK GPS Applications
Applications of the RTK surveys in Riyadh for storm water manholes and catchbasin are explained below.
  1. At the beginning, some RTK tests were conducted to determine the range level of radios and achieved accuracy. Polygon points, which has been observed by fast static Differential GPS, to determine the difference between two systems coordinates to determine the locations of the points polygon ST28 has been determined as a base station. M412 polygons data, which has been located in 3 km radius from base station, has been taken with no signal loose in 3 second time period. This radius has been determine as maximum distance from the base station and continued to the observations in this range. Results of these polygons with two different systems have been shown in the Table 1, Figure 1.
  2. Crew has started to observe the manholes to see the efficient of RTK system. All workday long 115 points have been observed by this system.
  3. Crew has started to observe the manholes in Jazerah Region, which has not been any manhole observed before. A base station has been used, which has been determined and observed before. Quantity of manholes and catch basins that observed is 145 all workday long.
  4. Fourth day of the test started at 7.00 AM and data for 230 manholes and catch basins has been collected.
  5. Fifth day of the test a few loose signal has been detected because of long distance. And new base station has been determined and observed. Location of base station has been moved to its new location. Data for 170 manholes and catch basins has been collected.
The work in this area has continued for more than 4 days and totally 1241 manholes and catch basins and also 54 polygons observation by using RTK system.


Fig.1: View that shows the points which has been observed in two systems.


Fig.2: An example to daily work preparation on IKONOS Image and control points on IKONOS Image

Table 1: The difference of position data of the polygons that has been observed RTK and Fast Static GPS system

Crews had very efficiency product between 7.00 AM and 12.00 PM in the work. After 12.00 PM even some reduce in the quantity of the satellites as detected work has continued till 15.00. After this time period completely loose with the radio or satellite signals has been detected. Radio signal cut off have been detected when crew is 1 km away from the base station using 1Watt radio modem. Effect of the high buildings, trees, radio or TV towers, military areas has been detected.

Office Works and Field Survey
The study areas were determined using IKONOS image of Riyadh and the work areas were marked and plotted daily. The hardcopies of these images were also a guide for survey crews to locate the points. An example is shown is Fig. 2.

The collected data were transferred into a text document daily and saved with the survey date as a file name. The information about the surveyed points was transferred into drawings using a in-house developed application program and MS Access Database automatically using our application according to the text file and MS Access Database were linked to Microstation Geographics. All the as built plans of the utility were scanned and registered according to base map. These images were used only as a guide to locate the directions of the pipelines. Our office team digitized the pipelines using these images as a guide with a house made automatic mapping application tool. Some applications were developed for data linking, data editing and pipeline drawing. In the office team we were working with seven people to organize the system, prepare the working areas and proper information for survey crews, developing application programs and enter the data.


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