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SHANGHAI ESURVEY GNSS CO., LTD.

4.7 Free-Coding ............................................................................................................ 19

4.8 Laser Pointer .......................................................................................................... 20

4.9 Check Tie ................................................................................................................ 20

4.10 Main Settings ........................................................................................................ 21

4.11 Tracking ................................................................................................................ 21

4.12 Light On/Off .......................................................................................................... 21

4.13 Units ...................................................................................................................... 21

5 Menu Key ................................................................................................. 22

5.1 Overview ................................................................................................................. 22

5.2 Program Menu ........................................................................................................ 23

5.2.1 Surveying ........................................................................................................... 24

5.2.1.1 Set a Job ..................................................................................................... 24

5.2.1.2 Set the Station ............................................................................................. 25

5.2.1.3 Set the Orientation ...................................................................................... 25

5.2.1.4 Start Survey ................................................................................................ 26

5.2.2 Stake out ........................................................................................................... 27

5.2.2.1 Set a Job ..................................................................................................... 27

5.2.2.2 Set the Station ............................................................................................. 27

5.2.2.3 Set the Orientation ...................................................................................... 27

5.2.2.4 Start Staking out .......................................................................................... 28

5.2.3 Free Station ....................................................................................................... 31

5.2.3.1 Set a Job ..................................................................................................... 32

5.2.3.2 Set Accuracy Limit ...................................................................................... 32

5.2.3.3 Start Free Station ........................................................................................ 33

5.2.4 COGO ................................................................................................................ 34

5.2.4.1 Set a Job ..................................................................................................... 35

5.2.4.2 Set the Station ............................................................................................. 35

5.2.4.3 Set the Orientation ...................................................................................... 35

5.2.4.4 Start COGO ................................................................................................. 35

5.2.4.4.1 Set Inverse or Traverse Computation ................................................... 35

5.2.4.4.1.1 Set Inverse Computation ................................................................ 36

5.2.4.4.1.2 Set Traverse Computation ............................................................. 37

5.2.4.4.2 Set Intersections ................................................................................... 38

5.2.4.4.2.1 Set Bearing-bearing ....................................................................... 38

5.2.4.4.2.2 Set Bearing-distance ...................................................................... 39

5.2.4.4.2.3 Set Distance-distance .................................................................... 40

5.2.4.4.2.4 Set Four Points .............................................................................. 41

5.2.4.4.3 Set Offset .............................................................................................. 42

5.2.4.4.3.1 Set Distance-offset ......................................................................... 42

5.2.4.4.3.2 Set Point by .................................................................................... 43

5.2.4.4.4 Set Extension ....................................................................................... 44

5.2.5 Tie Distance ....................................................................................................... 45

5.2.5.1 Set a Job ..................................................................................................... 46

5.2.5.2 Set the Station ............................................................................................. 46

5.2.5.3 Set the Orientation ...................................................................................... 46

Содержание E3L

Страница 1: ...Shanghai eSurvey GNSS Co Ltd 1st Edition V1 1 E3L USER GUIDE TOTAL STATION...

Страница 2: ......

Страница 3: ...cument are the property of their respective holders Notice The purchased products services and features are stipulated by the contract made between eSurvey and the customer All or part of the products...

Страница 4: ...SHANGHAI ESURVEY GNSS CO LTD...

Страница 5: ...6 1 Replace and Mount the Battery 8 2 6 2 Recharge the Battery 8 3 Quick Start 9 3 1 Set up the Instrument 10 3 2 Center with the Laser Plummet 10 3 3 Do Levelling up 11 3 3 1 Do Basic Levelling up 11...

Страница 6: ...a Job 32 5 2 3 2 Set Accuracy Limit 32 5 2 3 3 Start Free Station 33 5 2 4 COGO 34 5 2 4 1 Set a Job 35 5 2 4 2 Set the Station 35 5 2 4 3 Set the Orientation 35 5 2 4 4 Start COGO 35 5 2 4 4 1 Set In...

Страница 7: ...t EDM 59 5 2 9 3 Set the New Construction Site 59 5 2 9 4 Continue the Previous Site 60 5 2 10 Lead Measure 61 5 2 10 1 Set a Job 61 5 2 10 2 Start Lead Measurement 61 5 2 10 2 1 Set the Lead 62 5 2 1...

Страница 8: ...ndex 88 5 6 3 View Adjustment Value 90 5 6 4 Tilt Offset 90 5 7 Com Menu 92 5 8 Download Menu 93 5 9 Start Menu 94 5 10 Info Menu 95 6 Maintenance 96 6 1 Cleaning and Drying 96 6 2 Storage 96 6 3 Tran...

Страница 9: ...GNSS CO LTD V 8 Appendix 102 8 1 Atmospheric Correction Formula and Chart Just for reference 102 8 2 Correction for Refraction and Earth Curvature 103 8 3 Assembling and Disassembling for the Three j...

Страница 10: ...SHANGHAI ESURVEY GNSS CO LTD VI...

Страница 11: ...age may occur Please do not cover the charger when charging Otherwise fire may occur Please do not use wet battery or charger defective power cable socket or plug and power cable and battery not speci...

Страница 12: ...sibility You are expected to follow all operating instructions and regularly check the performance of this instrument The manufacturer assumes no responsibility for any damage and loss of profits caus...

Страница 13: ...innovative technology and simple operations make the daily surveying jobs easier Undoubtedly it is ideally suited for simple construction surveys and stake out tasks 2 1 Overview Each part of E3L is...

Страница 14: ...several pages Menu key To access to 9 main menu See 5 Menu Key for details Enter key To confirm an entry or selection Navigation keys To control the focus bar within the screen and the entry bar with...

Страница 15: ...e and angle measurements and save measured values DIST To start distance and angle measurements without saving measured values REC To save the currently displayed values ENT To confirm an entry or sel...

Страница 16: ...l storage mode External storage mode The instrument is connected to the Bluetooth When the symbol does not show the instrument is communicated by RS232 serial port I II When Face I Definition is set t...

Страница 17: ...To input numbers and letters at the same time continuously press the Alphanumeric key several times Example Press number 7 several times to toggle through 7 A B C 7 A 2 6 Battery About the battery pl...

Страница 18: ...l months should be recharged for at least 10 hours to attain best status The status of the battery charging Red light is always on in charging Green light is always on charging is completed At this ti...

Страница 19: ...ESURVEY GNSS CO LTD 9 3 Quick Start The process of quick start is as follows Note When the instrument is working it is normal if you hear the noise from instrument motor it will not affect the instrum...

Страница 20: ...tripod head do the following a Carefully mount the instrument on the tripod head b Supporting it with one hand tighten the centering screw on the bottom of the unit to make sure it is secured to the t...

Страница 21: ...the circular level To do basic levelling up with the circular level do the following 1 Move screws A and B in the opposite direction until the circular bubble is perpendicular to a line shaped with sc...

Страница 22: ...steps until the bubble remains in the center of the tubular level while the instrument is rotated to any position 3 3 2 2 Do Accurate Levelling up with the Electronic Level on the Screen It is conveni...

Страница 23: ...AI ESURVEY GNSS CO LTD 13 3 4 Set EDM See 5 4 EDM Menu for details 3 5 Start Measurement After switching on and setting up correctly E3L is immediately ready for measurement See 5 2 1 Surveying for de...

Страница 24: ...can be assigned to USER key 4 1 Level Plummet It is used to trigger the electronic bubble and enable the settings of intensity for the laser plummet See 3 2 Center with the Laser Plummet for details...

Страница 25: ...the offset function is started The corrected angle and distance are displayed once a valid distance measurement has been triggered 4 3 Target Set It is used to switch among the following prism types...

Страница 26: ...shows 2 Press F4 YES 4 5 Height Transfer It is used to determine the height of the instrument by measurements five known points at most in two faces The principle is as follows To determine the height...

Страница 27: ...ement press F1 ALL 6 Optional To measure the same target in the second face press F2 FACEII 7 To save the changes and set the station press F4 ENT 4 6 Hidden Point It is used to measure a point that i...

Страница 28: ...rism Const to show the prism constant o Rod Length to set the total length of hidden point rod o Dist R1 R2 to set the space between the centers of reflector R1 and prism R2 o Meas Tol to limit the di...

Страница 29: ...step 2 4 to measure a hidden point again 4 7 Free Coding It is used to select a code from the code list or input a new code To start free coding do the following 1 To select Free Coding and enter CODE...

Страница 30: ...roximately 1s 4 9 Check Tie It is used to calculate and check the slope distance horizontal distance height difference azimuth grade and coordinate differences between the last two measured points The...

Страница 31: ...2 The display shows Take Measure Switched On Take Measure Switched Off for approximately 1s 4 12 Light On Off It is used to turn on or off the display illumination To turn on off the light press Fn an...

Страница 32: ...SHANGHAI ESURVEY GNSS CO LTD 22 5 Menu Key 5 1 Overview With MENU key you enter the following menu pages You can enter menu pages by press MENU...

Страница 33: ...2 Program Menu This menu contains programs that precede the application programs and is used to set up and organize data collection With this menu you can achieve the following You can enter all progr...

Страница 34: ...codes stations etc and can be individually manageable and readout edited or deleted Thus setting a job to save all recorded data is required before your work Note If no job is defined before an appli...

Страница 35: ...cally returns to SET STATION display iv Set the height of the instrument after input box Hi v Press F4 ENT The display shows Data Saved o Set the station by reading from the internal memory i To selec...

Страница 36: ...display press F2 2 ii Do one of the following Press F1 LIST and select a point stored in the internal memory Press F2 ENH set the backsight point and coordinates of north east and H and press F4 ENT i...

Страница 37: ...2 2 Stake out This program is used to calculate the required elements of staking out based on the coordinates manually input angles horizontal distances and heights of staking out points To set stakin...

Страница 38: ...lculation of the stake out elements select the target point and press F2 DIST o To input direction and Hz distance of the point to stake out press twice and F1 B D o To enable simplified input of a po...

Страница 39: ...HANGHAI ESURVEY GNSS CO LTD 29 The result of staking out is as follows there are three displays of the result and you can switch the display by pressing PAGE Polar Stake out The principle is as follow...

Страница 40: ...SHANGHAI ESURVEY GNSS CO LTD 30 Orthogonal Stake out The principle is as follows...

Страница 41: ...URVEY GNSS CO LTD 31 Cartesian Stake out The principle is as follows 5 2 3 Free Station This program is used to determine the instrument position from measurements of 2 5 known points The principle is...

Страница 42: ...Limit c Start Free Station 5 2 3 1 Set a Job See 5 2 1 1 Set a Job for details 5 2 3 2 Set Accuracy Limit It is used to define a limit for the standard deviation values If the calculated deviation exc...

Страница 43: ...t of the name of the station and the height of the instrument and press F4 ENT for confirmation 3 Do one of the following and press F3 ENT for confirmation o To find a known point press F1 FIND F2 LIS...

Страница 44: ...ALL to trigger angle and distance measurements 6 Press F4 ENT for confirmation If you need to start measurement again press F1 PREV 7 Optional To add more points repeat step 1 6 8 Press F1 COMPUTE The...

Страница 45: ...details 5 2 4 2 Set the Station See 5 2 1 2 Set the Station for details 5 2 4 3 Set the Orientation See 5 2 1 3 Set the Orientation for details 5 2 4 4 Start COGO To start COGO do the following 1 In...

Страница 46: ...ation is as follows To set inverse computation do the following 1 To select Inverse press F1 1 in COGO display and press F1 1 2 Input data and press F2 CALC for computing INVERSE RESULT display shows...

Страница 47: ...erse computation do the following 1 To select Traverse press F1 1 in COGO display and press F2 2 2 Input data and press F2 CALC for computing TRAVERSE RESULT display shows 3 Input a name for the new p...

Страница 48: ...COGO display press F2 2 INTERSECTIONS display shows 2 Do one of the following o Set Bearing bearing o Set Bearing distance o Set Distance distance o Set Four Points 5 2 4 4 2 1 Set Bearing bearing The...

Страница 49: ...point and press F4 REC for record The display shows Data Saved and automatically returns to BEARING BEARING display 5 2 4 4 2 2 Set Bearing distance The principle is as follows To set bearing distanc...

Страница 50: ...splay 5 2 4 4 2 3 Set Distance distance The principle is as follows To set distance distance do the following 1 In INTERSECTIONS display press F3 3 2 Input data and press F2 CALC for computing DISTANC...

Страница 51: ...o set four points do the following 1 In INTERSECTIONS display press F4 4 2 Input data and press F2 CALC for computing DISTANCE DISTANCE display shows 3 Input a name for the new point and press F4 REC...

Страница 52: ...lowing 1 In COGO display press F3 3 OFFSET display shows 2 Do one of the following o Set Distance offset o Set Point by 5 2 4 4 3 1 Set Distance offset The principle is as follows To set distance offs...

Страница 53: ...T display shows 3 Input a name for the new point and press F4 REC for record The display shows Data Saved and automatically returns to DISTANCE OFFSET display 5 2 4 4 3 2 Set Point by The principle is...

Страница 54: ...a name for the new point and press F4 REC for record The display shows Data Saved and automatically returns to SET POINT BY display 5 2 4 4 4 Set Extension The principle is as follows To set extension...

Страница 55: ...a Saved and automatically returns to EXTENSION display 5 2 5 Tie Distance This program is used to calculate the slant distance horizontal distance height difference and azimuth of two target points me...

Страница 56: ...done it before you can skip it b Set the Station If you have done it before you can skip it c Set the Orientation If you have done it before you can skip it d Start Tie Distance 5 2 5 1 Set a Job See...

Страница 57: ...The display shows Data Saved 4 To determine the second point press F1 ALL The display shows Data Saved and TIE DISTANCE RESULT display shows taking polygonal method as an example o Gradient the grade...

Страница 58: ...adial method To determine a new centre point press F1 CentPt At this time the result is based on the previous radial point and the new centre point To determine a new radial point press F2 RadPt At th...

Страница 59: ...TD 49 The calculated area is projected onto the horizontal plane 2D or projected onto the sloped reference plane defined by 3 points 3D Furthermore a volume with constant height can be calculated with...

Страница 60: ...one it before you can skip it b Set the Station If you have done it before you can skip it c Set the Orientation If you have done it before you can skip it d Start Area and Volume 5 2 6 1 Set a Job Se...

Страница 61: ...ted 3 Optional To undo measurement or selection of the last point press F2 DecPt 4 To check the result press F3 COMPUTE AREA 2D VOLUME MEASURE R display shows 5 2 7 Remote Height This program is used...

Страница 62: ...Station If you have done it before you can skip it c Set the Orientation If you have done it before you can skip it d Start Remote Height 5 2 7 1 Set a Job See 5 2 1 1 Set a Job for details 5 2 7 2 S...

Страница 63: ...ess F4 or 8 o it indicates that settings are done o it indicates that settings are not done 3 Do the following a Set a Job If you have done it before you can skip it b Set the Station If you have done...

Страница 64: ...f the following o To Set Reference Line press F2 1 o To Set Reference Arc press F3 2 5 2 8 4 1 Set Reference Line To set reference line do the following 1 To select REFLINE in REFERENCE LINE ARC displ...

Страница 65: ...FSET MEASURE display 5 In REFERENCE LINE MAIN display press F3 STAKE 6 Input data for orthogonal staking out including PtID reflector height longitudinal offset transversal offset and height 7 Press F...

Страница 66: ...the following REFERENCE ARC display shows o To select CP and SP press F1 1 o To select SP EP radius press F2 2 3 To measure the center point start point press F1 ALL to trigger measurement The displa...

Страница 67: ...NSS CO LTD 57 5 In REFERENCE ARC MAIN display press F4 STAKE 6 Do staking out a Select a method to stake out To select Stake Out Point press F1 1 To select Stake Out Arc press F2 2 To select Stake Out...

Страница 68: ...igger measurement d Optional To start staking out for the next point press F3 AddPt and repeat step 2 3 7 To measure the start point end point press F1 ALL to trigger measurement in REFERENCE ARC MAIN...

Страница 69: ...o it indicates that settings are done o it indicates that settings are not done 3 Do the following a Set a Job If you have done it before you can skip it b Set EDM c Set the New Construction Site d Co...

Страница 70: ...itive it means that the target point is further away than the measured point o d Off if it is positive it means that the target point is on the right of the measured point o dH if it is positive it me...

Страница 71: ...third page and press F2 or 01 o it indicates that settings are done o it indicates that settings are not done 3 Do the following a Set a Job If you have done it before you can skip it b Start Lead Me...

Страница 72: ...second page and set the following o First Stn the first survey station o Lead Bs Pt the lead backsight point o Start Brg the initial azimuth 4 Press PAGE F4 SET to go to the third page and set the fol...

Страница 73: ...of the instrument Note This value is defaulted to 0 Please input an accurate value before next step Otherwise the buzzer sounds and the proceeding operation is impossible o BsPt the backsight point o...

Страница 74: ...10 2 4 Calculate the Lead Before calculating the lead make sure all station surveys are complete To calculate the lead do the following 1 In LEAD MEASURE display press F4 4 The following display show...

Страница 75: ...It is used to send data to your PC To transfer data do the following 1 In LEAD MEASURE display press PAGE to go to the second page and press F2 6 The following display shows 2 Select the target lead a...

Страница 76: ...skip it d Start 2D Road 5 2 11 1 Set a Job See 5 2 1 1 Set a Job for details 5 2 11 2 Set the Station See 5 2 1 2 Set the Station for details 5 2 11 3 Set the Orientation See 5 2 1 3 Set the Orientat...

Страница 77: ...oint Point here means reference point control point including each grade of the known plane point and known elevation point that can be used for setting station and orientation To set a reference poin...

Страница 78: ...int should be on the straight line segment of the road centre line When using main point method please do not miss out any main point finally It s recommended to input data successively according to m...

Страница 79: ...be input as 2224 224 o LineType the line type of route preceding main point big stake mark direction including line circle round curve spiral easement curve and end point o Radius the radius of curvat...

Страница 80: ...the ordinate of the intersection point o East the abscissa of the intersection point o Turn the turn angle of an intersection point relative to the route Turn angles of start point and end point shou...

Страница 81: ...aking out To set road staking out do the following 1 To enter ROAD STAKE OUT display in ROAD MENU display press F2 2 2 Do one of the following o To select Peg Stake Out press F1 1 o To select Transect...

Страница 82: ...edited and modified To view data do the following 1 To enter ROAD DATA VIEW display in ROAD MENU display press F3 3 2 Do one of the following o To select Peg Data View press F1 1 o To select Transect...

Страница 83: ...play in ROAD MENU display press F4 4 o Transfer Type Upload to upload data to total station via PC It is only appropriate for known data control point and plane alignment Download to send data to PC v...

Страница 84: ...TD 74 5 3 Setting Menu With this menu you can achieve the following You can set the following in SETS menu page by pressing MENU and F2 SETS 2 Contrast It is used to adjust the display contrast You ca...

Страница 85: ...ntal 0 o V 45 100 Horizontal 0 Tilt Correction o Off to disable the compensator o 2 axis to make compensation for two axes o 1 axis to make compensation for a single axis You can also set it by Star k...

Страница 86: ...permanently This drains the batteries quickly Min Reading It is used to set the minimum reading of the angle o Angle unit DMS DEGREE MINUTE SECOND 0 00 01 0 00 05 0 00 10 o Angle unit GON 0 0005 gon 0...

Страница 87: ...For this purpose a data storage device must be connected Coordinate Format o NEH o ENH 5 4 EDM Menu With this menu you can achieve the following 5 4 1 Common Parameters You can set common parameters...

Страница 88: ...of sight The light points are visible up to a distance of 150 meters 5 4 2 Atmospheric Parameters Atmospheric parameters are used to correct the influences in distance measuring caused by the atmosphe...

Страница 89: ...NS display Scale Factor the scale of projection Measured values and coordinates are corrected with the PPM parameter Range 0 50 1 999999 Scale PPM it automatically changes with the value of Scale Fact...

Страница 90: ...ments codes results etc Each job consists of job name operator note 1 and note 2 You can view and delete created jobs and create a new job You can enter VIEW JOB display by pressing MENU and F4 JOB 4...

Страница 91: ...an input the exact PtID or use wildcard criteria Delete the selected fixed point by pressing F2 DELETE Add a new fixed point by pressing F3 ADD Edit the known data by pressing F4 EDIT 5 5 3 Measuremen...

Страница 92: ...the selected code by pressing F4 DELETE 5 5 5 Initialize Memory It is used to delete all data or the selected data job measure or known point for memory releasing according to the selected data type...

Страница 93: ...Known Point the number of stored known points Measure Data the number of recorded data blocks measured points codes etc Spare Job the number of free or not defined jobs 5 5 7 Memory Selection It is us...

Страница 94: ...owing display shows 5 5 9 File Copy You can enter MSD Copy to SD display by pressing MENU and F4 JOB 4 and pressing PAGE to go to the third page and pressing F1 9 in FILE MANAGEMENT display 5 5 10 DAT...

Страница 95: ...the sight line of the telescope is not perpendicular to the horizontal axis the collimation error will appear Besides the assembling transportation and operation will also cause this error The whole p...

Страница 96: ...F1 1 in CHECK ADJUST display 2 To get the face left angle reading F1 aim at the cross hairs of collimator or the obvious target at a distance at telescope left and press F3 ENT 3 To get the face righ...

Страница 97: ...ate the instrument at telescope right and turn the horizontal tangent screw until F2 F2 C ii Loosen the shield of the reticle of the telescope iii Do the following to adjust the screws of reticle unti...

Страница 98: ...and compensator zero position it is necessary to check and adjust compensator zero position when adjusting the vertical circle to keep the value stable when reading The whole process is as follows Bef...

Страница 99: ...e cross hairs of collimator or the obvious target at a distance at telescope right and press F3 ENT The system automatically calculates the new error 4 Press F3 YES to view calibration data 5 Judge if...

Страница 100: ...ent value do the following 1 To select View Adjustment Value Press MENU press PAGE to go to the second page press F1 ADJ 5 and press F3 3 in CHECK ADJUST display 2 Check the value of horizontal collim...

Страница 101: ...lay 2 To get the face left angle reading F1 aim at the cross hairs of collimator or the obvious target at a distance at telescope left and press F3 ENT 3 To get the face right angle reading F2 aim at...

Страница 102: ...page and pressing F2 COM 6 Baudrate o Data transfer speed 1200 2400 4800 9600 19200 TOPCON SOKKIA o Unit bits second Databits o 7 data transfer is realized with 7 databits It is automatically set if P...

Страница 103: ...erface to a receiver e g a laptop With this menu you can achieve the following To transfer data do the following 1 To enter DATA TRANSFER display press MENU press PAGE to go to the second page and pre...

Страница 104: ...To set the start up sequence do the following 1 To enter START UP SEQUENCE display press MENU press PAGE to go to the second page and press F4 START 8 2 Select the status 3 To give the definition tha...

Страница 105: ...system information do the following 1 To enter SYSTEM INFO display press MENU press PAGE to go to the third page and press F1 INFO 9 2 Check the remaining battery power and measured instrument temper...

Страница 106: ...dry 6 2 Storage About storage please note the following When the instrument is stored for a long term please take it out from case in order to allow the air to circulate and avoid lens s mildew Storag...

Страница 107: ...d to measure the instrument height and the prism height when detection is performed on uneven ground 1 Select two points A and B on the flat ground that are about 100m away from each other respectivel...

Страница 108: ...he bubble gets stable make fine adjustment of the screws by using a calibration pin driving the bubble to move half distance toward the center of the tubular level 6 Repeat step 3 5 until the bubble c...

Страница 109: ...ection for the laser centering device do the following 1 Set the instrument on a tripod and fix it 2 Put a cross mark target directly below the instrument 3 Turn the three foot screws on the instrumen...

Страница 110: ...ne of the reticle is not perpendicular to the horizontal axis of the telescope correction is required because one point on the vertical line may be used to collimate the target for horizontal angle me...

Страница 111: ...ffset for details 7 10 Optical Axis and Telescope Sighting Axis for Distance Measurement It is used to check optical axes of the rangefinder and theodolite for consistency Before doing checking and co...

Страница 112: ...actory setting temperature 20 pressure 1013 hpa 0 ppm Correction Kpt 274 417 0 2904 p 1 0 0036 t Where Kpt atmospheric correction ppm p pressure value hPa t temperature value Example If t 20 p 1013hpa...

Страница 113: ...ance measurement the formula for slope distance horizontal distance and vertical distance applied in the instrument are as followings SD Do 1 ppm 10 6 mm o SD displayed slope distance m o Do real meas...

Страница 114: ...the tribrach clamp anticlockwise until the lever is loosened 2 One hand hold up the tribrach another hand hold the handle of the instrument and lift out the instrument from the tribrach Assemble 1 Li...

Страница 115: ......

Страница 116: ...hai China E mail Sales info esurvey gnss com Support support esurvey gnss com Hote line 86 21 54467213 Website https esurvey gnss com Shanghai eSurvey GNSS Co Ltd To be the leading provider of high pr...

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