How do you check for the current OS Version on a Carlson Surveyor 2 (or Mini-2)?
How do you check for the current OS Version on a Carlson Surveyor 2 (or Mini-2)?
Wow, there has been a lot of ink spilt on North Arrows and projection declarations for jobs based on GPS data.
Since I am not a licensed surveyor, my opinion does not count. But I get asked all the time. So here is an example of what I might do as a minimum:
I, Joe Blow, do hereby certify that I am a Professional Land Surveyor, holding certificate 99999 as prescribed by the State of Chaos. I further certify that I have prepared the diagram represented herein and that the same is an accurate representation of a survey, and was conducted under my direct supervision. Benchmark The Benchmark for this project is CP201 Coordinate System and Projection Information Horizontal Datum = NAD83, North American Datum 1983, 2011 Realization 2010.0 Epoch GPS Control = Maine DOT Virtual Reference System (VRS) Vertical Datum = NAD88, North American Vertical Datum of 1988, GPS Derived GEOID (used for GPS Derived Heights) = GEOID12B (NGS) Ellipsoid = GRS1980 Projection = Maine West NAD83 State Plane Coordinates Distance = US Survey Feet (1 Meter = 3937/1200 US Survey Feet) Distances Distances are Grid distances converted to Ground using a Combined Scale Factor The Combined Scale Factor (0.99996067) for this project was derived at Control Point 201 CP201 = 44 2 55.34000 N 69 58 23.05000 W NAD83 Ellipsoid Height 215.562 ft GEOID -57.100 ft Ortho Height 272.662 ft [NAVD88 (Computed using GEOID12B)] Example: 9,857.824 SFeet Grid = 9,858.206 SFeet Ground Bearings Bearings are with respect to State Plane Grid North Declination at TN-SP 0° 8’ 4.57” TN-MN 15° 36’ 37” (2017 Estimate)
Chaos PLS Number 99999
Let’s assume that we have an .RW5 (Raw File) for a job in one projection (a custom projection) and we want to reuse ‘SOME’ of the coordinates and GPS shots in this job, in a completely NEW job with an alternate projection.
Thesis: I have hundreds of control points and boundary shots for a job that were taken in a custom LDP. Now I want to work on an adjoining site, but in a new projection (or perhaps a standard State Plane Projection.)
If we assign the previous file as the control file of new job with a completely different projection, then we can import the RAW GPS positions to set a base, and we can use the raw data as the GPS coordinates for a localization.
Continue Reading > survce_reusingcoordintesbetweendifferentjobswithdifferentprojections_reva
The SP80 is billed as ‘the most connected receiver’ and without question, it is.
The internal Wi-Fi transmitter makes it possible to connect a SP80 directly to a Mi-Fi, which reduces the amount of data on the Bluetooth channel.
Let’s look at a comparison between the traditional ‘Data Collector Internet’ (DCI) configuration vs. the SP80 method [ … sp80-survce_wifi_connection … ]
There are two measure-up indices on a Spectra Precision Focus-30 / Focus-35 Robotic Total Station:
The lower tape hook is for ‘Slant Height’. The top dot & cross is for ‘Vertical Height’.
If you enter a ‘Slant Height’, the data collector shows you the equivalent ‘Vertical Height’:
(Sorry, the picture is faded…to the right of ‘Vertical’ there is a 5.1600) If I measure 4.650′ to the tape hook then SurvCE computes 5.160′ to optical center.
Alternatively I could select the ‘Vertical’ radio option and then enter 5.16 directly.
[ See Also ]
“Okay, I understand that I MUST set my base to a geodetic location that is within 200 meters of my base’s TRUE geodetic location X, Y and Z. But I still want to set the base at a known position and I don’t have a transformation. I swear I can do this in other software packages!”
You can do it in SurvCE also. Here is how.
First go to “Equip: 6 Localization: GPS (tab)”. Set the One Point Azimuth to ‘Geodetic’ or ‘State Plane Grid’ as desired. If you are going to use a system like 1000,1000,0 then you probably want to pick ‘Geodetic’. If you are going to use a state plane or modified state plane coordinate then you undoubtedly want to select ‘State Plane Grid’:
Also check to make sure that an appropriate Geoid File is specified. Even if you are in Latin America and have a crappy Geoid file, you STILL need to select it or your elevation error will increase as you move away from the base.
Click on the green check mark to return to the Equip tab.
Do the standard base configuration steps: “Equip: GPS Base: setup Current, COMS, Receiver and RTK tab normally”. Click the Green Checkmark in the upper right corner.
The ‘Base Configuration’ tab is shown. Select the “From Known Position” tab:
In my case I want to enter local coordinates 1000, 1000, 0; so I click on the center button ‘Use Local Coordinates’:
Enter your desired coordinates, then click on the green check mark. SurvCE will ask you what you want to use for the localization file. The default is the job name with a .LOC extension:
Accept or modify the filename, then click on the green check mark.
SurvCE will read an autonomous position from the base. (In the USA this position will be within a couple feet of the IGS08 current epoch true position; elsewhere it will be within 5 meters.)
Click on ‘Yes’ to continue.
The base will be configured and SurvCE will ask if you want to store a reference file:
Click on ‘Yes’
Choose an appropriate name and click on the green check mark.
Your base is now broadcasting corrections and if you could occupy the Base Point (under the base) with your rover, the rover would read ‘1000.00, 1000.00, 0.00’ as you desired.
You are ready to survey, but let’s spend a few extra minutes and address two things:
First off, SurvCE has done a ‘Read GPS’ and used the autonomous location to initialize the base. The base does not think that it is at 1000, 1000, 0; the base thinks it is at a position that is very close to it’s TRUE position:
SurvCE automatically sets up a single point localization. You can view it by going to “Equip: Localization: Points”:
Notice that the control point’s local coordinates are the point that I manually entered. Click on the ‘View’ button:
and the corresponding geodetic position is the autonomous (WAAS corrected) base point. This base point is also saved in the .REF file.
So to recap, SurvCE has initialized the base with a ‘Read GPS’ position and then automatically configured a single point localization that results in the base reading the exact local coordinates that I requested.
You want to use the .REF file to insure that the base is initialized with the exact same geodetic position that was used on the first day.
Setup the base over the EXACT same X-Y location as the first day. The HI does not need to match. Enter the correct HI on the ‘Receiver’ tab:
When you click on the green check mark, you will go to ‘Base Configuration’ dialog. Select the ‘From Known Position’ tab:
Click on the ‘Read From File’ button at the bottom:
Select the same reference file that you saved on the first day, then click the green check mark.
SurvCE will check to insure that the broadcast geodetic location is close to the actual location, then display the position read from the file:
Click on Yes:
And the base is reconfigured exactly as it was the first day. Since you are still using the original job file, the correct localization is automatically used. You are good to survey!
Then you must move the localization file (.LOC) onto each of the other rovers and load it with the load button in ‘Equip: Localization: Points (tab)’:
Then select the .LOC which you moved from the first rover data collector:
Again, the second rover is now ‘registered’ with the same localization and will follow the first rover’s coordinates exactly.
Often Carlson SurvCE robotic users are confused by a robot that is tracking the prism while the screen indicates that Tracking is turned off. Here is a screenshot showing tracking disabled:
You can see that I am “locked” and if I move the prism around, the gun will follow the prism and the AR and ZA on the bottom update continuously:
But the interface shows that tracking is disabled:
If you push this button, then the gun will switch to ‘Tracking’ mode and the icon will change to this:
Which is ‘Tracking’ ON and the EDM will start firing. And the difference is on the bottom line:
You now have a slope distance displayed, the gun is firing and making a tracking measurement.
So while we are talking about this, what is the difference between “R” (READ) and “S” (STORE)? Read does a full read, then a store: the gun checks position on the prism, does a couple of precision average shots and then stores the result.
Store just stores the last reading acquired through the tracking process. And there can be a significant difference.