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Replies
This is a very interesting discussion for many reasons. Here are some of my observations:
1. Every mathematical model of geospatial relationships among and between objects in the model are not the true objects, themselves, but an approximation of the location of the objects in space and time.
2. The are no necessary "expected results"; only an interpretation of the factual evidence of the model, which may dangerously tend to become a future method of constraint in a model of interpretation for similarly categorized experiences.
3. "Similarly categorized" means the following: Cataloged in the human mind as belonging to the same set of circumatances.
4. A set of circumstances in and for creating a geospatial mathematical model are inherently unique; thus not a matter of duplication.
5. The only method of arriving at an acceptable solution to an unique problem will tend to involve creative and intuitive thought, and will likely become the topic of discussion among others facing an unique set of circumstances.
Scott D. Warner, R.L.S.
Senior Director / Editor
Land Surveyors United
Umm.......yes.
Robert
Hi Robert... In my opinion, If that activity is only for ASSESSMENT and requires only rough position/ Location, your Laser Tech Industries TP360B laser rangefinder is capable of triangulation or trilateration as mentioned by Paul above, your rangefinder can even provide you missing line.
However, if the survey will be used for Approval of Fixed Points, basically, boundary survey and demarcation shall be carried out by a qualified surveyor where for such big Area as I'm assuming, a Geodetic Survey is necessary. Also, In such case, shall refer to Land Surveying Rules and Regulations of that area or other laws or rules of the same purpose.
I hope you can pick a piece in my lines... Good luck...
Hello, I dont know if this will do the job for you. . but you can try to look for Mapsmart program that comes with the laser range finder. . I think its truepulse laser range finder. .
But Im not sure if you can do like 1000 meters. . as I understand its can do 800 meters. . and you can adjust and close your traverse. .
Hope this may help you. .
Thanks for the suggestion. I'm not familiar with Mapsmart. It didn't come with the Trupulse; I'm told by the importers that it's an extra-cost option.
As far as range is concerned, I find it's very dependent on target quality. A staffman in a white shirtt gives me 800 meters without trouble which is as much as I need for now.
thanks again
Robert
Well Im sorry, yes indeed its an extra cost to the range finder.
I dont really know if they have video of mapsmart.
you ca try to browse from the net.
here some of its capability;Field data collection and mapping software by LTI for the non-surveyor. Measure stockpile volume, distance, height, azimuth, position, area and elevation
Hello Robert,
I understand your position but am concerned with the accuracy you want to attain for your survey. Early geodetic surveys were constructed and supported by frameworks of triangles...
trilateration
Thanks Paul, That's a very valid point you make. And thanks for the helpful text. I omitted to explain the purpose to which I hope to apply traversing by distance.
I design and build refugee camps for UNHCR. Part of my work involves rapid assessment of sites as to suitablility. This has to be done with handheld instruments as the work environment does not permit tripods. I work alone and security considerations militate against anything that looks vaguely official or military related.
I have a Laser Tech Industries TP360B laser rangefinder that measures out past 1000m reflectorless. I need no more than +/- 1m for each shot so a misclosure of several metres will not bother me. The rangefinder also gives azimuth so I could use that and carry out a conventional traverse, though azimuth accuracy is only 15 minutes.
I'd like to have the option of using distance and azimuth or just distance. Is this possible?
Thanks again for your time
regards
Robert
Hello Robert, given the constraints, accuracy ability of your instruments and lack of necessary foundation for your instruments I believe that distance only is your best bet. Solve the triangles distance only. You could use azimuth as well but treat it as a separate survey.This may give you a relative check by comparing areas. Your in a tight spot, but you wouldn't have taken a job like that if you did not know what you were up against...I admire your courage...if you can get repeatability from different locations which will allow you to keep track of your error as you mentioned I think you can build a framework of triangles. You really need some way of maintaining the integrity of the point your shooting from... your starting monuments in which you build from have to be reliable. Targets with plum bobs suspended from lath may not present an obvious threat, natural (land marks)foresights and backsights may help....do you have utm maps of the area? Sorry I could not be of more help...will continue to ponder....Paul
Your device is already capable of this work. Store multiple observations from separate points and mean the resulting coordinates. Using a staff or monopod will enhance your accuracy.