Measurement Settings Suggestions
- Thread starter Sean Joyce
- Start date
Jim, that chart lists the DOP (dilution of precision) values on the left and the time at 30 minute intervals along the bottom.
Thanks Dave, I will be using this site.
Ron Booher
Member
Today I had a webinar about SPC in surveying, the Professor said we should be surveying in grid coordinates not ground. This is different than I was told, any comments? He did say to note on plan or deed lengths are SPC.
Nate The Surveyor
Well-Known Member
Well, first off, there is a bit of truth in what he is saying.... It is very difficult to use PURE and ABSOLUTE ground coordinates.
On the other hand, what we call "Ground" is usually (there are exceptions) quasi or average ground coordinates.
That is, we take an average of our project, and make a combined scale factor, (Like +110PPM) and call that ground.
Since that is a common mechanism, then the next issue that comes up, is WHERE the coordinates are going to get scaled.
PERSONALLY, I like them scaled in the LS. OTHERS do it in the Surveying software, such as Carlson.
I usually set page 0 to real grid coordinates.
And, page one, is my local ground, often named "Evans @ 96 PPM"
This way, I can "Pretend" that it is all ground. And, IF I have a SPC coord, that I need, I can make Page 0 active, and key in a SPC coord.
At the end of my project, (After going back and forth 5 times, Coords in, coords out, etc) I can archive pure SPC.
So, in the end, I have both, and I don't have to monkey with it as much.
That's just my flow chart. I think it is simpler. This way, I can also take my line work into the LS, on the same scale as the drawing.
WHERE they get scaled, is not a primary concern. What is a primary concern, is that you know what you are doing, and that you can go back and forth, fluently.
I have dreamed of a office suite, that labels the lines, and does all the descriptions, with a scale factor. And, can annotate rotated. So that you can set a job on pure SPC, underlying. And the final product simply comes out on ground, with any basis of bearing you like. But, that is another subject.
Nate
On the other hand, what we call "Ground" is usually (there are exceptions) quasi or average ground coordinates.
That is, we take an average of our project, and make a combined scale factor, (Like +110PPM) and call that ground.
Since that is a common mechanism, then the next issue that comes up, is WHERE the coordinates are going to get scaled.
PERSONALLY, I like them scaled in the LS. OTHERS do it in the Surveying software, such as Carlson.
I usually set page 0 to real grid coordinates.
And, page one, is my local ground, often named "Evans @ 96 PPM"
This way, I can "Pretend" that it is all ground. And, IF I have a SPC coord, that I need, I can make Page 0 active, and key in a SPC coord.
At the end of my project, (After going back and forth 5 times, Coords in, coords out, etc) I can archive pure SPC.
So, in the end, I have both, and I don't have to monkey with it as much.
That's just my flow chart. I think it is simpler. This way, I can also take my line work into the LS, on the same scale as the drawing.
WHERE they get scaled, is not a primary concern. What is a primary concern, is that you know what you are doing, and that you can go back and forth, fluently.
I have dreamed of a office suite, that labels the lines, and does all the descriptions, with a scale factor. And, can annotate rotated. So that you can set a job on pure SPC, underlying. And the final product simply comes out on ground, with any basis of bearing you like. But, that is another subject.
Nate
Sean Joyce
Well-Known Member
Here is the mission planning site that I have been using (a competitor).
http://www.spectraprecision.com/eng/support/gnss-planning.html
Has some great user friendly features. I especially like the ease of picking the location and the time slider.
Someday I hope Javad finds a way to incorporate similar mission planning into the L.S. (with an internet connection of course)
to at least give us a general idea of what we can expect while we are on a point,
terrain and vegetation restrictions aside.
http://www.spectraprecision.com/eng/support/gnss-planning.html
Has some great user friendly features. I especially like the ease of picking the location and the time slider.
Someday I hope Javad finds a way to incorporate similar mission planning into the L.S. (with an internet connection of course)
to at least give us a general idea of what we can expect while we are on a point,
terrain and vegetation restrictions aside.
With full GPS and GLONASS constellations I don't really think mission planning is that useful anymore as the number of visible satellites remains fairly consistent throughout the day.
I am guilty, I hardly ever look at any sort of mission planning, but I would if it were readily available and was having trouble. Still, I don't put a lot of effort into it, Matt's right, and it seems i never have to wait more then 10 15 minutes to be able to get data where I couldn't before.
Sean Joyce
Well-Known Member
Unless one works in flat country all the time like I don't, mission planning is a useful tool.
If I know I am going to a difficult spot I plan to try and be there at an optimum time for that situation.
If I know I am going to a difficult spot I plan to try and be there at an optimum time for that situation.
