I find the following formula easier to follow: (Highest Level - Contour Level)/(Highest Level - Lowest Level) x Grid Line Length = Distance From Highest Grid Point. E.g. for your first contour: (.800 - .500) / (.800 - .100) x 10 = 4.28mm - In other words CL .500 is 4.28mm from the highest RL (.800). Also, thanks very much for making this series of videos. I hope that you are getting some sort of royalties from all of the Tafe colleges using them in their courses.
Hi Sam, thanks for sharing that formula, I'm sure others will find it a useful alternative to mine. Yes i get plenty of views form TAFE and other RTO which all helps.
from my calculations, this formula doesn't seem to work with whole numbers. For instance, lets say we have Point 1 = 25 and Point 2 = 20. Following the formula i have this: A 25.00 - 20.00 = 5 B Distance between points (10,000) / 5 = 20 C 20 - (contours spacing 1) = 19.00 D 19 x 20 = 380 This doesn't make any sense to me. Over 10metres, the spacing should be 2000mm, not sure what this 380mm is? Are you able to shed any light on this please? Thanks, great video too by the way.
Hi Andrew I think where you are getting confused is with the distance between points. This should be the distance on the grid you are plotting it on, on the paper, in millimetres. The answer that you get is the number of millimetres from the 1rl to where the contour line will cross the grid.
Hi Sherah, this is a generic comment that I make on all my videos. As i am based in Australia I work with the Australian Standards (AS) and the Australian National Construction Codes (NCC) although there aren't any standard that apply directaly to this video.
Hi Mate, what you need to do is look for the points that the contour line would pass between. So look for R.L's that are higher and lower than the required contour then just do the calculation using those figures. Hope this helps
thanks man I also went back and fourth on the video and also found a solution to my question resulting in the contour interval that you have chosen which was 0.500mm and may i ask why have you chosen 0.500mm and not 1.000m for example?
thank you sir, but really confused if it is 10mm or 10m and 0.100mm or 0.100m......you say 100 mils which is after the decimal and when I see the figure it is 10 to 0.100....is that correct or m just confused please let me know......other wise really thank you for putting such an effort
Hi Ravi when I say "mil" I mean millimetres however because we then have to work out a factor which gives us a height per millimetre the whole decimal system gets thrown into chaos. So the final answer is millimetres even though it is showing in metres in SketchUp. Hope this helps, thanks for your comments
+Handsome Darwin Hi Handsome You are correct Contour lines can not split. Yes you can have 2 or more lines on the same point this would represent a clif on the ground. Hope this helps
Hi, trying to work this out. Lets just say your contour line that will run though 1.940 and 2.200. With the working out you provide the answer is 55.391
Hi Rinaldo, Assuming that you are looking for the 2.000 contour line and that the grid spacing on your grid is 10mm like my example then I get 2.308. My working is in this spreadsheet which you can use as well docs.google.com/spreadsheets/d/1zgTRqYCnFbcF4KNWhDpIK70MapmSfDwbp72QyAoI114/edit?usp=sharing Remember when I say grid Line length that is the length of the grid lines on the paper you plotting the contour lines on not the spacing of the grid for the original survey.
How come there are no contour lines in some grids? Like 1.380 to 1.100 and 1.170 to 1.090? I'm trying to wrap my ahead around this stuff but just can't seem to get it...
Chloe Absalom Hi Chloe The contour interval for this example is 0.500m, shown at 0.500, 1.000, 1.500 etc so they are only shown where there is a 500mm difference in height. In some areas of this block of land the slope is very flat so the height doesn't rise that much. Remember contour lines connect points of equal height. So everywhere along that line is the same height If you haven't seen these videos they might help Contour Lines Develop a section from Contour Lines
Hi Jay This is the link to the current free version of Sketchup www.sketchup.com/plans-and-pricing/sketchup-free there are also links to more information on Sketch Up products
Hi Mate, i guess i meant to say that the line is done freehand and that between the given points it is up to you to estimate the likely direction that it will take. Hope this helps
I find the following formula easier to follow: (Highest Level - Contour Level)/(Highest Level - Lowest Level) x Grid Line Length = Distance From Highest Grid Point. E.g. for your first contour: (.800 - .500) / (.800 - .100) x 10 = 4.28mm - In other words CL .500 is 4.28mm from the highest RL (.800).
Also, thanks very much for making this series of videos. I hope that you are getting some sort of royalties from all of the Tafe colleges using them in their courses.
Hi Sam, thanks for sharing that formula, I'm sure others will find it a useful alternative to mine.
Yes i get plenty of views form TAFE and other RTO which all helps.
Sam Taylor which software is that?
from my calculations, this formula doesn't seem to work with whole numbers. For instance, lets say we have Point 1 = 25 and Point 2 = 20.
Following the formula i have this:
A 25.00 - 20.00 = 5
B Distance between points (10,000) / 5 = 20
C 20 - (contours spacing 1) = 19.00
D 19 x 20 = 380
This doesn't make any sense to me. Over 10metres, the spacing should be 2000mm, not sure what this 380mm is? Are you able to shed any light on this please?
Thanks, great video too by the way.
Hi Andrew
I think where you are getting confused is with the distance between points. This should be the distance on the grid you are plotting it on, on the paper, in millimetres.
The answer that you get is the number of millimetres from the 1rl to where the contour line will cross the grid.
Hello what standards are you talking about when you means 7:13 we keep up to date with the current standards.
Hi Sherah, this is a generic comment that I make on all my videos. As i am based in Australia I work with the Australian Standards (AS) and the Australian National Construction Codes (NCC) although there aren't any standard that apply directaly to this video.
Hey man im just a bit confused how do I determine which points / Intersections to use as 1st and 2nd RL's ??
Hi Mate, what you need to do is look for the points that the contour line would pass between. So look for R.L's that are higher and lower than the required contour then just do the calculation using those figures.
Hope this helps
thanks man I also went back and fourth on the video and also found a solution to my question resulting in the contour interval that you have chosen which was 0.500mm and may i ask why have you chosen 0.500mm and not 1.000m for example?
HI Mate, no reason, in particular, 0.500m is just more common and more detailed I guess.
Great video other than that mate def subscribed
Thank Mate
Sir which software you used for drawing contours
(for flat terrain)
Hi Mate, I use Google SketchUp for all my drawings.
@@Buildsum please make a tutorial on how to make 2D contour using google sketch.
thank you sir, but really confused if it is 10mm or 10m and 0.100mm or 0.100m......you say 100 mils which is after the decimal and when I see the figure it is 10 to 0.100....is that correct or m just confused please let me know......other wise really thank you for putting such an effort
Hi Ravi
when I say "mil" I mean millimetres however because we then have to work out a factor which gives us a height per millimetre the whole decimal system gets thrown into chaos. So the final answer is millimetres even though it is showing in metres in SketchUp.
Hope this helps, thanks for your comments
Great. Thanks for the video.
so the same intervals connect to each other to form a line?
Hi Zack
Yes you join all the point that are the same height to form your contour line
saved my ass at tafe for a test in my carpentry apprentice shop course
Thanks Mate that is good to know.
Contour lines cant split right? and also. is it possible to have 2 contour lines in 1 point?
+Handsome Darwin Hi Handsome You are correct Contour lines can not split. Yes you can have 2 or more lines on the same point this would represent a clif on the ground.
Hope this helps
okay thanks a lot! :)
Sir... Is these given RLs and contour RL in mm or in m?
Handsome Darwin no
Hi,
trying to work this out.
Lets just say your contour line that will run though 1.940 and 2.200. With the working out you provide the answer is 55.391
Hi Rinaldo, Assuming that you are looking for the 2.000 contour line and that the grid spacing on your grid is 10mm like my example then I get 2.308.
My working is in this spreadsheet which you can use as well
docs.google.com/spreadsheets/d/1zgTRqYCnFbcF4KNWhDpIK70MapmSfDwbp72QyAoI114/edit?usp=sharing
Remember when I say grid Line length that is the length of the grid lines on the paper you plotting the contour lines on not the spacing of the grid for the original survey.
Sir.... Are these given RLs and contour RL in mm or in metres.??
Hi Sabiha
Contour lines and R.Ls are measured in metres.
What does the RL stand for ?
How come there are no contour lines in some grids? Like 1.380 to 1.100 and 1.170 to 1.090? I'm trying to wrap my ahead around this stuff but just can't seem to get it...
Chloe Absalom Hi Chloe The contour interval for this example is 0.500m, shown at 0.500, 1.000, 1.500 etc so they are only shown where there is a 500mm difference in height. In some areas of this block of land the slope is very flat so the height doesn't rise that much.
Remember contour lines connect points of equal height. So everywhere along that line is the same height
If you haven't seen these videos they might help
Contour Lines
Develop a section from Contour Lines
Which software is this?
Hi Jay, I use SketchUp for all my drawings.
Buildsum can you please provide me the link from where I can download it?
Hi Jay
This is the link to the current free version of Sketchup
www.sketchup.com/plans-and-pricing/sketchup-free
there are also links to more information on Sketch Up products
Buildsum thanks a lot. Stay blessed
thankyou
thank you soo much
How to make the line artistic
Hi Mate, i guess i meant to say that the line is done freehand and that between the given points it is up to you to estimate the likely direction that it will take. Hope this helps
bro any one have know how to draw graph by grid contour mthod pls
Hi, Mate is this what you are talking about?
th-cam.com/users/edit?o=U&video_id=lecfQGPvF-I
Bhai hindi m explain kar