Monday, January 7, 2013

How do I do takeoffs in Autodesk AutoCAD Civil 3D 2008?

Q. I am needing to perform takeoffs from a DWG file. There are no elevations assigned to the contour lines, it is 2D. Here, I will need to assign elevations to the contour lines. Afterwards, I will need to perform a volume calculation to determine the earth excavation and borrow quantities.

In addition, I am also needing to determine the area of sections of pavement that are getting varying thicknesses of material. Here, I will need to determine the area of the pavement AND apply a proposed surface offset to adjust the earthwork quantities in order to take these material thicknesses into account.

It would also be nice if I could determine the length of a line, which would be helpful in finding the length of items such as curb and gutter, silt fence, etc.

Any thoughts on this?

A. To find the length of the line simply highlight the line in question and view its properties, one of which is length. Or, use the "di" command to measure distance. As for the volumes, you have to first set up a surface. This is done using terrain model explorer in land desktop, and I believe civil 3D is similar. Judging by your questions you will need to have someone help you with creating surfaces. It would be much too complicated to explain here. Hope that gets you started.

How do you calculate cut and fill values by using cad programs.?
Q. I am using NETCAT program. and calculating the values by cross sections method but I want to learn another methods especially by autocad to control the values...
canip

A. I use AutoCAD Civil 3D and it's fairly simple. If you have two surfaces (for instance, one surface might be the existing ground surface of a particular plot of land and the other surface is a dam of a lake or something like that), you can get CAD to compute the volume of the dam. Basically CAD subtracts the existing ground surface from the dam surface and gives you the cubic yardage. It's a little more complicated to build the dam's surface, but once it's built, it's just a click of a button to get the fill value.

how can a geodetic engineering product help me as an accountant?
Q. my course is accountancy, but we have a professor in a general education course, a geodetic engineer, who gave us an assignment. he wants us to make a write-up about how a GE product could help us in our profession directly or indirectly.. i don't know much about GE and how it can be related to accountancy so i hope you can help me.. thanks..

A. A Geodetic Engineer works on things to do with the location of points on the earth's surface, and the gravity of the earth. This involves collecting data about the points on the earth's surface to define it, and constructing charts and other engineering studies from that, so may be used in surveying, hydrology etc. This is especially associated with Civil Engineering, and Mining and surveying. Consider dams, roads, railways, buildings, property locations, mining surveys, mines. Almost everything constructed on the land needs this sort of information. And of course it is related to maps. Survey reference or datum points (trig points) are used as references for measurements to points on the map, so that it becomes possible to locate points accurately from a map.

Somewhere in all of this is GPS (satellite) navigation. As the earth is not a truly round ball, there needs to be a correction for the true shape of the earth to define a position on the earth's surface (apart from the hills and valleys), and this is a geodetic model, presumably referring the measurements to mean sea level at that location. This allows the GPS position to be located on a map using the same geodetic model, and gives us a realistic altitude. Maps are 2D representations of the 3d earth's shape, so they also rely on particular geodetic models like WGS84 used in some parts of the world, and then are converted through a projection using a co-ordinate system..

The facebook page linked below has a long description that should clear up what Geodetic Engineering means. Look down to "Don In RA ". GIS is a Graphical Information System, a database, with attributes or information associated with geographical points. Once again, a GPS navigator has something along this line when you look for the nearest filling station, motel etc.

His key fields list is here..
1. Property Surveys
2. Construction Surveys
3. Hydrographic Surveys
4. GIS
5. Project Management/Land Administration
6. Aerial/Remote Sensing/Photogrammetry
7. Mapping/Cartography
8. Land Forensic/Law
9. Land/Property Valuation

So hopefully from all this you are starting to see how it helps an accountant in daily life and the workplace. None of the things taken for granted like buildings, transport, cities, water supplies, power supplies, and so on could be done without some attempt at geodetics behind it. Think of an Egyptian setting out to build the Pyramids - even then it was still a part of it.




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