GIS/CIVIL Engineering problem.

Yes it can be done but the procedure may differ with requirements.

Do you have GIS software?

What type of images? (satellite, photos , maps, drawings, plans)

Country and projections used?

What type of shapes? (fields, areas, buildings, roads, rivers )

Accuracy?

In short - what is the purpose?

5th Jul, 07

Hi Hendrik,

Below is the description of the project sent to me by our client.

3D SCANNING

Description The project involves scanning and buildings both externally and internally for accurate drawings of the building. We will use scanning outside and inside for creation of complete point-cloud-model of the building. The attached sample shows different rom-sections.

We will scan and put together one complete point-model of the complete building. We can thus deliver q point-cloud of a room which can run as one test data set.

The end client wants one intelligent 3D model of the building of IFC standard.

General information from customer

3D modelling

From the point cloud model to a 3D model - the modelling process In the point cloud we create CAD objects. We use Cyclone 5.1 for this, in which we have developed a high level of competency. By utilising different techniques we can establish a CAD model based on each object and set it to millimetres accuracy. This accuracy is somewhat dependent on the object to be modelled, but is generally within +/- 2 mm.

The CAD model can then be exported to AutoCAD, Microstation, PDS and PDMS, depending on our customer's requirements. The model contains all the objects in the defined scan volume, represented in one way or another. The objects may be in the shape of detailed object presentations, though in some cases it is more appropriate to present the volume with a box stating "this is occupied". The level of detail determines how long it takes to establish a model.

The modelling of point clouds. The models are custom made and will differ from project to project. Should the customer at a later date require more information/more details, the point cloud contains enough information for us to review and enhance the detailing.

So, exactly what is your problem? By your post, it seems as though you have this all figured out. Am I missing something?

The accuracy you require (survey class) exceeds all my current applications.

The resolution of normal satellite images is much less, and the distortion on photos will also render it useless.

The images used seems to include manipulated photos of the inside of buildings.

Your objective for using GIS seems to be centered around objects that can be selected and manipulated.

To import shapes into a GIS system you can have the external program create a data set and import them into GIS by using a text file or Excel spreadsheet.

6th Jul, 07

Hi Hendrik,

Thank you for ur reply. but can you help me in how much to quote for this project. i.e, how much should be per hour rate?

6th Jul, 07

Hi Hendrik,

Thank you for ur reply. but can you help me in how much to quote for this project. i.e, how much should be per hour rate?

S CHANDRA SEKHAR

Really difficult to respond. unknown territory.

Do you have any sample images available and the type of vectors you require?

Thank You. Mr Hendrik for your timely & wisely replies

S CHANDRA SEKHAR,

This is one of the things I do. It can be much tougher than you think. It depends on the quality of both the input and the output required. "Garbage in, garbage out." I would suggest that you hirer or bring in an outside consultant to your team. Sure you can scan stuff in and vectorize it, Both getting it into a GIS coordinate system such as a state plane coordinates or UTM, or laongitude and latitude is a different animal. This also depends on what the use is. Even for small things like water lines that run adjacent to existing roadways, there can be great liability if it is not presented correctly. There have been too many of those kind of things messed up now. At my house the GIS mapping shows that the waterline is on my side of the street. It is on the far side of the street and about 400' away from where the mapping shows it. That is a big difference.

On top of that you are indicating that you are ready to practice outside your expertise. That is an ethics violation in the sates I am registared in.

Again I suggest that you consider subing this part out to someone outside. If this is a client that respects you as an engineer, he will respect the decision to pay for the outside consultant. Ask them to pay it separate. That way it does not impact your fee. If he requires it in your fee, add a handling charge of 30%.

JR Peck

Thank You Mr. jrpeck for your relpy.

S CHANDRA SEKHAR

Hmm,it sounds like you are asking for your T&M rate when you say how much per hour. This you should probably already know. Take your equivalent salary in $ per hour and multiply by about 2.6 to 3.2, this gives a hourly fee rate. Now the tricky part is actually estimating the amount of time it will require to accomplish the task for the staff you plan to use. Once you know the time you can supply an estimate of the total fee.

Shouldn't you know how to prepare a proposal by the time you are a managing engineer? What company do you works for? (did it just increase in size from about 26,000 staff to 50,000 staff?)

Firstly, having done vectorization from scans before, I would like to see the QUALITY of the scans first. Because if you are digitizing a poor photo, that is a major time waster. Especially if you're trying to get to >1mm accuracy.

Secondly, if you're scanning blueprints from inside a building, they don't need to be georeferenced to a projected system. I am not clear on why that is needed.

Thirdly, in California, the hourly rate for this is $200us. depending on how much scanning and digitizing this could be VERY pricey.

You can find good technical artists in the Silicon Valley that do this type of work for 70 to 80 dollars per hour.

Thank you, Mr. GISdude.

S CHANDRA SEKHAR

Look in the records first and see if thier are any old quotes detalied enough to get you started.

Hi Chandra,

I will refer you to Sivan Design, it is an Israeli company also operating in Nigeria, USA and some other contries. I have worked with them in the past and I believe they have the solution to your problem. You can reach Mr. Shlomi Sivan at www.sivandesign.com

He can help you with the latest ArcView technology in the world or CivilCAd. If you have any problem, let me know

Best of luck

Chris

Thank you, Mr. Chris Eriom for your reference.

Hi,

You can digitize features of your interest using those raster layers(images) as the base i.e. on-screen-digitizing. You can do that easily with ESRI product such as ArcGIS or ArcView.

I am at the internet cafe so cannot spent longer to describe step-by-step but if you're still looking for help try me here 072 11724 76 or methodman@webmail.co.za

John

Hello Sir,

I am Nilesh Kumbhare.

You have to scan the raster images using correct resolution so as to save the colour effects and clearity.Afterwards you have to decide software for digitization(AutoCAD Map is the best).Just insert this images in this software as raster image and then use correct Lat/Long co-ordinates to place this image at correct geographical location.Now this image will get registered at its correct Lat/Long co-ordinates.Now you can start degitization using Ployline feature.

This step is for data creation and for data processing you have to project this map using proper projection system.I think this activity is out of your scope.

Regard's

Nilesh