Week 3 Challenge

1. Aim:-To Create A Terrain Model Using Different methods and using different types of Raw data i.e. Graphics,PNEZD,Dgn and Tin file.

(a) From File:-

Procedure:-To create Digitally Terrain Model through Survey file Using Open road modeling.First open a 2D Blank dgn file,Then select terrain menu bar and chose from file.Import file "survey.dtm".File open with survey data here we can append other survey data if any upon parent file.Chose Existing contours as feature defination.click on triangular option and import Terrain only.finally click on import button and close.Go to fit view.we can see the alignment details in explorer menu bar and change the properties name and feature as per requirement .we can also change the contours interval 5 to 10 through properties calculated feature option.we can rotate and change the attibutes through 3D view as well.

:-plz See the Attachment.

Result:-Hence the final Contours and triangles are obtained through file option of terrain modeling.

(b) From Graphics:-

Procedure:-In Terrain Model through Graphics, first we have to open a seed 3D blank Dgn file with interactive method.Now we have to attach a reference file i.e.3D survey gaphics to create terrain by them.Now Click on terrain from Graphical filter where we have to create a filter group in which we create two or more filters namely spot,breaklines,voids etc.Go to filter and add filter levels as given by the surveyor one by one.next add them in filter group as well.now we go to main menu create terrain from Graphics and add filter group with filters.select existing triangles as feature defination and named terrain by graphics as well.Right click to accept and shown the existing triangles.On and Off the reference display to see clerly the traingles from spots and breaklines formed uniformly.

:-Plz see the attachment

Result:-Hence we can see the final existing traingles through graphical filters using graphics.

(c) From Element:-

Procedure:-Another Important method to create terrain model Is element seletion.At First We have to open a seed 3D-blank Dgn file with interactive method and attach a reference file i.e.3D survey gaphics to create terrain.Now Select the element using element selection tool bar (by element or level)i.e Cell,Line string,Line.Then select contour as feature type and existing triangles as feature defination from Element tool bar.Finally accept the selection from element and click ok to generate contours and traingles by them.we can also add fetaure by selecting triangles i.e voids and remove feature aas added earlier as well.If required,We may also used the level display to select the Sv point to create the traingles.

:-Plz see the attachment

Result:-Hence we can obtained the existing traingles by element selection tool bar and also select the element through level display manager as well.

(d) By text Intrpolation:-

Procedure:-As the name imlies that this process is based upon the selection by text to create triangulation.The process is same using blank 3D dgn file with a referece attached 3D graphics.Go to level display,and "ON" only major and minor contors through which we can filter them as linear and text one by one through element seletion in filter manager tool bar as done in earlier methods.Now select filter and finally accept data point with feature defination and ok.

-Plz see the attachment

Result:-Hence we can obtained the contours, traingles by text interpolaion method using filter function as well.

(d) By ASCII:-

Procedure:-This one is another useful method to create terrain model.Here we use the File format which is in PNEZD text doument form and get import through data import setting file.There is no need to attach any reference for that.In setting file we set data import line,coloumn,feature defination, point and co-ordinate sytem as well.After complete setting there is an option to save the file as XML as well for further change.Then finish to get existing triangles.

-Plz see the attachment

Result:-Thus by ASCII function of ORD we can easily obtanied the existing trainges through PNEZD text file.

2. Aim:-Used a terrain model by any Method for terrain modeling with clear un-wanted triangles and zero elevation points for further design of alignment.

Procedure:- At first used the dgn file from ASCII where bad spots and un-wanted traingles created due to elevation error.so we now import PNEZD text file again and set the text import procedure.First we can check the ASCII text file where we got the zero elevation with discription default with station.so using filter menu bar we may exclude or include what data we want for further traingulation processs.exclude the zero elevation points from filter bar and accept with feature defination existing traingles and feature type spot as well.After that we got the right terrain with no bad spot with dense triangulated area.

-Plz see the attachment

Result:-Thus by using filter menu we can easily filter a zero elevation points or other if any,and got a clean terrain.

3. Aim:-Aim of the question is that how to Export the terrain model which is created by any of the used methods.

Procedure:-At first click on the existing terrain model, open flyout menu click on export terrain model and saved different file format i.e Land xml,Tin and dtm as well in terrain folder of the data set.And also we can export through explorer menu bar under terrain model.

-Plz see the attachment

Result:-Thus by using export method of terrain we can export different file format as per need.

4. Aim:-To make the idea of importing of differernt file format.

Procedure:-Click on the file menu of terrain tool bar and import dtm file from there.Using the same method we can import the other file format from there.

-Plz see the attachment

Result:-Hence we can import different file formats using different methods as well.