hi guys and welcome back to SITENG where you'll find the best civil engineering content here on
you tube and in today's video guys i'm gonna show you how to create a local grid and have
a look here behind me i already did it and i'm gonna show you step by step how to do it and this
video you're gonna be first out of two in which i explained everything about the local grid and as
i said in two days we're gonna just create a local good we're gonna scale the drawing and we're gonna
prepare drawing for using the local grid and in the next one uh we're gonna actually transform all
our control station points we're gonna use this grid line here to align all other drawings from
different floors different levels and this way we're going to be able to do everything we want
with a local grid so let's go so guys first of all obviously i need a drawing where where we got
all the grid lines so we can actually coordinate them and uh yeah the best would be the drawing
with all the grid lines so you can use them later and this i'm going to show you in the next video
where i'm going to be doing aligning on all the stuff and using actually this grid to bring all
the other drawings but this is the beginning and then we need the drawing here so i'm going to
use the one which if you watch my previous videos you've seen that that was my job in collindale and
this is block a here and if you can see here this is a good example because uh in this one we got
the two grease uh in different angle which means for this job actually you would have to create
two local grids but what i'm going to do now i'm going to show you how to create a local grid for
for this one and we're going to use a first grid here for this block that's going to be A7 and i'm
going to use a as my reference and then create a new coordinate system and i'm gonna move at
this particular point the crossing of these two gridlines but guys the first thing first if you
can see this drawing is actually in millimeters so first of all i'm gonna actually scale it and i'm
going to change it into meters so how we're going to do it we just obviously we're going to mark it
this way or ctrl a we're going to mark all the drawings and i'm going to put a sc for scale
press enter and then it doesn't really matter what base point i'm gonna be i just left click it here
and to make it from millimeters to meters we need to actually scale it by
0.001 as you obviously know the 1 meter is 1000 millimeters so then i'm going to press enter here
and i'm going to have my drawing here very small you can see my operation didn't scale
diameters but i can actually mark it all select similar and i just deleted really i don't need
so now our drawing here is in meters and we can actually check it here uh using some uh dimension
so let's go from eight eleven to eight twelve five point uh one two eight five i see that we
got four decimals here we don't need that accuracy three is enough anyway but uh we're gonna leave it
for now you can see now is meters and before was millimeters so that's the first point guys we're
going to scale the drawing we're going to make it in meters as with the EDM and on-site we're going
to be working with meters obviously looking for accuracy into the millimeters but i'm going to
go back to that grid line it was A7 i think so A7 and aaa what i'm going to do guys now i'm going to
create a new coordinate system i'm going to use a ucs command for it you've probably seen it before
and i'm going to press enter and from this gridline that's going to be start of my uh
coordinate system but that's for now anyway so i'm gonna go i just wanna make sure this is
uh parallel to that grid line and then we're gonna go the other side and uh click it here
and as you're gonna see now in a minute i'm just gonna maybe put the point in here so you can see
maybe change the point style uh quickly so you can actually see this point so uh let's bring it here
okay yeah that's well enough so if i'm gonna press id now and we're going to check the position of
this point that's uh exactly zero zero so you can you can see now and what we're going to do
now i'm going to move all this drawing to my coordinate system so how we're going to create
it is actually entirely up to us what numbers we're going to choose for easting for northing it
doesn't really matter as then later to work with our new created local grid we need to transfer we
need to transform actually our our control points targets or whatever station we're using we need
to transform it into the new local grid which we are creating now so guys maybe to quickly explain
what i'm talking about i'll take that gridline A7 and a a and i'm just going to copy selection
and i'm going to move it wherever here so that's going to be our new coordinate system and it's
exactly the same story guys uh with the cartesian coordinate system with the cartesian plane which
you were probably using back in school a long time ago but that's exactly the same story here
so that's going to be our easting guys this is the easting axis so that means all easting is
going to be running this way and this is the northing so all north is going to be running
this way guys this is very important because i remember i worked with one engineer uh he
couldn't actually understand why this is northing x is why the northings running this way uh so he
probably missed that lesson maybe back in school so obviously guys this is the north like you
remember it was x and y or y is going to be here so one two three four five this is why and this
is x one two three four five and it's all going this way so same with the eastings and northing
and guys uh it doesn't really matter what we're gonna use but i'm gonna use for this one for uh
for this particular example i'm gonna use i'm gonna mark this uh easting green line aa is 5000
and the northing we're gonna go two thousand so my point here gonna be actually easting 5000 and
north in 2000 and that's going to be start of my local green so what i'm going to do now as i said
i'm going to just move it here i'm going to mark it all and i'm going to take my particular point
which you can see here how big it is and i'm just going to use move and what i'm going to
do now i'm just going to move it to my point which i wanted so that going to be easting 5000
and then uh northing 2000 and i'm gonna press enter now i'm gonna double click the reel here so
my drawing was moved quite far obviously from zero zero it was moved five thousand and two thousand
north so i'm coming here i just got my point here i will double check it quickly using the id point
it should be five thousand two thousand so that's what we got guys five thousand two thousand so our
drawing is now coordinated to our local grid we created just a local grid and we just double check
it quickly if this is actually working so we can actually check quickly the distance here between
grid line a7 and a9 which is 12 338 and we can check we can do the same thing from my starting
point in here to the grid line i believe they're going to be a b let's quickly have a look here
bm it doesn't really matter so uh what i mean by that we got 12 meters 338 millimeters distance
from gridline a7 to b9 a9 and then we got four three five five from grid line aa to bf ibd so
that means the coordinates for this point here and i'm gonna press point here crossing
of these two grid lines should be easting 5012 338 and northing for this point here
would be two thousand four meters three five five millimeters so that's guys how it works and that's
how we're gonna be calculating the position of every single point we want here now on this drone
but i'm gonna use id point and just quickly double check if this is working now let's have a look
that's exactly what it is easting 5012 338 and the northing is 2004 355. so this is working now
guys i'm sure now our drawing is ready and as i said guys you see that this grid line is going
to be our easting axis here so all the easting's going to go this way so that's the easting here
and that's why the easting is five thousand twelve three three eight so that's exactly how simple it
is really you just need to obviously uh try a few times um and after the next video you're going to
be able to download a few drawings just so you can actually uh train yourself so guys the local grid
is created for this drawing for this job actually and i'm just going to take it grid lines and just
move it to some other drawing as in the next video i'm going to show you how what we're going
to use it how we're going to use it and how we're going to transform our control stations
and how we're going to be bringing all other drawings from different floors and we're going
to be aligning them to our new local coordinate system so what i'm going to do i just uh
quickly select similar and obviously i'm going to need my grid line numbers as well
that are going to be used i'm just going to maybe something similar this as well so as you can see
all my grid lines are marked maybe actually i'm going to take it with my point and i'm going to
use the ctrl shift c and i'm going to move it with a base point zero zero i i'm gonna actually open a
new drawing here autocad okay it doesn't really matter and i'm going to paste it in here in the
new drawing ctrl v 0 0 and then i'm going to look for my drawing which is actually here and what i'm
going to do now guys i just save this one as a local grid for our job whatever job gonna be so
uh local grid uh i'm gonna save it here uh where's my point and my point somewhere here i'm gonna
change quickly the point style just to double check if everything is correct so i just double
check quickly using id but this is obviously the same point five thousand two thousand and this is
actually new local grid created here guys and this we're gonna be using for our job and that's how
easy it is and that's gonna be guys uh the end of this video if you got any question about this one
if if you if you don't understand anything so far please let me know in the comments just write what
what you need to know if something is not clear i'm gonna let you know and wait guys for the next
video when i'm gonna explain more about it and when we're gonna be actually transforming the
control points so we're going to be able actually to use our local grid on site as obviously we need
to base our edm in the new system so guys thank you again for watching as i said uh if you got any
questions leave the comment below and uh don't forget to leave the thumbs up if you like the
video and if you are not subscribed yet please do so guys and turn the bell notification on so
you're gonna be notified about the next videos so thank you again for watching and see you next time