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Your guide to high accuracy mapping in DroneDeploy | Tutorial

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all right everybody today we're going to

be talking about a high accuracy

workflow from end to end so I'm here on

site with my coworker s uh who's another

csse customer success engineer here at

drono so we're going to walk you through

the steps from all the way from planning

all the way to uploading and viewing

your data in drone deoy for a high

accuracy Mission so some things we're

going to be talking about today is uh

some consider ations when flying a high

accuracy Mission so this site is 33

Acres we decided because it's a

relatively small site that we're going

to go with a single gcp workflow if your

consideration even with small sites is

that you really need a high level of

accuracy you can do a full gcp map with

all those gcps encompassing that whole

map but for today's purposes we're going

to do a single gcp workflow where we can

still get really good results for a 33

Acre Site like this so some of the

equipment we have on site today is a an

mlid

rs2 and we're going to be collecting the

actual coordinates of these ground

control points and these checkpoints

that we're going to be laying out today

and we also have a mavic 3 Enterprise

with rtk module so we're going to be

flying this site with rtk as well hence

why we're able to do a single gcp

workflow is because we do have an rtk

enabled drone that we're flying all

right so before we get started we're

going to talk about the topics that

we're going to cover in this video we're

first going to talk about flight

planning with the specific

considerations concerning the mavic 3

Enterprise with an rtk module then we're

going to talk about gcp and checkpoint

coordinate collection using an mlid

specifically the

rs2 we're also going to talk about rtk

versus PPK then we're going to go into

flying the mavic 3 inter r with rtk on

this site and we're going to look at

uploading data uh all your photos and

then tagging those gcps and checkpoints

through the Drone deploy gcp tagging

process then we're going to look at

reviewing the data and doing some

quality assurance on making sure that we

got good accurate data on this site all

right we're going to first talk about

planning your flight before ever going

out to the field for your high accuracy

Mission so the first thing we're going

to do is we're going to do a standard

map here now considering that we chose a

single gcp workflow it was based on a

few factors the first one being the

number of acres here this is a

relatively small site so we can get away

with choosing a a single gcp workflow

here and our accuracy threshold for this

isn't super high but you'll see we'll

still be able to achieve sub inch

accuracy on this map flying the mavic 3

Enterprise with rtk and with that single

gcp and first we're going to choose our

altitude here so for high accuracy

missions we really don't want to go

above 200 ft if we want to deliver very

highly accurate Maps when we're talking

about sub inch as you go higher up to

300 400t you lose resolution in your

photos and thus you'll lose accuracy in

your map so if our goal is is to deliver

you know inch to two 2 in or even sub

inch Maps we want to keep it 200 ft or

below if we want to really dial in our

accuracy we would turn this down maybe

do 120 ft of flying this drone and this

equipment setup that we

have the second thing is that we just

want to map terrain we're not super

interested in structures on this map so

since we're only mapping terrain we want

to leave enhan 3D off this will increase

our efficiency of capture and one thing

we're going to want to do just to

understand our planning time and number

of images is change this to a mavic 3

Enterprise in the advanced settings

button there and you'll see this is an 8

minute flight with the mavic 3

Enterprise with enhanced 3D off we can

also understand our rtk coverage right

here so flying with rtk on this M3

enabled drone we can see that we are in

a covered area now if we were

in an area that lacked coverage with an

Amber or red icon here we would want to

um Fly this with a PPK workflow but the

big consideration with PPK here for

postprocess Corrections is that we want

this flight time to be you know about 10

minutes or more so we could go into

enhance 3D and we can turn on just

perimeter 3D here instead of crosshatch

to increase our flight time or if we

didn't want enhance 3D on we can adjust

our flight speed here to be a little

lower and to increase our time to

capture just to ensure that we have

convergence for that PPK

flight one thing to consider is if you

really want the highest degree of

accuracy possible on this map is to plan

gcps for this map on all the corners 50

ft inside the map plan to ensure we have

enough photos so on this map I'd

probably put one up here in this corner

one here one here one here one here and

then possibly one in the center of my

map generally for rtik enabled drones

you really only need one for every 200

images so we have 276 here so we really

only need you know one to two gcps on

this project but if I wanted a high

degree of accuracy I would want to

capture the corners so maybe I would do

four or five just just to capture the

corners of this map and really ground

and anchor those Corners in to a real

world coordinate but I have decided that

for this one we're going to go with the

single gcp workflow so we'll see how it

turns out all right our first step on

getting the S survey done with the

ground control points and the

checkpoints we decided here to start on

the edge of the side with a checkpoint

now a checkpoint is the exact same thing

as a ground control point it's still a

point in the ground that you survey with

your gns station you're going to record

the coordinates and upload them to drone

deploy there's nothing that changed

practically in these points between the

checkpoints and this ones is just that

the checkpoints are not used for

processing but we do need them to

actually evaluate the accuracy of the

site to get the survey in using the

emlet we need to connect the emlet to an

end trip Network and a hotspot in this

point I'm using my device as a hotspot

and I have a connection subscription to

a provider that is inputting the

correction into the emlet whenever you

go and set up that connection you have

to get the credentials from your

provider and they're going to give you

uh a passwort and a username together

with a port number it's very important

to have the correct port number for the

area that you're

surveying once you input that the main

screen that you have to look into the

emlet is going to be on the status the

status is is going to tell you how many

satellites you have en reached right now

and if you're receiving Corrections or

not the most important thing before you

record this is that you have a fixed a

fix is not going to be achieved if

you're too close to buildings or if you

don't have a strong internet connection

now that we have a fix we can be

confident that the coords that we're

going to be recording now are going to

be precise so we place the rod on top of

the target the target is a high contrast

checkerboard Target the most important

thing in your targets is that we need to

be able to see the center precisely as

precisely as possible you can spray

paint it but we suggest if you're going

to do go that route to actually use a

stencil that actually is going to Mark

or delineate that Center as uh precise

as possible as you can see in this one

this nice Target does have in the center

an opening we're going to be placing the

rod you want to have it as level as

possible in this case my rod does have

uh a level um in the side that I just

need to make sure that is not leaning

too far um above the delineation of what

is leveled now to start surveying your

points in emlet is super easy you just

have to start a

survey you create a new survey and here

you're going to give it a name now

besides the name the most important

thing is going to be your coordinate

system your coordinate system the best

way to define it is going to be

identifying the epsg code and just make

sure that you're surveying in a code

that you're actually going to be flying

and processing in drone deploy but also

if you're going to be using the data

outside of drone deploy to have that

same code on whatever design files

projection system you're using so it's

very important to have a cohesiveness on

the epsg code throughout the life cycle

of the capture in this case we're using

a provider that is using wsg84 so I'm

going to try to match their settings

even the vertical datum to whatever

they're using CU it's very important

that this considered the rubber is

matching whatever the base is

projecting and then once we have that

defined we are going to start serving

all right so for this point um one of

the considerations we had is that we

wanted to make sure that when we're

setting up these targets they are 50 ft

away from any obstacles so trees

buildings things that could obstruct the

view from the Drone to the Target when

we're actually doing our mapping Mission

so here we're about more than 50 ft away

from any obstacle we're in a clearing

here and we'll have a really good uh

picture of the this target from the sky

when we do that mapping Mission so we're

getting ready to fly our mavic 3

Enterprise the very first thing that I

do is to connect to a hotspot again and

that's because I'm going to be opening

drone deploy and we want to get rtik

signal so I just connected it to the

hotspot by swiping

down clicking into the Wi-Fi area I'm

looking for my Hotspot right there is

connected so we got good signal coming

back to draw deploy so for this flight

we're going to be flying with rtk uh

instead of PPK we do have good rtk

connection on this site so we're going

to be using rtk as our default workflow

here which means we need to be connected

to a mobile hotspot or Internet

connection on the controller to have

that work in drone deploy um if we were

using PPK we would want to turn off that

uh internet connection Al together and

upload those uh MRK and OBS files which

we'll talk about later for flying with

PPK versus rtk rtk is going to be

realtime kinematics so we're going to be

making corrections to these images from

the Drone in real time so that's uh why

we require a strong internet connection

and our TK coverage at this site where

PPK you would want to fly that in sites

with no coverage or limited coverage on

our rtk Network also anywhere where you

may not get like an internet connection

on the controller um the the key

takeaway there is you know you want at

least 10 minutes for for convergence

time on PPK we do advertise in fast

regions you know around 2 minutes but I

I definitely suggest trying to get that

flight time around 10 minutes for a PPK

flight

all right as we're getting ready to

start a flight checking our altitude and

everything we're satisfied airspace is

good rtk coverage is green I can start

my pre-flight

checklist submit it here is a good idea

again to check that rtk flag if it's

Amber it's still going to give you an

alarm and you can retry that connection

and then make sure that it gets to the

green once that flag is green you're

good to go you should be getting

Corrections for the flight we're going

to click Start flight

and check our

drone it's very important for the rtk

for your controller to remain connected

to your hotspot so just make sure that

you don't disable the Hotpot in your

phone or a hotspot device that you might

be using if you do that during flight

you might you're for sure going to be

losing that correction signal during

flight okay after collecting all the

data on the side I am ready to upload

the images where on the upload tab I'm

going to click new upload I'm going to

choose my files which is going to be

from my SD

card going to try to find the folder for

the images that were captured on this

location which are going to be this

ones I'm going to select all of them if

I do include these two files that

MRK and OBS I will also have a

PPK correction on my

map as we can see in this next screen we

do have more options towards the right

hand side on my map I'm going to click

into that and I do have the option to

add

gcps I can download the right template

over here paste my C coordinates that I

got from the Emet

file which I already

did and we are going to upload that CSV

right here it's going to identify the

epsg code just going to make sure that

one is right and I'm going to start

uploading and then my next step is going

to be to wait for an email to review the

ground control

points okay after the map processes in

the cloud

you are going to get an email to review

the ground control

point so we will click into that

email and then we're going to get to

this screen on this screen the main

thing that we have to do is to make sure

that the crosshairs are hitting the

center I'm going to click on edit to

actually have a closer look on each of

these points they seem to be pretty

decent but it's important to even find

two it to make sure that we don't

introduce any inches of

error by not hitting the center all of

these look pretty

decent and I'm just going to be continue

to continue to review each one of

these some of them are just a little bit

off especially this one in the

bottom you might have more images and

over here in the top if you have this

button it's good to click on

it and it's going to take us to another

screen with more images that actually

touch that

point if I am happy with the aim of all

all of these

points I can

proceed and click on the top submit CR

control point and move on to the next

one since in my CSV I already

had um

labeled two of my points as checkpoints

they already already appear here as

checkpoints but I still have the option

by clicking into this window to change

it to a ground control point or VI Versa

okay after you're happy with all of your

points you can have a final review right

here and then click

submit the map is going to process again

and it's going to get fixed to those

points and you're going to get an email

with that map is ready all right so now

we're going to briefly talk about

viewing our data what after we've

captured uh We've uploaded and we've

processed our

map so the first thing we're going to go

uh and check on is under map details

we're going to click on map and then go

into processing

report and you can see right here that

this is a new feature we're adding we're

showing you what high accuracy workflows

were flown with this specific map map so

here we have rtk gcps and checkpoints

applied to this map now that we're in

the processing report we're going to

look at a few things first so the

average GPS trust here is super low what

this indicates to us is that we had a

good rtk fix on our entire map um the

higher the number is the less trust or

the less quality of an rtk connection we

actually had on this flight anything

less than one here is good number um

this one specifically is .13 Ft this is

what we want to see for our average GPS

trust the next thing you'll see here are

the gcp and checkpoint count we'll

actually look at this in more detail

further down the screen the other thing

to keep in mind here is our coverage

quality so this map right here is

showing us that we had good overlap on

our images you can see some portions

where we had a little bit more marginal

coverage where it's green here in the

middle of the map

this makes sense on this specific map

because we had tall trees that were

captured in the photos so the overlap on

the difference in elevation between the

ground and the top of the tree uh is

going to be less at the top for overlap

than at the bottom on the ground um I

think that's going to be okay here I we

haven't seen any issues to let us know

that you know we have abnormal stitching

or anything like

that and and then finally the tables

that we're really concerned with here

are our checkpoint values so what we

really want to see here are you know

anything less than 2 in is really what

we consider a good map for a high

accuracy Mission obviously we would like

to get these tolerances as tight as

possible so the less error here the

better generally we'll always see better

results in the XY than the z-axis but

overall this looks like a pretty good

map our Z error is less than 2 in and

our XY is sub inch accuracy here also we

don't see any issues with the tagging on

this

gcp and no issues stand out in this

report so single gcp workflow we flew on

this site it was a relatively small site

and we saw good results by placing two

checkpoints throughout this map one on

the North side one on the south side and

and our data is good and we can trust

this for alignment we can trust this for

Earthworks calculations and we can trust

this to pull this these exports like

Point clouds or obj file any geotiffs

into other software to rely on this data

to align to any modeled objects or

anything like the that we have in other

software we can also rely on this data

for pulling in Geo reference files to

ensure that those Geo reference files

will align and draw to play

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