Placing Ground Control Points

If you are planning to do a precise drone mapping, you will need to prepare ground control points for your project. In this video, we will explain what ground control points are and how to place them.
RTK over LoRA Radio: • Reach RS2: Setting RTK...
RTK over NTRIP: • Reach RS2: Receiving R...
00:00 - Introduction
00:19 - What GCP is
00:52 - Requirements for GCPs
01:11 - Basic Rules of Placing GCPs
01:58 - Measuring GCP’s position
04:00 - Exporting GCPs’ coordinates
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Learn more about Reach RS2: reachrs2.emlid.com/
Reach RS2 documentation: docs.emlid.com/reachrs2
Support forum: community.emlid.com
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[@Emlid]

Hi everyone! Recently, we’ve redesigned ReachView 3 settings view to simplify your work. Check out our post to learn more about changes: community.emlid.com/t/reachview-3-update-redesigned-settings-view/31658

[@allanescol7657]

Sir how about using total station established 3d coordinate gcp corner of the building?

[@Barrometre]

This is very clear. But when I am using an Emlid RS2+ as my Base Station and my drone as a rover, do I have to move the base station wherever I want to put a GCP?

[@lztoniolo]

Hello! I have a doubt: when you are measuring in this way and you're working in UTM projections, you have a difference between the GNSS coordinates and the local coordinates, like measurements from Total Station. Shouldnt the GNSS be calibrated to real/local system using 4 or more Total Station points to get the REAL distances? How to make GNSS and Total Stations coordinates to be the "same"?

[@formulabred3553]

Can you have the rs2+ as a base and shoot your gcps with another rs2+ as the rover? Not sure if this is what you meant on the video. Thanks!

[@Emlid]

You sure can!

[@AbdulazizAlzahrani-bc7nx]

how GCP and targets can be distributed for image registration, THANKS A LOT.

[@Emlid]

Hi! There are two general rules. They should be allocated evenly in the area where you survey. For example, if you use 5 points, set per one for each corner and the last in the center of the area. And they must not be on the same line.

[@thaddeush.llewellyn2698]

Select CRS in Project - I like it. When?

[@Emlid]

Hi! We released ReachView3 Beta recently. Here is our post on Community forum about ReachView3: community.emlid.com/t/reachview-3-beta/19805

[@TravelPakistsn]

How I can stake a line in and set its corridor?

[@Emlid]

Hi there! At the moment, you can do only points stakeout via ReachView, but you can use 3rd-party apps for your task. Reach receivers easily integrated with them on Android by using the mock location feature. Here is our guide on how to do it: docs.emlid.com/reachrs2/common/tutorials/mock-location/. We'd also recommend checking our community forum to find more information about such tasks: community.emlid.com/

[@townierecordmuzik]

My reach view app doesnt look like the one you using

[@Emlid]

Hey there! In this video we use ReachView 3. We released this version recently. Here is our post on Community forum about ReachView 3 Beta: community.emlid.com/t/reachview-3-beta/19805

[@princessjoylenepalicpic5689]

Why it is needed to have at least 3 ground points?

[@Emlid]

Hi there! 3 ground control points is a minimum for a reasonably accurate survey, but enough quantity of GCPs mostly depends on the site area. Usually, it's 5-10 points. You can also find more information in our text guide: docs.emlid.com/reachrs2/common/tutorials/configuring-reach-for-mapping/#placing-ground-control-points :)