hello and welcome to the first module of the dgi's muse l1 training course this module forms part of an informative series aimed to provide you with a comprehensive understanding of the xem you sell one throughout the course you will begin to understand the best practices used to obtain good quality and accurate data from your lidar surveys given the nature of lidar there will be guidance on all steps including hardware preparation mission planning mission monitoring data processing and sensor calibration there are no prerequisites to this course however feel free to pause and research specific areas if you would like to understand the underlying principles in greater detail importantly this course has been designed to provide you with the ability to obtain data that is both good quality and accurate without any previous experience with lidar data if you have used lidar units in the past or worked with the data closely then you may notice that some steps are very similar to other systems and workflows before collecting data it is very important to know what the system can and can't do and likewise what components are involved with the unit itself our first module will aim to provide us with a familiarization of the characteristics of the sensor and the technical specification of the hardware and software involved firstly we can take a look at the hard case used to protect and transport the xem you sell one given the nature of the highly accurate lidar unit it is crucial that the hardware is protected appropriately as such dji provides a hard shell style pally case to keep the unit protected from any direct knocks however it is important to note that the l1 hard case should still be kept secure when in transportation to ensure that your unit does not experience any drops or falls this is important because the l1 is heavily reliant on a self-contained high accurate inertial measurement unit that is used to accurately determine the directional movement of the unit when in flight as the imu data is used when processing your data it is essential that the imu is working to its best effect likewise in order to protect the l1 from the elements the hard case is also ip67 rated meaning it is fully waterproof taking a closer look inside of the box we can first see the unit is secured by foam inserts alongside the accessories also contained within the package again this further improves the security of the precision system the first item we come across is a six month free trial to dgi terror dji terra is the software used to process your raw data from the l1 in order to develop a fully calibrated and optimized point cloud dji terra also provides the ability to perform some very basic analysis customization of your point cloud and adjustment to the coordinate system your data lies within we will take an in-depth look into the dji terra platform in a later module as it is a crucial part of the workflow inside of the same form slot we also have the product certification and quick start guide the product certification is something that is required for most electronic equipment used in europe which certifies compliance with a number of directives for example electronic waste likewise the quick start guide is also included in the form slot providing you with a hard copy of the manual illustrating basic operations however it does not provide any detail on workflows or data collection towards the back of the hard case you'll also find a lens cloth used to wipe down the lens of both the lidar reflective sensor and the rgb camera sensor for the grommetric and lidar data outputs are very reliant on the high resolution and good quality data therefore any marks or particles on the sensor can significantly affect the output even if very small every couple of months it is recommended that you replace the lens cloth to ensure that you're not further damaging the sensor with any embedded particles if your cloth becomes dirty or wet always replace it to ensure your lens does not become damaged now let's take a look at the sensor itself the zemucel one comes as part of a three axis gimbal allowing for greater usability in enclosed environments as you can see the sensor can rotate freely on the system when it is not connected to the aircraft this is normal a lot like other dji gimbals the l1 also uses a skyport connection meaning it is directly integrated with the corresponding gimbal connector on the matrice 300 rtk in a later module we will provide a demonstration of how to connect the unit to the sky port on the aircraft to protect the sky port a gimbal connector is also provided likewise as we take a look at the front of the gimbal you will also find a rubberized lens protector used to further protect the sensor itself as the l1 reflective sensor is made of glass it is important to always place the lens protector back onto the unit when finished capturing data if it is your first time opening the package you will also find a protective sticker on the reflective sensor please remove this in preparation for your first flight this sticker may be kept and replaced for further and ongoing protection however your main protection comes from the rubberized lens so please do not worry if the sticker becomes unusable the l1 sensor itself is in fact from the livox sensor range beneath the lidar sensor we have a one inch cmos sensor representing the same specification as the phantom 4 rtk photogrammetry solution this can be used as a standalone photogrametric or photography solution or in order to provide a colorized lidar point cloud the third sensor located at the bottom right of the payload is a camera used specifically for vision positioning and to mean a degree of accuracy if there is a loss of gnss signal however this is for fail-safe only and is only recommended to operate with a gnss signal inside of the unit itself is where you would find imu which helps to form the fully integrated survey and lidar units that dji have developed for data storage purposes you will find a micro sd card slot on the side of the sensor we will provide you with more detail on the recommended cards in the next section this now completes our introduction to the sensor characteristics and we will now move on to the technical specifications of the system that directly relate to the data that you should expect to collect the diagram on screen provides an illustration of the xem you sell one and the components that have been used to develop the integrated mapping solution in order to provide you with full oversight of how the system works we will break down each component individually the first component we come to is the gimbal connector as previously mentioned this uses the dji skyport connector similar to other dji payloads the skypod is connected to the aircraft through a quarter turn until the two red dots align this is something that we will visually illustrate in a later module the next component is the pan motor used to orientate the gimbal from left to right whilst there is a definitive extent to which the payload can pan you can fully orientate beyond 180 degrees either way this means you have a visibility around a full 360 degrees the third component is the lidar itself the lidar sensor is a green glass sensor on the front of your pillows that is used to emit and receive returned laser beams that are used for direct measurements of points of the area of interest essentially the time difference between the laser emittance and it being received is measured in order to calculate the location of a point in a point cloud it is important that the reflective surface stays reflective to ensure as much data is recorded as possible as discussed in the unboxing video the sensor also holds a standard rgb camera that represents the same specification as the phantom 4 rtk and can be used for photogrammetric purposes however in tandem with the lidar sensor it can also be used to generate colorized point clouds item number five relates the auxiliary positioning vision sensor is used to assist the drone when gnss systems are not recording to full effect it is also used to help position the drone when the aircraft is landing located on the bottom left-hand corner of the right side of your payload you will find the microsd card slot a lot like other matrices 300 rtk payloads the sd card is micro sized with the xem use p1 being the only other payload that requires a normal sized sd card as standard you will receive a 64 gigabyte sd card with your l1 for data capture purposes however if you wish to use a larger sd card you can do so but please make sure that the sd card can write quick enough for l1 data capture our seventh marker on our diagram illustrates the location of the tilt motor which is found on the right hand side of the payload the tilt motor is the second axis of a 3-axis gimbal and allows the payload to tilt forward and backward which is especially useful for an idea and oblique data capture applications the final component of this mu cell 1 is the raw motor and allows for the gimbal to rotate left and right in combination with the tilt motor this can also assist with operating the payload at oblique camera angles that completes the three axis gimbal setup of the zemucel one and likewise concludes the breakdown of the l1's visible components the imu is located inside of the main l1 unit and is the component that requires calibration before during and after the flight therefore we will take a closer look at how to do this in a later module in the next part of this module we will take a brief look at the technical specifications of the xemucell1 the unit itself is a little over 15 centimeters in length 11 centimeters in width and nearly 17 centimeters in depth whilst also weighing 930 grams making it a compact and lightweight lidar solution as standard this emu cell 1 will use around 30 watt of power during flight however this can rise up to a maximum of 60 watt during high intensity missions whilst the l1 does not have an internal battery it pulls power from the tv 60 intelligent flight batteries housed on the matrice 300 rtk like the m300rtk the xemucell1 also holds an ingress protection rating but instead of ip45 it holds an ip54 rating to break this down the first figure relates to intrusion protection and with a rating of five this means that the unit is protected against just limited ingress no harmful deposits the second figure relates to moisture protection and with a rating of 4 this means that the unit is protected against water splash from all directions limited ingress permit although not completely protected the xenus l1 has significant protection against both intrusion and moisture meaning emissions in more adverse weather conditions are possible although it is still important to consider how such weather conditions will affect your data the operating temperature of the xemucl1 lidar sensor is between -20 degrees and 50 degrees celsius however the rgb sensor is slightly more stringent with a warmer bottom bracket of zero degrees celsius but with the same upper bracket the storage temperature on the other hand holds an operating bracket between -20 degrees and 60 degrees celsius moving on to system performance we can first look at the detection range which refers to the farthest measurable distance of the lidar a surface with a reflectivity of 80 will allow for detection up to 450 meters under zero clarkson also known as solar illumination a surface with a 10 percent reflectivity will allow for detection up to a range of 190 meters under illumination of 100 klaxon the main influence and factors include the target's surface reflectivity the target shape and ambient light interference most lidar sensors on the market use diffuse reflection objects as their testing benchmark however this parameter has limited practical significance the measurable distance at a reflectivity of 10 has greater practical significance in many applications there are very reflectivity therefore lower flights are recommended we will cover this in more detail later in the course the xemucell1 can be flown with a different number of return measurements per laser output which directly affects your point sample rate amongst other things such as flight speed and height when using the l1 with a single return rate you can expect to obtain a maximum of 240 000 points per second whereas with a dual or triple return you can expect up to 480 000 points per second it is recommended to choose dual echo mode if you need more measured points or choose triple echo mode if you need higher penetration a low accuracy depends on a number of variables the zemucel one is capable of achieving an accuracy of at least 10 centimeters in the horizontal and five centimeters in the vertical when flying at 50 meters dgi have validated this to an accuracy of one sigma meaning a 68 likelihood during flight the enterprise smart controller supports real-time point cloud coloring allowing you to watch your data construct live as standards you can view your point cloud by reflectivity height and distance however if rgb coloring is enabled you can also view in this mode looking more closely at the lidar itself it holds a range and accuracy of three centimeters at 100 meters which as opposed to the system accuracy refers to the relative measurement between the sensor and an arbitrary point when working in a multiple scanning mode the zemucel one can achieve up to triple returns as lidar sensors emit laser beams it is crucial to understand whether they can be harmful in this case of the zemucel1 it falls into class 1 which is safe under all conditions and normal use therefore no concerns field of view also known as scan angle represents the angle covered by the lidar sensor or the angle at which laser signals are emitted given the nature of different scanning patterns the vertical field of view is different for each type whilst the horizontal remains the same it's 70.4 degrees for a non-repetitive scanning pattern your vertical field of view will be 77.2 degrees whereas a repetitive pattern would have a far smaller 4.5 degrees a repetitive scanning pattern is particularly useful for topographical surveying when accuracy is of the most importance and a non-repetitive generates a greater point cloud density but with a slightly reduced accuracy particularly good for urban reconstructions whilst the inertial navigation system is something you cannot control nor effect we will take a quick look at the specification it holds all of which is crucial in the capture of highly accurate data an imu update frequency of 200 hertz an accelerometer range of plus or minus 8g an angular velocity meter range of plus or minus 2000 degrees per second a yaw accuracy of 0.3 degrees in real time and 0.1.5 degrees through post-processing in dji terra this is the accuracy to 1 sigma or 68 a pitch and roll accuracy in real time of 0.05 degrees and 0.025 degrees through post-processing in dji terra again this is to an accuracy of one sigma or 68 the auxiliary positioning vision sensor holds a resolution of 1280 by 960 with a field of view of 95 degrees this is not used for data capture purposes so high resolution is not required the rgb mapping camera situated on the base of the zimu cell 1 is the equivalent to the specification of the phantom 4 rtk the one inch sensor holds an effective 20 megapixels allowing for the following variations of high resolution image collection with different aspect ratios 5472 by 3078 pixels in a 16x9 aspect ratio 4864 by 3648 pixels in a four by three aspect ratio 5472 by 3648 pixels in a three by two aspect ratio as a one inch sensor size the rgb camera on the l1 holds 8.8 focal length however this is equivalent to a 24 millimeter focal length in relation to a full frame sensor the adjustable iso range allows for a level between 100 and 3200 when in automatic mode for both photo and video when in manual mode this increases to 6400 for video and 12 800 for photo the sensor has an aperture range of f 2.8 to f11 for image storage the sensor supports the standardized fat file systems for data output the sensor records images in jpeg only in videos in mov and mp4 unlike many lidars the zmu cell one operates on a stabilized gimbal system allowing for a three axis movement tilting forward and backward roll around its axis and pan from left to right the gimbal itself has an angular vibration of 0.01 degrees and is attached to matrices 300 via detachable sky pot when mounted to the aircraft and in flight the axis allows for tilt range from -120 degrees through to positive 30 degrees and a pan of positive 320 degrees something that is unique to the l1 in different operating modes the gimbal can be used in follow and free mode when using the xmu cell 1 for our data capture it will produce a series of files all stored in one folder the folder contains files relating to the rgb photos imu point cloud data gnss observations and calibration files we will provide more details on the different files later in the course as a result of the amount of data captured and in particular the raw lidar the zemucel one requires a certain specification of sd card in order for the system to arrive quick enough if the sd card is too slow then your data will not be captured as such dji recommends a micro sd with a sequential writing speed of 50 megabytes per second or above and a uhs 1 speed grid 3 written or above the max capacity of the said sd card will be 256 gigabytes [Music] dji also recommends the following sd cards sandisk extreme 16 gigabytes to 128 gigabyte uhs one speed grade three lexar 1066x 128 gigabyte u3 and the samsung evo plus 128 gigabyte finally the xmu cell 1 data fundamentally requires processing before it can be interpreted therefore your data will need to be processed through dgi terror in order to obtain a point cloud once processed dgi tera can provide the following standardized formats pnts las ply pcd s3mb this brings us to the end of the first section of the l1 workflow course you should now be familiar with the sensor itself and the functionality available through the technical specification our next section will introduce you to the workflows that can be employed by this mucell1 in order to optimize the accuracies of your datasets [Music] you