Creating a 3D line of sight analysis using ArcGIS Pro

in this video we will learn how to verify how to interrogate a line of sight using 3d in arcgis pro prepared an arcgis poll project in the project one can observe the city of haifa which is in the north of israel and within the city outlined red is a trail a walking trail that surrounds several buildings portrayed in blue and in orange and within this path this trail there is a tower noted by orange color and on top of that tower stands a man a person here noted in in green and this person would like to inspect would like to examine the path along this trail and more importantly the visibility the line of sight from his location to every single point or location along this red path this red line the way to do that is by several steps first we need a dem a digital elevation model in this demonstration we are going to use the srtm dem second we will need buildings a feature class of buildings with z coordinates we will also use buildings as multi-patch feature classes which will demonstrate the blocking in buildings we will need the path of the trail the one that that was outlined in red the observer point the one that was painted in green and we will do that within a model builder a schema which will include two two different tools the first will be construct site lines and the second will be line of sight both of them are located within the 3d analyst toolset going back to the project this is the 2d representation of the project and if we will create a 3d representation using a scene map we will be able to see the region the area in which in which we are interrogating in red this is the path or the trail within the buildings several 3d buildings in orange multi-patch buildings in blue and somewhere within the the area delineated by the red train is a turret located and on top of that turret a man is standing represented by designated by a green point and this man would like to inspect we would like to interrogate the visibility the line of sight to every location or every point along that trail what we use in this in this demonstration is the the srt the srtm um digital elevation model seen here this this is a representation of the topographic area of the caramel and i will select the world topographic map which is much better like this and this is the observer location over here the trail over here and the two buildings the multi-patch buildings and the three big 3d feature class buildings all of these buildings are located are attributed with elevation above an absolute height of the surface for instance the observer at elevation which is at an absolute height in accordance to the geometry a z value this elevation property will be attributed to each of our feature classes that is for the trail the building multi-patch and the building 3d feature classes in order to implement this process first we will open a new model builder canvas like this over here we will go first to the environment variable and make sure that the database that includes um this the results of this process will be a line site and then you will make sure that the srtm is the dominating layer in which every result or sub result will be defined by that is let's go to properties and let's call this model um [Music] demo demo site line and then demo site line we will leave the rest of the the quality options as is ok and save that were the preliminary steps now what we're trying to do is to add 3d tools in order to implement the desired project the desired process let's go to toolbars toolbox 3d analyst tools we are looking for the visibility tool set and within the visit this visibility there are two two two different tools the one the first construct sight lines while the second construct the line of sight we will observe the the differences between those two when we will have when we will derive our results let's use this one this tool first construct site of lines once the tool was was added let's define the inputs first i'm using the observer points second the target features will be the trail feature the output and site i will call the the output line side this we will use the z values the shape z of both um feature classes in order to derive the lines join um no join field it does it it's not required and note please the sampling distance i would like the sample example to take place every 100 meters meaning that within an interval of every um 100 meters the sampling method can be 3d or 2d it's it's it's of no relevance um when we are dealing with with local study areas this is the first one construct line of site let's rename the sub result to output lines like that like this let's organize a little bit that how to fit and let's add the second tool second tool will be site of lines like this double click the input surface we are using the dem surface in order to find whether the surface blocks or eliminates site of line we will use the srtm surface the input line features will be output lines and input features will be features that might block the line of sight of the observer to the target and we are using the building's multi-patch layer as our as our input the output let's call it another out output line side like this and then we would like to get also the observer the the blocking observer points meaning that we will name it output oops points okay let's how to arrange it fit to window save and that's it our model is ready validation and for validation we would like to add it to the display because we would like we would like the results to be shown right after the process is run and we are running the process once the process is done let's see the results the results showing here first of all these purple lines are the results of the first tool the construct sight lines meaning that it connects every location on the trail within an interval of 100 meters to the observer to the observer location like that this is the preliminary stage second stage which is built on these lines is the construction of line of sight and at in the results we we are able to see two types or two colors of lines the lines that are marked in green or the segment of line that are marked in green are segments um representing areas which are observable to the person that stands on this tower the locations or the segments that are portrayed in red are locations where the the site is blocked from the observer for instance look at this two segments note note that blocking the block blocking the sight line can be either by the topography represented by the dem or by multi-patch layers presented here in in blue if you would like to see the locations where the block the blocking occurs we will highlight the output ops point let's symbolize them in a better color and size like this and now it is much more clearer where are the locations along the path which are visible to the observer for instance these locations along this path over here where is the locations that are blocked from the observer just close to the path for instance here where are the locations that are blocked to the observer and present a long long segment which is unvisible and where are the locations over here which are blocked or the region which are blocked by blocking by other buildings or artificial monuments or structures one last thing to be noted is the table the attribute table of the site lines it has several it has several fields the first field source id is the object id of the source layer meaning that of the output lines the second list code is the one that presents visibility one is visible two is not visible the third talves represents whether the target is visible for instance in this this one this original line not noted by the object id2 is split into two the first one it has a segment which is visible and the the second has a segment which is not visible both of them cannot see the target meaning that the trail on the path the ops the ops dr mpid is a field that designates whether the blocking is by topography meaning that -111 or is visible noted by minus nine nine nine and within locations where our buildings are blocking the line of sight for instance here the object id of the blocking structure is noted in this field for instance let's drag it a little bit up here and we are able to see the lines that are blocked by the the blue feature which has an object id of one

Channel: Motti Zohar

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Id: d535sIBAuHU

Length: 18min 46sec (1126 seconds)

Published: Sun Apr 18 2021