GIS5100 - Module 2 - Forestry and LiDAR

                In this module, we learned how LiDAR is being used by by forester to understand the forest canopy and terrain. The .las file we downloaded from Virginia Graphic Information Network was decompressed and used to create Digital Elevation Models, Digital Surface Model, and to calculate forest height. LiDAR is important for forester  to conduct biomass analysis, classify terrain, plan forest management, and identify drainage pattern. Below is the steps I used to finish this lab. 

               First, I downloaded the .laz file from Virginia LiDAR for Tile Name: N16_5807_20. Then I converted the .laz file into a LAS file. Then, I inserted a new local scene and a topographic map. Next, I ran the point file information tool with the provided parameters. After, I changed the filter of the LiDAR layer to Ground. Next, I used the LAS Dataset to Raster tool with the provided parameters to make a DEM. I repeat the previous two step but changing the LAS Points to non-ground to make the DSM layer. I then subtracted the DSM from the DEM using the Minus Tool. 

               Next, I ran the LAS to MultiPoint tool using the .las file to make the bare earth Ground_Multi layer. I repeat the same step above for Vegetation_Multi but change the class code to 1. Then, I created two raster files with the previous multipoint files. Next, I made two IS NULL raster files. Then, I generated two Count_Ground/Vegetation files using the Con tool. Next, I combined the Count_Ground/Vegetation tool using the plus tool and then converted the result into a float. Then I used the Divide tool to generate the canopy density using the float result and count_vegetation. I then selected a color ramp symbology where red is low density and green is high density. Next, I created a histogram of the height layer. 

                The hardest part for me was using the CON tool. I thought we had to use an SQL Query to select a value of 0. That took me down a rabbit hole of generating the wrong value for the CanopyDensity. Luckily, I was able to redo the steps and post onto the discussion board in hopes of helping other who runs into the same issue. Another issue I had with making the maps was the LiDAR scene not fully processing in the layout tab. I had to resort to taking a screenshot of the local LiDAR scene and pasting it into my layout. Due to not being able to use the LiDAR scene for my layout, I was not able to add a scale bar for the LiDAR Map. 


                

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