Welcome! This is my portfolio blog site displaying the different types of data analysis and geospatial tools that I use as a Geospatial Analyst.
Please feel free to provide comments and feedback to working projects!
Coastal Flooding & Storm Surge Analysis in GIS
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What is Coastal Flooding?
Why use GIS to determine damage to infrastructure?
By using GIS and Remote sensing Applications, we can determine how much damage a specific area received in regards to natural disasters.
An example would be hurricanes, tornados, and even tsunamis. For this exercise, a coastal flooding analysis was calculated to show the before area and the aftermath of the Hurricane Sandy storm that plowed through New Jersey.
We were able to calculate using elevation data taken from LIDAR to determine changes in elevation. In the map below, the areas depicted in red are where massive elevation changes have occurred such as erosion or destruction after the storm. The areas in dark blue indicate sand accretion or building debris.
Insurance companies can use maps like these to determine how many claims they will be processing after a major hurricane. We can also determine the level of damage, and what areas were affected the most.
Lidar DEM - Collected from LAS Point Cloud Data
USGS DEM - Collected by the U.S. G. S. Survey for elevation and terrain modeling
Storm Surge In Florida
This map bellows demonstrates using two different elevation models (DEM's from LIDAR and USGS) to determine a prediction of how many buildings might be affected in a certain area due to storm surge. Storm surge is similar to coastal flooding in which the sea level rises due to an incoming storm, such as a hurricane or tsunami, and the sea level will reach a certain height above the ground floor. The map indicates the differences in using a 1 meter storm surge to see how many buildings will be affected in Naples, Florida along the coast. As you can see, the USGS DEM has a higher number of buildings being affected than the LIDAR DEM.
In future testing, some hurricanes can reach up to 12 meters in a storm surge for storms that equate to a level 5 category hurricane.
It would be a great idea to test multiple storm surge levels such as 3 meters, 8 meters, or even anything over 10 to see how much infrastructure can be affected by the storm.
This helps policy makers plan for natural disasters such as hurricanes along the coast.
Elevation Models For GIS Today we are going to run through some analysis of comparing Digital Elevation Models (DEM's) to Triangular Irregular Networks (TIN's) using Arc GIS Pro. One of the main differences between TIN's and DEM's, is that a DEM file is raster based, whereas a TIN elevation model is vector based. In GIS, we can use TIN's and DEM's to analyze elevation of local areas or global even to conduct slope analysis, aspect ratio, terrain mapping, and solve complex problems. Using a DEM to Develop a Ski Run Suitability Map In the example below, we are identifying where an engineering firm would place a ski run for a resort in an area based on elevation, slope, and aspect parameters. We used the weighted overlay tool to combine 3 reclassified rasters of elevation at a high altitude, slope at a high pitch, and aspect for a SW positioning with given percentages of weight. 25% aspect 40% elevation 35% slope This was our result: As you can see, we c...
Isarithmic Mapping Today we are going to talk about Isarithmic Mapping! This type of mapping is a way to explain smooth or continuous phenomenon such as a heat map, weather, temperature or rainfall. There are two types of these kind of maps, Isopleth and Isometric . .. Isopleth Maps : These are made from perceptual poi nt data such as the population of an area or the rate of crime in an area. These maps should be normalized if using raw data and should come from averages, densities, and ways to standardize the data. Such as the number of Covid cases per every 10,000 people, rather than coloring polygons of counties based on the number of covid cases. Isometric Maps : These come from true point data, such as crime locations as points at a certain address or X and Y coordinate The two rainfall maps of Washington below are Isopleth maps as they are using perceptual data of areas regarding their average rainfall in the state of Washington. This data is already standardi...
Hello everyone! Today I decided to experiment with a completely new color scheme for my mapping lab assignment. I went with purple! I am not sure why, but it just seemed right at the time... The map above is unique as today we are going to focus on our main talking points staying within the realm of Cartography. In particular, we are going to talk about Visual Hierarchy, and the map making process following Gestalt's Principles. As a GIS analyst, we must look at making maps and visuals as a graphic design process as well as a scientific process. This means that maps need to have a theme, a feel, and most importantly provide context to the map reader in a way that makes sense. Before we dive into the map above, lets explain what visual hierarchy is and the Gestalt Principles! Gestalt's Theory is as humans, we see or perceive the whole of something before we actually make out the individual parts. When you see a landscape, you see the landscape first, then the ...
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