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!
Remote sensing with Land Cover Classification
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LULC Classification and Ground Truthing
In this exercise, we are using imagery located at Pascagoula, MS, to digitize the land cover surrounding the area and classify it by land use and description.
In order to do this, I decided to use a land cover legend to digitize the different land types using a polygon feature class. The different land types were given different colors to differentiate the symbology of the land cover.
I then used 30 sample points called "truthing points" to test the accuracy of my land cover results. I simply dropped 30 points on my image and then exported them to google earth using a kmz tool. I then zoomed in on each sample point and viewed the google Earth Image in 3D to see fi my land cover was classified accurately or not. I then coded my results in my truthing feature class to identify which points were accurate and wh9icvh ones were not.
Close Up View Of one Sample Point
The final map below shows the sample points in accuracy in comparison to the classified Land Cover...
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...
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 - ...
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...
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