Jinwook's UAS Blog

 I learned how to apply the concepts of buffering and overlay, two common cartographic operations. Buffering and overlay are two of the most common operations in cartographic modeling. A buffer zone is an area that is within a given distance from a map feature. When I buffered on a set of features, the output is a set of polygons. (Buffering points or lines creates a new polygon layer). Some softwares identify inside and outside regions, while others (like ArcGIS) identify the inside region. Regions are typically distinguished by different codes in an attribute table. MN Lake and Road Buffers MN areas Private land MN areas for campgrounds

Tables operations in ArcGIS provided more practice with tabular data management in ArcGIS. In this Lab, I learned how to view, select, re-order, and update tabular data. Most spatial data in a GIS consist of at least two types of data: those data depicting the location and shape of objects, and text or numerical data describing the objects. These text and numerical data are most often contained in tables, and most GIS packages have some way of creating and editing these data tables. ArcGIS - provides a rich set of tools for viewing and displaying attribute data. However, I didn’t have as many options for manipulating and saving table data, as with a full-featured database manager, so I did some rather simple operations in this lab. Older County Population Density US counties MED AGE of US counites Burglary VacRATES Cow Density Macon county

Digital data and basic table operations introduced digital data downloads with a few examples, basic selection by locations, and basic table operations. Most GIS store attribute data in tables. Each feature in a data layers is associated with a row in a table. I could select data manually from the geographic features or via the tables. I could also add or remove table columns and calculate values into columns. 1) a Kodiak Island map using online and downloaded data 2) a population density map from a census data set, with subset cities from a US data set 3) a proportional symbol map of county population for the lower 48 U.S. states 4) a shaded relief/hydrography map 5) a map of wetlands by size class

 Topology specifies the spatial relationships, or constraints, among features in a layer and among features in different layers. I needed to learn topological relationships by learning a list of topology rules, validating them against data, and editing to remove the topological errors found by the validation. This website was helpful in learning the topology rules. Geodatabase topology rules and fixes for polygon features—ArcGIS Pro | Documentation Must Be Larger Than Cluster tolerance Must Not Overlap Must Not Have Gaps Must Not Overlap With Must Be Covered By Feature Class Of Must Cover Each Other Must Be Covered By Boundary Must Be Covered By Area Boundary Must Be Covered By Boundary Of Contains Point This information was really helpful in making my own map, and this is my map and rule chart before building. Before builidng Rule charts

I learned two basic digitizing techniques using ArcGIS Pro. I Digitized converts image data to vector digital data. In manual digitizing I traced the  lines or points from the source media. I sampled vertices using the mouse to define  the point, line, or polygonal features I wished to capture.   I digitized and edited features from a scanned photo. GIS data are commonly  entered from images because methods for creating geometrically accurate images have  become relatively inexpensive over the past two decades, and we can easily adjust the  display scale, zooming in or out as needed. This often reduces both interpretation and  digitizing errors. 

 I completed a tutorial created by ESRI that is designed to introduce imagery and Remotely sensed data. This tutorial was a refresher from last semester. 1. introduction 2. image properites 3. seeing beyond the visible 4. imagery in ArcGIS pro

Orthomosaic, DSM, DEM DSM stands for digital surface model and DEM stands for digital elevation model.  The main difference lies in the content I captured. DSMs include all surface features (both natural and artificial), while DEMs specifically focus on representing the elevation of the bare Earth's surface, When using the swipe tool to compare orthomosaic and DSM, I could notice how the orthomosaic aligns with the underlying terrain features depicted in the shaded relief of the DSM.  The orthomosaic and the shaded relief of the DSM provide different perspectives of the same area. The orthomosaic will show the actual visual appearance of the landscape, including objects, buildings, roads, etc., while the DSM shaded relief will reveal the underlying elevation variations that influence the terrain's appearance in the orthomosaic. Building the map with UAS data  I made three types of the map(shaded DSM with transparent DSM on top, orthomosaic map and orthomosaic map with a ...