Advanced GIS Lab5
Advanced GIS Lab5
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Objectives
Objectives
Download multiple elevation data (Lidar, Autocorrelated, and NED)
Display DEMs using tools (Mosaic to new raster, Project Raster, and Hill shade)
Conducting Raster Manipulations (Slope, Zonal Statistic, Clips, and Reclassify)
Lab5_96.pdfIntroduction
Introduction
In this Lab, I conducted downloading multiple elevation data, manipulating, and displaying data. The study area is Big Cottonwood Canyon Watershed, Salt Lake City, UT. To complete the task, I identified DEMs in a various, highlighted differences of each DEMs, and reclassified for calculation of Raster file. I conducted this study by ArcMap 10.7.1 and the coordinate system, NAD 1983 UTM Zone 12N is used.
Methods
Methods
In this lab, three tasks were conducted. First, I downloaded DEMs including Lidar, Autocorrelated, and National Elevation Dataset (NED). Second, modified each DEMs by using the Mosaic to New Raster tool (2-meter and 5-meter DEMs) and the Project Raster tool (10-meter NED DEMs). Third, I used the Zonal statistic Table tool to calculate the mean slope. Also, I reclassified the clipped NED DEM file to figure out over 2500-meter elevations in the raster file.
Result & Discussion
Result & Discussion
I could employ multiple and display digital elevation models in this lab. During task 1, although 2-meter and 5-meter DEMs should do the Mosaic to New Raster tool, 10-meter NED DEMs from the USGS do not need mosaicking. According to the instruction, it is only available for Utah. During task 3, I made mistakes regarding reclassification and figured out the reason. The reason why I selected too broad range when I reclassified. For instance, I included 2488.555 as 2500 because I thought it can be rounded as 2500. Now I understand. Next time I will be careful about this issue.
References
References
1) 2-meter Lidar DEMs from AGRC (http://gis.utah.gov/data/)
2) 5-meter Autocorrelated DEMs from AGRC (http://gis.utah.gov/data/)
3) 10-meter NED from the USGS (https://www.usgs.gov/core-science-systems/ngp/3dep)
4) ws_aoi (UT AGRC, Lab05 of WATS 6920 course, USU)
5) ned_10m_slc (Lab05 of WATS 6920 course, USU)
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