Module 1.3: Data Quality - Assessment

 


The objective of this assignment is to learn how to assess the quality of road networks. Specifically, we evaluate the completeness of road networks by comparing the total length of roads across two different datasets: the county Street-Centerlines and the TIGER road network. By examining differences in road lengths at both the county and grid levels, we can identify spatial gaps and better understand the relative coverage of each dataset.

To perform the analysis, all datasets were first projected into a common coordinate system to ensure accurate distance measurements. Both road networks were clipped to the study area and intersected with grid polygons, splitting road segments at grid boundaries and assigning them to their respective grid cells. Lengths were recalculated for each segment, and total road lengths were summarized per grid for both datasets. Percent differences were then calculated using the county Street-Centerlines as the base, where positive values indicate Street-Centerlines are more complete, and negative values indicate TIGER roads are longer.

The results were visualized using a choropleth map with a diverging color ramp. Positive and negative differences were highlighted in green and red, respectively. This visualization communicates spatial patterns of road completeness across the county.

Comments

Post a Comment

Popular posts from this blog

Module 1- Overview of ArcGIS

Image
This week was a good intro to the program and a good start to getting used to how the system works. It will just take more practice to get used to where things are and what they do.  
Read more

Module 5: Data Points and Geocoding

  Manatee County Schools - Overview      Here is the Link to my map for this week.      The map this week is the locations of all the schools located in Manatee County, Florida. It contains information such as the coordinates, addresses, and names of the schools. Schools of all grade type are on the map. I.E elementary through college.         This weeks experience was different because we got to use Excel and partially collecting our own data from different sites. This week felt a little easier, because I have experience with Excel and I enjoy getting to use it for new things. It was nice having the labs feel a little shorter, but still learning just as much. It was easier to manage, and understand, without the potential to feel overwhelming, which I enjoyed. I didn't run into any issues in these labs, everything ran smooth.
Read more

Module 6: Georeferencing, Editing, & 3D.

Image
  This map is a georeference of three different raster images of the UWF Campus in Pensacola, Florida. The map also includes the location of a Bald Eagle nest that was found by the FWC, and the subsequent easement that was created around the nest to protect it from harm. This week's experience was pretty fun! I really enjoyed georeferencing. Matching the older pictures of the campus with the modern day map was a cool experience. Setting up control points on the map was pretty straight forward, and I felt pretty confident following the steps and indicators. I found editing the map features interesting because it was a way to add more information to show certain characteristics that need to be highlighted. Working on the 3D map was fun because it showed me a more realistic view of what the area actually looks like, which I enjoy more than the generalized maps that we have looked at previously. The following map is a georeferenced of the UWF Campus as well, on 3D scene:
Read more