Table of Contents
- Tracking Creatures of Bavarian Folklore Using a Least-Cost Path Model
- Setting up Your Workspace
- Preparing the Data
- Skill Drill: Geocoding an Address and Creating a CSV Table to Import As XY Data
- Skill Drill: Defining the Study Area
- Skill Drill: Acquire Elevation Data from the USGS National Map Viewer
- Skill Drill: Acquire Land Cover Data from the USGS National Map Viewer
- Skill Drill: Acquire Hydrography Data from the USGS National Map Viewer
- Changing Global Environment Settings for
- Creating Cost Surface Models Using a Relative Cost Scale
- Creating a Remap Table to Reclassify Elevation
- Skill Drill: Creating a Remap Table to Reclassify Slope
- Skill Drill: Creating a Remap Table to Reclassify Tree Canopy Density
- Converting the Hydrography Features to Cost Surface Models
- Creating a Total Cost Surface Model
- Creating a Cost-Distance Surface Model
- Creating a Migration Corridor
- Determining the Least-Cost Path
- Skill Drill: Creating a Map of the Results
Skill Drill: Acquire Hydrography Data from the USGS National Map Viewer
To complete the least-cost path analysis, you will also need a layer representing waterbodies. Return to the USGS National Map Viewer. Use the same methods in the previous skill drill to locate the National Hydrography Dataset under the Datasets tab.
From time to time, the National Map Viewer fails to work properly when downloading certain datasets, such as the NHD. Please inform your instructor of any problems so that an alternative solution can be posted to the class. Check the box next to Hydrography (NHD) and Watersheds. Under Product Search Filter, select the National Hydrography Dataset (NHD) Best Resolution. Under Data Extent, select HU-4 Subregion. Under File Format select Shapefile. Then click Find Products.
On the Products tab, you will see a list of datasets available for download. To determine which dataset covers the area of interest, you can click on the Footprint link to see the boundary of the dataset. Once you have found a dataset that includes the region of interest, click the Download link. Save the file in your original folder and decompress it.
In ArcMap, add the following three shapefiles:
- NHD Flowline
- NHD Area
- NHD Waterbody
Together, these three shapefiles will represent cost factors related to traveling across water. To understand more about how this data was derived, you can read the metadata using the link provided by the USGS National Map Viewer. Use the Project tool to create copies of the data with the NAD 83 UTM Zone 10N spatial reference. Save the new files to your working folder. You will not need to clip the hydrography layers at this time. Instead, you will use another method to limit the geographic extent of the water features later on.