2 - Build the Newport DEM

Build the Newport DEM¶

Now we will build our main workshop DEM for Newport, Oregon.

The recipe is simple:

reusable national coastal data
            +
local Newport topobathymetric lidar
            ↓
      Newport coastal DEM

We will start the build here and let it run while we move into Module 2b — Inside the Workflow.

1. Newport study area¶

Our study area includes Yaquina Bay, the entrance channel, nearby coastal waters, and adjacent topography.

For this workshop, we will build a 1/9-arc-second DEM using:

• Bounds: -124.10/-124.00/44.59/44.64

• Horizontal CRS: NAD83 geographic (EPSG:4269)

• Vertical CRS: NAVD88 height (EPSG:5703)

• Combined reference system: epsg:4269+5703

2. Start with a national recipe, then add local data¶

Our reusable national starting recipe is:

coupling-bathy-topo

It combines nationally available coastal elevation sources into a starting point that we can improve with appropriate local data.

For Newport, our question is:

Is there a useful local dataset that would improve the national recipe?

What is in coupling-bathy-topo?¶

coupling-bathy-topo is a reusable recipe that combines several nationally available topographic and bathymetric data sources.

The exact sources used depend on what data are available in the study area.

To inspect the bundle, run:

fetchez modules bundles info coupling-bathy-topo

We will look more closely at how these sources move through the workflow in Module 2b — Inside the Workflow.

3. Find Newport topobathymetric lidar¶

NOAA’s Digital Coast Data Access Viewer (DAV) lets us search geographically for coastal lidar.

Open NOAA Digital Coast DAV for Newport

Find the dataset ID¶

Globato/Fetchez needs the numeric DAV dataset ID.

In the dataset details:

1. Scroll to Bulk Download.

2. Click Link to All Dataset Files.

3. Look at the URL of the page that opens.

Near the end of the URL, you will see:

.../####/index.html
     ↑
 DAV dataset ID

Use that number in:

dav:survey_id=####,weight=100

9693

dav:survey_id=9693,weight=100

4. Build the Newport DEM¶

We now have the two main data ingredients:

coupling-bathy-topo
        +
dav:survey_id=9693,weight=100

Start with strong nationally available data, then add local scientific data when it improves the DEM.

Run:

globato build \
  -R -124.10/-124.00/44.59/44.64 \
  -X 6:5 \
  -P epsg:4269+5703 \
  -E 0.1111111s \
  -O newport \
  -D ~/workshop/newport_dem \
  --shared-cache ~/workshop/newport_data \
  coupling-bathy-topo \
  dav:survey_id=9693,weight=100

bash ~/shared/setup_workshop.sh

ls ~/workshop

Continue while Newport builds¶

Keep the Newport terminal running and move to:

Module 2b — Inside the Workflow

There we will connect the messages appearing in the terminal to the major processing stages.